Abstract: Branched polycarbonate prepolymers are produced by adding phosgene, one or more dihydric phenols, one or more polyhydric phenols, a halogenated organic solvent, and an aqueous caustic solution together with mixing in motionless mixers to form fine dispersions of partially phosgenated phenols, allowing for interfacial reactions to occur in residence time sections and repeating the steps after the addition of caustic to form high molecular weight prepolymers. These prepolymers are then polymerized with amines to form branched high molecular weight polycarbonates.

Abstract: Ignition resistant non-haloaromatic containing thermoplastic polymer compositions are disclosed which are mixtures of (1) a non-carbonate polymer such as a polyester terephthalate, a polyacetal, a polymethylmethacrylate and the like, (2) a carbonate polymer, or (3) a blend of (1) and (2) with a high elastic memory polytetrafluoroethylene, an organic phosphate, and a metal salt of an inorganic acid.

Abstract: A composition of matter, being an admixture of polycarbonate and an aliphatic thio compound, molded articles of which release cleanly from, and without adhesion to, a mold.

Abstract: An ignition resistant carbonate polymer composition comprising a mixture of one or more carbonate polymers, and a high elastic memory polytetrafluoroethylene having a heat shrinkage equal to or greater than 15% with or without one or more organo phosphorous compounds.

Abstract: High molecular weight polyhalobisphenol polycarbonates are produced by adding phosgene to a polyhalobisphenol in the alkali metal phenate form whereby the chloroformates of the bisphenol are formed and then adding an activated pyridine such as 4-aminopyridines or 2-substituted pyridines to generate a high molecular weight polycarbonate having an inherent viscosity in the range from about 0.4 to about 0.9.