Improved transesterification process for the production of polyc

Details Improved transesterification process for the production of polyc Improved transesterification process for the production of polyc

1993-11-19

1995-08-22

Seidleck, James J.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

526 67, 528199, C08G 6400

Patent

active

054441480

ABSTRACT:
An improvement to the transesterification process for the production of aromatic polycarbonates is disclosed. Into the melt which contains diphenols, carbonic acid diaryl esters and optionally branching agents and at temperatures of 130.degree. C. to 400.degree. C. and in the presence of catalysts there is mixed or passing thereover inert gas in a quantity of at least 0.5 Nm3 per kg of polycarbonate melt.

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patent: 5104963 (1992-04-01), Westeppe et al.
patent: 5191001 (1993-03-01), Kehlig et al.

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