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41. 发明授权

US4508876A Graft copolymer useful as reinforcements for vinyl chloride polymers and process for preparing the same 失效
标题翻译：用作氯乙烯聚合物增强物的接枝共聚物及其制备方法
公开(公告)号：US4508876A
公开(公告)日：1985-04-02
申请号：US511479
申请日：1983-07-07
申请人： Akira Takaki , Hideki Hosoi
发明人： Akira Takaki , Hideki Hosoi
IPC分类号： C08F279/06 , C08L27/06 , C08L51/04 , C08F279/00
CPC分类号： C08F279/06 , C08L27/06 , C08L51/04 , Y10S525/902
摘要： A MBS resin useful as a reinforcement for vinyl chloride polymers and capable of improving the impact resistance of the vinyl chloride polymers without impairing the transparency thereof, which is prepared by graft-polymerizing a monomer mixture comprising an aromatic vinyl compound and an alkyl methacrylate onto a butadiene copolymer comprising styrene and butadiene, the butadiene copolymer being present in the polymerization system in a higher proportion as compared with a conventional MBS resin and present in the form of an aqueous latex of particles having a structure such that a portion formed in the last stage of a polymerization for the preparation of the butadiene copolymer amounting to 20% by weight of the produced butadiene copolymer, has a very high butadiene content of 80 to 100% by weight and moreover has at least 5% by weight higher butadiene content than the average butadiene content of the produced butadiene copolymer.
摘要翻译：一种可用作氯乙烯聚合物增强剂并能够改善氯乙烯聚合物的耐冲击性而不损害其透明性的MBS树脂，其通过将包含芳族乙烯基化合物和甲基丙烯酸烷基酯的单体混合物接枝聚合到包含苯乙烯和丁二烯的丁二烯共聚物，丁二烯共聚物与常规的MBS树脂相比以高比例存在于聚合体系中，并以具有如下结构的颗粒的水性胶乳的形式存在，即使在最后阶段形成的部分用于制备丁二烯共聚物的聚合物的量为所制备的丁二烯共聚物的20重量％，具有非常高的丁二烯含量为80至100重量％，此外还具有比平均值高至少5重量％的丁二烯含量所生产的丁二烯共聚物的丁二烯含量。

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