Method for preparing polycarbonates of enhanced crystallinity

Details Method for preparing polycarbonates of enhanced crystallinity Method for preparing polycarbonates of enhanced crystallinity

1999-01-28

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

C08G 6400

Patent

active

060310626

ABSTRACT:
Crystallinity of amorphous precursor polycarbonates is enhanced by contact with at least on diaryl carbonate such as diphenyl carbonate, followed by pelletization and heating to a temperature above the melting point of the diaryl carbonate and below the glass transition temperature of the amorphous precursor polycarbonate. The crystallinity enhancement operation may be conducted in the presence of dihydroxyorganic monomers and may be followed by a solid state polymerization operation.

REFERENCES:
patent: 4948871 (1990-08-01), Fukuoka et al.
patent: 5204377 (1993-04-01), Fukawa et al.
patent: 5214073 (1993-05-01), Fukawa et al.
Concurrently filed U.S. Patent Application RD-26315, entitled "Method for Preparing Copolycarbonates of Enhanced Crystallinity", by Marc B. Wisnudel et al.

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