Cyclic polycarbonate oligomers and methods for their preparation

Details Cyclic polycarbonate oligomers and methods for their preparation Cyclic polycarbonate oligomers and methods for their preparation

1985-02-22

1987-02-17

Anderson, Harold D.

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

Synthetic resins

From reactant having a halogen atom or oxygen single bonded...

528 86, 528370, 528372, C08G 6362

Patent

active

046440534

ABSTRACT:
Cyclic polycarbonate (or thiol analog) oligomer mixtures are prepared by the reaction of bishaloformates or their thio analogs or mixtures thereof with dihydroxy or dimercapto compounds, with alkali metal hydroxides and various amines. The oligomer mixtures may be converted to polycarbonates or their thiol analogs by a method which is particularly adaptable to integration with polycarbonate processing operations.

REFERENCES:
patent: 3155683 (1964-11-01), Moody
patent: 3274214 (1966-09-01), Prochaska
patent: 3297634 (1967-01-01), Oxenrider et al.
patent: 3299948 (1967-01-01), Weirauch et al.
patent: 3386954 (1968-06-01), Schnell et al.
patent: 3422119 (1969-01-01), Prochaska
Schnell et al., Makromol. Chem., 57, 1-11, (1962).
C.A., 97, 216892t, 216893u, 216894v.
Chem. Abstracts, 59, 516d, (1963).
English Language Translation of German Patent Disclosure 1229 101.

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