Process for preparing bisphenol A of good heat stability

Details Process for preparing bisphenol A of good heat stability Process for preparing bisphenol A of good heat stability

1993-04-13

1994-04-05

Evans, Joseph E.

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

Organic compounds

Oxygen containing

C07C 3770, C07C 3916

Patent

active

053006992

ABSTRACT:
This invention relates to a process for preparing bisphenol A of good heat stability by heat-treating bisphenol A containing a very small amount of impurities in a molten state at 185.degree. to 220.degree. C. for 5 to 60 minutes in an oxygen-free atmosphere and the process yields bisphenol A of good heat stability which shows reduced coloration when heated. Bisphenol A prepared by this process has excellent properties relating to color and is particularly suitable as raw material for the manufacture of polycarbonates where the requirement for color is strict.

REFERENCES:
patent: 3936507 (1976-02-01), Ligorsti et al.
patent: 4533764 (1985-08-01), Chang et al.

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