Patent ID: 6962948
Filing Date: 2005-11-08
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 2 parts by weight of an adhesion promoter; and from about 3 to about 8 parts by weight of a cationic polymerization initiator, wherein said base resin comprises: (A) from about 30 to about 50 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 50 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) (D) from 0 to about 30 parts by weight of one or more flexibilizers selected from the group of (i) epoxides based on a diglycidyl ether of bisphenol A having structure (IIB) wherein the average value of n is 0 or about 0.07, 0.14, 2.3 or 4.8; (ii) epoxidized alpha olefins; (iii) limonene oxides; (iv) thermoplastic acrylic resins; (v) elastomers; (vi) phenoxy resins; (vii) polyol flexibilizers; and (viii) allyl ethers; and wherein said cationic polymerization initiator comprises at least one diaryliodonium salt, wherein each said diaryliodonium salt is present in a corresponding separate catalyst solution comprising from about 40 to about 80 wt. % of a carrier medium and from about 20 to about 60 wt. % of said diaryliodonium salt, and wherein each said diaryliodonium salt has structure (III) wherein R is methyl or hydrogen; y is 0 or an integer from 1 to 25; and A − is a non-nucleophilic anion selected from the group consisting of [BF 4 ] − , [PF 6 ] − , [AsF 6 ] − , [SbF 6 ] − , [B(C 6 F 5 ) 4 ] − , and [Ga(C 6 F 5 ) 4 ] − .