Continuous production of polycarbonates

Details Continuous production of polycarbonates Continuous production of polycarbonates

1974-02-01

1976-03-23

Briggs, Sr., Wilbert J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 49, C08G 6362

Patent

active

039459691

ABSTRACT:
High molecular weight linear polycarbonates are prepared by continuous condensation of organic dihydroxy compounds and phosgene in two reaction zones, a mixture of an aqueous-alkaline solution of the organic dihydroxy compound and an aqueous catalyst solution being introduced at the rate of from 1 to 50 meters per second and the phosgene at the rate of from 30 to 300 meters per second into the first reaction zone and condensed, an organic solvent being incorporated into the resultant reaction mixture containing oligomer and polycarbonate and the condensation of the aqueous-organic reaction mixture carried to completion in the second reaction zone by the two-phase interfacial method.

REFERENCES:
patent: 3530094 (1970-09-01), Schnell et al.
patent: 3674740 (1972-07-01), Vernaleken et al.
patent: 3787359 (1974-02-01), Horn et al.

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