发明名称 |
Production process for vinylpyrrolidone polymer |
摘要 |
The present invention provides a production process for a vinylpyrrolidone polymer which process prevents the polymerization reaction of N-vinylpyrrolidone from being hindered by by-products (as formed by nucleomethylation of N-vinylpyrrolidone) or gamma-butyrolactone, and therefore enables to obtain a vinylpyrrolidone polymer that has a desired molecular weight and involves only a small amount of residual monomers, wherein the vinylpyrrolidone polymer can display excellent properties even if the vinylpyrrolidone polymer is, for example, crosslinked to convert it into a water-absorbent resin. The production process for a vinylpyrrolidone polymer comprises the step of polymerizing a polymerizable monomer component or components which include N-vinylpyrrolidone, wherein: the N-vinylpyrrolidone as used is N-vinylpyrrolidone having a gamma-butyrolactone content of not more than 500 ppm; and/or the N-vinylpyrrolidone as used is N-vinylpyrrolidone obtained without using acetylene as a raw material.
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申请公布号 |
US2001020078(A1) |
申请公布日期 |
2001.09.06 |
申请号 |
US20010772971 |
申请日期 |
2001.01.31 |
申请人 |
TOMIHISA DAIJO;HARADA NOBUYUKI;NAKA AKIO;KURIYAMA TOSHIAKI;SHIMASAKI YUUJI;NISHIBAYASHI HIDEYUKI |
发明人 |
TOMIHISA DAIJO;HARADA NOBUYUKI;NAKA AKIO;KURIYAMA TOSHIAKI;SHIMASAKI YUUJI;NISHIBAYASHI HIDEYUKI |
分类号 |
C08F26/10;C08F226/10;(IPC1-7):C08F26/08 |
主分类号 |
C08F26/10 |
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