Method for enhancing crystallinity of polycarbonates

Details Method for enhancing crystallinity of polycarbonates Method for enhancing crystallinity of polycarbonates

1999-08-09

2000-02-29

Boykin, Terressa M.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528198, C08G 6400

Patent

active

060310634

ABSTRACT:
The crystallinity of an amorphous precursor polycarbonate is enhanced by contact in the liquid or vapor state with a non-solvent which may be water, an alkanol or a mixture thereof and which is dialkyl carbonate-free. Contact temperatures are at least about 75.degree. C. and are further defined by the relationship

REFERENCES:
patent: 4948871 (1990-08-01), Fukuoka
patent: 5204377 (1993-04-01), Fukawa et al.
Copending U.S. Patent Application Serial No. 08/986,448, filed Dec. 8, 1997, by Bhaskar B. Idage et al., entitled "Method of Preparing Polycarbonates by Solid State Polymerization".

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