Title:
EXTRUSION METHOD AND APPARATUS FOR MANUFACTURING MICROPOROUS FILM
Document Type and Number:
WIPO Patent Application WO2002024432
Kind Code:
A3
Abstract:
A method and apparatus for producing microporous films. The method utilizes a casting surface (14) and a condensing surface (18). The condensing surface (18) is spaced from the casting surface (14) to form a gap. The distance between the surfaces forming the gap is relatively small and is preferably less than 3 cm. A material, capable of forming microporous films through thermally induced phase separation processes, is cast onto the casting surface (14), preferably through conventional extrusion practices. The material contains at least one evaporative component that generally flashes off upon formation of the microporous material and condenses on the condensing surface (14).
Inventors:
YAPEL ROBERT A
HUGHES SHANNON K
KOLB WILLIAM B
HUGHES SHANNON K
KOLB WILLIAM B
Application Number:
PCT/US2001/042246
Publication Date:
June 13, 2002
Filing Date:
September 21, 2001
Export Citation:
Assignee:
3M INNOVATIVE PROPERTIES CO (US)
International Classes:
B01D5/00; B01D67/00; B01D71/26; B29C39/14; B29C48/08; B29C48/92; B29K105/04; B29L7/00; (IPC1-7): B01D67/00; C08J9/28; B29C41/02; B29C47/88; B01D5/00
Foreign References:
| GB1409786A | 1975-10-15 | |||
| US5928582A | 1999-07-27 | |||
| US5813133A | 1998-09-29 | |||
| US4539256A | 1985-09-03 | |||
| US4726989A | 1988-02-23 |
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