Method for preparing cyclic polycarbonate oligomer mixtures

Details Method for preparing cyclic polycarbonate oligomer mixtures Method for preparing cyclic polycarbonate oligomer mixtures

1986-06-06

1988-02-23

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...

528370, 528372, 528373, 549 1, 549228, C08G 6362

Patent

active

047271345

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. Polymerization may be conducted simultaneously with molding, extrusion and the like. The oligomer mixtures are adaptable to the preparation of filled prepregs.

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patent: 3274214 (1966-09-01), Prochaska
patent: 3297634 (1967-01-01), Oxenrider et al.
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patent: 3386954 (1968-06-01), Schnell et al.
patent: 3422119 (1969-01-01), Prochaska
patent: 4644053 (1987-02-01), Brunelle et al.
Schnell et al., Makromol. Chem., 57, 1-11 (1962).
C.A., 97 21689t, 216893u, 216894v (1982).

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