Abstract: Compositions are provided which comprise (A) a polyester resin which comprises the reaction product of at least one straight chain, branched, or cycloaliphatic C.sub.2 -C.sub.10 alkane diol or chemical equivalent thereof, and a cycloaliphatic diacid or chemical equivalent thereof; and (B) an effective impact strength or tensile property modifying amount of a substantially amorphous copolymer resin. These compositions are homogeneous and exhibit excellent light stability, chemical resistance, particularly to gasoline and similar automotive chemicals, excellent impact strength even at low temperatures and excellent tensile properties.

Abstract: Novel polyesterification catalysts comprising a phosphorus component and a titanium component are disclosed which are useful in preparing improved blends of polyester and polycarbonate resins.

Abstract: Copolyester compositions are provided which comprise the reaction product of at least one straight chain, branched, or cycloaliphatic C.sub.2 -C.sub.10 alkane diol or a chemical equivalent thereof, a mixture of at least two cycloaliphatic diacids or chemical equivalents thereof, the mixture comprising predominantly a trans-enantiomer, and at least one aromatic diacid or a chemical equivalent thereof. These copolyesters have superior ductility to the homopolymers of the diol component and either of the diacid components.

Abstract: Copolyester compositions are provided which comprise the reaction product of at least one straight chain, branched, or cycloaliphatic C.sub.2 -C.sub.10 alkane diol or a chemical equivalent thereof, a mixture of at least two cycloaliphatic diacids or chemical equivalents thereof, the mixture comprising predominantly a trans-enantiomer, and at least one aromatic diacid or a chemical equivalent thereof. These copolyesters have superior ductility to the homopolymers of the diol component and either of the diacid components.

Abstract: Compositions are provided which comprise a polyester resin which comprises the reaction product of at least one straight chain, branched, or cycloaliphatic C.sub.2 -C.sub.10 alkane diol or chemical equivalent thereof; and a cycloaliphatic diacid or chemical equivalent thereof; and a poly(ether ester) elastomer, a poly(etherimide ester) elastomer, a copolymer elastomer comprising (ether ester) monomers and (etherimide ester) monomers, a copolymer comprising ethylene and one or more comonomers copolymerizable therewith to provide a solid copolymer, or a combination of any of the foregoing. These compositions have excellent tensile properties.

Abstract: Novel thermoplastic block carbonate-carboxylate copolyesters useful in films and molded articles are prepared by the interesterification of (a) high molecular weight aromatic carbonate polymers and (b) a copolyester of a linear aliphatic dicarboxylic acid and, optionally, an aromatic dibasic acid such as terephthalic or isophthalic acid with one or more straight or branched chain dihydric aliphatic glycols, or with a block copolyester of poly(1,4-butylene terephthalates) and polybutylene oxide or an aromatic/aliphatic polyester, a mixture of poly(1,4-butylene terephthalate) and a polyester of a linear aliphatic dicarboxylic acid and a branched chain dihydric aliphatic glycol or a poly(butylene oxide).

Abstract: A novel process is disclosed for preparing a high melt viscosity block co-polyester of at least two different linear polyesters. The process comprises melt blending the polyesters and, thereafter, subjecting the melt blended polyesters to a temperature of 10.degree.-50.degree. C. below the melting point of the lowest melting ingredient in the blend until the melt viscosity has increased to at least 10,000 poises at a temperature 10.degree.-15.degree. C. above the melting point of the blend.

Abstract: The inter-layer adhesion of laminates comprised of alternating layers of thermoplastic polyester and ethylene-vinyl acetate copolymer is greatly enhanced by a method of treatment of the laminate with a stream of inert gas at elevated temperatures which is described. The treated articles in general exhibit a T-peel strength of 1 in. lb./in..sup.2 and greater, which is far in excess of the peel strengths typical of the untreated article.

Abstract: Shaped articles comprising a branched, high molecular weight poly(alkylene terephthalate) polyester resin and obtained by providing a molten, self-supporting preform of the resin, shaping the molten preform into a final form and allowing the shaped preform to cool to structural rigidity.

