发明名称 |
PREPARATION OF VINYL CHLORIDE POLYMERS |
摘要 |
Preparation of vinyl chloride polymers A process for preparation of a vinyl chloride polymer comprising the steps of subjecting an aqueous medium containing vinyl chloride monomer or a mixture of vinyl chloride monomer with other vinyl monomer, a polymerization initiator and a dispersant to high-speed shear agitation at a shear rate of 104 sec-1 or above to prepare a suspended dispersion containing fine particles of the monomer(s) dispersed therein, then subjecting the suspended dispersion to low-speed shear agitation at a shear rate of from 10 to 100 sec-1, and thereafter starting suspension polymerization. Even with a decreased amount of dispersant, the process inhibits the coarsening of the polymer particles, to yield the polymer with a narrow particle diameter distribution. Deposition of scale and formation of fish-eyes are also prevented effectively.
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申请公布号 |
CA2039765(A1) |
申请公布日期 |
1991.10.06 |
申请号 |
CA19912039765 |
申请日期 |
1991.04.04 |
申请人 |
SHIN-ETSU CHEMICAL CO., LTD. |
发明人 |
KITAMURA, HAJIME;KANEKO, ICHIRO |
分类号 |
C08F2/00;C08F2/18;C08F2/20;C08F14/00;C08F14/06;(IPC1-7):C08F14/06 |
主分类号 |
C08F2/00 |
代理机构 |
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代理人 |
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地址 |
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