发明授权
- 专利标题: Production of foamed polymer structures
- 专利标题(中): 泡沫聚合物结构的生产
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申请号: US208757申请日: 1988-06-20
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公开(公告)号: US4804504A公开(公告)日: 1989-02-14
- 发明人: Raymond Lee , Carroll W. Lanier , H. Eugene Broemmelsiek
- 申请人: Raymond Lee , Carroll W. Lanier , H. Eugene Broemmelsiek
- 申请人地址: VA Richmond
- 专利权人: Ethyl Corporation
- 当前专利权人: Ethyl Corporation
- 当前专利权人地址: VA Richmond
- 主分类号: B29C35/08
- IPC分类号: B29C35/08 ; B29C44/34 ; C08J9/10 ; B29C35/00
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.
公开/授权文献
- US5981851A Soybean cultivar 952224711658 公开/授权日:1999-11-09