Extrusion process of polyimide and polyimide pellet used for the

Details Extrusion process of polyimide and polyimide pellet used for the Extrusion process of polyimide and polyimide pellet used for the

1990-03-26

1991-12-03

Theisen, Mary Lynn

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

With subsequent cutting, grooving, breaking, or comminuting

264126, 264140, 264141, 2641761, 264234, 26433114, 26433119, B29C 4778, B29C 6724

Patent

active

050698486

ABSTRACT:
Polyimide which is obtained by polymerization and consists essentially of recurring structural units of the formula (I): ##STR1## wherein X is a single bond or a hexafluoroisopropylidene group, is processed to a form of pellet, followed by heat-treating to obtain crystallinity of 5% or more, and fed to an extruder to obtain articles.

REFERENCES:
patent: 4238538 (1980-12-01), Manwiller
patent: 4302413 (1981-11-01), Howe et al.
patent: 4581264 (1986-04-01), Emery et al.
patent: 4642211 (1987-02-01), Elbs et al.

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