发明授权
- 专利标题: Process for controlled phase transformation of alpha phase of poly(vinylidene fluoride) to the gamma phase
- 专利标题(中): 用于控制相转移聚氨酯(氟乙烯)至胶体相的方法
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申请号: US772069申请日: 1977-02-25
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公开(公告)号: US4095020A公开(公告)日: 1978-06-13
- 发明人: William M. Prest, Jr. , David J. Luca
- 申请人: William M. Prest, Jr. , David J. Luca
- 申请人地址: CT Stamford
- 专利权人: Xerox Corporation
- 当前专利权人: Xerox Corporation
- 当前专利权人地址: CT Stamford
- 主分类号: C08J3/00
- IPC分类号: C08J3/00 ; C08J7/00 ; C08L27/16 ; C08F6/00
摘要:
Process for controlled phase transformation of powders and films of the alpha phase of poly(vinylidene fluoride) to the corresponding gamma phase. The materials prepared according to this process possess enhanced electret behavior in comparison to the more prevalent forms of this polymer commonly referred to as the alpha and beta phases. Such enhancement is achieved by impregnation of the alpha phase of poly(vinylidene fluoride) with certain phase transformation agents, followed by heating of the impregnated material in a controlled manner. The agents which have been impregnated into the polymer can later be removed subsequent to phase transformation by solvent extraction techniques. The gamma form of poly(vinylidene fluoride) prepared in the above manner can be used as electrets.
公开/授权文献
- US5794326A Removal of end play in electric motors 公开/授权日:1998-08-18