Mitsubishi Chemical Corporation

Mitsubishi Rayon Company, Limited

Sohei Ueki

Shinji Matsuoka

Ayaka Wakita

Yuichiro Fujikawa

Hiroaki Otonari

A graft copolymer capable of providing impact resistance, flame retardance, and color rendering properties to a thermoplastic resin is described. The graft copolymer contains a polyorganosiloxane, and is obtained by graft-polymerizing vinyl monomers including a (meth)acrylate ester (b) having an alkyl group or an aromatic group and an aromatic vinyl monomer (b) on a polyorganosiloxane-based rubber. The graft copolymer has a volume average particle diameter of 200-2000 nm, and contains 0.1-69 mass % of polyorganosiloxane. A thermoplastic resin composition is also described, containing a thermoplastic resin (A), the graft copolymer, a fluorine resin (C) and a flame retardant (D). A molded article is also described, which is obtained by molding the thermoplastic resin composition.

Polyorganosiloxane-containing graft copolymer, resin composition, and molded article

The invention provides a thermoplastic resin composition, which does not substantially compromise color rendering and flame retardance of a thermoplastic resin and has high impact resistance, slidability, and chemical resistance in a wide scope of environmental conditions ranging from low temperature to high temperature. A graft copolymer (G) containing rubber is a graft copolymer containing rubber formed by performing graft polymerization of 1 or more vinyl monomers on a composite rubber containing a polyorganosiloxane (B1) and a polyalkyl (meth)acrylate (B2). The content of a component derived from a silane compound containing a vinyl-based polymerizable group in the polyorganosiloxane (B1) is 1 mass % to 10 mass %. The volume-average particle size of the graft copolymer containing rubber is 300 nm to 2000 nm. The content of the polyorganosiloxane (B1) in the graft copolymer containing rubber is 70 mass % to 98 mass %. An acetone soluble matter is 5.0 mass % or more and 30.0 mass % or less.

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Otake, Japan

Sohei Ueki