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Title:
LARGE-PORE-DIAMETER POROUS HOLLOW YARN MEMBRANE OF POLYETHYLENE, PRODUCTION THEREOF, AND HYDROPHILIC POROUS HOLLOW YARN MEMBRANE OF POLYETHYLENE
Document Type and Number:
WIPO Patent Application WO/1992/009359
Kind Code:
A1
Abstract:
A large-pore-diameter porous hollow yarn membrane of polyethylene, which has a layered structure wherein slit-shaped micropores surrounded by microfibrils arranged in the longitudinal direction of the filament and knots composed of stacked lamellae interconnect the inner and outer wall surfaces of the hollow filament and which has an average diameter of the micropore of more than 2 $g(m)m up to 10 $g(m)m as measured with a mercury porosimeter, a porosity of 75 to 95 %, and an air permeation rate of 8 x 10?5¿ l/m?2¿.hr.0.5 atm or above. This membrane is produced by melt spinning polyethylene and subjecting the obtained unstretched yarn to annealing, cold stretching and hot stretching under specified conditions.

Inventors:
Kamo, Jun (Central Research Laboratories, Mitsubishi Rayon Co. Ltd., 20-1, Miyukich, Otake-shi Hiroshima 739-06, JP)
Hirai, Takayuki (Central Research Laboratories, Mitsubishi Rayon Co. Ltd., 20-1, Miyukich, Otake-shi Hiroshima 739-06, JP)
Takahashi, Hiroshi (Central Research Laboratories, Mitsubishi Rayon Co. Ltd., 20-1, Miyukich, Otake-shi Hiroshima 739-06, JP)
Kondo, Kenji (Central Research Laboratories, Mitsubishi Rayon Co. Ltd., 20-1, Miyukich, Otake-shi Hiroshima 739-06, JP)
Application Number:
PCT/JP1991/001638
Publication Date:
June 11, 1992
Filing Date:
November 28, 1991
Export Citation:
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Assignee:
MITSUBISHI RAYON CO., LTD. (3-19, Kyobashi 2-chome Chuo-ku, Tokyo 104, JP)
Kamo, Jun (Central Research Laboratories, Mitsubishi Rayon Co. Ltd., 20-1, Miyukich, Otake-shi Hiroshima 739-06, JP)
Hirai, Takayuki (Central Research Laboratories, Mitsubishi Rayon Co. Ltd., 20-1, Miyukich, Otake-shi Hiroshima 739-06, JP)
Takahashi, Hiroshi (Central Research Laboratories, Mitsubishi Rayon Co. Ltd., 20-1, Miyukich, Otake-shi Hiroshima 739-06, JP)
Kondo, Kenji (Central Research Laboratories, Mitsubishi Rayon Co. Ltd., 20-1, Miyukich, Otake-shi Hiroshima 739-06, JP)
International Classes:
B01D67/00; B01D69/02; B01D69/08; B01D71/26; B29C55/00; D01D5/247; (IPC1-7): B01D71/26
Attorney, Agent or Firm:
Wakabayashi, Tadashi (8th Floor, 16th Kowa Bldg. 9-20, Akasaka 1-chom, Minato-ku Tokyo 107, JP)
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