| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a laser marking thermoplastic copolymer composition which can provide a soft molded product that is excellent in white coloring; and a soft molded product furnished with a white marking part by laser marking. <P>SOLUTION: The laser marking thermoplastic copolymer composition comprises (A) the acrylic base copolymer and (B) a black substance for receiving laser ray to extinguish or change color by itself, wherein the black substance (B) has 0.01-10 pts. by mass relative to 100 pts. by mass of the acrylic base copolymer (A), and the acrylic base copolymer (A) consists of 30-80% by mass of methyl methacrylate (a-1), 20-70% by mass of the other methacrylate (a-2) than the methyl methacrylate (a-1), and 0-50% by mass of the other monomer (a-3), provided [(a-1)+(a-2)+(a-3)=100% by mass]. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
