Ultraviolet curable epoxy silicone coating compositions
AssigneeGeneral Electric Company
InventorsRichard P. Eckberg, Ronald W. LaRochelle
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Abstract
Epoxy functional diorganosiloxane fluids are combined with bis-aryl iodonium salts, particularly linear alkylate bis-dodecylphenyl iodonium salts to form a silicone coating composition effective for rendering surfaces non-adherent to other surfaces which would normally adhere thereto, and which will cure to a final non-adherent state upon brief exposure to ultraviolet radiation. Adhesion of the silicone coating to a substrate can be improved with the addition of .beta.-(3,4-epoxycyclohexyl)ethyltrimethoxy silane.
Claims8
An ultraviolet-curable silicone coating composition comprising:
- (a) a one-crosslinked epoxy functional dialkyl epoxy chainstopped polydialkyl-alkyl epoxy siloxane copolymer silicone intermediate fluid having a viscosity of approximately 10 to 10,000 centipoise at 25.degree. C.;
- and (b) an amount of bis-(aryl) iodonium salt having the following formula, ##STR5## wherein X is selected from the group consisting of SbF.sub.6, AsF.sub.6, PF.sub.6, and BF.sub.4, and wherein R is a C.sub.(4-20) organo radical selected from the group consisting of alkyl and haloalkyl radicals and mixtures thereof and n is a whole number equal to 1 to 5 inclusive, which is effective for catalyzing an ultraviolet light initiated cure reaction of said polydiorganosiloxane silicone intermediate fluid.
A process for providing an ultraviolet curable silicone coating composition comprising mixing a pre-crosslinked epoxy functional polydiorganosiloxane silicone intermediate fluid having a viscosity of approximately 10 to 10,000 centipoise at 25.degree. C. with an amount of bis-(4-dodecylphenyl)iodonium salt having the formula, ##STR7## wherein X is selected from the group consisting of SbF.sub.6, AsF.sub.6, PF.sub.6 and BF.sub.4, which is effective for catalyzing an ultraviolet light initiated cure reaction of said polydiorganosiloxane silicone fluid.
Dependencies are inferred from the claim text.