Copolyimides prepared from 2-(3-aminophenyl)-2-(4-aminophenyl) H

Details Copolyimides prepared from 2-(3-aminophenyl)-2-(4-aminophenyl) H Copolyimides prepared from 2-(3-aminophenyl)-2-(4-aminophenyl) H

1988-09-30

1990-08-28

Kight, III, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528188, 528229, 528353, C08G 6926, C08G 6932

Patent

active

049526693

ABSTRACT:
Coolyimides and copolyamide-acids having improved solubility and processing characteristics are provided having incorporated into the polymeric chain as a novel aromatic diamine compound, 2-(3-aminophenyl)-2-(4-aminophenyl) hexafluoropropane (3,4'-6F Diamine). The copolyamide-acids and copolyimides are prepared by reacting the 3,4'-6F Diamine with a mixture of two or more aromatic tetracarboxylic acids or anhydrides thereof. It has been found that the copolyimides of this invention have improved solubility characteristics, low dielectric constants and improved thermal flow properties as a consequence of the meta/para positioning of the amino groups on the diamine, which renders these copolymers more readily melt sqinnable for the production of fibers. The copolymers may also be compression molded and fabricated into composites at moderate temperatures and pressures. Solutions of the copolyimides may be cast into films.

REFERENCES:
patent: 3328352 (1967-06-01), Kwolek
patent: 3356648 (1967-12-01), Rogers
patent: 3792148 (1974-02-01), Reske
patent: 4075172 (1978-02-01), Ozawa
patent: 4111906 (1978-09-01), Jones
patent: 4592925 (1986-06-01), DuPont

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