Process for preparing branched polycarbonates by solid state pol

Details Process for preparing branched polycarbonates by solid state pol Process for preparing branched polycarbonates by solid state pol

1996-05-24

1998-01-20

Mosley, Terressa

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528196, 528198, 528201, 528202, C08G 6400

Patent

active

057102384

ABSTRACT:
This invention involves a novel process for preparing branched polycarbonates employing a solid state polycondensation process; specifically, subjecting a linear crystallized oligomer derived from dihydroxydiaryl compound and a diaryl carbonate to solid state polycondensation process by heating the said oligomer at a temperature which is higher than the glass transition temperature but below its melting point in the presence of a multifunctional phenol and an alkali or alkaline metal salt or bisphenol or tetraalkylammonium hydroxide, carboxylate or bicarboxylate catalyst, the reaction being effected under inert atmosphere.

REFERENCES:
patent: 4415725 (1983-11-01), Hedges et al.
patent: 4948871 (1990-08-01), Fukuoka et al.
patent: 5204377 (1993-04-01), Fukawa et al.
patent: 5266659 (1993-11-01), Sivaram et al.

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