Liquid purification or separation – Filter – Material
Patent
1990-07-11
1991-10-15
Foelak, Morton
Liquid purification or separation
Filter
Material
21050036, 21050023, 2642095, 2642108, B01D 3900
Patent
active
050572180
ABSTRACT:
Disclosed is a porous membrane comprising (1) a hydrophilic copolymer X composed principally of (poly)alkylene glycol mono(meth)acrylate units A and ethylene units B and (2) a polyolefin Y, the (poly)alkylene glycol mono(meth)acrylate units A being of the formula ##STR1## where R.sup.1 and R.sup.2 independently represent hydrogen or methyl, and n has a value in the range of 1 to 9. This porous membrane has permanent hydrophilicy suitable for the treatment of water-based liquids and can be produced by an industrially advantageous process. This process comprises melt-forming a blend of (1) a hydrophilic copolymer X composed principally of (poly)alkylene glycol mono(meth)acrylate units A and ethylene units B and (2) a polyolefin Y; heat-treating the melt-formed product in a vacuum or an inert gas medium at a temperature not higher than the melting point of polyolefin Y for a period of an hour or more; and stretching the heat-treated, melt-formed product to make it porous.
REFERENCES:
patent: 4220543 (1980-09-01), Yamashita
patent: 4346142 (1982-08-01), Lazear
patent: 4439322 (1984-03-01), Sonoda et al.
patent: 4459210 (1984-07-01), Murakami et al.
patent: 4713292 (1987-12-01), Takemura et al.
patent: 4802942 (1989-02-01), Takemura et al.
Chemical Abstracts, vol. 105, No. 12, Sep. 22, 1986, Columbus, Ohio, U.S.A., p. 45; ref. No. 98566Y; & JP-A-61 019 650 (Daiichi Kogyo Seiyaku Co., Ltd.) 28-01-1987 *Abstract*.
Honda Hironari
Koshoji Toshinobu
Misoo Kunio
Nishimura Osamu
Okamura Kiyonobu
Foelak Morton
Mitsubishi Rayon Co. Ltd.
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