发明名称 |
POROUS FILMS, PROCESS FOR PRODUCING THE SAME, AND LAMINATE FILMS AND RECORDING SHEETS MADE WITH THE USE OF THE POROUS FILMS |
摘要 |
<p>Porous membranes having a micro phase separation structure and showing a light transmittance at the wavelength of 400 nm of not less than 30% are obtained by the dry phase conversion method comprising drying a coating layer of a dope containing a polymer, a good solvent for the polymer and a poor solvent for the polymer which solvent has a higher boiling point than the good solvent. The polymer includes cellulose derivatives, vinyl-series polymers such as acrylonitrile-series polymers and (meth)acrylic acid ester-series polymers, polysulfone-series polymers, and the like. The porous polymer membranes have a porosity of 10 to 60%, a mean pore size of about 0.002 to 0.35 mu m and a maximum pore size of not greater than 0.4 mu m. These porous membranes shows not only excellent transparency but also high productivity. <IMAGE></p> |
申请公布号 |
EP0889080(A1) |
申请公布日期 |
1999.01.07 |
申请号 |
EP19970946141 |
申请日期 |
1997.12.08 |
申请人 |
DAICEL CHEMICAL INDUSTRIES, LTD. |
发明人 |
HAMADA, TOYOZO;NAKATSUKA, SHUJI;MIZUMOTO, KIYOHARU |
分类号 |
B01D67/00;B01D69/02;B32B5/18;B41M5/00;B41M5/52;C08J9/28;(IPC1-7):C08J9/28 |
主分类号 |
B01D67/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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