发明名称 |
Polyvinyl alcohol based polymer and method of manufacturing the same |
摘要 |
The present invention provides polyvinyl alcohol based (PVA) whose solubility in water varies with a small temperature change to a sufficiently great degree. In manufacturing a polyvinyl alcohol based polymer by: progressing a transesterification reaction of a polyvinyl ester based polymer with alcohol in a liquid reaction mixture including the polyvinyl ester based polymer, the alcohol, and a basic compound; precipitating the polyvinyl ester based polymer, at least a part of which has been transesterified with the alcohol, out of the liquid reaction mixture; and further progressing the transesterification reaction in the liquid reaction mixture including the polyvinyl ester based polymer that has precipitated, the liquid reaction mixture has a temperature of 75 DEG C to 150 DEG C when the polyvinyl ester based polymer, at least a part of which has been transesterified, starts precipitating. |
申请公布号 |
EP1516889(A1) |
申请公布日期 |
2005.03.23 |
申请号 |
EP20040021373 |
申请日期 |
2004.09.08 |
申请人 |
KURARAY CO., LTD. |
发明人 |
YANAI, HISAMICHI;TOKUDA, YOSHIHIRO;TOKUYASU, JIN;MIYATA, KIMIKO;FUJIWARA, NAOKI;KUSUDOU, TAKESHI |
分类号 |
C08F8/00;C08F8/12;C08F16/06;C08J3/05;C08J3/12;C08L29/04 |
主分类号 |
C08F8/00 |
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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