Method for producing a polycarbonate oligomer

Details Method for producing a polycarbonate oligomer Method for producing a polycarbonate oligomer

1976-07-12

1978-05-16

Brust, Joseph Paul

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 6802

Patent

active

040898881

ABSTRACT:
Polycarbonate oligomer having uniform qualities is prepared by reacting an aqueous alkaline solution of 2,2-(4,4'-dihydroxydiphenyl) propane with phosgene in the presence of methylene chloride and as a characteristic point of this method, in the presence of an inert gas in an amount of 1 to 10 mol % based upon the phosgene.

REFERENCES:
patent: 2335441 (1943-11-01), Pearson et al.
patent: 3248365 (1966-04-01), Oxenrider et al.
patent: 3631200 (1971-12-01), Nehring et al.
patent: 3646102 (1972-02-01), Kobayashi et al.
patent: 3974126 (1976-08-01), Narita et al.

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