Hot-melt polycondensation method for manufacturing a polycarbona

Details Hot-melt polycondensation method for manufacturing a polycarbona Hot-melt polycondensation method for manufacturing a polycarbona

1994-07-28

1996-05-07

Seidleck, James J.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

524367, 524378, 525461, 525463, 528196, C08G 6400

Patent

active

055147674

ABSTRACT:
The method of the present invention is a hot-melt polycondensation for an aromatic dihydroxy compound and a dicarbonate in the presence of a basic catalyst, adding sulfur-containing acid compound with a pKa value less than 3 or the derivative thereof, and 5-1,000 ppm of water, and additives as needed for the polycarbonate while the reaction product polycarbonate is still in a molten state, and kneading the material.

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