WO2001025363A1 - Film de protection de surface et lamine a base de ce film - Google Patents
Film de protection de surface et lamine a base de ce film Download PDFInfo
- Publication number
- WO2001025363A1 WO2001025363A1 PCT/JP2000/006713 JP0006713W WO0125363A1 WO 2001025363 A1 WO2001025363 A1 WO 2001025363A1 JP 0006713 W JP0006713 W JP 0006713W WO 0125363 A1 WO0125363 A1 WO 0125363A1
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- WO
- WIPO (PCT)
- Prior art keywords
- film
- adhesive layer
- protective film
- sensitive adhesive
- pressure
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
- C09J7/25—Plastics; Metallised plastics based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/255—Polyesters
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2400/00—Presence of inorganic and organic materials
- C09J2400/10—Presence of inorganic materials
- C09J2400/16—Metal
- C09J2400/163—Metal in the substrate
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/906—Roll or coil
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/918—Material abnormally transparent
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/14—Layer or component removable to expose adhesive
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/14—Layer or component removable to expose adhesive
- Y10T428/1405—Capsule or particulate matter containing [e.g., sphere, flake, microballoon, etc.]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/14—Layer or component removable to expose adhesive
- Y10T428/1419—Wax containing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/14—Layer or component removable to expose adhesive
- Y10T428/1452—Polymer derived only from ethylenically unsaturated monomer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/14—Layer or component removable to expose adhesive
- Y10T428/1452—Polymer derived only from ethylenically unsaturated monomer
- Y10T428/1457—Silicon
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/14—Layer or component removable to expose adhesive
- Y10T428/1462—Polymer derived from material having at least one acrylic or alkacrylic group or the nitrile or amide derivative thereof [e.g., acrylamide, acrylate ester, etc.]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/14—Layer or component removable to expose adhesive
- Y10T428/1471—Protective layer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/14—Layer or component removable to expose adhesive
- Y10T428/1476—Release layer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31786—Of polyester [e.g., alkyd, etc.]
Definitions
- the present invention relates to a surface protection film, and more specifically, peels off lightly after bonding to a mating base material, and does not increase the peeling force even after aging, and bonds to a mating base material having a rough surface.
- the present invention also relates to a surface protective film having a pressure-sensitive adhesive layer that does not cause lifting due to the incorporation of air bubbles and the like when the material is bonded, and that is highly transparent and does not impair the testability of the bonded base material.
- the surface protection film generally has a configuration in which a plastic film is used as a base film, and an adhesive layer is provided on one surface of the base film.
- a plastic film is used as a base film, and an adhesive layer is provided on one surface of the base film.
- an adhesive layer is provided on one surface of the base film.
- its use for surface protection of optical components has been increasing.
- it is used for surface protection in the manufacture of various displays such as televisions, convenience stores, word processors and car navigation systems.
- LCDs liquid crystal display panels
- It is used to protect the surface of optical components and optical laminates such as polarizing plates, retardation plates and viewing angle widening films during the manufacturing process.
- a transparent olefin-based film such as polyethylene / polypropylene is used as a base film of the surface protective film, and these films are used after manufacturing and assembling of a liquid crystal display and the like, and in actual use.
- the surface protection film is peeled off and removed.
- TFT-type liquid crystal displays have received special attention due to their high definition and high responsiveness, and the demand for surface protective films during their production has become strict.
- the product is often inspected for defects while the surface protective film is attached.
- the base film is made of a olefin-based material such as polyethylene film.
- the transparency is poor and there are many gels such as fish eyes. Therefore, it becomes difficult to inspect the product itself with high accuracy.
- the surface protective film is applied to a polarizing plate, a liquid crystal display, or the like, it often remains applied for a long time until the next manufacturing process. After the inspection, etc., if the peeling force increases when the film is peeled off, the workability may deteriorate, or a part of the adhesive of the film may remain. There were problems that occurred.
- the pressure-sensitive adhesive layer of the surface protective film has a low adhesive strength and has removability.For example, it increases the cohesive strength of the pressure-sensitive adhesive, a component having a high glass transition temperature (Tg), or a hard component.
- Tg glass transition temperature
- a method of hardening the pressure-sensitive adhesive layer by including a large number of segments is employed. Therefore, when a surface protective film having such an adhesive layer is bonded to a mating substrate such as a polarizing plate having irregularities on the surface, the adhesive of the surface protective film does not spread sufficiently on the irregularities.
- the release film is generally used on the surface of the pressure-sensitive adhesive layer of the surface protective film before use in the manufacturing process for forming the pressure-sensitive adhesive layer, and is wound up as it is to be a product.
- the release film is simply peeled off and discarded, and it is necessary to eliminate the release film in terms of waste generation and cost.
- An object of the present invention is to solve the problems of the prior art which is strong, to peel off lightly after bonding to a mating substrate, and to have a high peeling force even after aging, and to have a rough surface. It has a pressure-sensitive adhesive layer that does not cause lifting due to the incorporation of air bubbles and the like when bonded to the mating substrate, and a highly transparent surface protection film that does not impair the testability of the mating mating substrate. To provide.
- Another object of the present invention is to provide a pressure-sensitive adhesive layer having no adhesive residue,
- An object of the present invention is to provide a surface protective film having a surface.
- Still another object of the present invention is that the surface protective film can be wound into a roll without being bonded to the adhesive layer of the surface protective film, and the surface of the adhesive layer of the surface protective film unwound from the roll can be used as a base material. It can be peeled lightly as needed even when bonded to a material, and the peeling force does not increase even after aging, and it is highly transparent and does not impair the testability of the bonded mating substrate.
- An object of the present invention is to provide a film roll wound with a surface protection film.