Abstract: Poly(butylene terephthalates) are prepared by an improved process which makes it possible to directly esterify terephthalic acid and 1,4-butanediol without excessive loss of the diol reactant to side reactions. In the process, the conditions are controlled to promote rapid removal of the water as formed. It is also advantageous to minimize the contact time between 1,4-butanediol and terephthalic acid. Illustratively, 1,4-butanediol will be heated to 175.degree.-275.degree. C., terephthalic acid is gradually added, and byproduct water is removed as formed. In another embodiment, a mixture of terephthalic acid and an excess of 1,4-butanediol is heated and byproduct water is removed by entrainment in the excess 1,4-butanediol distilled from the reaction zone.

Abstract: A thermoplastic molding composition having improved physical properties is provided, the composition comprising an intimate admixture of a high molecular weight polyester, from about 0.1 to about 25% by weight, based on the total composition, of a copolymer of ethylene and vinyl acetate and a filler, said composition having been prepared by melt blending the polyester, the copolymer and the filler and further reacting the resultant blend in the solid state.

Abstract: Poly(1,4-butylene terephthalate) resins filled with mineral fillers show substantial improvement in impact strength, distortion temperature under load, and flexural strength if the individual particles of the filler, e.g., mica, are coated with unsintered poly(tetrafluoroethylene) resin.

Abstract: Novel thermoplastic copolyesters useful in fibers, films and molding resins are prepared by the transesterfication of (a) straight or branched chain poly(1,4-butylene terephthalates) and (b) a polyester of (i) a cycloaliphatic 1,2-dicarboxylic acid or a derivative thereof, etc., and (ii) 1,4-butanediol. Compositions comprising the new copolymers with high molecular weight poly(1,4-butylene terephthalates) and with reinforcing agents are also disclosed.

Abstract: A novel melt polymerization process is disclosed for increasing the molecular weight of poly(1,4-butylene terephthalate). This process comprises adding a compound containing at least two aliphatic or cycloaliphatic hydroxyl groups to a low molecular weight poly(1,4-butylene terephthalate) and thereafter melting the polymer in a vacuum until the desired molecular weight is reached.

Abstract: The melt viscosity of high molecular weight linear polyesters is stabilized in the presence of aromatic (poly-)carbonates by adding a minor proportion of a non-volatile monofunctional ester-forming compound to a mixture of glycol and terephthalate or isophthalate reactants and heating the resulting mixture. The products of the process are suitable for conversion to compositions with aromatic (poly-)carbonates, especially flame retarded such compositions, where stabilized melt viscosity during fabrication is critical.

Abstract: An improved process for the solid state polymerization of branched copoly(alkylene terephthalates) comprises carrying out the polymerization of the branched copolyester in intimate admixture with a small amount of an aromatic (poly-) or (copoly-)carbonate resin in an inert atmosphere. The aromatic (poly-) or (copoly-)carbonate resin accelerates the achievement of high melt viscosity.

Abstract: A process for the preparation of branched poly(alkylene terephthalates) and mixtures of poly(alkylene terephthalates) is disclosed. The process comprises intimately blending the linear polyesters with a branching component, transforming the blend to a particulate state, and solid state polymerizing until a copolyester having the desired molecular weight is achieved.

Abstract: Novel thermoplastic copolyesters useful in molding resins are prepared by the interesterification of (a) diaromatic acids and diols and/or reactive derivatives thereof or terminally-reactive straight, branched or alicyclic poly(alkylene glycol aromatic acid esters) and (b) a terminally-reactive di-ester comprising an aromatic diol. Compositions comprising the new modified copolymers produce molded articles with superior impact strength, higher heat deflection temperatures, and modified crystallization behavior. Also disclosed are embodiments including reinforcing agents, and/or flame retardant agents.

Abstract: The melt viscosity of high molecular weight linear polyesters is stabilized in the presence of aromatic (poly-)carbonates by adding a minor proportion of a non-volatile monofunctional ester-forming compound to a mixture of glycol and terephthalate or isophthalate reactants and heating the resulting mixture. The products of the process are suitable for conversion to compositions with aromatic (poly-)carbonates, especially flame retarded such compositions, where stabilized melt viscosity during fabrication is critical.

Abstract: Poly(alkylene terephthalates) are prepared by an improved process which provides high molecular weight, in a shortened reaction time, without excessive loss of the diol reactant to side reactions. In the process an excess of the diol reactant is heated with a mixture of the corresponding dialkyl terephthalate and from 5 to 95 mole % of terephthalic acid, based on the mixture.