WO1992019706A2 - 1,1,1,2,2,3,3,4,4,5,6-undecafluorohexane and use thereof in compositions and processes for cleaning - Google Patents
1,1,1,2,2,3,3,4,4,5,6-undecafluorohexane and use thereof in compositions and processes for cleaning Download PDFInfo
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- WO1992019706A2 WO1992019706A2 PCT/US1992/003323 US9203323W WO9219706A2 WO 1992019706 A2 WO1992019706 A2 WO 1992019706A2 US 9203323 W US9203323 W US 9203323W WO 9219706 A2 WO9219706 A2 WO 9219706A2
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- Prior art keywords
- undecafluorohexane
- compositions
- cleaning
- carbon atoms
- mixtures
- Prior art date
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- 239000000203 mixture Substances 0.000 title claims abstract description 47
- 238000004140 cleaning Methods 0.000 title claims abstract description 21
- YSMPWGSVSUPYPY-UHFFFAOYSA-N 1,1,1,2,2,3,3,4,4,5,6-undecafluorohexane Chemical compound FCC(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F YSMPWGSVSUPYPY-UHFFFAOYSA-N 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 title description 9
- 230000008569 process Effects 0.000 title description 4
- LYGJENNIWJXYER-UHFFFAOYSA-N nitromethane Chemical compound C[N+]([O-])=O LYGJENNIWJXYER-UHFFFAOYSA-N 0.000 claims abstract description 10
- 150000001875 compounds Chemical class 0.000 claims abstract description 9
- 150000008282 halocarbons Chemical class 0.000 claims abstract description 8
- 150000001298 alcohols Chemical class 0.000 claims abstract description 7
- 150000002576 ketones Chemical class 0.000 claims abstract description 7
- 150000002148 esters Chemical class 0.000 claims abstract description 6
- 150000002170 ethers Chemical class 0.000 claims abstract description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 27
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 25
- 239000002904 solvent Substances 0.000 claims description 25
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 13
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 9
- 239000000460 chlorine Substances 0.000 claims description 9
- 229910052801 chlorine Inorganic materials 0.000 claims description 9
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 8
- 125000004432 carbon atom Chemical group C* 0.000 claims description 8
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 4
- UKDOTCFNLHHKOF-FGRDZWBJSA-N (z)-1-chloroprop-1-ene;(z)-1,2-dichloroethene Chemical group C\C=C/Cl.Cl\C=C/Cl UKDOTCFNLHHKOF-FGRDZWBJSA-N 0.000 claims description 3
- 239000007787 solid Substances 0.000 abstract description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 8
- 238000009835 boiling Methods 0.000 description 8
- 229910052731 fluorine Inorganic materials 0.000 description 8
- 239000011737 fluorine Substances 0.000 description 8
- 230000004907 flux Effects 0.000 description 7
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 6
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 5
- 150000002430 hydrocarbons Chemical class 0.000 description 5
- GVEUEBXMTMZVSD-UHFFFAOYSA-N 3,3,4,4,5,5,6,6,6-nonafluorohex-1-ene Chemical compound FC(F)(F)C(F)(F)C(F)(F)C(F)(F)C=C GVEUEBXMTMZVSD-UHFFFAOYSA-N 0.000 description 4
- 150000001336 alkenes Chemical class 0.000 description 4
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 4
- -1 tetrahydrofuran Chemical class 0.000 description 4
- 239000000356 contaminant Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- BOSAWIQFTJIYIS-UHFFFAOYSA-N 1,1,1-trichloro-2,2,2-trifluoroethane Chemical compound FC(F)(F)C(Cl)(Cl)Cl BOSAWIQFTJIYIS-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 150000002894 organic compounds Chemical class 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- AJDIZQLSFPQPEY-UHFFFAOYSA-N 1,1,2-Trichlorotrifluoroethane Chemical compound FC(F)(Cl)C(F)(Cl)Cl AJDIZQLSFPQPEY-UHFFFAOYSA-N 0.000 description 1
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 description 1
- SKDFWEPBABSFMG-UHFFFAOYSA-N 1,2-dichloro-1,1-difluoroethane Chemical compound FC(F)(Cl)CCl SKDFWEPBABSFMG-UHFFFAOYSA-N 0.000 description 1
- 238000004293 19F NMR spectroscopy Methods 0.000 description 1
- 238000005160 1H NMR spectroscopy Methods 0.000 description 1
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- CYTYCFOTNPOANT-UHFFFAOYSA-N Perchloroethylene Chemical group ClC(Cl)=C(Cl)Cl CYTYCFOTNPOANT-UHFFFAOYSA-N 0.000 description 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 1
