发明名称 |
Highly acetalized, coarse-grained polyvinyl acetoacetals |
摘要 |
The invention relates to highly acetalized, coarse-grained polyvinyl acetals with a degree of acetalization of >80 mol % and an average grain size of ≧100 μm obtainable by acetalization of partially or fully hydrolyzed polyvinyl esters with a degree of hydrolysis of ≧70 mol % with acetaldehyde, characterized by the fact that the acetalization is started at a temperature T1 of 0° C.≦̸T1≦̸+20° C. and is then continued at a temperature T2 of >+40° C., wherein the temperature T2 is held for a time period of 0.05 to 4 hours and the acetalization is performed in a closed reactor. |
申请公布号 |
US8309675(B2) |
申请公布日期 |
2012.11.13 |
申请号 |
US20070302104 |
申请日期 |
2007.05.25 |
申请人 |
BAUER WERNER;KURARAY EUROPE GMBH |
发明人 |
BAUER WERNER |
分类号 |
C08G16/02;C08G16/00;C08G16/04 |
主分类号 |
C08G16/02 |
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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