Porous membrane and method for preparing the same

Details Porous membrane and method for preparing the same Porous membrane and method for preparing the same

1992-01-14

1993-04-13

Spitzer, Robert

Liquid purification or separation

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Material

21050042, 210506, B01D 5322, B01D 7178

Patent

active

052020258

ABSTRACT:
In the method for preparing a porous membrane, a polymer having a low glass transition temperature is held on the surface of a porous membrane substrate and then drawing is conducted. Accordingly, the drawing at a high draw ratio can be conducted to which the substrate as such can not be subjected. As a result, not only an excellent porous membrane having an enlarged pore size and an increased void volume can be obtained but also it is possible to control the pore size and the void volume in wide ranges. Further, a hydrophilic polymer having a glass transition temperature of not more than 300 K is formed on the surface of pores of a porous membrane substrate by graft polymerization so as to bond the hydrophilic polymer on the substrate by a covalent bond. Therefore, it is possible to provide a porous membrane excellent in unbrittleness and inhibiting elution in an environmental liquid or the like.

REFERENCES:
patent: 3657113 (1972-04-01), Stancell et al.
patent: 4262041 (1981-04-01), Eguchi et al.
patent: 4613440 (1986-09-01), Zupancic et al.
patent: 4617124 (1986-10-01), Pall et al.
patent: 4618533 (1986-10-01), Steuck
patent: 4645592 (1987-09-01), Itoh et al.
patent: 4695592 (1987-09-01), Itoh et al.
patent: 4713292 (1987-12-01), Takemura et al.
patent: 4717479 (1988-01-01), Itoh et al.
patent: 4824568 (1989-04-01), Allegrezza, Jr. et al.
patent: 4845132 (1989-07-01), Masuoka et al.
patent: 4943373 (1990-07-01), Onishi et al.
Polymer Handbook, 3rd Edition, edited by J. Brandrup & E. H. Immergut, "Propagation and Termination Constants in Free Radical Polymerization", pp. II/67-II/69 & II/81, II/82 & II/94.
M. Onishi et al., Radiat. Phys. Chem. vol. 39, No. 6, 1992, pp. 569-576, "Preparation and Properties of Plasma-initiated Graft copolymerized membranes for Blood Plasma Separation".

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