| 摘要 |
PURPOSE:An expandable vinyl chloride resin composition which does not discolor even when it is expanded by heating in contact with a ketone compound, containing a combination of a heat-decomposable organic blowing agent and a phosphite compound. CONSTITUTION:A mixture is formed from 100pts.wt. vinyl chloride resin, about 0.5-30pts.wt. heat-decomposable organic blowing agent (e.g., azodicarbonamide), about 1-10pts.wt. blowing aid (e.g., zinc oxide) and about 0.1-5pts.wt. phosphite compound (e.g., triphenyl phosphite or tetraphenyldipropylene glycol phosphite) and is formed into a film or a sheet at a temperature in a range in which the blowing agent does not decompose. |