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 125000000746 allylic group Chemical group 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000003682 fluorination reaction Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical group 0.000 description 1
- 150000005826 halohydrocarbons Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 description 1
- CYRMSUTZVYGINF-UHFFFAOYSA-N trichlorofluoromethane Chemical compound FC(Cl)(Cl)Cl CYRMSUTZVYGINF-UHFFFAOYSA-N 0.000 description 1
- 229940029284 trichlorofluoromethane Drugs 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/26—Organic compounds containing oxygen
- C11D7/261—Alcohols; Phenols
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C19/00—Acyclic saturated compounds containing halogen atoms
- C07C19/08—Acyclic saturated compounds containing halogen atoms containing fluorine
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/50—Solvents
- C11D7/5004—Organic solvents
- C11D7/5018—Halogenated solvents
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/26—Organic compounds containing oxygen
- C11D7/263—Ethers
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/26—Organic compounds containing oxygen
- C11D7/264—Aldehydes; Ketones; Acetals or ketals
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/26—Organic compounds containing oxygen
- C11D7/266—Esters or carbonates
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/28—Organic compounds containing halogen
Definitions
- This invention relates to halogen substituted hydrocarbon compounds, their compositions and uses, and more particularly to fluorine-substituted hydrocarbons, their mixtures with solvents, such as ethanol or methanol, and the use thereof for cleaning solid surfaces.
- Boiling point, flammability, and solvent power can often be adjusted by preparing mixtures of solvents.
- solvents e.g., isopropyl alcohol and nitromethane
- certain mixtures of l,l,2-trichloro-l,2,2- trifluoroethane with other solvents e.g., isopropyl alcohol and nitromethane
- solvents e.g., isopropyl alcohol and nitromethane
- the requirements for a cleaning solvent are relatively stringent (i.e., it is generally desirable in circuit board cleaning to use solvents that have low boiling points, are non-flammable, have low toxicity, and have high solvent power so that flux (such as rosin) and flux residues which result from soldering electronic components to the circuit board, can be removed without damage to the circuit board substrate) .
- compositions using halohydrocarbons containing fluorine have been discovered and in some cases used as solvents for the removal of solder fluxes and flux residues from printed circuit boards and for miscellaneous vapor degreasing applications.
- U.S. Patent No. 2,999,815 discloses the azeotrope of l,l,2-trichloro-l,2,2-trifluoroethane with acetone
- U.S. Patent No. 3,903,009 discloses a ternary azeotrope of l,l,2-trichloro-l,2,2-trifluoroethane with nitromethane and ethanol
- 3,573,213 discloses an azeotrope of l,l,2-trichloro-l,2,2- trifluoroethane with nitromethane;
- U.S. Patent No. 3,789,006 discloses the ternary azeotrope of 1,1,2- trichloro-l,2,2-trifluoroethane with nitromethane and isopropyl alcohol;
- U.S. Patent No. 3,728,268 discloses the ternary azeotrope of 1,l,2-trichloro-l,2,2- trifluoroethane with acetone and ethanol;
- 2,999,817 discloses the binary azeotrope of 1,1,2- trichloro-l,2,2-trifluoroethane and ethylene chloride; and U.S. Patent No. 4,715,900 discloses ternary compositions of trichlorotrifluoroethane, dichlorodifluoroethane, and ethanol or methanol.
- solvent compositions which have proven useful for cleaning contain at least one component that is a halogen-substituted hydrocarbon containing chlorine, and concerns have been raised over the ozone depletion potential of halogen-substituted hydrocarbons that contain chlorine.
- compositions that may at least partially replace the chlorine-containing components with other components having lower potential for ozone depletion.
- Various methods of preparing organic compounds containing fluorine are known. The fluorination of double bonds with elemental fluorine has been discussed in S. Rozen, et al., J. Org. Chem., 51, 3607 (1986); L. Conte, et al., J. Fluorine Chem., 38, 319 (1988); and C. Gervasutti, et al., U.S. Patent No. 4,754,085 (1988).