- the above objects and advantages of the present invention include, first, a polyester film (A) and an adhesive layer (B) on one side of a polyester film (A), and a critical restitution coefficient of 0. Achieved by a surface protection film for protecting the surface of the substrate, which is not more than 5.
- the surface protective film preferably has the following properties and configuration.
- the pressure-sensitive adhesive layer (B) satisfies all of the following characteristics (1) to (4).
- the rate of change of normal adhesive strength after maintaining at 60 ° C for 1 week is 0.5 times or more.
- the pole size in ball tack measurement is 2Z3 2 inches to 10/3 2 inches.
- the thickness of the pressure-sensitive adhesive layer (B) is 5 m to 50 m.
- a film roll in the form of a roll on which the surface protective film of the present invention is wound in a state where the pressure-sensitive adhesive layer (B) and the protective layer (C) are in direct contact with each other.
- the surface protective film of the present invention comprises at least a polyester film (A) It consists of an adhesive layer (B). Further, a protective layer (C) containing at least one of an antistatic agent and a release agent can be provided on the surface opposite to the adhesive layer. Further, a release layer (E) can be provided on the pressure-sensitive adhesive layer (B).
- a polyester film having excellent transparency, productivity, and processability is used as the base film (layer A) of the surface protective film.
- the polyester film is not particularly limited, but is preferably a polyethylene terephthalate film or a polyethylene-2,6-naphthalenedicarboxylate film. Further, in the configuration, a multilayer structure having an arbitrary number of layers by co-extrusion may be employed.
- the polyester constituting such a polyester film is preferably a crystalline linear saturated polyester comprising an aromatic dibasic acid component and a diol component, such as polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, and the like.
- a diol component such as polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, and the like.
- Polyethylene-1,2,6-naphthalenedicarboxylate and the like can be mentioned. Further, it may be a copolymer in which some of them are substituted by other components, or a mixture with polyalkylene glycol or another resin.
- the polyester film used in the present invention may be unstretched, uniaxially oriented, or biaxially oriented. Preferably, it is a biaxially oriented polyester film from the viewpoint of productivity and handleability.
- the biaxially oriented polyester film can be produced by a conventionally known method such as a sequential biaxial stretching method and a simultaneous biaxial stretching method.
- the sequential biaxial stretching method can be performed by the following method.
- a die for example, T_ die, I-die, etc.
- an unstretched film or co-extruded unstretched film is formed.
- the unstretched film is stretched in the machine direction at a temperature of 60 to 140 ° C., and then stretched in a transverse direction at a temperature of 80 to 150 ° C. It can be manufactured by heat setting at a temperature of up to 260 ° C. for 1 to 100 seconds.
- the heat-setting may be performed under limited shrinkage.
- the biaxially oriented polyester film (A) is preferably isotropic in order not to cause breakage in a specific direction, and has a refractive index in the transverse direction (N TD ) and a refractive index in the longitudinal direction (N It is preferable that the difference (N TD —N MD ) from ( MD ) to ( ⁇ TD) be more than ⁇ 0.08 and less than ⁇ 0.08.
- the vertical direction refers to the direction along the film forming direction
- the horizontal direction refers to the direction perpendicular to the vertical direction and the thickness direction of the film
- the horizontal direction refers to the width direction below. There is also.
- N TD -N MD refractive index in the vertical direction
- the above-mentioned stretching ratio in the longitudinal direction and the transverse direction may be made the same as much as possible, and the stretching ratio in the longitudinal direction and the transverse direction may be 2 to 5 times, particularly 2.5 to 4 times. The range is preferably 5 times.
- the uniaxially oriented polyester film can be produced by the method described above, in which the film is stretched only in the vertical direction or only in the horizontal direction.
- the thickness of the film is not particularly limited, but is preferably 5 to 500. More preferably, it is preferably from 100 to 200 Aim in order to improve workability such as bonding and productivity.
- Such a polyester film has a lubricating agent such as carbonated alumina, alumina, kaolin, silica, and titanium oxide in order to improve the slipperiness when the film is wound and the handling during processing such as application of an adhesive.
- a lubricating agent such as carbonated alumina, alumina, kaolin, silica, and titanium oxide
- inorganic fine particles such as barium sulfate, zeolite and the like, and organic fine particles such as silicone resin, cross-linked polystyrene and acrylic resin.
- silica particles such as spherical silica or porous silica.
- other additives such as a stabilizer, an ultraviolet absorber, a flame retardant, an antistatic agent and the like can be contained. Fine particles and additives
- Fine particles and additives There are no particular restrictions on the timing of addition of the polyester film, as long as it is a stage before the polyester film is formed. For example, it may be added at the polymerization stage, or
- the polyester film (A) in the present invention preferably has a center line average plane roughness (Ra) of 2 nm or more and 500 nm or less. If Ra is less than 2 nm, the film may be difficult to transport, such as being difficult to slide, during processing, and if it is greater than 5 O Onm, the transparency S deteriorates and the testability is deteriorated.
- Ra center line average plane roughness
- the pressure-sensitive adhesive layer (B) is provided by the transfer method, there is a concern that the adhesive layer (B) may not be uniformly adhered due to the unevenness of the polyester film (A).
- the polyester film (A) there is no foreign matter of 25 / m or more in a width of 210 mm on one side and a length of 148 mm on a side perpendicular to the side (area of 310.8 cm 2 ), and It is preferable that the number of foreign matters having a size of 5 to less than 25 m is 10 or less. If more than 25 foreign substances are present, a void or the like will be generated during application or transfer of the adhesive, and the adhesive will come off or swell up to the size or more, so that it can be visually confirmed. May cause local appearance defects. If there are more than 10 foreign particles having a size of 5 or more and less than 25 xm, the size is difficult to visually confirm, but the defect may be noticeable.
