Method for quenching of polycarbonate

Details Method for quenching of polycarbonate Method for quenching of polycarbonate

1999-03-22

2000-09-26

Boykin, Terressa M.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528196, C08G 6302

Patent

active

061244228

ABSTRACT:
Polycarbonate produced by reaction in a melt of a diaryl carbonate and a dihydric phenol in the presence of a basic catalyst is quenched to reduce the level of residual catalyst by combining the polycarbonate with a powder-free quenching composition. The quenching composition contains an acidic quencher, such as an alkyl tosylate, in a non-powder carrier. The non-powder carrier may be a liquid or a solid, for example in the form of pellets containing or coated with the quencher.

REFERENCES:
patent: 5210268 (1993-05-01), Fukuoka et al.
patent: 5319066 (1994-06-01), King, Jr.
patent: 5713453 (1998-02-01), Schornhorst et al.
patent: 5717057 (1998-02-01), Sakashita et al.
patent: 5834615 (1998-11-01), Nishihira et al.

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