- This invention provides a novel fluorohydrocarbon compound, 1,1,1,2,2,3,3,4,4,5,6-undecafluorohexane, and mixtures thereof with miscible solvents such as alcohols (e.g., methanol, ethanol, etc.), ethers (e.g., tetrahydrofuran, etc.), esters, ketones (e.g., acetone), nitromethane, and halogenated hydrocarbons (e.g., 1,2- dichloroethylene, etc.).
- miscible solvents such as alcohols (e.g., methanol, ethanol, etc.), ethers (e.g., tetrahydrofuran, etc.), esters, ketones (e.g., acetone), nitromethane, and halogenated hydrocarbons (e.g., 1,2- dichloroethylene, etc.).
- solvents e.g., methanol, ethanol, etc.
- ethers e.g
- a novel fluorohydrocarbon compound 1,1,1,2,2,3,3,4,4,5,6-undecafluorohexane (i.e., CF 3 CF 2 CF 2 CF2CHFCH2F) , is provided in accordance with this invention.
- the designation of this compound in conventional nomenclature for halogen-substituted hydrocarbons containing fluorine is HFC-54-llqe.
- HFC-54-llqe may be prepared by dissolving the olefin, 3,3,4,4,5,5,6,6,6-nonafluoro-l-hexene, in trichloro- fluoromethane, cooling the solution to -78°C, and bubbling a mixture of fluorine in nitrogen through the cooled solution of olefin. After reaction, the product may be isolated by washing with bicarbonate and then with water, drying over magnesium sulfate, and distilling to give pure HFC-54-llqe with a one degree boiling point range.
- HFC-54-llqe is a liquid under ambient conditions and is considered useful as a solvent for cleaning contaminants from solid substrates.
- HFC-54-llqe is miscible with various solvents conventionally used in cleaning operations.
- compositions which are suitable for use in cleaning operations and which comprise a mixture of HFC-54-llqe with one or more compounds selected from the group consisting of alcohols, ethers, esters, ketones, nitromethane, and halogenated hydrocarbons, can thus be prepared.
- the preferred alcohols and halogenated hydrocarbons contain from 1 to 4 carbon atoms; the preferred ethers contain from 2 to 4 carbon atoms; and the preferred esters and ketones contain from 3 to 4 carbon atoms.
- suitable alcohols include methanol and ethanol.
- An example of a suitable ether is tetrahydrofuran.
- An example of a suitable ketone is acetone.
- the preferred halogenated hydrocarbons contain hydrogen as well as chlorine and/or fluorine.
- An example of a suitable halogenated hydrocarbon is 1,2- dichloroethylene.
- such compositions contain at least about 5 percent by weight of HFC-54-llqe and can contain up to 95 percent by weight, or even more, of HFC-54-llqe.
- Most preferred with respect to ozone depletion potential are compositions in which none of the components contain chlorine.
- a composition which comprises an admixture of effective amounts of HFC-54-llqe and one or more solvents selected from the group consisting of alcohols, ethers, esters, ketones, nitromethane and halogenated hydrocarbons to form an azeotrope or azeotrope-like mixture, are considered especially useful.
- azeotrope or azeotrope-like is meant constant boiling liquid admixtures of two or more substances, which admixtures behave like a single substance in that the vapor produced by partial evaporation or distillation has the same composition as the liquid (i.e., the admixtures distill without a substantial change in composition) .
- Constant boiling compositions characterized as azeotropes or azeotrope-like exhibit either a maximum or minimum boiling point as compared with that of nonazeotropic mixtures of the same substances.
- effective amounts is meant the amounts of each component of the admixture of the instant invention, which, when combined, results in the formation of the azeotrope or azeotrope-like admixture of the instant invention.
- compositions that are mixtures of HFC-54-llqe with alcohol selected from the group consisting of methanol and ethanol are preferred.
- HFC-54-llqe, its mixtures with methanol and ethanol, and other mixtures of this invention are useful in a wide variety of processes for cleaning solid surfaces, which comprise treating said surface therewith. Applications include removal of flux and flux residues from printed circuit boards contaminated therewith.
- compositions provided in accordance with this invention can be used in cleaning processes such as is described in U.S. Patent No. 3,881,949 and U.S. Patent No. 4,715,900, both of which are incorporated herein by reference.
- Azeotropic compositions permit easy recovery and reuse of the solvent from vapor defluxing and degreasing operations' because of their azeotropic nature.