- the polyester film (A) in the present invention from the viewpoint of the inspection, where the index of refraction in the transverse direction (N TD) and the longitudinal direction of the refractive index difference between the (N MD) (N TD - N MD) is 0. It is preferably at least 08.
- the thickness of the polyester film (A) used in the present invention is 30 to 4 At 0 m, the retardation becomes sufficiently large and the density of the interference color is extremely reduced, so that the trouble of the visual inspection can be reduced. If N TD _N MD is less than 0.08, the letter determination is small and the interference color interferes with visual inspection.
- N TD -N MD is sometimes referred to as birefringence ( ⁇ ), and these ⁇ are preferably as large as possible for the above-mentioned reason, and are preferably 0.09 or more, and more preferably 0.10 or more. Particularly preferred.
- the upper limit of the stretching ratio in the longitudinal direction is less than 2.0 times, preferably less than 1.8 times, more preferably less than 1.6 times
- the lower limit of the stretching ratio in the longitudinal direction is preferably 1.1 times or more. Is at least 1.2 times, more preferably at least 1.3 times
- the lower limit of the transverse stretching magnification is at least 4.0 times, preferably at least 4.2 times, more preferably at least 4.4 times, and It can be produced by setting the upper limit of the stretching ratio in the transverse direction to 6.0 times or less, preferably 5.5 times or less, and more preferably 5.0 times or less.
- the polyester film (A) having N TD -N MD of 0.08 or more preferably has a longitudinal orientation degree (N MD ) of 1.550 or more. If the NMD is less than 1.550, the biaxially oriented film easily stretches in the longitudinal direction when the adhesive layer is protected by being bonded to a polarizing plate or the like via the adhesive layer, and is deformed. In some cases, air or the like may enter the area, or the biaxially oriented film may be excessively deformed when peeled from the protective adhesive layer, resulting in poor workability in the peeling step. For these reasons, the degree of vertical orientation (N MD ) of the biaxially oriented film is particularly preferred to be 1.580 or more.
- Adhesive layer (B) Adhesive layer (B)
- An adhesive layer is laminated on one side of (A). This adhesive is considered not only indoors but also to be left outdoors, and it must withstand various light rays during inspection, in particular, it needs to withstand ultraviolet rays. An acryl-based pressure-sensitive adhesive is preferred in order to prevent the migration of components to the mating substrate.
- Some liquid crystal display components such as polarizing plates, have fine irregularities on the surface to reduce the glare of the display, and the adhesive layer of the surface protective film spreads sufficiently on the irregular surfaces.
- the critical rebound coefficient is used as an index of the softness.
- the surface protective film of the present invention has a pressure-sensitive adhesive layer having a critical rebound coefficient of 0.5 or less. If the critical rebound coefficient is larger than 0.5, it means that the pressure-sensitive adhesive layer is too hard.
- the critical rebound coefficient is measured by adhering the pressure-sensitive adhesive layer of the surface protective film to a glass plate and dropping the iron ball freely from the opposite surface of the pressure-sensitive adhesive layer. Using iron balls of different diameters, measure the rebound coefficient of each, plot it against the cube of the iron ball diameter, and define the rebound coefficient when the diameter is extrapolated to zero.
- the thickness of the pressure-sensitive adhesive layer of such a surface protective film is preferably 3 m or more and 50 m or less, particularly preferably 5 m or more and 50 m or less.
- the adhesive is not sufficiently spread on the surface of the polarizing plate when it is bonded to an uneven polarizing plate due to the hardness of the polyester film which is the base film of the surface protection film.
- the required adhesive strength cannot be obtained, and when they are bonded together, they are likely to be partially lifted.
- the thickness is less than 5 m, the adhesive is sufficiently wetted and spread on the surface of the polarizing plate when it is bonded to an uneven polarizing plate due to the hardness of the polyester film which is the base film of the surface protection film.
- the required adhesive strength cannot be obtained, and in some cases, a partial lifting may occur when bonding, so that the thickness is particularly preferably 5 m or more. If the thickness is more than 50 m, the adhesive strength will be unnecessarily high, and when applying the adhesive, there will be problems in terms of thickness control, curing control, and cost.
- the normal adhesive strength of the adhesive layer to the stainless steel plate is 30 mNZ25 mm or more and 500 mNZ25 mm or more.
- the adhesive force lmNZ25mm is converted as 0.1 gZ25mm, 30 mN / 25 mm is 3 gZ25 mm, and 50 OmN is 5 gZ25mm. If the normal adhesive strength is less than 3 OmN / 25 mm, it is not preferable because the end turns may occur and the adhesive may be easily peeled off by any contact.
- the adhesive layer is stuck on a stainless steel plate and maintained at 60 ° C for one week. It is preferable that the rate of change of the normal adhesive strength after the heating to the normal adhesive strength before maintaining at 60 ° C. for one week is 0.5 times or more and 2.0 times or less. If the rate of change is less than 0.5 times or greater than 2.0 times, the setting and management become complicated when the surface protective layer is automatically peeled off, and if the rate of change is large, peeling becomes difficult.
- the normal adhesive strength in the present invention is expressed by a stainless steel plate. This is because the adhesive strength to a polarizing plate or the like is easily influenced by the surface and is difficult to evaluate, but is easy to evaluate. In addition, by setting the normal adhesive strength to the stainless steel plate and the rate of change thereof within the above ranges, a surface protective film having appropriate slight adhesiveness to a polarizing plate or the like and having no change in the peeling force can be obtained.
