Polyimide of alkylene diamine and 4,4'(hexafluoroisopropylidene)

Details Polyimide of alkylene diamine and 4,4'(hexafluoroisopropylidene) Polyimide of alkylene diamine and 4,4'(hexafluoroisopropylidene)

1984-12-24

1986-12-23

Lee, Lester L.

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

Synthetic resins

From carboxylic acid or derivative thereof

4284111, 524600, C08G 7310

Patent

active

046313354

ABSTRACT:
A low temperature processable moisture resistant polyimide and fiber reinforced composite of such a polymer and methods for making the same. The polyimide resin has repeating polymer units of the formula ##STR1## wherein n is 2 to about 20 and the molecular weight of the polymer chain is such that the polymer absorbs below about 0.2% by weight moisture at room temperature. The polyimide is made by reacting 4,4'(hexafluoroisopropylidene)bis(o-phthalic anhydride) with a diamine having the formula H.sub.2 N(CH.sub.2).sub.n NH.sub.2 wherein n is 2 to about 20 to form a polyamic acid. The polyamic acid is imidized to form the polyimide prepolymer and then further polymerized by exposing the polyimide prepolymer to heat to form the polymer described above. The composite can be made using the above process by coating fibers with the polyimide prepolymer, stacking layers of the coated fibers in a mold, and hot pressing the stacked impregnated fibers. The composite can also be made by coating fibers with 4,4'(hexafluoroisopropylidene)bis(o-phthalic anhydride) and a diamine as described above stacking layers of the coated fibers in a mold and hot pressing the stacked impregnated fibers.

REFERENCES:
patent: 3310573 (1967-03-01), Coe
patent: 3356648 (1967-12-01), Rogers
patent: 4063984 (1977-12-01), Critchley
patent: 4361175 (1982-06-01), Gibbs

Affiliated with

Also associated with

Rating

Polyimide of alkylene diamine and 4,4'(hexafluoroisopropylidene) does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Polyimide of alkylene diamine and 4,4'(hexafluoroisopropylidene), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polyimide of alkylene diamine and 4,4'(hexafluoroisopropylidene) will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-172367