发明名称 |
Process for suspension polymerization of vinyl chloride employing mixed protective colloids |
摘要 |
An improvement in the process of producing polyvinyl chloride by the suspension process in the presence of protective colloids by utilizing a protective colloid mixture of from 20% to 80% of the protective colloid mixture of a polyvinyl acetate having a hydrolysis degree of 40 to 55 mol % and the remainder of the protective colloid mixture of (1) a water-soluble polyvinyl alcohol having a hydrolysis degree of 70 to 90 mol %, or (2) an aminoethyl-hydroxypropyl cellulose having a molar substitution of from 0.05 to 1.5 mols of aminoethyl groups and 3 to 5 mols of hydroxypropyl groups, or (3) a vinyl acetate/vinyl pyrrolidone copolymer having a ratio of vinyl pyrrolidone to vinyl acetate in the copolymer of 50% to 70% by weight to 30% to 50% by weight and a K-value of 25 to 40. By the use of this protective colloid mixture, the polyvinyl chloride produced exhibits a large absorption of plasticizer and gives finished products having a low number of specks.
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申请公布号 |
US4345056(A) |
申请公布日期 |
1982.08.17 |
申请号 |
US19780959796 |
申请日期 |
1978.11.13 |
申请人 |
WACKER-CHEMIE GMBH |
发明人 |
THYRET, HELMUT E.;BALWE, THOMAS;BEIER, GERHARD;BAUER, JOHANN |
分类号 |
C08F14/00;C08F2/00;C08F2/18;C08F2/20;C08F14/06;(IPC1-7):C08F2/20 |
主分类号 |
C08F14/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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