Copolyimide ODPA/BPDA/4,4'-ODA or P-PDA

Details Copolyimide ODPA/BPDA/4,4'-ODA or P-PDA Copolyimide ODPA/BPDA/4,4'-ODA or P-PDA

1989-10-26

1991-12-31

Kight, III, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528188, 528189, 525432, C08G 6926

Patent

active

050773828

ABSTRACT:
A co-polyimide based upon a mixture of 4,4'-oxydiphthalic dianhydride (ODPA) and 3,4,3',4'-biphenyltetracarboxylic dianhydride (BPDA) as the dianhydride component and either 4,4'-oxydianiline (ODA) or paraphenylene diamine as the amine component is disclosed. The molar ratio between the ODPA and BPDA ranges from 3:1 to 1:3. The co-polyimide may either be formed as a random copolymer, or as a block copolymer where the blocks are based upon blocks of polymer containing ODPA and blocks of polymer containing BPDA provided that the molar ratios of ODPA and BPDA are in the ratio of 3:1 to 1:3.

REFERENCES:
patent: 3416994 (1968-12-01), Chalmers et al.
patent: 3520837 (1970-07-01), Wilson
patent: 3528950 (1970-09-01), Lubowitz
patent: 3959350 (1976-05-01), Rogers
patent: 4247443 (1981-01-01), Sasaki et al.
patent: 4290936 (1981-09-01), Sasaki et al.
patent: 4537947 (1985-08-01), D'Alelio

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