Copolyimides prepared from ODPA, BTDA and 3,4'-ODA

Details Copolyimides prepared from ODPA, BTDA and 3,4'-ODA Copolyimides prepared from ODPA, BTDA and 3,4'-ODA

1994-08-31

1996-03-26

Hampton-Hightower, P.

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

Synthetic resins

From carboxylic acid or derivative thereof

528125, 528126, 528128, 528171, 528172, 528173, 528179, 528185, 528188, 528220, 528229, 528351, 526935, 4284111, 4284735, C08G 7310, C08G 6926

Patent

active

055021573

ABSTRACT:
A copolyimide was prepared by reacting 3,4'-oxydianiline (3,4'-ODA) with a dianhydride blend comprising, based on the total amount of the dianhydride blend, about 67 to 80 mole percent of 4,4'-oxydiphthalic anhydride (ODPA) and about 20 to 33 mole percent of 3,3',4,4'-benzophenonetetracarboxylic dianhydride (BTDA). The copolyimide may be endcapped with up to about 10 mole percent of a monofunctional aromatic anhydride and has unbalanced stoichiometry such that a molar deficit in the dianhydride blend is compensated with twice the molar amount of the monofunctional aromatic anhydride. The copolyimide was used to prepare composites, films and adhesives. The film and adhesive properties were significantly better than those of LaRC.TM.-IA.

REFERENCES:
patent: 5061783 (1991-10-01), St. Clair
patent: 5147966 (1992-09-01), St. Clair et al.

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