Abstract: A composition with increased resistance to environmental stress cracking and crazing comprising a blend of (a) an aromatic carbonate polymer resin and (b) an effective amount of a coupled resin block copolymer of polymerized vinyl aromatic units connected to polymerized diene units.

Abstract: Thermoplastic molding compositions are described which comprise an admixture of (a) an aromatic polycarbonate resin, (b) an olefinic polymer or copolymer and (c) a third component which is a copolymer of an olefin and an acrylate, methacrylate, acrylic acid or methacrylic acid. The presence of the third component enhances impact strength in thicker sections and improves weld line strength.

Abstract: Novel copolyester-carbonates exhibiting improved processability comprised of the polymerized reaction products of (i) at least one dihydric phenol, (ii) at least one difunctional carboxylic acid or a reactive derivative thereof, (iii) a carbonyl halide carbonate precursor, and (iv) a processability improving amount of at least one particular bishaloformate.

Abstract: A composition useful for improving impact strength of an aromatic copolyester carbonate having isophthalate units comprising the said aromatic copolyester carbonate and impact modifier useful in impact modifying aromatic polycarbonate.

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

Abstract: Novel heat resistant polycarbonates are provided which are the polymerized reaction products of:(i) a carbonate precursor; and(ii) at least one dihydric phenol selected from dihydric phenols represented by the general formulae ##STR1## wherein: each R.sup.1 is independently selected from halogen radicals, monovalent hydrocarbon radicals, and monovalent hydrocarbonoxy radicals;each R.sup.2 is independently selected from halogen radicals, monovalent hydrocarbon radicals, and monovalent hydrocarbonoxy radicals;R.sup.4 and R.sup.5 are independently selected from monovalent hydrocarbon radicals;R.sup.3 is selected from hydrogen and monovalent hydrocarbon radicals, with the proviso that if R.sup.3 is a hydrogen radical than at least one of the monovalent hydrocarbon radicals represented by R.sup.4 and R.sup.5 contains at least two carbon atoms;R.sup.7 is selected from hydrogen and monovalent hydrocarbon radicals;R.sup.

Abstract: Thermoplastic molding compositions are described which comprise a miscible admixture of (a) an aromatic polycarbonate resin, (b) an olefinic polymer or copolymer and a minor amount of (c) a third component which is an acrylic polymer. The presence of the acrylic polymer permits the incorporation of amounts of component (b) in excess of 10 parts by weight per 100 parts by weight of (a) and (b) together to improve the stress cracking resistance without normally attendant loss in ductility.

Abstract: Novel polyphenolic compounds are disclosed. These compounds have utility as branching agents in the production of novel, randomly branched polycarbonates.

Abstract: Novel compositions with high resistance environmental stress cracking and crazing comprise:(a) an aromatic carbonate polymer; and(b) a modifier combination therefor comprising:(i) a coupled resinous block copolymer of polymerized vinyl aromatic compound and a polymerized diene;(ii) an olefin-acrylate or methacrylate copolymer; and(iii) a precompounded homogeneous resin composition, compatible under working conditions, comprising an olefinic resin and an elastomeric polyisobutylene resin.

Abstract: Multilayered hollow polycarbonate containers comprised of:(i) at least one inner polycarbonate layer;(ii) at least one outer polycarbonate layer; and(iii) at least one intermediate layer between said inner polycarbonate layer and said outer polycarbonate layer comprised of a thermoplastic resin exhibiting gas-barrier properties.The containers are formed by coextrusion blow-molding.

Abstract: A method for detecting the stoichiometric end point of a preparation of aromatic polycarbonate resin involving the use of phosgene and an organic solvent in which the phosgene is normally soluble which comprises detecting the increase of phosgene gas occurring in the vapor phase of the reactor at or following achievement of the stoichiometric end point of the aromatic polycarbonate preparation.

Abstract: A flame retardant non-opaque polycarbonate composition consisting essentially of, in admixture:(i) at least one halogen-free and sulfur containing aromatic polycarbonate resin derived from(a) at least one halogen-free and sulfur-free non-polycyclic dihydric phenol,(b) from about 4 to about 25 mole percent of at least one halogen-free thiodiphenol, based on the total amount of said halogen-free and sulfur-free non-polycyclic dihydric phenol and said halogen-free thiodiphenol employed, and(c) a carbonate precursor; and(ii) from about 0.001 to about 0.5 parts by weight per hundred parts by weight of said polycarbonate resin of at least one organic metal salt of sulfonic acid selected from the alkali and alkaline earth metal salts of sulfonic acids.

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: Copolyester-carbonates having amide and carbamate terminal groups. These copolyester-carbonates are prepared by reacting (i) a carbonate precursor, (ii) at least one difunctional carboxylic acid or an ester forming reactive derivative thereof, (iii) at least one dihydric phenol, and (iv) a chain terminating amount of at least one carbamate-amide precursor. These copolyester-carbonates exhibit improved thermal stability.

Abstract: Novel compositions with improved resistance to environmental stress cracking and crazing comprising(a) an aromatic carbonate polymer; and(b) a modifier combination therefor comprising(i) a thermoplastic olefin polymer insoluble therein; and(ii) a linear low density polyolefin.

Abstract: A method of preparing a polymer mixture comprising polyvinyl chloride, an aromatic polycarbonate and a rubber like polymeric, characterized in that first a premixture comprising 60-90% by weight of aromatic polycarbonate and 10-40% by weight of rubber like polymer is prepared by mixing at a temperature above about 220.degree. C., after which the resulting premixture is cooled to a temperature below about 220.degree. C. and is mixed with the polyvinyl chloride.

Abstract: Copolyester-carbonate blends exhibiting improved processability comprised of, in admixture:(i) at least one copolyester-carbonate resin; and(ii) a processability improving amount of at least one halogenated polycarbonate resin.

Abstract: A polymer mixture comprising polyvinyl chloride, an aromatic polycarbonate and a rubber like polymer, characterized in that the rubber like polymer is a graft copolymer which is built up from a rubber like main chain with predominantly alkyl acrylate units on which styrene, .alpha.-methylstyrene, acrylonitrile, methacrylic acid esters, acrylic acid esters or mixtures thereof have been grafted.

Abstract: Copolyester-carbonate resins exhibiting improved processability which are derived from:(i) at least one diester-diol which is the coreaction product of an aromatic hydroxy carboxylic acid or an ester forming reactive derivative thereof and a diol;(ii) at least one dihydric phenol;(iii) at least one bishaloformate; and(iv) a carbonyl halide carbonate precursor.

Abstract: This application discloses novel thermoplastic polycarbonate molding compositions which include a multiphase composite interpolymer; a copolymer of acrylonitrile, butadiene and an alkenyl aromatic compound; and an olefin-acrylate copolymer.