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1. 发明授权

US5232991A Preparation of an impact-resistant polyacrylate/vinyl chloride graft copolymer 失效
标题翻译：耐冲击聚丙烯酸酯/氯乙烯共聚物的制备
公开(公告)号：US5232991A
公开(公告)日：1993-08-03
申请号：US753163
申请日：1991-08-30
申请人： Harald Sturm , Armin Boebel , Karl-Heinz Prell
发明人： Harald Sturm , Armin Boebel , Karl-Heinz Prell
IPC分类号： C08F265/06 , C08F2/18 , C08F2/20 , C08F214/06 , C08F265/00 , C08F265/04
CPC分类号： C08F265/04
摘要： For the preparation of thermoplastic materials based on (a) homopolymers or copolymers of vinyl chloride and (b) polyacrylates having a glass transition temperature of less than -20.degree. C., firstly the acrylate is polymerized in aqueous emulsion in the presence of crosslinking compounds copolymerizable with the acrylates and having at least two nonconjugated double bonds. Secondly, the vinyl chloride or vinyl chloride with up to 20% by weight of copolymerizable monomers is heated with an initiator, a suspension agent system and optionally additives in an aqueous suspension to a temperature of about .gtoreq.30.degree. C. The polyacrylate is subsequently added and polymerization carried out at temperatures of about >30.degree. C. to the desired conversion. The resulting polymers exhibit improved particle size distribution, good reproducibility of the bulk density and in particular caked deposits on the wall are dramatically reduced during polymerization.
摘要翻译：为了制备基于（a）氯乙烯的均聚物或共聚物和（b）玻璃化转变温度低于-20℃的聚丙烯酸酯的热塑性材料，首先将丙烯酸酯在水性乳液中在交联化合物存在下聚合可与丙烯酸酯共聚并具有至少两个非共轭双键。其次，将高达20重量％可共聚单体的氯乙烯或氯乙烯与引发剂，悬浮剂体系和任选的添加剂一起加热至约> 30℃的温度。聚丙烯酸酯是随后加入并在约> 30℃的温度下进行聚合至所需的转化率。所得聚合物显示出改善的粒度分布，在聚合过程中体积密度的良好重现性，特别是壁上的结块沉积物显着降低。

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