Melt catalytic preparation of copolymeric polycarbonate from hyd

Details Melt catalytic preparation of copolymeric polycarbonate from hyd Melt catalytic preparation of copolymeric polycarbonate from hyd

1992-06-24

1994-06-28

Anderson, Harold D.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528125, 528126, 528171, 528196, 528199, 528204, C08G 6420

Patent

active

053248090

ABSTRACT:
The present invention relates to a method of preparing a copolymeric polycarbonate which comprises melt-polycondensing a mixture of an aromatic dihydroxy compound comprising hydroquinone or substituted hydroquinones and a diester carbonate in the presence of a catalyst containing alkali metal compounds and/or alkaline earth metal compounds.

REFERENCES:
patent: 3489716 (1970-01-01), Calkins

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