	US 7,615,594 B2
	Graft copolymers and impact-resistant flame-retardant resin compositions containing the same
Tomomichi Hashimoto, Osaka (Japan); Kazunori Saegusa, Osaka (Japan); Hiroshi Tsuneishi, Osaka (Japan); Nobuo Miyatake, Hyogo (Japan); and Akira Takaki, Osaka (Japan)
Assigned to Kaneka Corporation, Osaka-Shi (Japan)
Appl. No. 10/466,130 PCT Filed Feb. 17, 2003, PCT No. PCT/JP03/01622 § 371(c)(1), (2), (4) Date Sep. 27, 2004, PCT Pub. No. WO03/068835, PCT Pub. Date Aug. 21, 2003.
Claims priority of application No. 2002-038664 (JP), filed on Feb. 15, 2002; and application No. 2002-133077 (JP), filed on May 08, 2002.
Prior Publication US 2005/0038149 A1, Feb. 17, 2005
Int. Cl. C08F 283/12 (2006.01)

U.S. Cl. 525—105 [525/464]

22 Claims

1. 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.