- the ball size is preferably 2Z32 inches or more and 10/32 inches or less in ball tack measurement. If it is less than 1 Z32 inches, there is little tackiness, so that when it is bonded to a mating substrate, it may be turned up or lifted. If the thickness is more than 1 13 2 inches, the tackiness will be high, the adhesive strength will be high, the adhesive itself will be too soft, the cohesive strength of the adhesive will decrease, and the adhesive will remain after peeling. May occur. After attaching the surface protection film to the mating substrate, it must be peeled off in the next manufacturing and assembling process and the final process, but if the adhesive remains without peeling, defects in the appearance of liquid crystal displays, etc. Will be.
- the deviation when the holding force is measured under the conditions of a load of lkg and a temperature of 80 is 0 to 1 mm after one hour.
- the deviation of the surface protection film after 1 hour under the conditions of a load of 1 kg and a temperature of 80 ° C in the holding force measurement is to prevent the surface protection film from shifting over time. It is preferably less than l mm. If the deviation is larger than 1 mm, the surface protective film is easily displaced with time after being attached to the mating substrate, which is not preferable in terms of work and inspection.
- the pressure-sensitive adhesive layer of the present invention on the stainless steel surface after being bonded to a stainless steel plate at 80 ° C. for one week, no adhesive residue having a size of l mm square or larger adheres to the stainless steel surface at a rate of 0 per 100 cm 2.
- there is. Affix the surface protection film to the mating substrate After peeling, it is necessary to peel it off in the next manufacturing and assembly process and the final process, but if the adhesive remains without peeling, it will be a defect in the appearance of the liquid crystal display etc. After bonding the protective film and maintaining the film at 80 ° C.
- the pressure-sensitive adhesive layer of the present invention preferably has the following properties.
- Glass transition temperature is not less than 60 ° C and not more than 20 ° C;
- 'Tensile modulus is not less than 0.2 IMP a and not more than 0.2 MPa;
- the surface tension is more than 15 AiNZcm and less than 25 ⁇ NZ cm;
- the glass transition temperature (Tg) of the pressure-sensitive adhesive layer is lower than -60 ° C, or if the tensile elasticity of the pressure-sensitive adhesive layer is lower than 0, IMPa, it can be extremely low even in a normal use environment such as room temperature. It is soft and spreads more than necessary on the bonded surface to be protected, and tends to have excessively high adhesion and poor releasability.
- the glass transition temperature of the pressure-sensitive adhesive layer exceeds 120 ° C or the tensile elasticity of the pressure-sensitive adhesive layer exceeds 0.2 MPa, it will not be soft under room temperature and other conditions, and it will be bonded together. It is difficult to fully wet and spread on the protected surface.
- the desired adhesive strength with the protected surface to be bonded cannot be obtained, while if it exceeds 25 NZcm, it is more than necessary between the surface and the protected surface. , And the adhesive strength tends to be low.
- the center line average surface roughness (Ra) of the adhesive layer is preferably 2 nm or more and 500 nm or less. If Ra is larger than 500 nm, the adhesive layer will not adhere completely even when it is soft when laminated on a polarizing plate, etc., causing distortion, and there will be problems such as generation of bubbles in the dents. .
- the center line average surface roughness of the pressure-sensitive adhesive layer is calculated by scanning the surface of the laminated film using a non-contact type three-dimensional surface roughness meter, measuring the displacement of the film surface, and using the surface analysis software. (Ra).
- the acryl-based pressure-sensitive adhesive to be used is not particularly limited, but in order to satisfy the above characteristics, for example, the pressure-sensitive adhesive described below is preferable.
- the acrylic pressure-sensitive adhesive includes a solvent-based pressure-sensitive adhesive and an emulsion-based pressure-sensitive adhesive, but a solvent-based pressure-sensitive adhesive is particularly preferable for easily obtaining the above-mentioned pressure-sensitive adhesive properties.
- a solvent-based pressure-sensitive adhesive use an adhesive obtained by solution polymerization in order to satisfy various properties.
- a raw material a known material for solution polymerization of an acrylic pressure-sensitive adhesive can be used.
- the acrylic pressure-sensitive adhesive an acrylic acid ester preferably Akuriru acid C 2 ⁇ 8 alkyl esters, more preferably Akuriru acid C 6 ⁇ 8 alkyl glycol ester, hydroxyl group, vinyl monomers and they are an epoxy group or force Rupokishiru group with a functional group
- a copolymer comprising another copolymerizable vinyl monomer different from the above is preferably used.
- examples thereof include acrylates such as ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, and octyl acrylate, and vinyl acetate as a comonomer for improving cohesion.
- Methacrylic acid acrylic acid, itaconic acid, hydroxyethyl methacrylate, dalicydilme, acrylic acid nitrile, styrene, methyl methacrylate, etc. Evening creators and the like. In order to impart low tackiness and tackiness and high cohesion, and to achieve high crosslinking with an isocyanate-based curing agent, those containing a large number of hydroxyl groups are particularly preferable.
- the glass transition temperature (T g) is low, and On the other hand, this can be achieved by using a small amount of comonomer components for increasing the cohesive force and having a high Tg.
- the synthesis of the pressure-sensitive adhesive can be performed by a known method. For example, in the presence of an organic solvent such as ethyl acetate or toluene, the necessary raw materials are charged into a reaction furnace, and a azobis-based azobisbisbutyronitrile such as benzoyl peroxide is used as a catalyst. It can be polymerized under heating.
- the weight average molecular weight (Mw) is preferably at least 300,000, more preferably at least 400,000. If the molecular weight is less than 300,000, even if it is cross-linked with an isocyanate curing agent, sufficient cohesive strength cannot be obtained. When the adhesive is peeled off after a lapse of time, the adhesive may remain on the stainless steel plate or polarizing plate. Control at the polymerization stage is important for improving the molecular weight.However, since the molecular weight does not increase even if a solvent system has sufficient adhesive strength, the molecular weight cannot be increased by adding the curing agent during use. It is necessary to improve or improve the crosslinking ratio.
