US4608312A
Expired / Lapsed
US
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Ultraviolet radiation curable silicone release compositions
Assignee: General Electric Co
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Filing: 1985-07-19
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Granted: 1986-08-26
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Expires: 2005-07-19
Abstract
Abstract Novel UV-curable silicone release coating compositions and photocatalysts therefor are provided which include mercaptoalkoxyalkyl-functional polysiloxanes and vinyl-functional photoreactive terpolymers, both of which are especially compatable with certain perbenzoate ester photocatalysts. The addition of certain polyaromatic photosensitizers to enhance cure is also disclosed.
Inventors
- 👤 Richard P. Eckberg
- 👤 Richard A. Striker
- 👤 Frank J. Modic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:40
CPC Classifications
C; C09; C09D; C09D183/00; C09D183/04; C09D183/08; C08; C08G; C08G77/00; C08G77/04; C08G77/38; C08G77/382; C08G77/392; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31533; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
153 words
An ultraviolet radiation-curable silicone release composition comprising: (A) an odor-free mercaptoalkoyalkylfunctional diorganopolysiloxane consisting essentially of units of the formula RR'SiO, wherein R is hydrogen or C.sub.(1-8) alkyl and R' is hydrogen, C.sub.(1-8) alkyl or a monovalent mercaptoalkoxyalkyl-functional organic radical of from 2 to 20 carbon atoms, said diorganopolysiloxane having up to about 50% by weight mercaptoalkoxyalkyl-functional groups and a viscosity of from about 50 to 10,000 centipoise at 25° C.; (B) a polysiloxane consisting of from about 0.5 to 100 mole percent of vinyl-functional siloxane units of the formula (CH 2 ═CH)R n SiO 3-n/2 , where R is hydrogen or C.sub.(1-8) alkyl and n has a value of 0 to 2, inclusive, any non-vinyl-containing siloxane units having the formula R 3 m SiO 4-m/2 , where R 3 is hydrogen or C.sub.(1-8) alkyl and m has a value of from 0 to 3, inclusive; and (C) a catalytic amount of a photoinitiator.
Claim 2
Dependent Claim
153 words
An ultraviolet radiation-curable silicone release composition comprising: (A) an odor-free mercaptoalkoyalkylfunctional diorganopolysiloxane consisting essentially of units of the formula RR'SiO, wherein R is hydrogen or C.sub.(1-8) alkyl and R' is hydrogen, C.sub.(1-8) alkyl or a monovalent mercaptoalkoxyalkyl-functional organic radical of from 2 to 20 carbon atoms, said diorganopolysiloxane having up to about 50% by weight mercaptoalkoxyalkyl-functional groups and a viscosity of from about 50 to 10,000 centipoise at 25° C.; (B) a polysiloxane consisting of from about 0.5 to 100 mole percent of vinyl-functional siloxane units of the formula (CH 2 ═CH)R n SiO 3-n/2 , where R is hydrogen or C.sub.(1-8) alkyl and n has a value of 0 to 2, inclusive, any non-vinyl-containing siloxane units having the formula R 3 m SiO 4-m/2 , where R 3 is hydrogen or C.sub.(1-8) alkyl and m has a value of from 0 to 3, inclusive; and (C) a catalytic amount of a photoinitiator.
Claim 3
Dependent Claim
45 words
A silicone release composition as defined in claim 1, wherein said photoinitiator is a perbenzoate ester having the formula, ##STR6## where R 4 is a monovalent alkyl or aryl group and Z is hydrogen, alkoxy, alkyl, halogen, nitro, amino, primary amino, secondary amino, or amido.
Claim 4
Dependent Claim
28 words
A silicone release coating composition as defined in claim 2, wherein said perbenzoate ester is selected from the group consisting of t-butylperbenzoate, t-butylper-p-nitrobenzoate, t-butylper-p-methoxy benzoate, t-butylper-p-methylbenzoate, and t-butylper-p-chlorobenzoate.
Claim 5
Dependent Claim
37 words
A silicone release coating composition as defined in claim 2, which includes the additional component (D) a small amount of a polyaromatic photosensitizer or a combination of such photosensitizers effective to enhance the cure of said composition.
Claim 6
Dependent Claim
27 words
A silicone release coating composition as defined in claim 4, wherein said photosensitizer component (D) is selected from the group consisting of benzophenone, t-butylanthraquinone, and combinations thereof.
Claim 7
Dependent Claim
15 words
A solid substrate coated on at least one surface with the composition of claim 1.
Claim 8
Dependent Claim
34 words
The coated substrate of claim 6, wherein said substrate is selected from the group consisting of paper, metal foil, glass, polyethylene coated kraft paper, supercalendered kraft paper, polyethylene film, polypropylene film and polyester film.
Claim 9
Dependent Claim
14 words
The coated substrate of claim 7, wherein said composition is cured on said substrate.
Claim 10
Dependent Claim
17 words
The coated substrate of claim 8, wherein said cured coating forms an abhesive surface on said substrate.
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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) | 1989-08-25 | 1990-02-24 | 1990-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-25 | 1994-02-24 | 1994-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-25 | 1998-02-24 | 1998-08-26 | $7700.00 | Window Closed / Lapsed |