| 摘要 |
PROBLEM TO BE SOLVED: To provide a flame-retardant thermoplastic resin composition being excellent not only in flame retardancy but also in weather resistance, impact resistance, fluidity and a color-developing property.SOLUTION: A flame-retardant thermoplastic resin composition is produced by compounding 100 pts.wt. of a resin composition including a graft copolymer (A) and a copolymer (B) with 1 to 40 pts.wt. of a flame retardant (C). The graft copolymer (A) is produced by graft polymerization of 20 to 90 pts.wt. of at least one monomer selected from an aromatic vinyl monomer, a vinyl cyanide-based monomer, and another vinyl monomer copolymerizable therewith to 10 to 80 pts.wt. of a composite rubber comprising 5 to 50 wt.% of a conjugated diene-based rubbery polymer and 50 to 95 wt.% of a crosslinked acrylic acid ester-based polymer. In the graft copolymer, a tetrahydrofuran-soluble fraction in the composite rubber has a weight average molecular weight of 50,000 or more in terms of polystyrene, and a degree of swelling of the composite rubber in toluene is 7.0 or more. The copolymer (B) is a copolymer obtained by copolymerizing an aromatic vinyl monomer and a vinyl cyanide-based monomer, and if necessary another copolymerizable vinyl monomer with one another. |
