发明名称 |
Dispersion stabilizer for suspension polymerization of vinyl compound and method of producing the same |
摘要 |
The present invention provides a new dispersion stabilizer that satisfies, at a high level, the performances required for a dispersion stabilizer used for suspension polymerization. A method of producing a dispersion stabilizer that is useable for suspension polymerization of a vinyl compound and contains a vinyl alcohol polymer (A) includes producing the vinyl alcohol polymer (A) by heat-treating a vinyl alcohol polymer (B) at a temperature of 90 to 180 DEG C for 0.5 to 20 hours in an atmosphere in which an oxygen concentration is 8000 ppm or lower. The vinyl alcohol polymer (B) has a saponification degree of at least 60 mol% and contains a residual acetic acid group whose block character is in the range of 0.3 to 0.6. |
申请公布号 |
EP1433794(A1) |
申请公布日期 |
2004.06.30 |
申请号 |
EP20030257733 |
申请日期 |
2003.12.09 |
申请人 |
KURARAY CO., LTD. |
发明人 |
KATO, MASAKI;TAGO, SYUNJI;SOMEMIYA, KAZUYUKI;SHO, KIYOHIKO;KATAYAMA, MASAKO;NAKANO, YOKO |
分类号 |
C08F216/06;C08F2/20;C08F8/00 |
主分类号 |
C08F216/06 |
代理机构 |
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代理人 |
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地址 |
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