Title:
PROCESS FOR PRODUCING MICROPOROUS POLYOLEFIN FILM
Document Type and Number:
WIPO Patent Application WO/1998/045358
Kind Code:
A1
Abstract:
A process for producing a microporous polyolefin film which is used in applications such as water treatment and microfiltration membranes and has a relatively large pore diameter, a narrow pore diameter distribution, and excellent permeability, characterized by preparing a solution comprising 5 to 40 % by weight of a polyolefin composition containing an ultrahigh-molecular polyolefin having a weight-average molecular weight of 5x10?5� or higher and 95 to 60 % by weight of a solvent, extruding the solution through die lips, rapidly cooling the extrudate, and stretching the resultant sheet 1.01- to 1.4-fold in terms of areal ratio.
Inventors:
KAIMAI NORIMITSU (JP)
TAKITA KOTARO (JP)
KONO KOICHI (JP)
TAKITA KOTARO (JP)
KONO KOICHI (JP)
Application Number:
PCT/JP1998/001537
Publication Date:
October 15, 1998
Filing Date:
April 03, 1998
Export Citation:
Assignee:
TONEN SEKIYUKAGAKU KK (JP)
KAIMAI NORIMITSU (JP)
TAKITA KOTARO (JP)
KONO KOICHI (JP)
KAIMAI NORIMITSU (JP)
TAKITA KOTARO (JP)
KONO KOICHI (JP)
International Classes:
C08J9/00; B01D67/00; B01D71/26; B29C48/305; B29C55/00; B29C55/12; B29D7/01; C08J5/22; C08K5/01; C08L23/00; B29K23/00; B29K105/04; B29L7/00; (IPC1-7): C08J9/00
Foreign References:
| JPH0987413A | 1997-03-31 |
Other References:
See also references of EP 0919586A4
Attorney, Agent or Firm:
Kawabi, Kenji (6th floor 9-7, Higashi-ikebukuro 3-chom, Toshima-ku Tokyo, JP)
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