发明授权
- 专利标题： Process for making high-flow anisotropic membranes
- 专利标题（中）： 制备高流动性等离子体膜的方法
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申请号： US3567810D申请日： 1968-04-01
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公开(公告)号： US3567810A公开(公告)日： 1971-03-02
- 发明人: BAKER RICHARD W
- 申请人： AMICON CORP
- 专利权人： Amicon Corp
- 当前专利权人： Amicon Corp
- 优先权： US71789968 1968-04-01; US71798568 1968-04-01
- 主分类号： B01D67/00
- IPC分类号： B01D67/00 ; B01D71/68 ; B29D7/01 ; B29D27/04
摘要：
THIS INVENTION RELATES TO A NOVEL PROCESS FOR FORMING IMPORVED POLYMERIC ANISOTROPIC MEMBRANES COMPRISING THE ADDITIONAL STEP OF SUBJECTING A CAST POLYMER FILM SUITABLE FOR FORMATION OF SUCH AN ANISOTROPIC MEMBRANE TO AN EVAPORATION STEP PRIOR TO PRECIPITATION OF THE MEMBRANE, SAID EVAPORATIVE STEP CONTROLLED TO SELECTIVELY EVAPORATE SOLVENT FROM THE SURFACE OF SAID FILM AND THEREBY SELECTIVELY INCREASE THE POLYMER CONCENTRATION AT THE SURFACE OF SAID FILM. THE IMPROVED MEMBRANES FORMED BY THE PROCESS OF THE INSTANT INVENTION ARE CHARACTERIZED BY IMPROVED REJECTION CHARACTERISTICS WHILE RETAINING LIQUID FLUX CHARACTERISTICS WHICH ARE SURPRISINGLY HIGH IN VIEW OF THE REJECTION CHARACTERISTICS.
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