Abstract: Copolyesters of terephthalic acid, phenylhydroquinone and 25 to 50 mole percent hydroquinone based on total moles of diol. These copolyesters are characterized by unexpected chemical resistance.

Abstract: Process for the preparation of polyesters and poly(ester-carbonates) comprising heating aromatic diol polycarbonates and esters of dicarboxylic acids in the presence of ester exchange and polymerization catalysts.

Abstract: Disclosed are crystalline polyesters having low melt viscosities and thermosetting compositions comprising these polyesters. The compositions are especially useful as powder coatings. The polyesters are derived from 1,4-butanediol and trans-1,4-cyclohexanedicarboxylic acid. The polyesters are characterized as having a molecular weight of about 700-3000, a melt viscosity of about 50-3500 cps at 160.degree. C. and a hydroxyl number of about 35-160. The thermosetting composition contains a curing agent which is reactive with the hydroxyl groups to crosslink the polyester.

Abstract: Process for preparation of poly(ester-carbonates) from aromatic diol bis(alkylcarbonates) and esters of dicarboxylic, and/or carboxylate-carbonate esters of hydroxy acids by suitably heating the reactants in the presence of a suitable polymerization catalyst.

Abstract: Polymers and copolymers derived from at least 20 mole percent 1,4-cyclohexanedicarboxylic acid of which at least 80 mole percent is trans-1,4-cyclohexanedicarboxylic acid, up to 80 mole percent terephthalic acid, terephthalic acid substituted with 1 or 2 chlorine or bromine atoms or an alkyl group containing 1 to 4 carbon atoms, 2,6-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid substituted with 1 or 2 chlorine or bromine atoms or an alkyl group containing 1 to 4 carbon atoms, at least 20 mole percent phenylhydroquinone, 0-45 mole percent hydroquinone and 0-35 mole percent of a hydroquinone substituted with 1 or 2 chlorine or bromine atoms or an alkyl group containing 1 to 4 carbon atoms.

Abstract: Process for the preparation of polyesters and poly(estercarbonates) comprising heating, preferably with a suitable catalyst, aromatic diol polycarbonates and esters of cycloaliphatic or aromatic dicarboxylic acids. The polymers may contain 5-100 mole percent dicarboxylate moiety, based on total acids. The products have utility as molding plastics, fibers, films, adhesives, coatings, extruded shapes, etc. The hydroxy-terminated prepolymer obtained in the first step may be reacted with a diisocyanate to form a polyurethane.

Abstract: A new process for the preparation of poly-1,4-cyclohexanedicarboxylate polyesters having high (>80%) trans isomer content comprises heating in the presence of a suitable catalyst an ester of trans-1,4-cyclohexanedicarboxylic acid and a diacyl derivative of an aromatic diol.

Abstract: Provess for improving the chemical resistance of copolyesters derived from aromatic dicarboxylic acids, certain substituted aromatic diols and, optionally, aromatic hydroxy acids. The process involves treating shaped objects made from the aromatic polyesters by subjecting them to a temperature sufficient to raise the surface temperature thereof to at least 275.degree. C. and preferably 300.degree. C. in air or other oxygen-containing atmospheres.

Abstract: Thermoplastic copolyester compositions prepared from combination of a bisphenol A polyester and a copolyester of poly(ethylene terephthalate) modified with 1,4-cyclohexanedimethanol. The compositions are characterized by excellent melt processability, high impact strength, and flexural modulus that is higher than that of either of the polymers used in the preparation of the thermoplastic copolyester compositions.

Abstract: This invention relates to a process for the preparation of thermoplastic polymers. Specifically it relates to a process for the preparation of a substantially linear, high molecular weight phenoxy resin from hydroquinone, optionally up to about 20 mole percent of a second aromatic diol, epichlorohydrin (or another epihalohydrin) and a base, such as sodium hydroxide.Hydroquinone phenoxy resin is characterized by low permeability to oxygen and carbon dioxide and is, therefore, useful as a gas-barrier layer in multilayer plastic film constructions used in food-packaging and beverage bottle applications, for example. For use in such applications, the resin is generally in the form of a thin, uniform film prepared by extrusion, casting, or other such method. It is highly desirable that polymers used in this manner be as free as possible from chain branches or crosslinks, as these lead to the formation of gel particles which cause imperfections in the polymer film.

Abstract: Disclosed is a process for preparing linear, high molecular weight copolyesters from either (A) polyesters or copolyesters, the acid component of which consists of at least 70 mole percent terephthalic acid and the diol component of which consists of at least 70 mole percent ethylene glycol or (B) copolyesters, the acid component of which consists of at least 70 mole percent terephthalic acid and the diol component of which consists of at least 70 mole percent of a mixture of ethylene glycol and 1,4-cyclohexanedimethanol in a mole ratio of from 20:80 to 97:3, the process comprising heating the polymer in the presence of 1,4-cyclohexanedimethanol to glycolize the polymer, distilling out ethylene glycol from the glycolysis mixture, and polycondensing the glycolysis mixture to form a copolyester of which at least a portion of ethylene glycol units are replaced by 1,4-cyclohexanedimethanol units.

Abstract: Disclosed are liquid crystal copolyesters having excellent mechanical properties. The copolyesters are prepared from an aromatic dicarboxylic acid, phenylhydroquinone and a p-acyloxybenzoic acid.

Abstract: Copolyesters of terephthalic acid, phenylhydroquinone and 25 to 65 mole percent t-butylhydroquinone based on total moles of diol. These copolyesters are characterized by high melting points, good melt processability, high heat resistance and high oxidative stability. The copolyesters are useful for the manufacture of melt-spun fibers, extruded films and injection molded articles.

Abstract: Disclosed are liquid crystal copolyesters having melting points low enough to allow the copolyesters to be melt-processed in conventional equipment.

Abstract: This invention concerns fibers of amorphous polyesters of terephthalic acid or an ester forming derivative thereof and from about 60 mole percent to 100 mole percent 1,2-propylene glycol and from 0 to about 40 mole percent ethylene glycol. These fibers are useful for the production of bonded coherent cigarette filters, nonwoven fabrics and the like.

Abstract: Disclosed are poly(ester-amides) prepared from an aromatic dicarboxylic acid, ethylene glycol and a p-acylaminobenzoic acid.

Abstract: This invention concerns fibers of amorphous polyesters of terephthalic acid or an ester forming derivative thereof and from about 60 mole percent to 100 mole percent 1,2-propylene glycol and from 0 to about 40 mole percent ethylene glycol. These fibers are useful for the production of bonded coherent cigarette filters, nonwoven fabrics and the like.

Abstract: Disclosed are liquid crystal copolyesters having melting points low enough to allow the copolyesters to be melt-processed in conventional equipment.

Abstract: Disclosed are liquid crystal copolyesters having melting points low enough to allow the copolyesters to be melt-processed in conventional equipment.

Abstract: Disclosed are liquid crystal copolyesters prepared from an aromatic dicarboxylic acid, a substituted hydroquinone and resorcinol.