发明名称 |
Production of foamed polymer structures. |
摘要 |
Described are ways of improving the yields of specification grade polyimide foam on a consistent basis from one run to the next, by use of improvements in microwave-based foaming processes. While a body of polyimide precursor is exposed to microwave radiation, the body of polyimide precursor and of the foam structure as it is developing therefrom are kept under a substantially vapor-impermeable microwave-compatible shroud that does not substantially restrict or impede development of the foam structure. For this purpose use may be made of a shroud composed of a polymer film. Mechanisms by which the shroud produces the improved results are discussed, and methods based thereon are set forth. |
申请公布号 |
EP0349796(A1) |
申请公布日期 |
1990.01.10 |
申请号 |
EP19890110597 |
申请日期 |
1989.06.12 |
申请人 |
ETHYL CORPORATION |
发明人 |
LEE, RAYMOND;WENDELL LANIER, CARROLL;BROEMMELSIEK, HENRY EUGENE |
分类号 |
C08J9/02;B01J19/12;B29C35/08;B29C44/34;C08J9/00;C08J9/06;C08J9/10 |
主分类号 |
C08J9/02 |
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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