Patent ID: 8569403

Claim:
A thermoplastic resin composition for a light reflector comprising: a thermoplastic resin (A); and barium sulfate; wherein a content of the barium sulfate is 2 to 45 parts by mass per 100 parts by mass of the thermoplastic resin (A), a refractive index α of the barium sulfate is from 1.61 to 2.5 and an average particle diameter of the barium sulfate is from 0.05 to 1 μm; the thermoplastic resin (A) comprises: polybutylene terephthalate; polyethylene terephthalate; and from 4 to 10 mass % of at least one vinyl copolymer thermoplastic resin selected from the group of vinyl thermoplastic resins consisting of an acrylonitrile-styrene copolymer resin having a mass ratio of acrylonitrile to styrene of from 20/80 to 45/55, an epoxy group containing acrylonitrile-styrene copolymer resin having a % by mass composition of 0.1 to 0.4% glycidyl methacrylate, 15 to 40% acrylonitrile and 60 to 84.9% styrene and a maleimide copolymer resin of N-phenyl maleimide/styrene/acrylonitrile having 15 to 60 mass % N-phenyl maleimide; wherein a mass ratio of polybutylene terephthalate to polyethylene terephthalate is from 95/5 to 55/45.