- compositions of this invention may be used in conventional apparatus, employing conventional operating techniques.
- the solvent(s) may be used without heat if desired, but the cleaning action of the solvent(s) may be assisted by conventional means (e.g., heating, agitation, etc.).
- conventional means e.g., heating, agitation, etc.
- ultrasonic irradiation it may be advantageous to use ultrasonic irradiation in combination with the solvent(s).
- the mixtures of the instant invention can be prepared by any convenient method including mixing or combining the desired amounts of the components.
- a preferred method is to weigh the desired amounts of each component and thereafter combine them in an appropriate container.
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- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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Abstract
The compound, 1,1,1,2,2,3,3,4,4,5,6-undecafluorohexane, and mixtures thereof with alcohols, ethers, esters, ketones, nitromethane, and halogenated hydrocarbons are disclosed; as is the use thereof for cleaning a solid surface by treating the surface with said compound or said mixtures.
Description
1,1,1,2,2,3,3,4,4,5,6-UrøECAFLUOROHEXANE .AND USE THEREOF IN COMPOSITIONS .AND PROCESSES FOR CLE.ANING FIELP OF THE INVENTION
This invention relates to halogen substituted hydrocarbon compounds, their compositions and uses, and more particularly to fluorine-substituted hydrocarbons, their mixtures with solvents, such as ethanol or methanol, and the use thereof for cleaning solid surfaces.
BACKGROUND OF THE TNVENTTON
Various organic solvents have been used as cleaning liquids for the removal of contaminants from contaminated articles and materials. Certain fluorine- containing organic compounds, such as 1,1,2-trichloro- 1,2,2-trifluoroethane, are useful for this purpose, particularly with regard to cleaning organic polymers and plastics which may be sensitive to other more common and more powerful solvents such as trichloroethylene or perchloroethylene. Recently, however, there have been efforts to reduce the use of certain compounds such as trichlorotrifluoroethane (which contain chlorine) because of a concern over their potential to deplete ozone, and to affect thereby the layer of ozone that is considered important in protecting the Earth's surface from ultraviolet radiation.
Boiling point, flammability, and solvent power can often be adjusted by preparing mixtures of solvents. For example, certain mixtures of l,l,2-trichloro-l,2,2- trifluoroethane with other solvents (e.g., isopropyl alcohol and nitromethane) have been reported as useful in removing contaminants that are not removed by 1,1,2- trichloro-l,2,2-trifluoroethane alone, and in cleaning articles, such as electronic circuit boards, where the
requirements for a cleaning solvent are relatively stringent (i.e., it is generally desirable in circuit board cleaning to use solvents that have low boiling points, are non-flammable, have low toxicity, and have high solvent power so that flux (such as rosin) and flux residues which result from soldering electronic components to the circuit board, can be removed without damage to the circuit board substrate) .
Whereas boiling point, flammability, and solvent power can often be adjusted by preparing mixtures of solvents, the utility of the resulting mixtures can be enhanced for certain applications if the mixtures do not fractionate to an undesirable degree during use and recovery for reuse. Azeotropic compositions, with their constant boiling points and constant composition characteristics, are thus considered particularly useful.
