Biphenyltetracarboxylic acid dianhydride and process for...

Details Biphenyltetracarboxylic acid dianhydride and process for... Biphenyltetracarboxylic acid dianhydride and process for...

2005-06-28

2010-11-30

Dentz, Bernard (Department: 1625)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C528S353000

Reexamination Certificate

active

07842824

ABSTRACT:
To provide a process for producing BPDA whereby high productivity is attained while high purity is maintained.A process for producing biphenyltetracarboxylic acid dianhydride, which comprises heating biphenyltetracarboxylic acid to produce biphenyltetracarboxylic acid dianhydride, characterized in that the heating is carried out at a pressure of from 1×102Pa to 1.1×105Pa to a maximum temperature in a range of from 210° C. to 250° C. in such a manner that the temperature rising rate is higher than 50° C./hr for a period of at least ¼ of the time for the temperature rise from 60° C. to 210° C., and the temperature is maintained to be from 150° C. to 250° C. for from 0.5 to 10 hours.

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Perry et al, Chemical Engineer's Handbook, (1973) Mc-Graw-Hill, p. 19-19 to 19-26.
Hergenrother, Polymer 43 (2002) pp. 5077-5093pp.

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