发明名称 |
Foam crystallization of condensation polymers |
摘要 |
A normally amorphous condensation polymer is crystallized by foaming it with a chemical blowing agent at a temperature above the softening point of the polymer, extruding the molten polymer to form a solid foam and maintaining the foam at a temperature above the glass transition temperature until crystallization occurs. The crystallized polymer foam may be used as a structural foam. It can be used in solid state polymerization to obtain polymers of enhanced degree of polymerization.
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申请公布号 |
US4224264(A) |
申请公布日期 |
1980.09.23 |
申请号 |
US19790004433 |
申请日期 |
1979.01.18 |
申请人 |
MONSANTO COMPANY |
发明人 |
ORT, MORRIS R.;NEWELL, ELIZABETH L. |
分类号 |
C08J9/36;(IPC1-7):B29D27/00 |
主分类号 |
C08J9/36 |
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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