Process for the isolation of polycarbonates based on 4,4'-dihydr

Details Process for the isolation of polycarbonates based on 4,4'-dihydr Process for the isolation of polycarbonates based on 4,4'-dihydr

1982-09-20

1983-09-13

Lee, Lester L.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528126, 528128, 528171, C08G 6362

Patent

active

044043511

ABSTRACT:
The present invention relates to a process for the isolation of polycarbonates containing 18 to 45 mol % of structural units consisting of sulphone-bisphenols, characterized in that the sulphone-bisphenols are subjected to a polycondensation reaction with oligocarbonates containing chloroformic acid ester end groups, the phases are separated, the organic phase is purified and the sulphone-bisphenol polycarbonates are isolated.

REFERENCES:
patent: 3271364 (1966-09-01), Conix et al.
patent: 3271367 (1966-09-01), Schnell et al.
patent: 3312659 (1967-04-01), Kurkjy et al.
patent: 3312662 (1967-04-01), Kurkjy et al.
patent: 3419526 (1968-12-01), Schnell et al.
patent: 3737409 (1973-06-01), Fox
patent: 3879347 (1975-04-01), Serini et al.
patent: 3912688 (1975-10-01), Schiller et al.
patent: 3974126 (1976-08-01), Narita et al.
patent: 3974127 (1976-08-01), Tanikella et al.
patent: 4299948 (1981-11-01), Weirauch et al.

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