Reducing ionic impurities content in aromatic polycarbonate resi

Details Reducing ionic impurities content in aromatic polycarbonate resi Reducing ionic impurities content in aromatic polycarbonate resi

1998-05-20

1999-05-25

Mosley, Terressa

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

525461, 528198, C08G 6400

Patent

active

059070277

ABSTRACT:
An aromatic polycarbonate composition having less than 400 parts per billion each of ionic impurities, particularly sulfate, chloride and fluoride ions prepared by devolatilizing the ionic impurities from a polycarbonate composition employing an aqueous medium of about 1% by weight based on the weight of the polycarbonate composition. Preferably the devolatilizing is carried out in an extruder during compounding the polycarbonate composition and preferably under a vacuum. Also, the extruded strands of polycarbonate resin are quenched in a deionized water bath.

REFERENCES:
patent: 3673146 (1972-06-01), Factor
patent: 4358568 (1982-11-01), Fox et al.
patent: 4381358 (1983-04-01), Rosenquist
patent: 5773493 (1998-06-01), Bhatia et al.

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