Silicone-acrylic copolymer

Abstract

A novel silicone-acrylic copolymer which comprises a covalently bonded silicone polymer with an acrylic polymer through the —Si—O—Si— linkage is described. The silicone-acrylic copolymer is a reaction product of (a) a silicone polymer, (bi) a mixture of acrylic monomers wherein at least one acrylic monomer comprises a silane (meth)acrylic monomer and/or a siloxane (meth)acrylic macromer with a radical initiator to form an acrylic prepolymer or (bii) an acrylic polymer which comprises a silane or a siloxane functional group; and (c) a scrambling catalyst, wherein the ratio of the silicone polymer (a) and the mixture of acrylic monomers (bi) or polymer (bii) is from 50:1 to 1:50. The silicone-acrylic copolymer is useful as an adhesive, sealant, coating, and the like.

1 . A silicone-acrylic copolymer comprising a silicone polymer and an acrylic polymer which are covalently bonded through a —Si—O— linkage, wherein the ratio of the silicone polymer and the acrylic monomer is from 50:1 to 1:50, and the acrylic polymer contains at least one silane or siloxane functional group,
 wherein the silicone-acrylic copolymer form a single, transparent phase in an organic solvent; and 
 wherein the silane (meth)acrylic monomer and/or the siloxane (meth)acrylic macromer is in the content of about 0.2 to about 50 wt %, based on the total weight of acrylic monomers.