Extruded porous articles of polyimide and continuous preparation of the same
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United States of America Patent
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Jul 17, 1990
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N/A
app pub date -
Apr 17, 1989
filing date -
Dec 6, 1985
priority date (Note) -
Expired
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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##
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