UV curable non-toxic epoxysilicone release coating compositions and method

Claim 1

A method for providing nontoxic, adherent silicone release coatings which can be used in food applications comprising: (1) applying a UV curable silicone coating onto a substrate, and (2) exposing the treated substrate of (1) to UV radiation until the UV curable silicone coating is tack-free, where the UV curable epoxy silicone composition comprises by weight (A) 100 parts of epoxysilicone having from 5 to 12 mole percent epoxysiloxy units, based on the total moles of condensed diorganosiloxy units in the epoxysilicone, (B) 1 to 25 parts of a compatibilizer in the form of a mixture of (i) 1 to 25 parts of a C.sub.(8-20) alkylphenol and (ii) 0 to 15 parts of a C.sub.(4-12) alkanediol, and (C) an effective amount of a polyarylonium hexafluorometal, or metalloid salt, substituted with at least one nuclear bound alkoxy radical having at least 8 carbon atoms selected from the class consisting of diaryliodonium salts and triarylsulfonium salts and the UV curable epoxy silicone composition is a mixture prepared by initially forming a solution of the arylonium salt in the alkylphenol and alkane diol and thereafter blending the resulting solution into the epoxy silicone.

Claim 2

A method for providing nontoxic, adherent silicone release coatings which can be used in food applications comprising: (1) applying a UV curable silicone coating onto a substrate, and (2) exposing the treated substrate of (1) to UV radiation until the UV curable silicone coating is tack-free, where the UV curable epoxy silicone composition comprises by weight (A) 100 parts of epoxysilicone having from 5 to 12 mole percent epoxysiloxy units, based on the total moles of condensed diorganosiloxy units in the epoxysilicone, (B) 1 to 25 parts of a compatibilizer in the form of a mixture of (i) 1 to 25 parts of a C.sub.(8-20) alkylphenol and (ii) 0 to 15 parts of a C.sub.(4-12) alkanediol, and (C) an effective amount of a polyarylonium hexafluorometal, or metalloid salt, substituted with at least one nuclear bound alkoxy radical having at least 8 carbon atoms selected from the class consisting of diaryliodonium salts and triarylsulfonium salts and the UV curable epoxy silicone composition is a mixture prepared by initially forming a solution of the arylonium salt in the alkylphenol and alkane diol and thereafter blending the resulting solution into the epoxy silicone.