Copolyimides prepared from 3,4'-oxydianiline and 1,3-bis(3-amino

Details Copolyimides prepared from 3,4'-oxydianiline and 1,3-bis(3-amino Copolyimides prepared from 3,4'-oxydianiline and 1,3-bis(3-amino

1995-02-14

1999-02-02

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, 528183, 528185, 528188, 528220, 528229, 4284111, 4284735, 526935, 524600, 524607, C08G 6926, C08G 7310

Patent

active

058666761

ABSTRACT:
Polyimide copolymers were prepared by reacting different ratios of 3,4'-oxydianiline (ODA) and 1,3-bis(3-aminophenoxy)benzene (APB) with 3,3',4,4'-biphenylcarboxylic dianhydride (BPDA) and endcapping with an effective amount of a non-reactive endcapper. Within a narrow ratio of diamines, from .sup..about. 50% ODA/50% APB to .sup..about. 95% ODA/5% APB, the copolyimides prepared with BPDA have a unique combination of properties that make them very attractive for various applications. This unique combination of properties includes low pressure processing (200 psi and below), long term melt stability (several hours at 390.degree. C.), improved toughness, improved solvent resistance, improved adhesive properties, and improved composite mechanical properties.

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