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

1991-05-10

1993-04-27

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528125, 528126, 528128, 528170, 528172, 528173, 528183, 528188, 528220, 528229, 528350, 528351, 264118, 264126, 264140, 264141, 264142, 264143, C08G 6926, C08G 802, C08G 7310

Patent

active

052063399

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: 3961009 (1976-06-01), Yoda et al.
patent: 4238538 (1980-12-01), Manwiller
patent: 4302413 (1981-11-01), Howe et al.
patent: 4795798 (1989-01-01), Tamai et al.
patent: 4835249 (1989-05-01), Gallagher et al.
patent: 4994544 (1991-02-01), Nagahiro et al.

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