A number of compositions using halohydrocarbons containing fluorine have been discovered and in some cases used as solvents for the removal of solder fluxes and flux residues from printed circuit boards and for miscellaneous vapor degreasing applications. For example, U.S. Patent No. 2,999,815 discloses the azeotrope of l,l,2-trichloro-l,2,2-trifluoroethane with acetone; U.S. Patent No. 3,903,009 discloses a ternary azeotrope of l,l,2-trichloro-l,2,2-trifluoroethane with nitromethane and ethanol; U.S. Patent No. 3,573,213 discloses an azeotrope of l,l,2-trichloro-l,2,2- trifluoroethane with nitromethane; U.S. Patent No. 3,789,006 discloses the ternary azeotrope of 1,1,2- trichloro-l,2,2-trifluoroethane with nitromethane and isopropyl alcohol; U.S. Patent No. 3,728,268 discloses the ternary azeotrope of 1,l,2-trichloro-l,2,2- trifluoroethane with acetone and ethanol; U.S. Patent No. 2,999,817 discloses the binary azeotrope of 1,1,2-
trichloro-l,2,2-trifluoroethane and ethylene chloride; and U.S. Patent No. 4,715,900 discloses ternary compositions of trichlorotrifluoroethane, dichlorodifluoroethane, and ethanol or methanol. As noted above, many solvent compositions which have proven useful for cleaning contain at least one component that is a halogen-substituted hydrocarbon containing chlorine, and concerns have been raised over the ozone depletion potential of halogen-substituted hydrocarbons that contain chlorine. Efforts are being made to develop compositions that may at least partially replace the chlorine-containing components with other components having lower potential for ozone depletion. Various methods of preparing organic compounds containing fluorine are known. The fluorination of double bonds with elemental fluorine has been discussed in S. Rozen, et al., J. Org. Chem., 51, 3607 (1986); L. Conte, et al., J. Fluorine Chem., 38, 319 (1988); and C. Gervasutti, et al., U.S. Patent No. 4,754,085 (1988). SUMMARY OF THE INVENTION
This invention provides a novel fluorohydrocarbon compound, 1,1,1,2,2,3,3,4,4,5,6-undecafluorohexane, and mixtures thereof with miscible solvents such as alcohols (e.g., methanol, ethanol, etc.), ethers (e.g., tetrahydrofuran, etc.), esters, ketones (e.g., acetone), nitromethane, and halogenated hydrocarbons (e.g., 1,2- dichloroethylene, etc.). The compound, 1,1,1,2,2,3,3,4,4,5,6-undecafluorohexane, and its compositions with such solvents are well suited for solvent cleaning applications. Mixtures in which none of the components contain chlorine are preferred. DETAILED DESCRIPTION OF THE INVENTION
A novel fluorohydrocarbon compound, 1,1,1,2,2,3,3,4,4,5,6-undecafluorohexane (i.e., CF3CF2CF2CF2CHFCH2F) , is provided in accordance with this
invention. The designation of this compound in conventional nomenclature for halogen-substituted hydrocarbons containing fluorine is HFC-54-llqe. HFC-54-llqe may be prepared by dissolving the olefin, 3,3,4,4,5,5,6,6,6-nonafluoro-l-hexene, in trichloro- fluoromethane, cooling the solution to -78°C, and bubbling a mixture of fluorine in nitrogen through the cooled solution of olefin. After reaction, the product may be isolated by washing with bicarbonate and then with water, drying over magnesium sulfate, and distilling to give pure HFC-54-llqe with a one degree boiling point range. 3,3,4,4,5,5,6,6,6-Nonafluoro-l- hexene (i.e., HFC-1549zf, CF3CF2CF2CF2CH*=CH2) is commercially available and may be prepared according to the method disclosed in British Patent Specification 1,244,256. HFC-54-llqe is a liquid under ambient conditions and is considered useful as a solvent for cleaning contaminants from solid substrates.
HFC-54-llqe is miscible with various solvents conventionally used in cleaning operations.
Compositions which are suitable for use in cleaning operations and which comprise a mixture of HFC-54-llqe with one or more compounds selected from the group consisting of alcohols, ethers, esters, ketones, nitromethane, and halogenated hydrocarbons, can thus be prepared. The preferred alcohols and halogenated hydrocarbons contain from 1 to 4 carbon atoms; the preferred ethers contain from 2 to 4 carbon atoms; and the preferred esters and ketones contain from 3 to 4 carbon atoms. Examples of suitable alcohols include methanol and ethanol. An example of a suitable ether is tetrahydrofuran. An example of a suitable ketone is acetone. The preferred halogenated hydrocarbons contain hydrogen as well as chlorine and/or fluorine. An example of a suitable halogenated hydrocarbon is 1,2-
dichloroethylene. Preferably, such compositions contain at least about 5 percent by weight of HFC-54-llqe and can contain up to 95 percent by weight, or even more, of HFC-54-llqe. Most preferred with respect to ozone depletion potential are compositions in which none of the components contain chlorine.
A composition, which comprises an admixture of effective amounts of HFC-54-llqe and one or more solvents selected from the group consisting of alcohols, ethers, esters, ketones, nitromethane and halogenated hydrocarbons to form an azeotrope or azeotrope-like mixture, are considered especially useful. By azeotrope or azeotrope-like is meant constant boiling liquid admixtures of two or more substances, which admixtures behave like a single substance in that the vapor produced by partial evaporation or distillation has the same composition as the liquid (i.e., the admixtures distill without a substantial change in composition) . Constant boiling compositions characterized as azeotropes or azeotrope-like exhibit either a maximum or minimum boiling point as compared with that of nonazeotropic mixtures of the same substances. By effective amounts is meant the amounts of each component of the admixture of the instant invention, which, when combined, results in the formation of the azeotrope or azeotrope-like admixture of the instant invention.
