| 摘要 |
PURPOSE:To improve the ratio of ring closure into a six-membered acid anhydride and obtain a copolymer having improved heat deformation resistance and moldability, by adding a ring closure promoter selected from basic compounds to a copolymer consisting of vinyl monomer units. CONSTITUTION:A copolymer consisting of vinyl monomer units containing prefereably 5-50wt% (meth)acrylic acid units (hereinafter referred to as a base copolymer) is subjected to ring closure by heat-treating normally at 220-320 deg.C. In the process, 0.001-1wt% one or more ring closure promoters selected from basic compounds, e.g. KOH, triethylamine or 2- phenylmethylimidazole, are present in the above-mentioned base copolymer to afford the aimed copolymer having normally 5-30wt% six-membered acid anhydride units. USE:Used for automotive parts, electric-related parts, etc. |
