US4526953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified silicone release coating compositions
Assignee: General Electric Co
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Filing: 1983-10-03
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Granted: 1985-07-02
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Expires: 2003-10-03
Abstract
Abstract Addition curable silicone release compositions comprised of a vinyl-functional base polymer, a cross-linking agent, a precious metal catalyst, and an effective amount of C 4 -C 30 α-olefins are provided which allow reduction in the amount of catalyst or allow the use of vinyl-containing polymers having a lower degree of functionality. The compatibility of the α-olefin additives allows the preparation of a wide range of serviceable release coating compositions at reduced cost and improved efficiency.
Inventors
- 👤 Anthony J. Dallavia, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:35
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/01; C08L; C08L83/00; C08L83/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
125 words
A solventless silicone release coating composition comprising: (A) an addition curable alkenyl functional diorganopolysiloxane base polymer having up to about 20 percent by weight alkenyl functional groups and having a viscosity of from about 50 to 100,000 cps at 25° C.; (B) a SiH-containing polysiloxane crosslinking agent having up to about 100 percent by weight SiH-containing siloxy groups and having a viscosity in the range of about 15 to 1000 cps at 25° C.; (C) an effective amount of precious metal or precious metal complex catalyst to promote an addition cure hydrosilation reaction between said base polymer and said crosslinking agent; and (D) an amount of α-olefin, or a mixture of olefins, having up to about 30 carbon atoms, effective to enhance said addition cure.
Claim 2
Dependent Claim
125 words
A solventless silicone release coating composition comprising: (A) an addition curable alkenyl functional diorganopolysiloxane base polymer having up to about 20 percent by weight alkenyl functional groups and having a viscosity of from about 50 to 100,000 cps at 25° C.; (B) a SiH-containing polysiloxane crosslinking agent having up to about 100 percent by weight SiH-containing siloxy groups and having a viscosity in the range of about 15 to 1000 cps at 25° C.; (C) an effective amount of precious metal or precious metal complex catalyst to promote an addition cure hydrosilation reaction between said base polymer and said crosslinking agent; and (D) an amount of α-olefin, or a mixture of olefins, having up to about 30 carbon atoms, effective to enhance said addition cure.
Claim 3
Dependent Claim
37 words
A composition as defined in claim 1, wherein said α-olefins are linear hydrocarbons of the formula, CH 3 --(CH 2 ) x --CH═CH 2 , wherein x is a positive integer of from 1 to 27, inclusive.
Claim 4
Dependent Claim
19 words
A composition as defined in claim 2, wherein x is a positive integer of from 13 to 27, inclusive.
Claim 5
Dependent Claim
67 words
A composition as defined in claim 1, wherein said diorganopolysiloxane has the formula ##STR3## wherein R is, independently, a monovalent hydrocarbon radical free of unsaturation having up to about 8 carbon atoms; R' is a hydrocarbon radical having alkenyl unsaturation of from 2 to 20 carbon atoms; and m and n are positive integers such that said diorganopolysiloxane has up to about 20% by weight R' groups.
Claim 6
Dependent Claim
22 words
A composition as defined in claim 4, wherein said diorganopolysiloxane is a dimethylvinyl-chainstopped polydimethylsiloxane, dimethylvinyl-chainstopped polydimethyl-methylvinyl siloxane copolymer, or a mixture thereof.
Claim 7
Dependent Claim
89 words
A composition as defined in claim 4, which also includes at least 1 additional component selected from the group consisting of (i) an amount of dimethylvinyl-chainstopped polydimethyl-methylvinylsiloxane copolymer gum having an average molecular weight of about 200,000-400,000 effective for accelerating the cure of said addition curable composition; (ii) an amount of dialkyl carboxylic ester effective to inhibit the precious metal catalyzed hydrosilation cure reaction of said silicone composition at temperatures below the heat cure temperature of the composition; (iii) controlled release additive; (iv) anti-microbial agent; and (v) anti-foaming agent.
Claim 8
Dependent Claim
25 words
A composition as defined in claim 6, wherein said crosslinking agent is a polymethylhydrogen siloxane fluid having at least 1 weight percent hydrogen as hydrogen.
Claim 9
Dependent Claim
27 words
A composition as defined in claim 7, wherein said precious metal catalyst is present in an amount sufficient to provide 10 to 500 ppm of precious metal.
Claim 10
Dependent Claim
20 words
A composition as defined in claim 8, wherein said α-olefin or mixture is comprised of C 16 -C 30 α-olefins.
Claim 11
Dependent Claim
28 words
A composition as defined in claim 9, wherein said α-olefin component is present in an amount of up to about 40 percent by weight of the total composition.
Claim 12
Dependent Claim
23 words
A composition as defined in claim 1, wherein said α-olefin or mixture of α-olefin is comprised of C 4 to C 30 α-olefins.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-01 | 1988-12-31 | 1989-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-01 | 1992-12-31 | 1993-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-01 | 1996-12-31 | 1997-07-02 | $7700.00 | Window Closed / Lapsed |