Catalyst system for polycarbonate manufacture

Details Catalyst system for polycarbonate manufacture Catalyst system for polycarbonate manufacture

1994-05-10

1996-04-23

Seidleck, James J.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528196, 528198, C08G 6400

Patent

active

055104495

ABSTRACT:
A method is provided for making polycarbonates utilizing an effective amount of a binary phase transfer catalyst, such as tetrabutylammonium bromide and a methyl tertiary amine as a condensation catalyst during the interfacial phosgenation of a bisphenol, such as bisphenol A. Improved phosgene utilization is achieved.

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patent: 4927904 (1990-05-01), Guggenheim et al.
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