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AssigneeGeneral Electric Company
InventorsDaniel J. Brunelle, Thomas L. Evans, Michael A. Vallance, Kevin R. Stewart, Thomas G. Shannon, David A. Williams, Dwight J. Patterson, Niles R. Rosenquist, William Hilakos
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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.
A method for preparing a resinous composition which comprises contacting with a polycarbonate formation catalyst, at a temperature up to about 350.degree. C., a composition consisting essentially of a mixture of cyclic oligomers having varying degrees of polymerization from 2 to about 30, the structural units in said oligomers having the formula ##STR3## wherein each R is independently a divalent aliphatic, alicyclic or aromatic radical and each Y.sup.1 is independently oxygen or sulfur.
A method for the preparation of a crosslinked resinous composition which comprises contacting with a polycarbonate formation catalyst and an organophilic free radical initiator, at a temperature up to about 350.degree. C., a composition consisting essentially of a mixture of cyclic oligomers having varying degrees of polymerization from 2 to about 30, the structural units in said oligomers having the formula ##STR4## wherein each R is independently a divalent aliphatic, alicyclic or aromatic radical and each Y.sup.1 is independently oxygen or sulfur;
A prepreg composition comprising a filler and a composition consisting essentially of a mixture of cyclic oligomers having varying degrees of polymerization from 2 to about 30, the structural units in said oligomers having the formula ##STR5## wherein each R is independently a divalent aliphatic, alicyclic or aromatic radical and each Y.sup.1 is independent oxygen or sulfur.
Dependencies are inferred from the claim text.