Compositions that are mixtures of HFC-54-llqe with alcohol selected from the group consisting of methanol and ethanol are preferred. HFC-54-llqe, its mixtures with methanol and ethanol, and other mixtures of this invention are useful in a wide variety of processes for cleaning solid surfaces, which comprise treating said surface therewith. Applications include removal of flux and flux residues from printed circuit boards contaminated therewith. As an example, compositions
provided in accordance with this invention can be used in cleaning processes such as is described in U.S. Patent No. 3,881,949 and U.S. Patent No. 4,715,900, both of which are incorporated herein by reference. Azeotropic compositions permit easy recovery and reuse of the solvent from vapor defluxing and degreasing operations' because of their azeotropic nature.
The compositions of this invention may be used in conventional apparatus, employing conventional operating techniques. The solvent(s) may be used without heat if desired, but the cleaning action of the solvent(s) may be assisted by conventional means (e.g., heating, agitation, etc.). In some applications (e.g., removing certain tenacious fluxes from soldered components) it may be advantageous to use ultrasonic irradiation in combination with the solvent(s).
The mixtures of the instant invention can be prepared by any convenient method including mixing or combining the desired amounts of the components. A preferred method is to weigh the desired amounts of each component and thereafter combine them in an appropriate container.
Practice of the invention will become further apparent from the following non-limiting examples. EXAMPLE 1
The olefin, 3,3,4,4,5,5,6,6,6-nonafluoro-l-hexene, C4F9CH=CH2 (40 mL) was dissolved in 400 mL of CFCI3 and cooled to -78°C. A mixture of 6% F2 in N2 was prepared and bubbled through the cold olefin solution at the rate of 350 mL/min. A total of 290 mmol of fluorine was used. The reaction mixture was washed with sodium bicarbonate solution, and then water. The washed mixture was dried over anhydrous gSθ , and distilled. The product was collected at about 87-88°C (atmospheric pressure). 1H NMR 4.6-5.3 ppm (m) ; 19F NMR 81.5 (3F, b
singlet), 121-128.5 (6F, m), 208.0 (IF, ), 236.7 ppm (IF, triplet, m) ; MS ro/e 245 (M-F-HF)+; 95 (CF2CH-CH or CF2CH=CHF)+; both resulting from allylic cleavage after HF elimination. The average yield of three runs was about 50%.
EXAMPLE 2
The iscibility of HFC-54-llqe with the organic solvents methanol, ethanol, nitromethane, tetrahydrofuran, acetone, and cis-l,2-dichloroethylene, was respectively demonstrated by mixing 5 μL of
HFC-54-llqe with 100 μL of each solvent and mixing 5 μL of each of the organic solvents with 100 μL of HFC-54-llqe. Complete miscibility was observed in all twelve cases. Particular embodiments of the invention are included in the examples. Other embodiments will become apparent to those skilled in the art from a consideration of the specification or practice of the invention disclosed herein. It is understood that modifications and variations may be practiced without departing from the spirit and scope of the novel concepts of this invention. It is further understood that the invention is not confined to the particular formulations and examples herein illustrated, but it embraces such modified forms thereof as come within the scope of the following claims.
Claims
1. The compound 1,1,1,2,2,3,3,4,4,5,6- undecafluorohexane.
2. A cleaning composition comprising (i) between about 5 and 95 percent by weight 1,1,1,2,2,3,3,4,4,5,6- undecafluorohexane and (ii) one or more solvents selected from the group consisting of alcohols containing from 1 to 4 carbon atoms, esters containing from 3 to 4 carbon atoms, ethers containing from 2 to 4 carbon atoms, ketones containing from 3 to 4 carbon atoms, halogenated hydrocarbons containing from 1 to 4 carbon atoms, and nitromethane.
3. The cleaning composition of Claim 2 in which none of the components contain chlorine.
4. The cleaning composition of Claim 2 which consists essentially of 1,1,1,2,2,3,3,4,4,5,6- undecafluorohexane and one or more solvents selected from the group consisting of methanol, ethanol, tetrahydrofuran, acetone, and 1,2-dichloroethylene.
