Melt preparation of polycarbonate with metal compound and p comp

Details Melt preparation of polycarbonate with metal compound and p comp Melt preparation of polycarbonate with metal compound and p comp

1992-08-24

1993-10-05

Anderson, Harold D.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

524611, 526 65, 528125, 528126, 528171, 528196, 528198, C08G 6430

Patent

active

052506550

ABSTRACT:
An aromatic polycarbonate of improved color value and high molecular weight is obtained by the addition of phosphorous acid and/or a phosphorous ester to the melt polycondensation reaction medium containing aromatic diol, carbonate diester and a metal-containing compound as ester interchange catalyst during the polycondensation reaction

REFERENCES:
patent: 2997459 (1961-08-01), Schnell et al.
patent: 3305520 (1967-02-01), Fritz et al.
patent: 3404122 (1968-10-01), Fritz et al.

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