| 摘要 |
PROBLEM TO BE SOLVED: To improve the deformation of a molded item made of a rubber- reinforced polystyrene resin or the deformation or unevenness of printing in forming a pattern on the item by laser printing by compounding a rubber- reinforced polystyrene resin with a rubber particle orientation adjusting agent and a filler having a color changeable by laser irradiation. SOLUTION: This compsn. contains 100 pts.wt. rubber-reinforced polystyrene resin having a rubber content of 2-10wt.%, 0.5-2.5 pts.wt. rubber particle orientation adjusting agent, and 0.1-5.0 pts.wt. filler having a color changeable by laser irradiation. Pref. examples of the filler are titanium dioxide and carbon black. The adjusting agent pref. has a wt. average mol.wt. of 200-20,000, examples being a mineral oil, a paraffin oil, and a styrene oilgomer having a degree of polymn. of 2-3. |
