Uniform polyvinylidene difluoride membranes

Details Uniform polyvinylidene difluoride membranes Uniform polyvinylidene difluoride membranes

1991-04-11

1993-03-30

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

21050042, 521145, 526255, 528503, C08F 1422, B01D 7134

Patent

active

051985055

ABSTRACT:
A heat-treated, hydrophobic, polyvinylidene difluoride membrane is provided having uniform crystallinity as evidenced by a difference in crystallinity over the membrane of less than about 10 percent. Also provided is a hydrophilic, polyvinylidene difluoride membrane prepared from a heat-treated, hydrophobic, polyvinylidene difluoride membrane which remains hydrophilic after heating to a temperature as high as about 121.degree. C.

REFERENCES:
patent: 4341615 (1982-07-01), Bachot
patent: 4776959 (1988-10-01), Kasai et al.
patent: 4845132 (1989-07-01), Masuoka et al.
patent: 4851121 (1989-07-01), Yokota et al.
patent: 5079272 (1992-01-01), Allegrezza
Asahi Chem. Ind. KK (Derwent Accession No. 83-708,277, Questel Telesystem (WPIL), Abst. of Japanese Document 58/093,734, Kokai.

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