A method for preparing a polycarbonate ester includes feeding a monomer mixture containing (i) at least one compound selected from the group consisting of compounds of the following Formulae 1 and 3; (ii) a compound of the following Formula 2; and (iii) a 1,4:3,6-dianhydrohexitol to a polycondensation reactor and allowing the monomers and the 1,4:3,6-dianhydrohexitol to react to prepare the polycarbontate ester. The prepared polycarbonate ester has improved mechanical properties including tensile strength and impact strength: ##STR00001##

An amorphous polyester or copolyester composition comprises the reaction product of a crystalline or semicrystalline polyester or copolyester, optionally derived from a recycled waste stream, at least one diol or aromatic diacid or an ester of a diacid or a hydroxycarboxylic acid or a lactone or a dianhydride, and a catalyst, wherein the amorphous composition has a weight average molecular weight of at least 10,000 g/mol (polystyrene equivalent molecular weight) as measured by gel permeation chromatography.

A polyester polymer is polymerized from an alcohol component including a diol and a polyol and an acid component including terephthalic acid and isophthalic acid, with the terephthalic acid and isophthalic acid present in a desired molar ratio. The polyester polymer also includes carboxylic acid functional groups, a weight average molecular weight (MW) of at least 5000 Daltons (Da), and an acid value (AV) of 40 to 65. The polyester polymer may be formulated into a water-based coating composition for substrates such as articles of cookware to form a coating that is highly heat resistant and flexible while also providing non-stick properties with good release.

The present disclosure relates to a method for continuously manufacturing an ester-based composition and a manufacturing system therefor, the method improving a manufacturing yield by optimizing process variables of each reactor of a reaction unit in which a plurality of reactors are connected in series.

The present disclosure relates to a catalyst system to produce crystallizable polyester compositions which comprise residues of terephthalic acid, neopentyl glycol (NRG), 1,4-cyclohexanedimethanol (CHDM), ethylene glycol (EG), and diethylene glycol (DEG), in certain compositional ranges having certain advantages and improved properties including recyclability. The present disclosure also relates to a catalyst system to produce crystallizable polyester compositions which comprise residues of recycled terephthalic acid, recycled neopentyl glycol (NRG), recycled 1,4-cyclohexanedimethanol (CHDM), recycled ethylene glycol (EG), and/or recycled diethylene glycol (DEG), in certain compositional ranges having certain advantages and improved properties including recyclability.

The present disclosure relates to a catalyst system to produce crystallizable polyester compositions which comprise residues of terephthalic acid, neopentyl glycol (NRG), 1,4-cyclohexanedimethanol (CHDM), ethylene glycol (EG), and diethylene glycol (DEG), in certain compositional ranges having certain advantages and improved properties including recyclability. The present disclosure also relates to a catalyst system to produce crystallizable polyester compositions which comprise residues of recycled terephthalic acid, recycled neopentyl glycol (NRG), recycled 1,4-cyclohexanedimethanol (CHDM), recycled ethylene glycol (EG), and/or recycled diethylene glycol (DEG), in certain compositional ranges having certain advantages and improved properties including recyclability.

Provided is a thermoplastic polyether ester elastomer composition having a first chain represented by the following Formula (I) and a second chain represented by the following Formula (II), which are connected to each other:

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Wherein, the melting point of the thermoplastic polyether ester elastomer composition ranges from 80° C. to 160° C., and the enthalpy of fusion of the thermoplastic polyether ester elastomer composition is greater than 6 J/g. Production of the thermoplastic polyether ester elastomer composition has low energy consumption and facilitates smooth cutting strands into pellets, which is beneficial to mass production of the thermoplastic polyether ester elastomer composition.

The invention provides methods for the formation of thermo-reversible hydrogels from triblock copolymers of poly(ethylene glycol) and poly(α-benzyl carboxylate-ε-caprolactone) (PBCL-PEG-PBCL) prepared by bulk and solution polymerization. PBCL-PEG-PBCLs prepared at fixed PBCL to PEG ratios but different polymerization times were characterized for their average molecular weights, molar-mass disparity and intrinsic viscosity using .sup.1H NMR and gel permeation chromatography (GPC). The results indicated a copolymer of high molecular weight population with elevated intrinsic viscosity. The size and proportion of this population grew as a function of polymerization time. The formation of this high molecular weight PBCL-PEG-PBCL population can be attributed to non-linear architecture caused by partial cross-linking of the PBCL segment during the polymerization reaction. At least about 40% mole concentration of the high molecular weight PBCL-PEG-PBCL was required for thermo-reversible micellar aggregation in aqueous media and hydrogel formation.

The invention provides methods for the formation of thermo-reversible hydrogels from triblock copolymers of poly(ethylene glycol) and poly(α-benzyl carboxylate-ε-caprolactone) (PBCL-PEG-PBCL) prepared by bulk and solution polymerization. PBCL-PEG-PBCLs prepared at fixed PBCL to PEG ratios but different polymerization times were characterized for their average molecular weights, molar-mass disparity and intrinsic viscosity using .sup.1H NMR and gel permeation chromatography (GPC). The results indicated a copolymer of high molecular weight population with elevated intrinsic viscosity. The size and proportion of this population grew as a function of polymerization time. The formation of this high molecular weight PBCL-PEG-PBCL population can be attributed to non-linear architecture caused by partial cross-linking of the PBCL segment during the polymerization reaction. At least about 40% mole concentration of the high molecular weight PBCL-PEG-PBCL was required for thermo-reversible micellar aggregation in aqueous media and hydrogel formation.

A process for preparing a recycle content polyester and a recycle content polyester composition comprising at least one polyester having at least one residue in the polyester derived from a recycle propylene composition are provided.