摘要 |
A thermoplastic resin composition for lamp housings, which comprises: a graft resin toughened with an acrylic rubbery polymer; and an a-methylstyrene copolymer that contains 25 to 85% by mass of structural units derived from a-methylstyrene. The graft resin is a resin obtained by polymerizing a vinyl monomer component that comprises both an aromatic vinyl compound and a vinyl cyanide compound in the presence of an acrylic rubbery polymer that has a gel content of 70% by mass or more, a degree of swelling in toluene of 5.5 to 30 times, a volume-mean particle diameter of 100 to 200nm, and a ratio of volume-mean particle diameter to number-mean particle diameter of less than 1.1. |