发明名称 |
Process for reducing monomer content in N-vinyl compound polymers |
摘要 |
A method for residual monomer diminution by which a residual monomer is speedily removed from an N-vinyl compound polymer or the like without posing a problem such as an increase in ash content; and a process for producing an N-vinyl compound polymer solution or powder which has a regulated pH and is free from a decrease in pH with time. The method comprises adding an organic acid having a boiling point of 140° C. or higher at ordinary pressure to anaqueous solution of an N-vinyl compound polymer. The process comprises adding an organic base to an aqueous N-vinyl compound polymer solution having a pH lower than 7.0 to thereby neutralize the solution and regulate the pH thereof. Those operations are conducted in a reaction vessel in which a gaseous phase is regulated so as to have an oxygen concentration of 5.0% by volume or lower.
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申请公布号 |
US2004097665(A1) |
申请公布日期 |
2004.05.20 |
申请号 |
US20030614193 |
申请日期 |
2003.07.08 |
申请人 |
NIPPON SHOKUBAI CO., LTD.;DAI-ICHI KOGYO SEIYAKU CO., LTD. |
发明人 |
KURIYAMA TOSHIAKI;INUI YASUKO |
分类号 |
C08F2/00;C08F6/00;C08F126/00;C08F226/10;(IPC1-7):C08F2/00 |
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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