Process for production of...

Details Process for production of... Process for production of...

2005-08-22

2008-08-26

Zucker, Paul A (Department: 1621)

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

Synthetic resins

From carboxylic acid or derivative thereof

C562S888000

Reexamination Certificate

active

07417108

ABSTRACT:
A process for producing 2,3,3′,4′-biphenyltetracarboxylic dianhydride (a-BPDA), comprising dehydrating 2,3,3′,4′-biphenyltetracarboxylic acid in an inert gas atmosphere under heating at 180 to 195° C. is disclosed. This process produces high-purity a-BPDA which is suitable for production of a polyimide.

REFERENCES:
patent: 4958002 (1990-09-01), Imatani et al.
patent: 5047560 (1991-09-01), Shoji et al.

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