Preparing polycarbonate oligomers by reacting phosgene with an a

Details Preparing polycarbonate oligomers by reacting phosgene with an a Preparing polycarbonate oligomers by reacting phosgene with an a

1979-10-03

1981-03-10

Welsh, Maurice J.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528198, 528200, C08G 6362

Patent

active

042555574

ABSTRACT:
A process for preparing polycarbonate oligomers by reacting phosgene with an alkaline aqueous solution containing an alkali metal salt or alkaline earth metal salt of a dihydric phenol in the presence of an inert organic solvent, which comprises previously cooling said alkaline aqueous solution to not higher than 0.degree. C., reacting the cooled aqueous solution with phosgene to perform a phosgenation reaction and also to absorb the heat of the phosgenation reaction by the quantity of heat that said cooled aqueous solution has, thereby to adjust the phosgenation reaction system substantially to not higher than 10.degree. C., and then oligomerizing the phosgenation product at a temperature of 15.degree. C. or higher.

REFERENCES:
patent: 3213059 (1965-10-01), Deanin et al.
patent: 3240755 (1966-03-01), Cawthon et al.
patent: 3530094 (1970-09-01), Schnell et al.
patent: 4122112 (1978-10-01), Koda et al.

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