5. The cleaning composition of Claim 4 in which none of the components contain chlorine.
6. The cleaning composition of Claim 2 which consists essentially of 1,1,1,2,2,3,3,4,4,5,6- undecafluorohexane and at least one alcohol selected from the group consisting of methanol and ethanol.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US07/695,826 US5250213A (en) | 1991-05-06 | 1991-05-06 | 1,1,1,2,2,3,3,4,4,5,6-undecafluorohexane and use thereof in compositions and processes for cleaning |
US695,826 | 1991-05-06 |
Publications (2)
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WO1992019706A2 true WO1992019706A2 (en) | 1992-11-12 |
WO1992019706A3 WO1992019706A3 (en) | 1993-01-07 |
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PCT/US1992/003323 WO1992019706A2 (en) | 1991-05-06 | 1992-04-29 | 1,1,1,2,2,3,3,4,4,5,6-undecafluorohexane and use thereof in compositions and processes for cleaning |
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US (1) | US5250213A (en) |
WO (1) | WO1992019706A2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995019947A1 (en) * | 1994-01-21 | 1995-07-27 | Alliedsignal Inc. | Hydrofuoroalkanes as cleaning and degreasing solvents |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5531916A (en) * | 1990-10-03 | 1996-07-02 | E. I. Du Pont De Nemours And Company | Hydrofluorocarbon cleaning compositions |
US5171902A (en) * | 1990-10-11 | 1992-12-15 | E. I. Du Pont De Nemours And Company | Saturated linear polyfluorohydrocarbons, processes for their production, and their use in cleaning compositions |
US5536327A (en) * | 1994-11-21 | 1996-07-16 | Entropic Systems, Inc. | Removal of hydrocarbon or fluorocarbon residues using coupling agent additives |
KR100207982B1 (en) * | 1996-07-19 | 1999-07-15 | 윤종용 | Cleaner & cleaning method of metalmask for improving continuance of printing in surface mounting process |
US6852684B1 (en) | 1998-09-21 | 2005-02-08 | E. I. Du Pont De Nemours And Company | Non-flammable, high-solvency compositions comprising trans-1,2-dichloroethylene, solvent, and inerting agent |
US6699829B2 (en) | 2002-06-07 | 2004-03-02 | Kyzen Corporation | Cleaning compositions containing dichloroethylene and six carbon alkoxy substituted perfluoro compounds |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0431458A1 (en) * | 1989-12-07 | 1991-06-12 | Daikin Industries, Limited | Cleaning composition |
US5076956A (en) * | 1990-11-29 | 1991-12-31 | E. I. Du Pont De Nemours And Company | Compositions of octafluorotrifluoromethylpentane and nonafluorotrifluoromethylpentane and use thereof for cleaning solid surfaces |
Family Cites Families (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2490764A (en) * | 1945-07-04 | 1949-12-13 | Kinetic Chemicals Inc | Fluorinated organic compounds |
US2980740A (en) * | 1958-06-19 | 1961-04-18 | Du Pont | alpha, alpha, omega-trihydroperfluoroalkanes |
US2999815A (en) * | 1960-08-11 | 1961-09-12 | Du Pont | Azeotropic composition |
US2999817A (en) * | 1960-08-15 | 1961-09-12 | Du Pont | Azeotropic composition |
GB1204706A (en) * | 1967-08-24 | 1970-09-09 | Ici Ltd | Preparation of -hydroperfluoroalkanes |
US3573213A (en) * | 1968-01-18 | 1971-03-30 | Du Pont | Azeotrope of 1,1,2-trichloro-1,2,2-trifluoroethane and nitromethane |
FR1560544A (en) * | 1968-01-31 | 1969-03-21 | ||
GB1330534A (en) * | 1970-07-07 | 1973-09-19 | Ici Ltd | Solvent compositions |
US3728268A (en) * | 1970-12-11 | 1973-04-17 | Du Pont | Mixtures of 1,1,2-trichloro-1,2,2-trifluoroethane,ethanol and acetone and a ternary azeotrope thereof |
