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

A powder comprising a polyorganosiloxane-containing graft copolymer (G2) obtained by graft polymerizing one or more vinyl monomers on a polyorganosiloxane-based rubber, wherein a particle diameter of the polyorganosiloxane-containing graft copolymer (G2) measured with absorptiometry is 300 nm to 2000 nm, an alkali metal content of the powder is 0 ppm to 20 ppm, and an alkaline earth metal content of the powder is 0 ppm to 150 ppm,

• wherein a resin composition comprising the polyorganosiloxane-containing graft copolymer (G2) is prepared under production condition 11 and has a number of generated silver streaks measured under an evaluation condition 12 of 0,
• wherein the production condition 11 for the resin composition and a test piece comprises:
• mixing the following (1)-(5):
• (1) 4 mass parts of the powder of the polyorganosiloxane-containing graft copolymer (G2);
• (2) 96 mass parts of an aromatic polycarbonate resin having a viscosity average molecular weight of 22,000;
• (3) 0.1 mass part of octadecyl 3,5-di-t-butyl-4-hydroxylbenzene propionate;
• (4) 0.1 mass part of tris(2,4-di-t-butylphenyl)phosphite;
• and
• (5) 0.1 mass part of carbon black having primary particle size of 16 nm, nitrogen absorption surface area of 260 m2/g, tinting strength of 147%, and powder oil absorption of 69 cm3/100 g;
• providing the mixture to a devolatilizing extruder heated to a barrel temperature of 280° C.;
• kneading the mixture under a condition of a screw speed of 150 rpm to obtain particles of the resin composition;
• molding the particles under conditions of a material cylinder temperature of 310° C., a hot runner temperature of 310° C., and a mold temperature of 90° C. using a 100 ton injection molding machine and a mold having a hot runner (test piece dimensions:
• longitude:
• 100 mm×transverse:
• 100 mm×thickness:
• 2 mm, pin gate) to produce an injection molded article of a first shot;
• and
• molding after the first-shot molding of the injection molding machine and after the resin composition is kept in the injection molding machine for 6 min to perform another shot of molding to obtain a test piece 11;
• wherein the evaluation condition 12 comprises:
• visually confirming a number of silver streaks generated near a gate of the test piece 11.