Copolymeric polycarbonate production method

Details Copolymeric polycarbonate production method Copolymeric polycarbonate production method

1994-03-14

1995-05-23

Kight, III, John

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528125, 528126, 528171, 528198, 528199, C08G 6302

Patent

active

054183154

ABSTRACT:
The method of this invention prepares copolymeric polycarbonates which have excellent mechanical properties, heat resistance and transparency, and which also have improved chemical resistance, hue, and residence stability by inducing the melt polycondensation of an aromatic dihydroxy compound containing an amount of 2-90 mol % of hydroquinone and/or substituted hydroquinones with a diester carbonate in the presence of a catalyst containing alkali metal compounds and/or alkaline earth metal compounds in an amount of 1.times.10.sup.-8 to 5.times.10.sup.-6 mole per mole of the total amount of the aromatic dihydroxy compound.

REFERENCES:
patent: 3489716 (1970-01-01), Calkins
patent: 5306801 (1994-04-01), Sakashita et al.

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