Continuous preparation of shaped long articles of polyimide

Details Continuous preparation of shaped long articles of polyimide Continuous preparation of shaped long articles of polyimide

1988-01-14

1990-07-17

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Utilizing diverse solid particles

264126, 264127, B29C 4754

Patent

active

049420070

ABSTRACT:
A method of continuously forming a shaped long article of an aromatic polyimide power including supplying a powdery mixture containing an aromatic polyimide powder having a heat loss ratio of not more than 2 wt. % and a mean particle size in the range of 0.1 to 40 .mu.m, and a small amount of a fluororesin powder to a ram-extrusion apparatus having a mold and performing alternately, at a temperature of not lower than 300.degree. C., filling the mold with the above mixture and ram-extruding the same at a pressure in the range of 100-1,500 kg/cm.sup.2. An extruded long article of an aromatic polyimide which has a specific gravity of more than 1.380, a radial crushing strength of not less than 800 kg/cm.sup.2, and a coefficient of linear expansion in the radial direction being less than that in the longitudinal direction.

REFERENCES:
patent: 3068513 (1962-12-01), Chaffin
patent: 3179631 (1965-04-01), Endrey
patent: 3249588 (1966-05-01), Gall
patent: 3413394 (1968-11-01), Jordan
patent: 3925323 (1975-12-01), Turnbull
patent: 4238538 (1980-12-01), Manwiller
patent: 4266919 (1981-05-01), Dunnington et al.
patent: 4283361 (1981-08-01), Longworth
patent: 4302413 (1981-11-01), Howe et al.

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