发明名称 |
PROCESS FOR THE PREPARATION OF VINYLPYRROLIDONE/VINYL ACETATE COPOLYMERS |
摘要 |
This invention relates to an improved process for producing a clear solution of vinylpyrrolidone (VP) and vinyl acetate (VA) monomers which comprises, in an anhydrous system, (a) reacting a C2 to C3 alcoholic solution containing said VA monomer and between about 60 and about 80 wt.% portion of total VP monomer in the presence of between about 0.05 and about 0.3 wt.% of a free radical initiator selected from the group consisting of tert-amylperoxy pivalate and 2,2-azobis(2-methylbutyronitrile) or a mixture thereof for a period of from about 5 to about 10 hours, at a temperature between about 60 and about 110 DEG C; (b) gradually adding the remaining VP monomer in C2 to C3 alcohol solution at reaction temperature after the addition of the VA monomer is complete; (c) raising the temperature of the resulting reaction mixture to between about 110 and about 150 DEG C; (d) continuing the polymerization reaction at said higher temperature in the presence of from about 0.11 to about 0.6 wt.%, based on total monomers, of 2,5-dimethyl-2,5-bis(tert-butylperoxy) hexane and (e) cooling the resulting reaction mixture and recovering a homogeneous VP/VA copolymer C2 to C3 alcohol solution containing less than 100 ppm of residual vinylpyrrolidone monomer or vinyl acetate residual monomer. |
申请公布号 |
WO9422923(A1) |
申请公布日期 |
1994.10.13 |
申请号 |
WO1994US02469 |
申请日期 |
1994.03.04 |
申请人 |
ISP INVESTMENTS INC. |
发明人 |
ZHONG, YUANZHEN;PARIKH, HEMANT;TAYLOR, PAUL, D.;SMITH, TERRY, E. |
分类号 |
C08F2/00;C08F226/10;(IPC1-7):C08F2/00;C08F218/08;C08F2/06;C08F4/04;C08F4/34 |
主分类号 |
C08F2/00 |
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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