Patent ID: 7285579
Filing Date: 2007-10-23
Classification: C08G,C08K,C08L,C09D,Y10T

Abstract:
1. A clear coating composition comprising from about 90 to about 100 parts by weight of a base resin; from 0 to about 3 parts by weight of an adhesion promoter; and from about 2 to about 10 parts by weight of a cationic polymerization initiator, based on the total weight of the composition, wherein said base resin comprises: (A) from about 30 to about 55 parts by weight of a cycloaliphatic epoxy functional siloxane monomer having structure (IA) (B) from about 5 to about 30 parts by weight of a cycloaliphatic epoxy functional siloxane oligomer having structure (IB) wherein m is an integer having a value from 5 to 50; (C) from about 20 to about 55 parts by weight of at least one non-silicon-containing epoxy resin selected from the group consisting of (i) epoxidized vegetable oils, (ii) epoxidized vegetable oil esters, and (iii) 3,4-epoxycyclohexylmethyl-3′,4′-epoxycyclohexane carboxylate having structure (IIA) and (D) from 0 to about 60 parts by weight of one or more flexibilizers; wherein said cationic polymerization initiator is selected from the group consisting of (i) at least one sulfonium salt catalyst in solution with a first carrier medium; (ii) a diaryliodonium salt catalyst in solution with a second carrier medium; and (iii) mixtures of (i) and (ii).