Low toxicity high temperature PMR polyimide

Details Low toxicity high temperature PMR polyimide Low toxicity high temperature PMR polyimide

1991-02-05

1992-12-15

Kight, III, John

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528125, 528126, 528128, 528170, 528172, 528173, 528176, 528183, 528185, 528220, 528229, 528350, 528351, 528353, C08G 7310, C08G 802, C08G 6926

Patent

active

051718227

ABSTRACT:
An improved low toxicity polymerization of monomer reactants (PMR) system has 3,4'-oxydianiline as the key monomer reactant. One variation of this system, LaRC-RP46, is prepared by reacting together monomethyl ester or 5-norbornene-2,3-dicarboxylic acid (NE), 3,4'-oxydianiline (3,4'-ODA), and dimethyl ester of 3,3',4,4'-benzophenonetetracarboxylic acid (BTDE); this combination is then treated with heat. This new matrix resin is readily processed into a high quality graphite fiber reinforced composite with excellent reproducibility. The flexibility of the ether linkage in 3,4'-ODA provides high toughness. The composite retains excellent mechanical properties both at 316.degree. C. and at 371.degree. C. The development of LaRC-RP46 will significantly extend the applications of PMR type polyimides.

REFERENCES:
patent: 4956450 (1990-09-01), Lee et al.
patent: 5015727 (1991-05-01), Riel et al.

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