PROCESS FOR PRODUCING MALEIMIDE COPOLYMER AND THERMOPLASTIC RESIN COMPOSITION COMPRISING THE COPOLYMER
申请人:MITSUBISHI RAYON CO., LTD.
公开号:EP0222924A1
公开(公告)日:1987-05-27
A process for producing a maleimide copolymer by emulsion polymerization of an aromatic vinyl monomer, a vinyl cyanide monomer, and a maleimide monomer in a specific mixture ratio, which comprises feeding an aromatic vinyl monomer in an amount more than a specified amount and, if necessary, a vinyl cyanide in an amount less than a specified amount before initiation of the polymerization, and adding continuously or by portions thereto, after initiation of the polymerization, the rest of the monomer mixture including the whole amount of a maleimide monomer, while keeping the pH of the aqueous phase of the polymerization system at 3 to 9 upon initiation of polymerization and using a redox catalyst comprising an oil-soluble organic peroxide. This process provides a maleimide copolymer having good heat resistance and heat decomposition resistance in a high yield. A thermoplastic resin composition prepared by compounding the maleimide copolymer with a rubber reinforced resin obtained by grafting a vinyl cyanide monomer to a specified elastomer in a specified proportion, which may optionally be further blended with a thermoplastic resin hard at room temperature, is also disclosed. The resin composition has excellent heat resistance, heat decomposition resistance, and impact resistance.
一种通过芳香族乙烯基单体、乙烯基氰化物单体和马来酰亚胺单体按特定混合比进行乳液聚合生产马来酰亚胺共聚物的工艺,该工艺包括在开始聚合之前加入一定量的芳香族乙烯基单体,必要时加入一定量的乙烯基氰化物,其加入量小于规定量、聚合开始后,连续或分次加入其余的单体混合物,包括全量的马来酰亚胺单体,同时在聚合开始时保持聚合体系水相的 pH 值为 3 至 9,并使用由油溶性有机过氧化物组成的氧化还原催化剂。该工艺可提供一种具有良好耐热性和耐热分解性的马来酰亚胺共聚物,且产量高。此外,还公开了一种热塑性树脂组合物,其制备方法是将马来酰亚胺共聚物与通过将乙烯基氰化单体按特定比例接枝到特定弹性体而获得的橡胶增强树脂进行共混,该橡胶增强树脂可选择与在室温下变硬的热塑性树脂进一步共混。该树脂组合物具有优异的耐热性、耐热分解性和耐冲击性。