Method of producing microporous polyolefin membrane

Details Method of producing microporous polyolefin membrane Method of producing microporous polyolefin membrane

1997-07-24

1998-07-28

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

21050042, 264 459, 521134, 521142, C08J 928

Patent

active

057863962

ABSTRACT:
A method of producing a microporous polyolefin membrane having a relatively large pore size and a high permeability, the membrane being suitable for use in water treatment, microfiltration, etc. The method comprises dissolving a polyolefin composition in a solvent to prepare a solution, extruding the solution through a die lip into a form of gel-like sheet, rapidly cooling the gel-like sheet, removing a residual solvent in the cooled sheet by a washing solvent, and drying the resultant sheet to remove the washing solvent. The polyolefin composition is a mixture of (A) an ultra high molecular weight polyolefin having a weight average molecular weight of 5.times.10.sup.5 or more and (B) a polyolefin having a weight average molecular weight less than 5.times.10.sup.5, and a weight ratio of (B)/(A) is 0.2 to 20.

REFERENCES:
patent: 3954927 (1976-05-01), Duling et al.
patent: 4237080 (1980-12-01), Young et al.
patent: 4620955 (1986-11-01), Kono et al.
patent: 4655769 (1987-04-01), Zachariades

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