| 摘要 |
PROBLEM TO BE SOLVED: To provide a blowing agent-containing master batch having a stable content of the blowing agent and a small changing rate of the content over time. SOLUTION: This blowing agent-containing master batch consists of 75 to 95 mass% monomer unit consisting of an aromatic vinyl compound, 5 to 25 mass% monomer unit consisting of a vinyl cyanide compound and 0 to 20 mass% monomer unit consisting of another vinyl-based compound based on 100 mass% total of the whole monomer units, and also contains 100 pts.mass styrene-based resin having 100,000 to 300,000 weight-average molecular weight and 2.5 to 10 pts.mass blowing agent. COPYRIGHT: (C)2008,JPO&INPIT |
