Abstract: Aromatic polycarbonates end-capped with branched alkyl acyl halides and/or acids from four to seven carbon atoms, inclusive, provide higher heat resistance and better impact resistance after aging at elevated temperature compared with normal alkyl acyl agents. The resins of the invention are injection molded.

Abstract: Aromatic polycarbonate chain terminated with a cyclic ester.

Abstract: Copolyester-carbonate resins, and articles molded therefrom, exhibiting improved processability comprising the reaction product of; (i) at least one dihydric phenol; (ii) a carbonyl halide carbonate precursor; (iii) at least one difunctional carboxylic acid or a reactive derivative thereof; and (iv) at least one bishaloformate represented by the general formula ##STR1## wherein X represents a halogen radical and R represents an alkylene radical, said bishaloformate being present in an amount effective to improve the processability of said resin.

Abstract: Polycarbonates are flame retarded with novel mixture of metal salts of sulfonated di-p-cumyl-phenyl carbonate.

Abstract: A thermoplastic molding composition having improved impact strength and flame retardency comprising an intimate blend of a polysulfone and a copolyester-carbonate.

Abstract: A thermoplastic polycarbonate molding composition containing a particulate filler coated with a silane.

Abstract: A polycarbonate composition having improved melt flow and improved impact strength after aging at elevated temperatures comprising polycarbonate resin with polyolefins and a polyorganosiloxane. A preferred composition comprises in admixture a high molecular weight aromatic carbonate polymer and a minor amount of a polyolefin and a polydimethylsiloxane fluid.

Abstract: A polyester-carbonate polymer containing benzoate or substituted benzoate ester terminal groups.

Abstract: Flame-retarded, reinforced and unreinforced thermoplastic compositions having improved arc resistance are provided comprising a high molecular weight linear polyester, such as poly(1,4-butylene terephthalate) and the like, a flame-retarding amount of a flame-retardant, such as a halogenated aromatic polycarbonate, and novaculite. A process for improving the arc resistance of reinforced or unreinforced flame-retardant polyester compositions is also provided, the process comprising admixing novaculite with a high molecular weight linear polyester and a flame retardant.