Method for preparing solid state polycarbonates in a unitary ser

Details Method for preparing solid state polycarbonates in a unitary ser Method for preparing solid state polycarbonates in a unitary ser

1999-08-10

2000-10-31

Boykin, Terressa

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

Synthetic resins

From heterocyclic reactant containing as ring atoms oxygen,...

528196, 528198, C08G 5900

Patent

active

061404616

ABSTRACT:
Amorphous precursor polycarbonates, such as oligomers, are converted to high molecular weight polycarbonates in a unitary series of operations that includes contact with an alkanol having a boiling point up to about 180.degree. C. and heating the resulting wetted particles so as to effect solid state polymerization. Heating is at progressively increasing temperatures from below the boiling point of the alkanol to a final level between the Tg and the melting temperature of said enhanced crystallinity polycarbonate.

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.

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