| 摘要 |
PROBLEM TO BE SOLVED: To obtain a resin composition which can give a molding capable of being marked with a clear white marking when irradiated with laser beams by mixing a specified rubber-containing graft copolymer with an alkyl unsaturated carboxylate copolymer, a vinyl copolymer and carbon black. SOLUTION: This composition comprises compounding 10-50 pts.wt. rubber- containing graft copolymer obtained by grafting 80-20 pts.wt. mixture comprising (a) 50-90 wt.% alkyl unsaturated carboxylate, 10-50 wt.% aromatic vinyl monomer (b), and 0-20 wt.% vinyl cyanide monomer (c) onto 20-80 pts.wt. rubbery polymer having a weight-mean particle diameter of 0.1-2.0 μm, with 10-90 pts.wt. alkyl unsaturated carboxylate copolymer comprising 50-90 wt.% component (a), 50-90 wt.% component (b), and 0-20 wt.% component (c), 0-50 pts.wt. vinyl copolymer comprising 75-35 wt.% component b, 5-40 wt.% component (c), and 0-60 wt.% other copolymerizable monomers (the total of the three components is 100 pts.wt.), and 0.001-5 pts.wt. carbon black having a mean particle diameter of 10-50 nm (as measured on primary particles). |
