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Publication numberCA2545203 A1
Publication typeApplication
Application numberCA 2545203
PCT numberPCT/US2004/037875
Publication date2 Jun 2005
Filing date12 Nov 2004
Priority date14 Nov 2003
Also published asCA2545203C, CA2546075A1, CA2546075C, CN1878799A, CN1878799B, CN1890276A, CN1890276B, EP1687345A1, EP1687345B1, EP1687346A1, EP1687346B1, US7390866, US7605217, US7928165, US8013093, US20050107529, US20050107530, US20050107534, US20050131142, WO2005049670A1, WO2005049671A1, WO2005049672A1
Publication numberCA 2545203, CA 2545203 A1, CA 2545203A1, CA-A1-2545203, CA2545203 A1, CA2545203A1, PCT/2004/37875, PCT/US/2004/037875, PCT/US/2004/37875, PCT/US/4/037875, PCT/US/4/37875, PCT/US2004/037875, PCT/US2004/37875, PCT/US2004037875, PCT/US200437875, PCT/US4/037875, PCT/US4/37875, PCT/US4037875, PCT/US437875
InventorsSudhin Datta, Abdelhadi Sahnoune
ApplicantExxonmobil Chemical Patents Inc., Sudhin Datta, Abdelhadi Sahnoune
Export CitationBiBTeX, EndNote, RefMan
External Links: CIPO, Espacenet
Transparent and translucent crosslinked propylene-based elastomers, and their production and use
CA 2545203 A1
Abstract
The present invention provides a crosslinked propylene-based elastomer having an isotactic propylene triad tacticity of from 65 to 95%, a melting point by DSC equal to or less than 110~C, a heat of fusion of from 5 J/g to 50 J/g, and a haze% per 100 mil thickness of 95 or less, and comprising at least 75 wt%
propylene-derived units, at least 5 wt% ethylene-derived units, and optionally 10 wt% or less of dime-derived units. In an embodiment, the present invention is a blend of a continuous phase of the crosslinked propylene-based elastomer and a dispersed phase of a crystalline polymeric compound. The present invention also provides elastomeric compositions comprising a crosslinked propylene-based elastomer as described herein and 100 parts by weight or less of a pigment per 100 parts of polymer. The present invention also provides films, fibers, nonwovens, molded objects, and extruded forms which include any of the inventive compositions described herein.
Description  available in
Claims(14)
1. A crosslinked elastomer comprising:
(a) propylene-derived units in an amount of at least 75 wt%, based on the combined weight of components (a), (b), and (c);
(b) ethylene-derived units in an amount of at least 5 wt%, based on the combined weight of components (a), (b), and (c); and (c) optionally 10 wt% or less of diene-derived units, based on the combined weight of components (a), (b), and (c);
wherein the elastomer has an isotactic propylene triad tacticity of from 65 to 95%, a melting point by DSC equal to or less than 110C, a heat of fusion of from 5 J/g to 50 J/g, and a haze% per 100 mil thickness of 95 or less, preferably 60 or less, more preferably 40 or less, and especially 20 or less.
2. The crosslinked elastomer according to claim 1, wherein the crosslinked elastomer of claim 1, wherein the elastomer, prior to crosslinking, has an MFR
@230C of from 0.1 to 400, and preferably from 5 to 150.
3. The crosslinked elastomer according to claim 1 or 2, wherein the crosslinked elastomer has an ultimate tensile strength of 0.5 MPa or greater.
4. The crosslinked elastomer according to any of the preceding claims, wherein the crosslinked elastomer has an ultimate tensile strength (TS), measured in MPa, of 0.5 or greater.
5. The crosslinked elastomer according to any of the preceding claims, wherein the elastomer comprises diene-derived units in an amount of from 0.3 to wt%, based on the combined weight of components (a), (b), and (c).
6. The crosslinked elastomer according to any of the preceding claims, wherein the ratio of the Shore A hardness to MFR@230C of the elastomer, prior to crosslinking, and the ultimate tensile strength (TS), measured in MPa, of the crosslinked elastomer, satisfy the following equation:
(Shore A hardness/MFR@230C)<=1.66*TS - B1, where B1 is 0, preferably 3.33, more preferably 6.66, and especially 10.
7. The crosslinked elastomer according to any of the preceding claims, wherein the crosslinked elastomer has a Die C tear strength (Die C), measured in lb force/inch, of 50 or greater.
8. The crosslinked elastomer according to any of the preceding claims, wherein the ratio of the Shore A hardness to MFR@230C of the elastomer, prior to crosslinking, and the Die C tear strength (Die C), measured in lb force/inch, of the crosslinked elastomer, satisfy the following equation:
(Shore A hardness/MFR@230C)<=0.2*Die C - B2, where B2 is 0, preferably 10, more preferably 20, and especially 30.
9. A blend composition comprising a continuous phase formed by the crosslinked elastomer of any of the preceding claims and a dispersed phase of a crystalline polymer component having a melting point by DSC of 115C or higher, and a heat of fusion of 50 J/g or higher, and is selected from the group consisting of propylene homopolymers, propylene graft copolymers, propylene block copolymers, propylene random copolymers, and mixtures thereof, and is preferably isotactic polypropylene.
10. An elastomeric composition comprising the composition according to any of the preceding claims and 100 parts by weight or less of a pigment, preferably a colored pigment, per 100 parts of polymer.
11. An article comprising the composition according to any of the preceding claims, wherein the article has a haze% per 100 mil thickness of 95 or less, preferably 80 or less, more preferably 50 or less, and especially 30 or less.
12. The article according to claim 11, wherein the article is an extruded article or a molded object.
13. The blend composition as set forth in Claim 9 wherein said blend composition has been heated to a level sufficient to melt substantially the entirety of the crystalline polymer component.
14. The blend composition as set forth in Claim 9 wherein said crystalline polymer component is isotactic polypropylene and wherein said blend has been heated to at least 150C.
Classifications
International ClassificationC08F210/18, C08L23/16, C08F4/659, C08F8/00, C08F210/06
Cooperative ClassificationY10T442/678, A43B13/04, C08F210/06, C08F4/65908, C08F210/18
European ClassificationC08F210/06, C08F210/18
Legal Events
DateCodeEventDescription
8 May 2006EEERExamination request