Polyorganosiloxane-containing graft copolymer, thermoplastic resin composition, and molded product

A polyorganosiloxane-containing graft copolymer, which provides a molded product having the following properties described in (1) to (3):

• (1) a Charpy impact strength at −30° C. of 20 kJ/m2 or more,
• (2) a L* value of 8 or less, and
• (3) a flame retardance of V1 or V0;
• wherein the Charpy impact strength, the L* value, and the flame retardance are measured under the following conditions:
• preparing test piece 1, test piece 2, and test piece 3, respectively, according to the following manufacturing conditions:
• manufacturing conditions of the test piece 1 and the test piece 2:
• (a) the polyorganosiloxane-containing graft copolymer is 3 parts by mass,
• (b) an aromatic polycarbonate resin having a viscosity-average molecular weight of 24,000 is 97 parts by mass,
• (c) n-octadecyl-3-(3′,5′-di-tert-butyl-4′-hydroxyphenyl)propionate is 0.1 parts by mass,
• (d) tris(2,4-di-tert-butylphenyl)phosphite is 0.1 parts by mass, and
• (e) carbon black is 0.1 parts by mass,
• where the materials (a) to (e) are prepared, mixed and extruded under a conditions of a screw rotation speed of 150 rpm via a devolatilizing extruder heated to a roller temperature of 280° C. to obtain particles, which are then molded via a 100 t injection molding machine under conditions of a barrel temperature of 280° C. and a mold temperature of 90° C. to obtain the test piece 1 (length:
• 80 mm, width:
• 10 mm, thickness:
• 4 mm, with a V-notch) and the test piece 2 (length:
• 100 mm, width:
• 50 mm, thickness:
• 2 mm);
• manufacturing conditions of test piece 3:
• (a) the polyorganosiloxane-containing graft copolymer is 5 parts by mass,
• (b) an aromatic polycarbonate resin having a viscosity-average molecular weight of 24,000 is 90 parts by mass,
• (e) carbon black is 0.1 parts by mass,
• (f) flame retardant [(CH3)2C6H3O]2P(O)OC6H4OP(O)[OC6H3(CH3)2]2 is 5 parts by mass,
• (g) a polytetrafluoroethylene-containing powder is 1 part by mass,
• where the materials (a), (b), (e), (f), and (g) are prepared, mixed and extruded under a conditions of a screw rotation speed of 150 rpm via a devolatilizing extruder heated to a roller temperature of 280° C. to obtain particles, which are then molded via a 100 t injection molding machine under conditions of a barrel temperature of 280° C. and a mold temperature of 90° C. to obtain the test piece 3 (length:
• 127 mm, width:
• 12.7 mm, thickness:
• 1.6 mm);
• measurement conditions of Charpy impact strength:
• measure the Charpy impact strength of the test piece 1 placed in an environment of −30° C. for 12 hours or more according to a method of International Standard Organization 179;
• measurement conditions of L* value:
• measure tristimulus values (XYZ) of the test piece 2 according to the measurement conditions of Japanese Industrial Standard Z8722, and then calculate a L* value using an International Commission on Illumination color difference formula,
• where the measurement is conducted on a spectroscopic colorimeter using a method of after-sample light splitting of 0° to 45°, with a measurement range of 380 nm to 780 nm, and a C light (2° field of view) as a measurement light source;
• measurement conditions of flame retardance:
• measure the flame retardance of the test piece 3 according to UL-94V (vertical flame test).