METHOD FOR THE SUSPENSION POLYMERIZATION OF VINYL CHLORIDE MONOMER,申请号CA19850485257-传众专利搜索

METHOD FOR THE SUSPENSION POLYMERIZATION OF VINYL CHLORIDE MONOMER

申请公布号：CA1250086(A)

申请号：CA19850485257

申请日期：1985.06.26

申请公布日期：1989.02.14

申请人：

SHIN-ETSU CHEMICAL CO., LTD.

发明人：ITOH, KENICHI;NOGUKI, GENJI;NAKAHARA, MASANOBU

分类号：C08F2/18;C08F14/06;C08F18/08;(IPC1-7):C08F14/06;C08F2/20

主分类号：C08F2/18

摘要：<p>The invention provides an improvement in the suspension polymerization of vinyl chloride or a monomer mixture mainly composed of vinyl chloride in an aqueous medium containing a nonionic surface active agent and in the presence of a monomer-soluble polymerization initiator, according to which the aqueous polymerization medium is admixed with a crosslinked copolymer having carboxyl groups such as a copolymer of acrylic acid and diethyleneglycol bisallyl or bismethallyl ether at a moment when the percentage of the monomer conversion is in the range from 1 to 20 % so that a polyvinyl chloride resin product of high quality can be obtained having an outstandingly high bulk density and plasticizer absorptivity but still containing an extremely small number of fish eyes.</p>