Flame-retardant, high temperature resistant polyimide fibers and

Details Flame-retardant, high temperature resistant polyimide fibers and Flame-retardant, high temperature resistant polyimide fibers and

1991-09-23

1995-01-24

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, 528172, 528173, 528176, 528183, 528188, 528220, 528224, 528229, 528350, 428359, 428364, 428369, 428397, 264168, 26417713, 26417717, 264205, 26421115, 26421117, 264233, 26433116, C08G 7310, D01F 600

Patent

active

053843908

ABSTRACT:
There are disclosed flame-retardant, high temperature resistant polyimide fibers of the general formula ##STR1## wherein n is an integer larger than 1, A is a tetravalent aromatic group and R is at least one divalent aromatic group. These polyimide fibers have been heat-treated in the unstretched state and have a maximum shrinkage of 14% when heated to a temperature of 400.degree. C. These polyimide fibers are produced by initially spinning crude fibers from a solution of the appropriate polyimide in an aprotic organic solvent, preferably according to the dry-spinning method, which solution optionally contains additives. The crude fibers obtained are washed with water to remove the solvent. The washed crude fibers are dried to a moisture content of less than 5% by mass, are subjected to a heat treatment at a temperature of between 315.degree. C and 450.degree. C, are cooled and, if desired, are crimped and cut to staple fibers. What is essential is that the heated crude fibers are heat-treated and cooled in the unstretched state.

REFERENCES:
patent: 3985934 (1976-10-01), Farrissey, Jr. et al.
patent: 4238538 (1980-12-01), Manwiller
patent: 4801502 (1989-01-01), Weinrotter et al.
patent: 5120814 (1992-06-01), Seidl

Affiliated with

Also associated with

Rating

Flame-retardant, high temperature resistant polyimide fibers and does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Flame-retardant, high temperature resistant polyimide fibers and, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flame-retardant, high temperature resistant polyimide fibers and will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1469186