Thermoplastic resin porous membrane having an increased strength

Details Thermoplastic resin porous membrane having an increased strength Thermoplastic resin porous membrane having an increased strength

1983-04-20

1986-09-23

Sadowski, David

Liquid purification or separation

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Material

55158, B01D 1304

Patent

active

046134417

ABSTRACT:
A porous membrane formed of a thermoplastic resin having a critical surface tension of not higher than 35 dyn/cm and having a three-dimensional network structure is provided. Communicating pores having a porosity of at least 60% and an average pore diameter of 0.1 to 2.0 microns are formed in the porous membrane. The strength factor F defined by the following formula is at least 1 as measured in any direction: F=A/[B(1-.alpha.)], wherein A is the tensile strength at break of the membrane, B is the tensile strength at break of a non-porous film formed of the same resin and .alpha. is the porosity fraction of the membrane. The thickness of the porous membrane is 5 to 500 microns. The porous membrane is prepared by a process wherein a porous membrane formed of a thermoplastic resin having a critical surface tension of not higher than 35 dyn/cm and having a three-dimensional network structure including communicating pores having an average pore diameter of 0.05 to 1 micron with a porosity of 30 to 70%, is subjected to a space drawing operation in at least one direction at a temperature between 50.degree. C. lower than the melting or softening point of the thermoplastic resin and 5.degree. C. lower than the melting or softening point of the thermoplastic resin.

REFERENCES:
patent: 3558764 (1971-01-01), Isaacson et al.
patent: 3679538 (1972-07-01), Druin et al.
patent: 3953566 (1976-04-01), Gore
patent: 4187390 (1980-02-01), Gore
patent: 4190707 (1980-02-01), Doi et al.
patent: 4250002 (1981-02-01), Lazarz et al.

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