Process of producing porous thermoplastic resin article

Details Process of producing porous thermoplastic resin article Process of producing porous thermoplastic resin article

1984-12-27

1986-01-07

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

With step of cooling to a temperature of zero degrees c. or...

264 83, 264154, 2642896, 264DIG47, B29C 5502, B29C 5522, B29C 3516

Patent

active

045633177

ABSTRACT:
A process of producing a porous thermoplastic resin article in the form of hollow yarn or film which comprises a step for forming a large number of micropores in the article by drawing an article, which is characterized in that the drawing process is performed in a medium selected from the group consisting of nitrogen, oxygen, argon, carbon monoxide and a hydrocarbon such as methane or ethane at a temperature in the range of the freezing point to 50.degree. C. above the boiling point of said medium.

REFERENCES:
patent: 2320112 (1943-05-01), Wiley
patent: 3946094 (1976-03-01), Kanetsuna
patent: 4384023 (1983-05-01), Okamura et al.

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