Process for producing polycarbonate oligomers

Details Process for producing polycarbonate oligomers Process for producing polycarbonate oligomers

1977-06-06

1978-10-24

Pertilla, Theodore E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260 95C, 422134, 526 64, 526 65, 528196, C08G 1713, C08G 6362

Patent

active

041221125

ABSTRACT:
A process for producing polycarbonate oligomers by the reaction of dihydroxy compounds with phosgene, which comprises contacting a mixture of a dihydroxy compound and an aqueous alkali solution with phosgene in the presence of an organic solvent in a tubular reactor to perform a first-stage reaction, introducing the first-stage reaction mixture into a tank-type reactor equipped with a stirrer and containing the aqueous alkali solution and a solution in the organic solvent of a polycarbonate oligomer formed by the reaction of the first-stage reaction product in a second stage, and performing the second-stage reaction while stirring the reaction mixture in the tank-type reactor and maintaining it at a predetermined temperature by sufficient removal of the heat of reaction.

REFERENCES:
patent: 3133044 (1964-05-01), Allen et al.
patent: 3646102 (1972-02-01), Kubayashi et al.
patent: 3674740 (1972-07-01), Vernaleken et al.
patent: 3974124 (1976-08-01), Narita et al.

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