Two-phase interfacial polycarbonate process

Details Two-phase interfacial polycarbonate process Two-phase interfacial polycarbonate process

1981-06-22

1983-05-17

Anderson, Harold D.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528198, 528199, 528204, C08G 6362

Patent

active

043841082

ABSTRACT:
An improved interfacial polycondensation polycarbonate process, the improvement comprising an initial equilibrated pH range of 11 to 13, a temperature range of 15.degree. to 40.degree. C., a carbonyl halide rate of addition of 0.03 to 0.3 moles per minute per mole of aromatic dihydroxy compound, and a chain stopper content of 0.02 to 0.05 moles per mole of aromatic dihydroxy compound. The resulting aromatic polycarbonate exhibits improved chemical and physical properties having a weight average molecular weight within a range of from about 25,000 to 65,000, and a monocarbonate content of less than about 400 parts per million.

REFERENCES:
patent: 2970131 (1961-01-01), Moyer et al.
patent: 3028365 (1962-04-01), Schnell et al.
patent: 3173891 (1965-03-01), Fry et al.
patent: 3275601 (1966-09-01), Schnell et al.
patent: 3318845 (1967-05-01), Dietrich et al.
patent: 3989672 (1976-11-01), Vestergaard

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