Title:
MICROPOROUS FILM AND METHOD FOR PREPARATION THEREOF
Document Type and Number:
WIPO Patent Application WO/2002/072248
Kind Code:
A1
Abstract:
A microporous film being made of a polyethylene resin of a weight average molecular weight of less than 380,000 and having a porosity of 50 to 95 % and an average pore diameter of 0.01 to 1 $g(m)m, which comprises a framework of a three-dimensional network in which macrofibrils having an average diameter of 0.2 to 1 $g(m)m are connected with one another over the whole microporous film and openings being formed by the framework and having an average diameter of 0.1 $g(m)m or more and less than 3 $g(m)m, wherein the opening forms a screen through the bridging with microfibrils being branched from the macrofibrils and having an average diameter of 0.01 $g(m)m or more and less than 0.2 $g(m)m.
Inventors:
HOSHUYAMA IZUMI (JP)
SHIMADA HITOSHI (JP)
SHIMADA HITOSHI (JP)
Application Number:
PCT/JP2002/002146
Publication Date:
September 19, 2002
Filing Date:
March 07, 2002
Export Citation:
Assignee:
ASAHI CHEMICAL IND (JP)
HOSHUYAMA IZUMI (JP)
SHIMADA HITOSHI (JP)
HOSHUYAMA IZUMI (JP)
SHIMADA HITOSHI (JP)
International Classes:
B01D67/00; B01D69/02; B01D71/26; B29D7/01; C08J5/18; (IPC1-7): B01D71/26; B01D69/00; C08J9/26
Foreign References:
| US4863792A | 1989-09-05 | |||
| JPH08134253A | 1996-05-28 | |||
| JPH107831A | 1998-01-13 | |||
| JPH11130899A | 1999-05-18 |
Attorney, Agent or Firm:
Asamura, Kiyoshi (New Ohtemachi Bldg. 2-1 Ohtemachi 2-chome Chiyoda-ku, Tokyo, JP)
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