Copolymeric polycarbonate production method

Details Copolymeric polycarbonate production method Copolymeric polycarbonate production method

1995-05-19

1996-01-16

Seidleck, James J.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528125, 528126, 528171, 528199, 528204, C08G 6302, C08G 6400

Patent

active

054848750

ABSTRACT:
The present invention relates to a method for preparing copolymeric polycarbonates which comprises melt polycondensing a mixture of an aromatic dihydroxy compound containing an amount of 2-90 mol % of hydroquinone or substituted hydroquinones and a diester carbonate in the presence of a catalyst containing an alkali metal compound or an alkaline earth metal compound 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, then adding an acidic compound to the melt polycondensation product.

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

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