Process for producing polycarbonate having reduced residual chlo

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate

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528198, C08G 6400

Patent

active

054592259

ABSTRACT:
A process for producing a polycarbonate, which comprises transesterifying, in the presence of an antioxidant, (A) a dihydroxy compound or a precursor thereof and (B) a carbonic acid diester having, as an impurity, a chlorine content derived from chloroformate group of at most 30 ppm, which is determined by subtracting the chlorine content extracted with water using ion chromatography from the total chlorine content contained in said carbonic acid diester determined by potentiometric titration.

REFERENCES:
patent: 5187242 (1993-02-01), Sakashita et al.
patent: 5278279 (1994-01-01), Kanno et al.

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