Process for the preparation of polycarbonate

Details Process for the preparation of polycarbonate Process for the preparation of polycarbonate

2006-08-15

2006-08-15

Boykin, Terressa (Department: 1711)

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

C516S011000, C521S093000, C521S095000, C521S096000, C528S198000, C422S131000

Reexamination Certificate

active

07091302

ABSTRACT:
The invention describes a process for the preparation of polycarbonate. The process includes(a) transesterifying at least one aromatic dihydroxyaryl compound and a diaryl carbonate in the melt in the presence of a catalyst,(b) mixing the melt obtained in step (a) with a foaming agent(c) passing the mixture at 250 to 340° C. through inlet openings of a separating vessel at a rate of 0.1 to 20 kg/hour, to obtain a plurality of streams of foamed polycarbonate and degassing the streams of foamed polycarbonate in the separating vessel wherein the pressure is 0.1 to 20 mbar.

REFERENCES:
patent: 5852156 (1998-12-01), Hachiya et al.
patent: 5861474 (1999-01-01), Weller et al.
patent: 6214897 (2001-04-01), Tung et al.
patent: 6265526 (2001-07-01), Komiya et al.
patent: 6320015 (2001-11-01), Komiya et al.
patent: 6462165 (2002-10-01), Ito et al.
patent: 2003/0176622 (2003-09-01), Konishi et al.
patent: 2005/0049393 (2005-03-01), Silvi et al.

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