Patent ID: 7615594

Claim:
A polyorganosiloxane-containing graft copolymer which is made by Step 1: graft polymerizing a vinyl monomer (B) comprising 100 to 90% by weight of a polyfunctional monomer (b-1) containing two or more polymerizable unsaturated bonds and 0 to 10% by weight of another copolymerizable monomer (b-2) onto polyorganosiloxane particles (A1), wherein the graft polymerizing is conducted with 0.5 to 5 parts by weight of vinyl monomer (B) and 60 to 90 parts (as solid content) by weight of polyorganosiloxane particles (A1), followed by Step 2: graft polymerization of a vinyl monomer (C) onto the graft polymerization product obtained in Step 1, wherein the graft polymerizing of step 2 is conducted with 5 to 39 parts by weight of a vinyl monomer (C), and wherein the sum of (A1), (B) and (C) being 100 parts by weight, wherein the polyfunctional monomer (b-1) is at least one monomer selected from the group consisting of allyl methacrylate, triallyl cyanurate, triallyl isocyanurate, diallyl phthalate, ethylene glycol dimethacrylate, 1,3-butylene glycol dimethacrylate, and divinylbenzene.