Polyimides of 4,4'-(hexafluoroisopropylidene)bis(o-phthalic anhy

Details Polyimides of 4,4'-(hexafluoroisopropylidene)bis(o-phthalic anhy Polyimides of 4,4'-(hexafluoroisopropylidene)bis(o-phthalic anhy

1984-12-24

1986-02-11

Lee, Lester L.

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

Synthetic resins

From carboxylic acid or derivative thereof

1563315, C08G 7310

Patent

active

045699887

ABSTRACT:
A low temperature processable, thermoplastic polyimide and methods for making and using the same. The polyimide has repeating polymer units of the formula ##STR1## wherein n is 2 to about 20 and the molecular weight of the polymer chain is about 5,000 to about 50,000. The polymer 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 described above. The polyimide is particularly adapted to use as a hot melt adhesive by placing it between two articles and applying heat and pressure.

REFERENCES:
patent: 3310573 (1967-03-01), Coe
patent: 3356648 (1967-12-01), Rogers
patent: 4063984 (1977-12-01), Critchley
patent: 4336175 (1982-06-01), Gibbs

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