Single-step method for preparing polycarbonates from bischlorofo

Details Single-step method for preparing polycarbonates from bischlorofo Single-step method for preparing polycarbonates from bischlorofo

1990-07-27

1991-07-23

Anderson, Harold D.

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

Synthetic resins

From reactant having a halogen atom or oxygen single bonded...

528198, 528370, C08G 6420

Patent

active

050345052

ABSTRACT:
Aromatic bischloroformate compositions are interfacially converted to polycarbonates in a single step which includes capping with a monohydroxyaromatic compound. The reaction is conducted by adding an interfacial polycarbonate formation catalyst such as triethylamine and incrementally adding a base such as aqueous sodium hydroxide solution, without pH control, until the reaction mixture is non-emulsified. The amount of base to be added without pH control may be determined by titration. Further base is then added as necessary to provide a pH in the range of about 10-13.

REFERENCES:
patent: 4743676 (1988-05-01), Silva et al.

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