Liquid purification or separation – Filter – Material
Patent
1998-07-31
2000-10-03
Cooney, J
Liquid purification or separation
Filter
Material
21050021, 521 50, 521146, B01D 3914
Patent
active
061268259
ABSTRACT:
The present invention relates to a microporous membrane and a process for producing thereof, especially a microporous membrane which can be used for microfiltration, has excellent resistance to chemicals, and a process for producing thereof.
The present invention provides a microporous membrane having excellent resistance to chemicals, and a microporous membrane which facilitates waste disposal, and a process for producing thereof.
The microporous membrane has a bubble point value measured by the use of ethanol (by the test method of JIS K3832) falling in the range of from 10 kPa to 1000 kPa and comprises a polymer prepared by ring opening polymerization of a compound represented by chemical formula (I) or a polymer which is a ring opening polymer or ring opening copolymer represented by chemical formula (II). An example of the ring opening ring polymer or ring opening copolymer is a norbornene resin.
The process for producing the microporous membrane is as follows: A polymer prepared by ring opening polymerization of a compound represented by chemical formula (I) is heated and dissolved in a solvent (a) in which the polymer is soluble, and casted to form a solution membrane, which is rapidly cooled, and extracted with a washing solvent (b) in which the polymer is insoluble to remove the solvent (a), whereby the microporous membrane having a bubble point value measured by the use of ethanol (by the test method of JIS K3832) falling in the range from 10 kPa to 1000 kPa is obtained.
REFERENCES:
patent: 4249000 (1981-02-01), Batzer et al.
patent: 4326958 (1982-04-01), Kawahara et al.
patent: 4643829 (1987-02-01), Sundet
Ohtani Sumio
Shinagawa Yukio
Cooney J
Fuji Photo Film Co. , Ltd.
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