Process for preparing a polyimide and a composite material conta

Details Process for preparing a polyimide and a composite material conta Process for preparing a polyimide and a composite material conta

1988-10-24

1991-08-27

Kight, III, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528125, 528126, 528172, 528176, 528187, C08G 802, C08G 6300, C08G 6926, C08G 7500

Patent

active

050434195

ABSTRACT:
This invention relates to a method for preparing a polyimide having good heat-stability and excellent flowability in a molten state.
The polymide is prepared by reacting aromatic diamines such as 4,4'-bis(3-aminophenoxy)biphenyl, bis[4-(3-aminophenoxy)phenyl] ketone and bis [4-(3-aminophenoxy)phenyl] sulfone; tetracarboxylic dianhydrides such as pyromellitic dianhydride, 3,3', 4,4'-benzophenonetetracarboxylic dianhydride and bis(3,4-dicarboxyphenyl) ether dianhydride; and dicarboxylic anhydrides such as glutaric anhydride, 1,2-hexanedicarboxylic anhydride, phthalic anhydride and 3,4-benzophenonedicarboxylic anhydride. The molar ratio of aromatic diamine: tetracarboxylic dianhydride: dicarboxylic anhydride is 1:(0.9 to 1.0):(0.001 to 1.0).
The invention also relates to polyimide composite materials which are excellent in mechanical strengths and processability. The materials contain the polyimide and fibrous reinforcing materials such as yarn, roving, tow, fabrics, mats and felts of glass fiber, carbon fibers or aromatic polyamide fibers.

REFERENCES:
patent: 3708459 (1973-01-01), Lubowitz
patent: 3803085 (1974-04-01), Takehoshi et al.
patent: 4073773 (1978-02-01), Banucci et al.
patent: 4281100 (1981-07-01), Takekoshi
patent: 4681928 (1987-07-01), Berger et al.
patent: 4696994 (1987-09-01), Nakajima et al.

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