Low dielectric polyimide fibers

Details Low dielectric polyimide fibers Low dielectric polyimide fibers

1992-04-10

1994-11-22

Kight, III, John

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

Synthetic resins

From carboxylic acid or derivative thereof

428364, 428394, 428395, 264178F, 264183, 264184, 264197, 264205, 26421114, 26421116, 26421117, C08G 7312, B32B 2702, B29C 4788, D01F 600

Patent

active

053670469

ABSTRACT:
A high temperature resistant fiber, especially a polyimide fiber, having a dielectric constant less than 3 is prepared by first reacting 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane with 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride in an aprotic solvent to form a polyamic acid resin solution. The polyamic acid resin solution is then extruded into a coagulation medium to form polyamic acid fibers, which are thermally cured to their polyimide form. Alternatively, 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane with 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride to form a polyamic acid, and the polyamic acid is chemically converted to its polyimide form. The polyimide is then dissolved in a solvent to form a polyimide resin solution, and the polyimide resin is extruded into a coagulation medium to form a polyimide wet gel filament. In order to obtain polyimide fibers of increased tensile properties, the polyimide wet gel filaments are stretched at elevated temperatures. Tensile properties of the fibers were measured and found to be in the range of standard textile fibers. Polyimide fibers obtained by either method will have a dielectric constant similar to that of the corresponding polymer, viz., less than 3 at 10 GHz.

REFERENCES:
A. K. St. Clair et al, Proc. Polymr. Mater. Sci. Eng., 59, 28-32 (Sep. 1988).
A. K. St. Clair et al, Proc. Polymr. Sci. Eng., 59, 1177-1181 (1988). The month of publication for this reference is not available.
A. K. St. Clair et al, Recent Advances in Polyimides, Weber and Gupta, eds., Plenum Press, New York, pp. 16, 17 (1987). The month of publication for this reference is not available.

Affiliated with

Also associated with

Rating

Low dielectric polyimide fibers does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Low dielectric polyimide fibers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low dielectric polyimide fibers will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1992032