发明授权
- 专利标题: Membranes containing microporous structure
- 专利标题(中): 含微孔结构的膜
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申请号: US936547申请日: 1986-12-01
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公开(公告)号: US4775474A公开(公告)日: 1988-10-04
- 发明人: Chieh-Chun Chau , Charles E. Reineke , Lu H. Tung , Edward J. Kramer
- 申请人: Chieh-Chun Chau , Charles E. Reineke , Lu H. Tung , Edward J. Kramer
- 申请人地址: MI Midland
- 专利权人: The Dow Chemical Company
- 当前专利权人: The Dow Chemical Company
- 当前专利权人地址: MI Midland
- 主分类号: B01D67/00
- IPC分类号: B01D67/00 ; C08J7/02 ; B01D13/00
摘要:
Asymmetric membranes are prepared by treating a major surface of a glassy polymer composition to render the surface resistant to solvent crazing and then contacting the glassy polymer composition with a crazing solvent. The crazing solvent permanently deforms the glassy polymer composition by forming a microporous structure on the untreated surface. The treated surface becomes the dense, discriminating layer of the membrane which achieves desirable permeation selectivity. The methods of treatment are (1) crosslinking, (2) providing an agent which renders the surface resistant to crazing, and (3) providing an agent which reacts with the surface. Additionally, the glassy polymer composition can be crosslinked before or after it is crazed to increase the mechanical strength of the membrane.
公开/授权文献
- US5856050A Coverage of pixel sheet with protective layer 公开/授权日:1999-01-05