Solventless release compositions, methods and articles of manufacture
AssigneeGeneral Electric Company
InventorRichard P. Eckberg
Life of this patent
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Abstract
A solventless release coating composition is provided as well as a method for rendering materials nonadherent to other materials which would normally adhere thereto. The coating composition is a platinum-metal-complex catalyzed silicone composition comprising a vinyl or silanol functional polysiloxane base polymer and a methylhydrogen crosslinking agent. Diallylmaleate is added to the composition in order to extend the useful shelf-life of the product by inhibiting any premature crosslinking reactions; the useful pot-life at ambient temperatures of the catalyzed composition can also be extended.
Claims20
A silicone composition comprising:
- (a) a diorganopolysiloxane base polymer having up to approximately 20% by weight alkenyl or silanol functional groups and having a viscosity ranging from approximately 50 to approximately 100,000 centipoise at 25.degree. C.;
- (b) a polymethylhydrogen siloxane fluid crosslinking agent having up to approximately 100% by weight SiH groups and having a viscosity in the range of approximately 25 to approximately 1000 centipoise at 25.degree. C.;
- (c) an effective amount of precious metal catalyst for facilitating an addition cure hydrosilation reaction between said base polymer and said crosslinking agent;
- and
- (d) an amount of dialkyl carboxylic ester containing carbon to carbon unsaturation effective to inhibit the precious metal catalyzed hydrosilation cure reaction of said silicone composition at temperatures below the heat cure temperature of said silicone composition.
A solventless coating composition for rendering a material nonadherent to normally adherent other materials comprising:
- (a) a vinyl chainstopped diorganopolysiloxane base polymer having the formula ##STR5## wherein R is a monovalent hydrocarbon radical free of unsaturation, R' is a hydrocarbon radical having alkenyl unsaturation, X and Y are positive integers so that the vinyl chainstopped diorganopolysiloxane has from approximately 0% to approximately 20% by weight R' groups, and having a viscosity ranging from approximately 50 to approximately 100,000 centipoise at 25.degree. C.;
- (b) a trimethyl chainstopped polymethylhydrogen siloxane fluid crosslinking agent having from approximately 10% to approximately 100% by weight SiH groups and having a viscosity in the range of approximately 25 to approximately 1000 centipoise at 25.degree. C.;
- (c) an effective amount of platinum catalyst for facilitating heat curing of said composition;
- and
- (d) an amount of diallylmaleate effective to inhibit the cure of said coating composition at temperatures below the heat cure temperature of said composition.
A method for rendering a material nonadherent to normally adherent other materials comprising applying to the first said material an amount of solventless composition comprising:
- (a) a diorganopolysiloxane base polymer having up to approximately 20% by weight alkenyl or silanol functional groups and having a viscosity ranging from approximately 50 to approximately 100,000 centipoise at 25.degree. C.;
- (b) a polymethylhydrogensiloxane fluid crosslinking agent having up to approximately 100% by weight SiH groups and having a viscosity in the range of approximately 25 to approximately 1000 centipoise at 25.degree. C.;
- (c) an effective amount of precious metal catalyst for facilitating an addition cure hydrosilation reaction between said base polymer and said crosslinking agent;
- and
- (d) an amount of dialkyl carboxylic ester containing carbon to carbon unsaturation effective to inhibit the precious metal catalyzed hydrosilation cure reaction of said silicone composition at temperatures below the heat cure temperature of said silicone composition.
A method for rendering a material nonadherent to normally adherent other materials comprising applying to the first said material an amount of a solventless composition comprising:
- (a) a vinyl chainstopped diorganopolysiloxane base polymer having the formula ##STR7## where R is a monovalent hydrocarbon radical free of unsaturation, R' is a hydrocarbon radical having alkenyl unsaturation, X and Y are positive integers so that the vinyl chain-stopped diorganopolysiloxane has from approximately 0% to approximately 20% by weight of R' groups and the viscosity of the polysiloxane ranges from approximately 50 to approximately 100,000 centipoise at 25.degree. C.;
- (b) trimethyl chainstopped polymethylhydrogen siloxane fluid crosslinking agent having from approximately 10% to approximately 100% SiH groups and having a viscosity in the range of approximately 25 to approximately 1000 centipoise at 25.degree. C.;
- (c) an effetive amount of platinum catlyst for facilitating heat curing of said composition;
- and
- (d) an amount of diallylmaleate effective to inhibit the cure of said coating composition at temperatures below the heat cure temperature of said composition.
Dependencies are inferred from the claim text.