发明名称 |
Maleimide-based copolymer and process for producing it |
摘要 |
This invention provides a maleimide-based copolymer in which, because its molecular weight-retention ratio at high temperature is high, deterioration of physical properties by heating is little. Also, this invention provides a process wherein a maleimide-based copolymer is arranged so as not to heat more than necessity and thereby a maleimide-based copolymer containing only a small amount of residual volatile components is efficiently obtained without deterioration of physical properties. The maleimide-based copolymer is such as having a glass transition temperature of 170 DEG C. or higher, a weight-average molecular weight of 100,000 to 500,000, and a molecular weight-retention ratio of 90% or more when heated at 280 DEG C. for 10 minutes. When this copolymer is produced, volatile components are separated by supplying a polymer composition containing said copolymer and volatile components to a vent type screw extruder and operating this extruder under condition of a screw rotation number of 50 to 150 rpm.
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申请公布号 |
US5565537(A) |
申请公布日期 |
1996.10.15 |
申请号 |
US19950466664 |
申请日期 |
1995.06.06 |
申请人 |
NIPPON SHOKUBAI CO., LTD. |
发明人 |
UDA, KIMIO;SHIMOYAMA, FUMIOKI;FUJIOKA, KAZUMI |
分类号 |
B29B9/12;B29C47/00;B29C47/76;C08F6/00;(IPC1-7):C08F222/40;C08F212/06;C08F218/02;C08F220/06 |
主分类号 |
B29B9/12 |
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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