公开(公告)号：US4200593A

公开(公告)日：1980-04-29

申请号：US925626

申请日：1978-07-17

申请人： Jozef L. M. van der Loos ,  Wilhelmus G. Duijzings

发明人： Jozef L. M. van der Loos ,  Wilhelmus G. Duijzings

IPC分类号： C08F2/00 ,  C08F2/16 ,  C08F2/18 ,  C08F212/00 ,  C08F212/06 ,  C08F212/10 ,  C08F220/00 ,  C08F220/42 ,  C08F279/00 ,  C08F279/04 ,  C08L9/00

CPC分类号： C08F2/18 ,  C08F279/04

摘要： An improved process for the preparation of copolymers by the polymerization of from about 25 to 85 parts by weight of a styrene and/or .alpha.-methylstyrene monomer together with about 15-75 parts by weight of acrylonitrile and/or methacrylonitrile monomer in an aqueous dispersion in the presence of a compound yielding free radicals is disclosed whereby the quantity of monomer remaining in the copolymer after polymerization is substantially reduced. A compound yielding water-soluble free radicals is added to the aqueous reaction medium, containing copolymer as well as non-converted monomer, in a quantity of between about 0.05 and 2.5 parts per 100 parts by weight of monomer and copolymer present in the reaction medium, at a point of time at which (a) the rate of conversion of monomer to copolymer is less than 15% per hour, (b) the degree of conversion of monomer to copolymer is greater than 75%, and (c) at least 0.1 weight percent of non-converted acrylonitrile and/or methacrylonitrile relative to the total weight of the reaction medium, remains in the reaction medium, and whereafter no additional monomer is added.

摘要翻译： 通过将约25至85重量份的苯乙烯和/或α-甲基苯乙烯单体与约15-75重量份的丙烯腈和/或甲基丙烯腈单体在水分散体中聚合制备共聚物的改进方法 公开了在产生自由基的化合物的存在下，聚合后残留在共聚物中的单体的量显着降低。 将含有共聚物和未转化的单体的水溶性自由基化合物加入含有共聚物和非转化单体的水性反应介质中，每100份重量的单体和存在于反应介质中的共聚物为约0.05至2.5份 在（a）单体向共聚物的转化率小于15％/小时的时间点，（b）单体向共聚物的转化率大于75％，（c）至少 0.1重量％的未转化的丙烯腈和/或甲基丙烯腈相对于反应介质的总重量保留在反应介质中，此后不加入另外的单体。