- an isocyanate-based, epoxy-based, or argyline-based curing agent which is particularly common in acryl solvent systems, can be used.
- an isocyanate-based hardener an aromatic type such as toluylene diisocyanate (TDI) is preferable in order to obtain an adhesive force that is stable over time and to form a harder adhesive layer.
- the pressure-sensitive adhesive may contain additives such as a stabilizer, an ultraviolet absorber, a flame retardant, and an antistatic agent.
- low surface energy such as organic resin such as plastics, silicone, fluorine, etc.
- organic resin such as plastics, silicone, fluorine, etc.
- a component having the following may be added.
- an organic resin such as wax, a higher fatty acid ester or a low molecular weight fluoric acid ester may be used.
- the application of the adhesive solution to the polyester film (A) can be performed at any stage.
- a flame treatment, a corona discharge treatment, or the like may be applied to the polyester film surface as a preliminary treatment to improve adhesion and coating properties.
- the adhesive and polyester film can be treated by applying a physical surface treatment such as plasma discharge treatment, or by applying a chemical surface treatment to apply an organic resin or inorganic resin paint during or after film formation.
- the adhesion of the film (A) can be strengthened.
- any known method can be used.
- the adhesive applied to the polyester film (A) may be applied directly to the film by the above-mentioned coating method. Alternatively, once applied to the release film and dried, the polyester film ( A) may be attached to transfer the adhesive. In order to prepare a surface protective film having a smoother surface of the adhesive layer, it is preferable to apply once to a release film having a smoother surface and to transfer it to the polyester film (A).
- the drying temperature at this time is preferably such that the residual solvent is as small as possible.
- the drying temperature and time are not specified, but preferably at a temperature of 50 to 150 ° C, and for 10 seconds to 50 ° C. It is preferable to provide a drying time for one minute.
- the pressure-sensitive adhesive has fluidity, and when using an isocyanate-based curing agent as a cross-linking agent, the reaction is not yet completed immediately after heating and drying, and the reaction is completed to obtain stable adhesive strength. Also need curing. In general, when heated at room temperature for about one week or more, for example, at about 50 ° C., three days or more are preferable. In the case of heating, if the temperature is too high, the flatness of the base film may be deteriorated.
- the surface protective film of the present invention includes a polarizing film on the opposite side of the pressure-sensitive adhesive layer of the polyester film when the surface protective layer is peeled off.
- a layer containing an inhibitor and Z or a release agent may be mixed and provided in one layer, or each may be provided in one layer. Further, the antistatic layer may be mixed with the pressure-sensitive adhesive layer, or may be provided between the pressure-sensitive adhesive layer and the polyester film.
- Antistatic agents and release agents are used as binders to improve the strength of the layer and to improve adhesion to the biaxially oriented polyester film, water resistance, solvent resistance, blocking properties, etc.
- Resin thermoplastic resin such as acrylic resin, thermosetting acrylic resin, urethane resin, melamine resin, thermosetting resin such as epoxy resin, etc. It is preferable to include a polymer compound. It is particularly preferable that the crosslinking agent contains at least one selected from methylolated or alkylolated melamine-based, urea-based, acrylamide-based compounds, epoxy compounds, and polyisocyanates.
- antistatic agent examples include, for example, quaternary ammonium salts, pyridinium salts, various cationic antistatic agents having a cationic property such as primary to tertiary amino groups; sulfonate groups, nitrate ester bases, phosphate ester bases
- Anionic antistatic agents having anionic properties such as: Amionic amphoteric antistatic agents such as amino acids and aminosulfonates; Various types of nonionic antistatic agents, such as amino acids, glycerin, and polyethylene glycol Surfactant-type antistatic agents, and the above-mentioned polymerized ones can be used.
- conductive polymers such as polyaniline, polypyrrole, and polythiophene, and tin and antimony fillers dispersed therein can also be used.
- a metal layer of silver, tin, or the like may be provided by a vapor phase growth method, a vacuum evaporation method, a sputtering method, a plasma CVD method, or the like.
- the release agent Since the purpose of the release agent is to prevent the surface protective film from being stained, it is preferable that the release agent has an appropriate peeling force and is permanent.
- release agents include silicone-based, fluorine-based and alkyl polymer-based release agents.
- An alkyl polymer system having particularly low migration property is preferable from the viewpoint of preventing contamination in the process.
- the surface protective film of the present invention desirably has high transparency for easy inspection.
- the visible light transmittance is preferably 70% or more, and the haze is preferably 10% or less. If the visible light transmittance is less than 70% and the haze is more than 10%, the transparency is poor. May not be able to detect You.
- the present invention for the purpose of protecting the pressure-sensitive adhesive layer of the surface protective film, it is preferable to adopt a configuration of a laminate provided with a release film (D).
- a release film As the base film of the release film, it is preferable to use a film having the same configuration as the polyester film (A) in the surface protective film described above.
- a release layer on at least one surface of the release film.
- the release layer component include a silicone resin, a fluorine resin, a wax such as an aliphatic resin, and a olefin resin.
- a release layer may not be provided depending on the type of the pressure-sensitive adhesive layer (B).
- Various known additives can be added to the components forming the release layer as long as the objects of the present invention are not hindered.
- the additive include an ultraviolet absorber, a pigment, an antifoaming agent, and an antistatic agent.
- the release layer can be applied by applying a coating liquid containing a component for forming a release layer to a base film, and drying by heating to form. Heating conditions are 80 to 160 ° C for 10 to 120 seconds, especially 120 to 150 for 20 to 6
- any known method can be used, and examples thereof include a roll-co-one-time method and a blade-co-one-time method.
