Process for the preparation of polycarbonates

Details Process for the preparation of polycarbonates Process for the preparation of polycarbonates

1997-03-17

1998-09-15

Mosley, Terressa

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

058079645

ABSTRACT:
A process for the preparation of poly(arylcarbonate)s, relying on reaction of dialkyl carbonates with bisphenols and using selected organotin and oganotitanium catalysts. The process is preferably performed in a first step in which bisphenols and dialkyl carbonates are reacted using a catalyst to obtain an oligo(arylcarbonate). The oligo(arylcarbonate) then undergoes a post polycondensation in a second step, either by itself or with diphenyl carbonate. The second step also uses a catalyst. The process yields poly(arylcarbonate)s that are characteristically free of color and gel.

REFERENCES:
patent: 5104963 (1992-04-01), Westeppe et al.
patent: 5414057 (1995-05-01), Campbell et al.

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