Linear polyamic acid, linear polyimide and thermoset polyimide

Details Linear polyamic acid, linear polyimide and thermoset polyimide Linear polyamic acid, linear polyimide and thermoset polyimide

1996-06-24

1998-01-13

Hampton-Hightower, P.

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

Synthetic resins

From carboxylic acid or derivative thereof

528125, 528128, 528172, 528173, 528174, 528176, 528183, 528185, 528188, 528220, 528229, 528350, 528352, 524606, 524607, 525262, 525275, 525282, 525285, 4284111, C08G 6926, C08G 7310

Patent

active

057081280

ABSTRACT:
Novel thermoset polyimide and composite materials comprising the thermoset polyimides and a fibrous reinforcement are prepared according to this invention. The thermoset polyimides are obtained by heat-treating a linear polyamic acid or a linear polyimide prepared by using 4,4'-bis(3-aminophenoxy)biphenyl and pyromellitic dianhydride as essential monomers or by adding 4,4'-diaminodiphenyl ether or 3,3',4,4'-biphenyltetracarboxylic dianhydride to the essential monomers and by end-capping the molecular chain end with an aromatic dicarboxylic anhydride having a carbon-carbon triple bond. The thermoset polyimides have essential excellent properties of thermoplastic polyimide and additionally has enhanced heat resistance and improved mechanical properties. The thermoset polyimide can be used to provide various kinds of composite materials for aircraft matrices, electric and electronic appliances and others.

REFERENCES:
patent: 5043419 (1991-08-01), Ohta et al.
patent: 5066771 (1991-11-01), Hino et al.
patent: 5412066 (1995-05-01), Hergenrother et al.
patent: 5478915 (1995-12-01), Amone et al.
patent: 5567800 (1996-10-01), Hergenrother et al.

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