- an adhesive layer between the base film and the release layer in order to enhance the adhesion between the biaxially oriented polyester film as the base film for the release film and the release layer.
- a silane coupling agent is preferable.
- the silane coupling agent those represented by the general formula Y—Si— 3 are more preferable.
- Y represents a functional group represented by, for example, an amino group, an epoxy group, a vinyl group, a methacryl group, a mercapto group and the like
- X represents a hydrolyzable functional group represented by an alkoxy group.
- the thickness of such an adhesive layer is preferably in the range of 0.01 to 5 m, particularly preferably in the range of 0.02 to 2 / m.
- the thickness of the adhesive layer is within the above range, the adhesion between the base film and the release layer becomes good, and the base film provided with the adhesive layer is difficult to block, so that a problem occurs in handling the release film. There is a difficult advantage.
- a polyester film (A) is provided with a pressure-sensitive adhesive layer on one side and a protective layer on the other side, and the surface protective film is wound by bringing the pressure-sensitive adhesive layer and the protective layer into contact with each other.
- the surface protection film is unwound from this film roll and is attached to a mating substrate (a polarizing plate, a stainless steel plate, etc.) and is used for protecting the mating substrate surface. Then, when the mating base material is subjected to the processing step or the intended use, the bonded surface protective film is peeled off.
- the pressure-sensitive adhesive layer of the surface protective film has such properties that it can be easily bonded to the counterpart surface to be bonded (protective layer, polarizing plate, stainless steel plate, etc.) and can be easily peeled off.
- the peeling force when the protective layer (C) is peeled off from the pressure-sensitive adhesive layer (B) should be 1 O mN / 25 mm or more and 1,000 mNZ 25 mm or less. It is preferred that
- peeling force against the protective layer is less than 10 mNZ25 mm, winding deviation may occur when rolling, and if the peeling force is greater than 100 OmN / 25 mm, winding from the roll may occur.
- a film with a wide width at the time of dispensing requires a large amount of tension, which requires a large facility, and also increases the peeling charge, which may cause damage to the film surface.
- a surface protection film is stuck on the cleaned stainless steel plate with a rubber roller (light load) directly so that the adhesive layer of the surface protection film and the stainless steel plate are in contact with each other. And adhere. Then, leave it for 1 day at the temperature of 23 ° C and the humidity of 55 ⁇ 5% RH, and cut it into a 25 mm wide strip. This was attached to a tensile tester (Strograph manufactured by Toyo Seiki Co., Ltd.), and the surface protective laminated film was pulled at 180 ° at a speed of 30 OmmZ with the stainless steel plate fixed, and the strength was used as the normal adhesive force. .
- a 25 mm wide strip sample prepared in the same manner as the normal adhesive strength was left at 60 ° C for 1 week, returned to room temperature and left for 30 minutes, and then subjected to a tensile tester (Toyo Seiki Co., Ltd. With the stainless steel plate fixed, the surface protection film is pulled at 180 ° at a speed of 300 mm / min. The strength is defined as the adhesive strength after one week. Then, the value obtained by dividing this value by the value of the normal adhesive force is defined as the rate of change.
- a sample prepared in the same manner as for normal adhesion measurement is left at 80 ° C for 1 week after pasting. Then, peel off the laminated film at a speed of 10 m / min, observe the remaining adhesive on the stainless steel plate, and evaluate according to the following criteria.
- ⁇ One piece of adhesive remaining less than 1 mm square Z100 cm 2 or more
- X One piece of adhesive remaining larger than 1 mm square 100 cm 2 or more
- the surface roughness of the pressure-sensitive adhesive layer of the surface protection film can be determined by scanning the surface of the pressure-sensitive adhesive layer of the surface protection film using a non-contact three-dimensional surface roughness meter, measuring the displacement of the surface of the pressure-sensitive adhesive layer, and using surface analysis software
- the center plane average roughness (Ra) was determined from
- the surface roughness of the plastic film as the base film is determined by measuring the surface roughness of the plastic film on the side on which the adhesive layer is laminated by the surface roughness of the adhesive layer. It was determined in the same way as the measurement.
- the light transmittance is measured at a wavelength of 55 O nm by measuring the light transmittance (Poitsk haze meter SEP-HS-D1 type, manufactured by Nippon Seimitsu Kogaku Co., Ltd.).
- Tg glass transition temperature
- the refractive index in the longitudinal (longitudinal) direction (N MD ) and the refractive index in the lateral (width) direction (N TD ) of the film are measured using an Abbe refractometer, and the difference between the two measured values (N TD -N MD ) Is the value of birefringence ( ⁇ ).
- the laminate of the present invention is actually bonded to a non-defective polarizing plate, and a cross-Nicol inspection is performed.
- the bonding was performed by reproducing the actual process, the longitudinal direction of the biaxially oriented film was made to coincide with the direction of the orientation axis of the polarizing plate, and the evaluation was performed according to the following criteria.
- the film was extremely excellent with almost no light interference spots over the entire width of the formed base film.
- the center part in the width direction of the formed base film could be used without causing light interference spots.
- the surface of the pressure-sensitive adhesive layer of the surface protective film is directly adhered to a polarizing plate with a surface roughness (Ra) of 300 xm with a rubber roller, and then reciprocated with a 2 kg rubber roller once.
- Ra surface roughness
- ⁇ Less than 1 bubble with an average diameter of 1 mm or more on the surface of 21 Omm x 148 mm (area: 310. 8 cm 2 ).
- ⁇ 1 to 5 bubbles with an average diameter of 1 mm or more on the surface of 21 Omm x 148 mm (area: 310. 8 cm 2 ).
- X More than 5 bubbles with an average diameter of 1 mm or more on the surface of 21 Omm in length and 148 mm in width (area of 310.8 cm 2 ).
