Abstract: Novel compositions with high impact strength in both thin and thick-walled sections, and good weld line strength at room temperatures are provided in the form of resinous mixtures comprising:(A) an aromatic carbonate polymer resin selected from the group consisting of(i) an aromatic polycarbonate resin,(ii) a poly(ester-carbonate) copolymer resin, and(iii) a mixture of (i) and (ii); and(B) an impact modifier combination therefor comprising(i) a polyester resin selected from the group consisting of(a) a poly(alkyene terephthalate) resin, when (A) is (i) or (iii); and(b) an amorphous copolyester copolymer resin, and(c) a mixture of (a) and (b); and(ii) a diene based, grafted core-shell copolymer.

Abstract: Novel compositions with high room temperature impact strength, high impact strength in thick-walled sections, and good weld line strength are provided in the form of resinous mixtures comprising:(a) an aromatic carbonate polymer resin selected from the group consisting of(i) an aromatic polycarbonate resin,(ii) a poly(ester-carbonate) copolymer resin, and(iii) a mixture of (i) and (ii);(b) a polyester resin selected from the group consisting of(i) a poly(alkylene terephthalate) resin,(ii) an amorphous copolyester copolymer resin, and(iii) a mixture of (i) and (ii); and(c) a minor amount of an impact modifier combination therefor comprising:(i) a multiphase composite interpolymer; and(ii) a copolymer of an olefin with an acrylate or methacrylate comonomer.

Abstract: A glass free copolyester-carbonate composition exhibiting improved resistance to mild organic solvents comprising, in admixture:(i) at least one high molecular weight thermoplastic aromatic copolyester-carbonate resin containing from about 25 to about 90 mole percent ester bonds;(ii) at least one amorphous polyester resin containing the reaction products of(a) at least one polyol selected form 1,4-cyclohexanedimethanol or a mixture of 1,4-cyclohexanedimethanol and ethylene glycol, and(b) at least one aromatic dicarboxylic acid or its ester forming reactive derivative selected from isophthalic acid, terephathalic acid, or mixtures thereof; and(iii) at least one polymer selected from(a) an olefin acrylate copolymer,(b) a polyolefin, and(c) an olefin diene terpolymer;components (ii) and (iii) being present in amounts at least effective to impart to said composition a resistance to mild organic solvents greater than that possessed by said copolyester-carbonate resin.

Abstract: Copolyester-carbonate composition exhibiting improved resistance to organic solvents comprising, in admixture:(i) at least one aromatic copolyester-carbonate resin;(ii) at least one aromatic polycarbonate resin;(iii) at least one selectively hydrogenated block copolymer of a vinyl aromatic compound and an olefinic elastomer; and(iv) at least one polymer selected from an olefin acrylate copolymer, an olefin diene terpolymer, or mixtures thereof. The instant composition also exhibits improved impact properties and relatively high heat resistance.

Abstract: Copolyester-carbonate resin containing composition comprising, in physical admixture:(i) at least one aromatic copolyester-carbonate resin;(ii) at least one aromatic polycarbonate resin;(iii) at least one amorphous polyester resin; and(iv) at least one polymer selected from(a) an olefin acrylate copolymer,(b) a polyolefin, and(c) an olefin diene trepolymer.This composition contains amounts of components (ii)-(iv) effective to improve the resistance to mild organic solvents and the impact properties of the copolyester-carbonate resin.

Abstract: A copolyestercarbonate composition, comprising:a dihydric phenol,a carbonate precursor, andan aromatic dicarboxylic acid or derivative thereof selected from the group consisting of terephthalic acid and acid derivatives, and a mixture of isophthalic and terephthalic acids, and acid derivatives with the mole ratio of isophthalic to terephthalic of about 0.1:9.9 to about 3:7said copolyestercarbonate containing from about 20 mole percent to about 50 mole percent ester content.

Abstract: Good impact resistance is obtained with blends of polycarbonate and aromatic copolyester carbonate with preferred composition exhibiting a substantial ductile failure mode at break.

Abstract: A flame retarded black thermally and hydrolytically stabilized copolyester carbonate having reasonable melt stability is achieved with a relatively low surface area carbon black.