Extruded porous articles of polyimide and continuous preparation

Details Extruded porous articles of polyimide and continuous preparation Extruded porous articles of polyimide and continuous preparation

1989-04-17

1990-07-17

Herbert, Thomas J.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

4284735, 521919, B32B 516

Patent

active

049420925

ABSTRACT:
An extruded porous article, which can be prepared by a ram-extruding method, comprising an aggregated aromatic polyimide powder which has a heat loss ratio of not more than 2 wt. %, the heat loss ratio being measured at 360.degree. C. for 1 hour, and a mean particle size in the range of 1 to 40 .mu.m, wherein pores are distributed essentially uniformly in the article, and its porosity is in the range of 5-20%, the porosity % being defined by the formula: ##EQU1##

REFERENCES:
patent: 4238538 (1980-12-01), Manwiller

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