Making impact resistant polymers
    1.
    发明授权
    Making impact resistant polymers 失效
    制造耐冲击聚合物

    公开(公告)号:US4308354A

    公开(公告)日:1981-12-29

    申请号:US226008

    申请日:1981-01-19

    IPC分类号: C08F279/02 C08L51/04

    CPC分类号: C08F279/02

    摘要: What is disclosed are a method for making a transparent impact-resistant polymer comprising a rubbery phase of grafted polybutadiene and a hard copolymer phase, which polymer is adaptable to use as a molding material, which method comprises:(1) in a first polymerization stage, dissolving a solid polybutadiene rubber in a monomer mixture comprising (a) methyl methacrylate, (b) styrene, and (c) at least one of methyl acrylate or ethyl acrylate to give a solution containing from 3 to 10 percent by weight of said rubber, and then polymerizing the solution using an initiator promoting graft copolymerization and in the presence ab initio of a chain transfer agent until an amount of said monomer mixture which is one to two times the weight of said polybutadiene rubber introduced is converted, said monomers (a), (b), and (c) being present in said monomer mixture in a ratio by weight of (73.+-.5): (22.+-.2); (5.+-.3) such that the index of refraction of the hard polymer phase produced by the polymerization is equal to that of said polybutadiene, and said initiator being one forming tertiary-butoxy or phenyl free-radicals on decomposition;(2) in a second stage, further polymerizing to a monomer conversion between 25 and 40 percent while stirring to subject the resulting polymer to shear forces producing polymer particles having an average diameter between 0.2 micron and 1.5 microns; and(3) in a third stage, further polymerizing to a monomer conversion greater than 80 percent, and polymers made by such a method.

    摘要翻译: 所公开的是制备透明耐冲击聚合物的方法,该聚合物包含接枝聚丁二烯的橡胶相和硬共聚物相,该聚合物适用于模塑材料,该方法包括:(1)在第一聚合阶段 将固体聚丁二烯橡胶溶解在包含(a)甲基丙烯酸甲酯,(b)苯乙烯和(c)丙烯酸甲酯或丙烯酸乙酯中的至少一种的单体混合物中,得到含有3-10重量%的所述橡胶 然后使用促进接枝共聚的引发剂并在链转移剂的存在下使所述溶液聚合,直到所述单体混合物的量被引入的所述聚丁二烯橡胶的重量的一至二倍被转化为所述单体 ),(b)和(c)以(73 +/- 5):(22 +/- 2)的重量比存在于所述单体混合物中。 (5 +/- 3),使得通过聚合产生的硬聚合物相的折射率等于所述聚丁二烯的折射率,并且所述引发剂是在分解时形成叔丁氧基或苯基自由基的一种; (2)在第二阶段中,进一步聚合至25至40%的单体转化率同时搅拌以使得到的聚合物产生剪切力,产生平均直径在0.2微米至1.5微米之间的聚合物颗粒; 和(3)在第三阶段,进一步聚合至单体转化率大于80%,以及通过这种方法制备的聚合物。