Melt process for polycarbonate with improved heat stability

Details Melt process for polycarbonate with improved heat stability Melt process for polycarbonate with improved heat stability

1994-10-24

1996-03-05

Seidleck, James J.

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

Synthetic resins

Treating polymer containing material or treating a solid...

528196, 528198, 524158, 524165, 524745, 524746, C08F 600

Patent

active

054969212

ABSTRACT:
Polycarbonates are prepared by inducing the melt polycondensation of an aromatic dihydroxy compound and a diester carbonate in the presence of alkali metal compounds and/or alkaline earth metal compound droxy and adding to the polycarbonate which is the reaction product thereof: a sulfonic acid compound having the formula ##STR1## in an amount of 0.05-10 ppm, based on the polycarbonate, an epoxy compound in an amount of 1-2000 ppm, based on the polycarbonate and a phosphorus compound in an amount of 10-1000 ppm, based on the polycarbonate.

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

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