- a polyethylene terephthalate polymer having an intrinsic viscosity of 0.62 containing 0.1% by weight of true spherical silica particles having an average particle diameter of 0.15 / m is melted by an extruder and maintained at 40 ° C from a die.
- An unstretched film was obtained by closely contacting it on a rotating cooling drum using an electrostatic contact method and rapidly cooling it. Next, this unstretched film is stretched 3.5 times in the machine direction and 3.6 times in the transverse direction, and heat-set at 220 ° C to a thickness of 50 m and a birefringence of 0.
- a biaxially oriented polyethylene terephthalate film (A) was obtained as the base film for the surface protective film of No. 01.
- biaxially oriented polyethylene terephthalate film was repeated except that the thickness was changed to 38 m, to obtain a biaxially oriented polyethylene terephthalate film for a release film. Then, on one surface of the biaxially oriented polyethylene terephthalate film for the release film, a curable silicone of an addition reaction type comprising a polydimethylsiloxane having a vinyl group and dimethylhydrogensilane is solidified to a solid concentration of 2%.
- a release film (D) having a release layer thickness of 0.1 am was prepared.
- an acrylic adhesive 2-ethylhexyl acrylate as a main monomer, vinyl acetate as a comonomer, and hydroxyethyl methacrylate as a functional group-containing monomer in a ratio of 7: 2: 1 in a solvent of ethyl acetate.
- Solution polymerization was performed using azobisisobutyronitrile as a reaction catalyst to prepare a polymer for an adhesive having a weight average molecular weight of about 450,000.
- TD I-based isocyanate is added to the adhesive polymer. 5 parts were added to 100 parts of the adhesive polymer, and applied to the release layer side surface of the release film so that the thickness after drying was 20 im. An adhesive layer was formed.
- biaxially oriented polyethylene terephthalate film (A) serving as the base film of the above-mentioned surface protective film is subjected to corona treatment, and the adhesive layer of the release film having the above-mentioned adhesive layer formed thereon becomes the above-mentioned core layer.
- the film was bonded so as to be in contact with the film surface subjected to the opening treatment, and was subjected to an aging treatment at 60 ° C. for 3 days to obtain a surface protective film on which a release film (D) was laminated.
- Table 1 shows the properties of the obtained surface protective film.
- the polymer for the adhesive is 2-ethylhexyl acrylate as the main monomer, vinyl acetate as the comonomer, and hydroxyethyl methacrylate as the functional group-containing monomer in the ratio of 4: 4: 2 in the solvent of ethyl acetate.
- the weight average molecular weight was changed to about 300,000 by solution polymerization using azobisisobutyronitrile as the reaction catalyst, and the TDI-based isocyanate crosslinking agent and the amount added were changed to 30 parts of aziridine-based isocyanate crosslinking agent. Except for the above, it was prepared in the same manner as Example 1. Table 1 shows the properties of the obtained surface protection film.
- Example 1 a biaxially oriented polyethylene terephthalate film as a base film of a surface protection film was formed into a 50 m thick film formed by inflation of a polyethylene resin having a density of 0.925 and a melt index of 2.5. A sample was prepared in the same manner except that the polyethylene film was treated with corona. Table 1 shows the properties of the obtained surface protective film.
- Adhesive polymer is used as main monomer, 2-ethylhexyl acrylate, Weight average molecular weight obtained by solution polymerization of methyl acrylate as a monomer and hydroxyethyl methyl acrylate as a functional group-containing monomer in a ratio of 3: 1: 1 using azobisisobutyronitrile as a reaction catalyst in a solvent of ethyl acetate. The same operation as in Example 1 was repeated except that the number was changed to about 450,000. Table 1 shows the characteristics of the obtained surface protective film.
- the polymer for adhesives is composed of 2-ethylhexyl acrylate as the main monomer, butyl acrylate and methyl acrylate as the comonomer, and hydroxyethyl methacrylate as the functional group-containing monomer in a ratio of 4: 4: 1: 1.
- the ratio was changed to about 200,000 in weight average molecular weight by solution polymerization using azobisisobutyl nitrile as a reaction catalyst in a solvent of ethyl ethyl toluene (mixing ratio: 1Z1).
- a surface protection film was prepared in the same manner as in Example 2, except that the amount of the agent was changed to 1 part. Table 1 shows the properties of the obtained surface protective film. When this surface protection film is adhered to a stainless steel plate and peeled off, the adhesive remains, which is not suitable as a surface protection film because foreign matter adheres to the product despite its excellent defect inspection properties. Was something.
- PET represents polyethylene terephthalate and PE represents polyethylene.
- the surface protective film of the present invention shown in the examples was peeled off lightly after being bonded to the mating substrate, and without becoming heavy even after aging, and having a rough surface. It has a pressure-sensitive adhesive layer that does not cause lifting due to the incorporation of bubbles or the like when bonded to a substrate, and is highly transparent and does not impair the testability of the bonded counterpart substrate.
- the surface protective film of Comparative Example 1 was bonded to a mating substrate having a rough surface, floating occurred due to the incorporation of bubbles and the like, and the edge of the surface protective film of Comparative Example 2 after bonding.
- the surface protective film of Comparative Example 3 had many foreign substances in the surface protective film and had poor testability.
- Example 2 The same operation as in Example 2 was carried out except that 0.5% by weight of spherical silica particles having an average particle diameter of 0.5 m was added as particles to be contained in polyethylene terephthalate polymer as a base film of the release film. Repeated. In the obtained surface protective film, the pressure-sensitive adhesive layer could not be formed uniformly due to the presence of coarse projections on the surface of the release film, and the surface defect of the protective film was 1 per 30.8 cm 2 . There were as many as 0, which was actually difficult to use.
