首页>
外国专利>
seen in the polymerization of vinyl chloride and aqueous dispersion for anvendning during polymerization of vinyl chloride
seen in the polymerization of vinyl chloride and aqueous dispersion for anvendning during polymerization of vinyl chloride
展开▼
机译:在氯乙烯和水分散液的聚合中看到的氯乙烯聚合反应中看到的
展开▼
页面导航
摘要
著录项
相似文献
摘要
A process for the polymerization of ethylenically unsaturated monomers, such as vinyl chloride, wherein a solid, monomer-soluble, free-radical forming compound is used as initiator. The initiator is added to the polymerization system in the form of an aqueous dispersion which contains an ethoxylated nonionic emulsifier with an HLB-value above 15, and preferably above 17, which emulsifier does not contain cyclic inner ether bonds. Polymerizates produced according to the method have good electric insulation properties. Suitable ethoxylated nonionic emulsifiers are ethoxylated fatty acids and ethoxylated fatty alcohols. A means, suitable for polymerization of ethylenically unsaturated monomers, consists of an aqueous dispersion of a free-radical forming compound containing a nonionic ethoxylated emulsifier with an HLB-value above 15, in an amount of at least 1 percent by weight, based on the initiator, and preferably also a protective colloid such as polyvinyl alcohol. The dispersions have good stability and are easy to handle.
展开▼