Process of making vinylidene fluoride porous membrane

Details Process of making vinylidene fluoride porous membrane Process of making vinylidene fluoride porous membrane

1995-06-07

1997-05-06

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

2642102, 2642106, 264211, 26421112, 26421119, 2642888, 2642893, 264344, B29C 6720

Patent

active

056268050

ABSTRACT:
A method of making a polyvinylidene fluoride porous membrane having an asymmetric structure, excellent mechanical strength and a narrow range of pore diameter distribution comprises: blending (i) 100 parts by weight of a vinylidene fluoride resin having an inherent viscosity, measured in dimethylformamide at a concentration of 0.4 g/dl and a temperature of 30.degree. C., of 1.4 to 15.0, (ii) 30 to 250 parts by weight of an aliphatic polyester plasticizer and, optionally and preferably, (iii) 1 to 50 parts by weight of a good solvent for vinylidene fluoride resin, to form a composition; extruding the so-formed composition to form a molten film; cooling one surface of the molten film by contact with a chill roll having a temperature of not more than 150.degree. C. and air-cooling the other surface to make a solid film; and extracting the plasticizer from the solid film.

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patent: 5221479 (1993-06-01), Etoh et al.
patent: 5387378 (1995-02-01), Pintauro et al.

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