- Example 2 The same operation as in Example 2 was repeated except that 0.5% by weight of spherical silica particles having an average particle diameter of 0.5 m was added as particles to be contained in polyethylene terephthalate polymer as a base film of the release film.
- 0.5% by weight of spherical silica particles having an average particle diameter of 0.5 m was added as particles to be contained in polyethylene terephthalate polymer as a base film of the release film.
- the pressure-sensitive adhesive layer could not be formed uniformly due to the presence of coarse projections on the surface of the release film, and the surface defect of the protective film was 8 per 30.8 cm 2 . There were many, and it was actually difficult to use.
- Example 2 In the same manner as in Example 1, a biaxially oriented polyethylene terephthalate film as a base film of a surface protective film was obtained, and both surfaces of the film were subjected to corona treatment. Then, on one side of this film, an antistatic layer was provided as a first layer as a protective layer, and a release layer as a second layer.
- thiophene derivative polymer 30 70 parts by weight of copolyester (60 mol% of terephthalic acid, 35 mol% of isophthalic acid, 5 mol% of adipic acid, 95 mol% of ethylene glycol and 5 mol% of diethylene glycol as glycol components) ), And a 3% aqueous coating solution comprising 5 parts of a nonionic surfactant was applied to form a coating film having a thickness of 0.15 after drying.
- copolyester 60 mol% of terephthalic acid, 35 mol% of isophthalic acid, 5 mol% of adipic acid, 95 mol% of ethylene glycol and 5 mol% of diethylene glycol as glycol components
- the release layer 40 parts of polyethylene iminooctadecyl carbamate (RP-20, manufactured by Nippon Shokubai Co., Ltd.), and as the binder component, a polyester-based polyester resin (Hitachi Chemical Industries, Ltd. Co., Ltd., 100 parts of Espel 1510) and 30 parts of melamine resin (manufactured by Sanwa Chemical Co., Ltd., Nishiro Rack NS-11), and apply the coating liquid, and then dry at 14 O for 1 minute. 'Hardened to form a release layer having a thickness of 0.2.
- an aziridine-based isocyanate crosslinking agent was added to the pressure-sensitive adhesive polymer in an amount of 20 parts per 100 parts of the pressure-sensitive adhesive polymer, and the biaxially oriented polyethylene terephthalate film was coated on a surface different from the protective layer.
- the film was dried so as to have a thickness of 20 / xm, dried for 100 minutes, wound up, and aged at 45 ° C for 1 week to obtain a film roll.
- Table 2 shows the properties of the obtained film roll.
- Example 3 an adhesive was applied to the opposite surface of the antistatic layer without providing a release layer, and the layer was wound up.
- Table 2 shows the properties of the obtained film roll.
- PET stands for polyethylene terephthalate.
- the film roll of the present invention shown in the examples was peeled off lightly after being bonded to a mating base material without becoming heavy even after aging, and was used for a base material having a rough surface.
- Adhesive layer that does not float due to the incorporation of air bubbles and the like when bonded together, and has good testability for the mating base material because it is highly transparent, and easily peels off from the protective layer surface It could be used.
- the pressure-sensitive adhesive layer (B) was difficult to peel off from the protective layer surface, and the surface of the pressure-sensitive adhesive layer (B) was roughened when peeling off. Air bubbles were confirmed when they were combined.
- Example 1 the birefringence was such that the stretching ratio when the base film of the protective film was stretched to the unstretched film was changed to 1.5 times in the longitudinal direction and 4.3 times in the transverse direction. The same operation was repeated except that a biaxially oriented film having a force of SO.10 was used.
- the obtained laminated film has the same characteristics as in Example 1 described above.
- the laminated film is adhered to a non-defective polarizing plate and inspected by the cross Nicol method, the laminated film covers the entire width of the formed base film. Thus, it was extremely excellent with almost no light spots.
- the laminated films of Examples 1 to 3 described above light interference spots are slightly observed at both ends in the width direction of the formed base film, but excellent base films that can be used for most base films are used. Met.
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP00962930A EP1154005A4 (en) | 1999-10-01 | 2000-09-28 | SURFACE PROTECTION FILM AND COMPOSITE MATERIAL MADE THEREOF |
US09/857,289 US6582789B1 (en) | 1999-10-01 | 2000-09-28 | Surface protective film and laminate formed therefrom |
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JP28144099A JP4336427B2 (ja) | 1999-10-01 | 1999-10-01 | 表面保護フィルムおよびそれからなる積層体 |
JP11/281440 | 1999-10-01 |
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WO2001025363A1 true WO2001025363A1 (fr) | 2001-04-12 |
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PCT/JP2000/006713 WO2001025363A1 (fr) | 1999-10-01 | 2000-09-28 | Film de protection de surface et lamine a base de ce film |
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US (1) | US6582789B1 (ja) |
EP (1) | EP1154005A4 (ja) |
JP (1) | JP4336427B2 (ja) |
KR (1) | KR100586207B1 (ja) |
TW (1) | TWI272185B (ja) |
WO (1) | WO2001025363A1 (ja) |
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KR100820530B1 (ko) * | 2001-06-14 | 2008-04-07 | 소니 케미카루 앤드 인포메이션 디바이스 가부시키가이샤 | 박리 필름 및 박리 필름을 사용한 접착 필름 |
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Also Published As
Publication number | Publication date |
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TWI272185B (en) | 2007-02-01 |
US6582789B1 (en) | 2003-06-24 |
EP1154005A4 (en) | 2003-06-11 |
KR20010101097A (ko) | 2001-11-14 |
EP1154005A1 (en) | 2001-11-14 |
KR100586207B1 (ko) | 2006-06-07 |
JP2001106991A (ja) | 2001-04-17 |
JP4336427B2 (ja) | 2009-09-30 |
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