发明授权
- 专利标题: Oriented porous polypropylene films
- 专利标题(中): 定向多孔聚丙烯薄膜
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申请号: US325680申请日: 1989-03-20
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公开(公告)号: US4975469A公开(公告)日: 1990-12-04
- 发明人: Philip Jacoby , Charles W. Bauer
- 申请人: Philip Jacoby , Charles W. Bauer
- 申请人地址: IL Chicago
- 专利权人: Amoco Corporation
- 当前专利权人: Amoco Corporation
- 当前专利权人地址: IL Chicago
- 主分类号: C08J9/00
- IPC分类号: C08J9/00 ; A01G9/14 ; A01G13/02 ; B29C55/00 ; C08J5/18 ; C08J9/26
摘要:
This invention relates to oriented porous films having cells with polygonal cross sections and average pore diameters of about 5 to about 30 microns and interconnecting pores between the cells which have a diameter of about 0.2 to about 20 microns which are formed from a polypropylene-based resin and a process for forming the film which comprises the steps of forming a film containing beta-spherulites, selectively extracting a portion of the beta-spherulites to form a porous film and stretching the porous film in at least one direction to form the oriented polymeric porous film.
公开/授权文献
- US5476448A Apparatus for suppressing a vacuum surge in eye surgery 公开/授权日:1995-12-19