US3729567A (en) * | 1971-07-15 | 1973-04-24 | Airco Inc | 1,1,5-trihydro-perfluoropentane as an inhalation anesthetic |
US3881949A (en) * | 1973-02-27 | 1975-05-06 | Du Pont | Vapor degreaser process employing trichlorotrifluoroethane and ethanol |
US3903009A (en) * | 1973-11-16 | 1975-09-02 | Du Pont | Azeotrope of 1,1,2-trichloro-1,2,2-trifluoroethane, ethanol and nitromethane |
IT1200806B (en) * | 1985-10-21 | 1989-01-27 | Ausimont Spa | PROCEDURE FOR THE PREPARATION OF HYDROALFLUOROALKANE |
US4715900A (en) * | 1987-01-08 | 1987-12-29 | E. I. Du Pont De Nemours And Company | Azeotropic compositions of trichlorotrifluoroethane, dichlorodifluoroethane and methanol/ethanol |
GB8712989D0 (en) * | 1987-06-03 | 1987-07-08 | Ici Plc | Electrochemical process |
DE3735467A1 (en) * | 1987-10-20 | 1989-05-03 | Bayer Ag | METHOD FOR PRODUCING FLUORINATED C (DOWN ARROW) 4 (DOWN ARROW) - TO C (DOWN ARROW) 6 (DOWN ARROW) HYDROCARBONS AND NEW CYCLIC FLUORED HYDROGENED FUEL SOURCES (4) - UP TO C (DOWN ARROW) 6 (DOWN ARROW) HYDROCARBONS AS A FLUID GAS AND WORKING LIQUID FOR HEAT PUMP SYSTEMS |
WO1989012614A1 (en) * | 1988-06-23 | 1989-12-28 | E.I. Du Pont De Nemours And Company | Catalyzed hydrofluorination of alkenes |
US4902838A (en) * | 1988-12-28 | 1990-02-20 | E. I. Du Pont De Nemours And Company | Isomerization of saturated fluorohydrocarbons |
US4947881A (en) * | 1989-02-24 | 1990-08-14 | Allied-Signal Inc. | Method of cleaning using hydrochlorofluorocarbons |
US5053155A (en) * | 1989-12-19 | 1991-10-01 | E. I. Du Pont De Nemours And Company | Compositions and process for use in refrigeration |
US5059728A (en) * | 1990-06-29 | 1991-10-22 | Allied-Signal Inc. | Partially fluorinated alkanes having a tertiary structure |
US5073290A (en) * | 1990-08-17 | 1991-12-17 | E. I. Du Pont De Nemours And Company | Compositions of 1,1,1,2,2,5,5,5-octafluoro-4-trifluormethypentane and use thereof for cleaning solid surfaces |
US5064559A (en) * | 1990-10-11 | 1991-11-12 | E. I. Du Pont De Nemours And Company | Binary azeotropic compositions of (CF3 CHFCHFCF2 CF3) with methanol or ethanol or isopropanol |
US5064560A (en) * | 1990-10-11 | 1991-11-12 | E. I. Du Pont De Nemours And Company | Ternary azeotropic compositions of 43-10mee (CF3 CHFCHFCH2 CF.sub. |
US5171902A (en) * | 1990-10-11 | 1992-12-15 | E. I. Du Pont De Nemours And Company | Saturated linear polyfluorohydrocarbons, processes for their production, and their use in cleaning compositions |
US5162594A (en) * | 1990-10-11 | 1992-11-10 | E. I. Du Pont De Nemours And Company | Process for production of polyfluoroolefins |
-
1991
- 1991-05-06 US US07/695,826 patent/US5250213A/en not_active Expired - Fee Related
-
1992
- 1992-04-29 WO PCT/US1992/003323 patent/WO1992019706A2/en active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0431458A1 (en) * | 1989-12-07 | 1991-06-12 | Daikin Industries, Limited | Cleaning composition |
US5076956A (en) * | 1990-11-29 | 1991-12-31 | E. I. Du Pont De Nemours And Company | Compositions of octafluorotrifluoromethylpentane and nonafluorotrifluoromethylpentane and use thereof for cleaning solid surfaces |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995019947A1 (en) * | 1994-01-21 | 1995-07-27 | Alliedsignal Inc. | Hydrofuoroalkanes as cleaning and degreasing solvents |
US5696307A (en) * | 1994-01-21 | 1997-12-09 | Alliedsignal Inc. | Hydrofluoroalkanes as cleaning and degreasing solvents |
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WO1992019706A3 (en) | 1993-01-07 |
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