Abstract: The invention is a catalytic ion exchange resin bed with low pressure drop, low catalyst breakage and low catalyst deactivation as well as an improved process for the production of bisphenol A employing such a catalytic ion exchange resin bed.

Abstract: The invention is a catalytic ion exchange resin bed with low pressure drop, low catalyst breakage and low catalyst deactivation as well as an improved process for the production of bisphenol A employing such a catalytic ion exchange resin bed.

Abstract: Copolymers comprising amide units and ester units are prepared by melt phase interchange of diaryl esters of dicarboxylic acids and diamines with dihydric alcohols and diesters of aromatic dicarboxylic acids. The products are tough resins, useful per se as molding compounds, and to compatibilize and toughen other thermoplastic polymers.

Abstract: A method is provided for regenerating deactivated sulfonated aromatic organic ion-exchange resin beds, such as a polystyrene ion-exchange resin bed, having chemically combined amino organo mercaptan groups with anhydrous phenol at an elevated temperature.

Abstract: A method is provided for making bisphenol by condensing a ketone and a phenol in the presence of a sulfonated aromatic organic polymeric ion-exchange catalyst having aminoorganomercaptan groups using a phenol having less than 1 ppm of hydroxyacetone.

Abstract: Copolymers comprising amide units and ester units are prepared by melt phase interchange of diaryl esters of dicarboxylic acids and diamines with dihydric alcohols and diesters of aromatic dicarboxylic acids. The products are tough resins, useful per se as molding compounds, and to compatibilize and toughen other thermoplastic polymers.

Abstract: A method is provided for depolymerizing scrap aromatic polycarbonate to salvage component monomers by initially effecting aromatic polycarbonate depolymerization by basic phenolysis to produce a mixture having dihydric phenol, and diarylcarbonate. Recovery of the dihydric phenol is effected by distillation of a crystalline dihydric phenol/phenol adduct. Diarylcarbonate is recovered by distillation of the resulting mother liquor after carboxylic acid treatment.

Abstract: A method for making aromatic organic carbonate, such as diphenyl carbonate is provided which employs a transition metal catalyst in the form of a palladium catalyst mixture. The palladium catalyst can be used in combination with an organic cocatalyst, such as a terpyridine and a cobalt cocatalyst in the form of a cobalt complex containing a pentadentate ligand. The aromatic organic carbonate is separated from the carbonylation reaction mixture as a 1:1 molar adduct of aromatic organic carbonate such as diphenyl carbonate and aromatic organic hydroxy compound, such as phenol. The transition metal catalyst has been found to be recyclable allowing for the introduction of make up aromatic organic hydroxy compound into the reactor under ambient conditions.

Abstract: Thermoplastic blends of a polyamide having low amine end-group concentration and a polymer containing ester or carbonate linkages. The blends are useful in providing molded parts having improved properties such as improved impact strength.

Abstract: Phenolic solutions of 20%-70% by weight of diphenylcarbonate have been found to form a crystalline 1:1 molar adduct of diphenylcarbonate and phenol when allowed to cool to a temperature between about 50.degree. C. and 25.degree. C. Recovery of the crystalline 1:1 molar adduct followed by distillation of phenol therefrom has been found to provide substantially pure diphenylcarbonate.

Abstract: Copolymers comprising amide units and urea units are prepared by melt phase interchange of diaryl esters of dicarboxylic acids with diamines and diesters of carbonic acid with diamines. The products are tough resins, useful per se as molding compounds, or in blends with other thermoplastic polymers.

Abstract: An aromatic polyphthalatecarbonate resin having a small percentage of phthalate units therein exhibits improved resistance to hazing and yellowing upon exposure to ultraviolet radiation. The polyphthalate carbonate resin is derived from the reaction products of a phthalate compound, a dihydric phenol and a carbonate precursor.

Abstract: Polyamides obtained by low pressure melt processing involving reactions of diesters of dicarboxylic acids with 1,3-diaminopropane. The polyamides are useful as molding resins.

Abstract: A process for minimizing the formation of color during preparation of polyamides by interchange of diesters of dicarboxylic acids with diamines in the presence of hypophosphorous acid.

Abstract: Scrap poly(ethyleneterephthalate) is converted to useful amine and diamine monomers such as para-xylylenediamine, 1,4-bis(aminomethyl)cyclohexane and 4-aminomethyl benzoic acid for the production of various polyamides. The conversion of poly(ethyleneterephthalate) to diamine monomers is achieved by a three step process involving (a) ammonolysis of the poly(ethyleneterephthalate) to produce terephthalamide and ethylene glycol; (b) pyrolytic dehydration of the terephthalamide to produce terephthalonitrile; and (c) hydrogenation of the terephthalonitrile to produce the para-xylylene diamine and/or 1,4-bis(aminomethyl)cyclohexane. The conversion of poly(ethyleneterephthalate) to 4-aminomethyl benzoic acid involves the steps of (a) ammonolysis of the poly(ethyleneterephthalate) to produce terephthalamide; (b) partial pyrolytic dehydration of said terephthalamide to produce 4-cyanobenzoic acid; and (c) hydrogenation of said 4-cyanobenzoic acid to produce 4-aminomethylbenzoic acid.

Abstract: A container comprised of an inner aromatic polycarbonate layer, an outer aromatic polycarbonate layer, and an intermediate amorphous polyamide layer between the inner polycarbonate layer and the outer polycarbonate layer. The amorphous polyamide intermediate layer provides the container with enhanced processability, excellent gas barrier properties and hot fill capabilities.

Abstract: A polyphthalatecarbonate/polycarbonate blend exhibits improved resistance to hazing and yellowing from prolonged exposure to ultraviolet radiation. The blend is useful in the production of transparent, ultraviolet radiation stable sheets and films.

Abstract: Copolymers comprising amide units and urea units are prepared by melt phase interchange of diaryl esters of dicarboxylic acids with diamines and diesters of carbonic acid with diamines. The products are tough resins, useful per se as molding compounds, or in blends with other thermoplastic polymers.

Abstract: Thermoplastic compositions of a polyamide with a thermoplastic polyester, polycarbonate, poly(ester carbonate) or polyarylate resin compatibilized with a polyamide-polyester block copolymer have excellent physical properties after molding and show no evidence of delamination.

Abstract: Thermoplastic blends of polyamide with at least one resin selected from the group consisting of polycarbonate, poly(ester carbonate) and polyarylate are compatibilized with an effective amount of a polyamide-polyarylate block copolymer and molded into articles having excellent physical properties with little or no evidence of delamination.