CA1233290A
Expired / Lapsed
CA
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Ultraviolet radiation-curable silicone release compositions
Assignee: General Electric Co
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Filing: 1984-11-30
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Granted: 1988-02-23
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Expires: 2004-11-30
Abstract
Abstract ULTRAVIOLET RADIATION-CURABLE SILICONE RELEASE COMPOSITIONS 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
CA
Data Source
google_patents
Last Synchronized
2026-11-09 13:49
CPC Classifications
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Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
162 words
-2 - The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 1. An ultraviolet radiation-curable silicone release composition comprising: (A) an odor-free mercaptoalkoxyalkyl-functional diorganopolysiloxane consisting essentially of units of the formula RR'SiO, wherein R is hydrogen or C(1-8) alkyl and R' is hydrogen, C(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.degree.C; (B) a polysiloxane consisting of from about 0.5 to 100 mole percent of vinyl-functional siloxane units of the formula (CH2=CH)RnSiO3-n/2, where R is hydrogen or C(1-8) alkyl and n has a value of 0 to 2, inclusive, any non-vinyl-containing siloxane units having the formula R3mSiO4 m/2, where R3 is hydrogen or C(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
46 words
A silicone release composition as defined in claim 1, wherein said photoinitiator is a perbenzoate ester having the formula, < IMG > where R4 is a monovalent alkyl or aryl group and Z is hydrogen, alkoxy, alkyl, halogen, nitro, amino, primary amino, secondary amino, or amido.
Claim 3
Dependent Claim
30 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, - 43 - t-butylper-p-methylbenzoate, and t-butylper-p-chlorobenzoate.
Claim 4
Dependent Claim
38 words
A silicone release coating composition as defined in claim 2, which includes the additional com- ponent (D) a small amount of a polyaromatic photosensitizer or a combination of such photosensitizers effective to enhance the cure of said composition.
Claim 5
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 6
Dependent Claim
15 words
A solid substrate coated on at least one surface with the composition of claim 1.
Claim 7
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, super-calendered kraft paper, polyethylene film, polypropylene film and polyester film.
Claim 8
Dependent Claim
14 words
The coated substrate of claim 7, wherein said composition is cured on said substrate.
Claim 9
Dependent Claim
17 words
The coated substrate of claim 8, wherein said cured coating forms an adhesive surface on said substrate.
Claim 10
Dependent Claim
95 words
An odor-free mercaptoalkoxyalkyl- functional polysiloxane capable of curing to an adhesive polymeric composition on brief exposure to ultraviolet radiation in the presence of an organic compound contain- ing ethylenic unsaturation and a catalytic amount of a photoinitiator consisting essentially of units of the formula RR'SiO, wherein R is hydrogen or C(1-8) alkyl and R' is hydrogen, C(1-8) alkyl or a monovalent mercaptoalkoxyalkyl-functional organic radical of from 2 to 20 carbon atoms, said diorganopolysiloxane having up to about 50% mercaptoalkoxyalkyl-functional groups and a viscosity of from about 50 to 10,000 centipoise at 25.degree.C. - 44 -
Claim 11
Dependent Claim
99 words
An odor-free mercaptoalkoxyalkyl-functional polysiloxane capable of curing to an adhesive polymeric composition on brief exposure to ultraviolet radiation in the presence of an organic compound containing ethylenic unsaturation and a catalytic amount of a photoinitiator, consisting essentially of the composition obtained by (1) reacting a dialkylhydrogen-chainstopped polydialkyl-alkylhydrogensiloxane copolymer with an .omega.-halo-alkene in the presence of a precious metal hydro- silation catalyst, and (2) reacting the product of (1) with a hydroxy-functional thiol of the formula HO-R"-SH, wherein R" is a divalent alkylene or alkyl ketone radical of from 2 to 20 carbon atoms in the presence of an amine.
Claim 12
Dependent Claim
25 words
An odor-free mercaptoalkoxyalkyl-functional diorganopolysiloxane as defined in claim 11, wherein said .omega.-halo-alkene is methallyl chloride and said hydroxy- functional thiol is .beta.-mercaptoethanol or .gamma.-mercaptopropionic acid.
References Cited (Backward Citations)
No citation records indexed.
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