Continuous interfacial method for preparing aromatic polycarbona

Details Continuous interfacial method for preparing aromatic polycarbona Continuous interfacial method for preparing aromatic polycarbona

1998-10-22

1999-10-26

Mosley, Terressa

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528198, C08G 6300, C08G 6400

Patent

active

059731036

ABSTRACT:
Aromatic polycarbonates are prepared by a process which includes a continuous stage of oligomer preparation from a carbonyl halide such as phosgene and a dihydroxyaromatic compound such as bisphenol A, under interfacial conditions in the presence of an interfacial polycarbonate formation catalyst and an alkali metal hydroxide. The molar ratio of alkali metal hydroxide to carbonyl halide during oligomer preparation is up to 1.8:1, preferably in the range of about 1.45-1.8:1. The oligomeric intermediate product is then converted to high molecular weight polycarbonate having a low proportion of cyclic oligomers, which improves its thermodynamic stability.

REFERENCES:
patent: 5011966 (1991-04-01), Silva et al.
patent: 5043203 (1991-08-01), Fyvie et al.
patent: 5359117 (1994-10-01), Totani et al.
patent: 5380814 (1995-01-01), Totani et al.

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