THERMOPLASTIC RESIN COMPOSITION FOR LASER MARKING

摘要

PROBLEM TO BE SOLVED: To obtain a thermoplastic resin composition for laser marking excellent in heat resistance and capable of providing molded articles on which clear white marking can be made to emerge by laser beam irradiation. SOLUTION: This thermoplastic resin composition for laser marking comprises (A) a rubber-reinforced resin composed of (A1) a rubber-reinforced vinyl-based resin obtained by polymerizing at least one kind of monomer selected from the group consisting of an aromatic vinyl monomer, a vinyl cyanide monomer and a (meth)acrylic acid ester monomer in the presence of a rubber-based polymer or a mixture of (A1) the rubber-reinforced vinyl-based resin with (A2) a (co)polymer obtained by polymerizing at least one kind of monomer selected from the group consisting of the aromatic vinyl monomer, the vinyl cyanide monomer and the (meth)acrylic acid ester monomer, and (B) a maleimide-based resin obtained by polymerizing a maleimide-based monomer with a (meth)acrylic acid ester monomer. In the resin composition, the content of (meth)acrylic acid ester monomer unit is 30-80 wt.% based on the total resin contained in the components A and B.