Patent ID: 9527997
Filing Date: 2016-12-27
CPC Classification: C08F,C08G,C08K,C08L

Claim Text:
1. A polyorganosiloxane-containing graft copolymer, which is a polyorganosiloxane-containing graft copolymer (G1) formed by graft polymerizing a vinyl monomer mixture on a polyorganosiloxane-based rubber, wherein the vinyl monomer mixture contains a (meth)acrylate ester (b the (meth)acrylate ester (b a content of the polyorganosiloxane is 0.1 mass % to 69 mass % based on 100 mass % of the graft copolymer (G1), wherein regarding test pieces produced under production condition 1 below, a Charpy impact strength [kJ/m 1) 15≦Charpy impact strength≦70, 2) 60≦Charpy impact strength+total light transmittance×1.36, and 3) the flame retardance of a thickness of 1/16 inch in a vertical flame test of UL94 standard being “V-1” or above, wherein the production condition 1 for the test pieces comprises: providing a resin composition obtained by mixing 1) an aromatic polycarbonate resin having a viscosity average molecular weight of 22,000 in 100 mass parts, 2) the polyorganosiloxane-containing graft copolymer (G1) in 5.5 mass parts, 3) an acrylic acid-modified polytetrafluoroethylene in 0.5 mass part, and 4) an aromatic phosphate-based flame retardant in 5.5 mass parts to a devolatilizing extruder heated to a barrel temperature of 280° C., performing kneading under a condition of a screw speed of 150 rpm to obtain particles, providing the particles to a 100 ton injection molding machine, and performing molding under conditions of a material cylinder temperature of 280° C. and a mold temperature of 90° C. to obtain the following test pieces: i) a test piece 1 (length: 80.0 mm, width: 10.0 mm, thickness: 4 mm, provided with a V-shaped notch) provided with a Charpy notch for the impact strength evaluation, ii) a test piece 2 (length: 100 mm, width: 50 mm, thickness: 2 mm) for the total light transmittance evaluation, and iii) a test piece 3 (length: 127 mm, width: 12.7 mm, thickness: 1.6 mm) having a thickness of 1/16 inch for the flame retardance evaluation; and the evaluation condition 2 comprises: measuring the Charpy impact strength (kJ/m measuring the total light transmittance (%) of the test piece 2 to a D65 light source using a hazemeter based on JIS K 7375, and measuring, for the flame retardance, a total burn time of five test pieces 3 according to a vertical flame test method of a UL94V test.