A catalytic composition for preparing a polyethylene terephthalate (PET) resin is provided. The catalytic composition comprises a polycondensation catalyst and cesium tungsten oxide (Cs.sub.xWO.sub.3-yCl.sub.y), and 0<x≦1 and 0≦y≦0.5. A PET resin prepared by the catalytic composition above is also provided. The PET resin comprises 2-80 ppm of cesium tungsten oxide. This catalytic composition can solve the problems of slow solid-state polymerization rate of the PET preparation and thus the long preparation time, as well as yellowing. Moreover, the PET resin can absorb infrared radiation.

A catalytic composition for preparing a polyethylene terephthalate (PET) resin is provided. The catalytic composition comprises a polycondensation catalyst and cesium tungsten oxide (Cs.sub.xWO.sub.3-yCl.sub.y), and 0<x≦1 and 0≦y≦0.5. A PET resin prepared by the catalytic composition above is also provided. The PET resin comprises 2-80 ppm of cesium tungsten oxide. This catalytic composition can solve the problems of slow solid-state polymerization rate of the PET preparation and thus the long preparation time, as well as yellowing. Moreover, the PET resin can absorb infrared radiation.

A method for manufacturing a polyester containing at least one 1,4:3,6-dianhydrohexitol unit, including a step of introducing, into a reactor, monomers comprising at least one monomer (A) which is a diacid or a diester and at least one monomer (B) which is a 1,4:3,6-dianhydrohexitol, a step of introducing, into the reactor, a catalytic system comprising either a catalyst comprising the element germanium and a catalyst comprising the element tin, or a catalyst comprising the elements germanium and tin or a mixture of said catalysts, a step of polymerizing the monomers to form the polyester, a step of recovering a polyester composition comprising the polyester and the catalytic system. The invention also relates to a polyester composition containing a catalytic system and the use of same to reduce the colouring of the polyester.

The present application relates to a Michael Addition curable composition, coating composition containing the same and coated article made therefrom. In particular, the Michael Addition curable composition comprises at least one reactive donor capable of providing two or more nucleophilic carbanions; at least one reactive acceptor comprising two or more carbon-carbon double bonds; and at least one catalyst for catalyzing a Michael Addition crosslinking reaction between the at least one reactive donor and the at least one reactive acceptor, wherein the at least one reactive donor comprises at least one branched polyester comprising at least one polyester backbone and at least one —C(O)—CH.sub.2—C(O)-moiety; wherein the at least one polyester backbone is derived from an alcohol component comprising at least one alcohol having at least three hydroxyl groups; and wherein the at least one branched polyester has a —C(O)—CH.sub.2—C(O)-moiety equivalent of no more than 700 g/mol.

The present application relates to a Michael Addition curable composition, coating composition containing the same and coated article made therefrom. In particular, the Michael Addition curable composition comprises at least one reactive donor capable of providing two or more nucleophilic carbanions; at least one reactive acceptor comprising two or more carbon-carbon double bonds; and at least one catalyst for catalyzing a Michael Addition crosslinking reaction between the at least one reactive donor and the at least one reactive acceptor, wherein the at least one reactive donor comprises at least one branched polyester comprising at least one polyester backbone and at least one —C(O)—CH.sub.2—C(O)-moiety; wherein the at least one polyester backbone is derived from an alcohol component comprising at least one alcohol having at least three hydroxyl groups; and wherein the at least one branched polyester has a —C(O)—CH.sub.2—C(O)-moiety equivalent of no more than 700 g/mol.

The present disclosure relates to a polyester resin composition including a polyester resin including a diol residue and a dicarboxylic acid residue, wherein the diol residue includes a cyclohexanedimethanol residue and the dicarboxylic acid residue includes an isophthalic acid residue and a terephthalic acid residue, wherein an amount of the isophthalic acid residue is 0 to 20 mol % when a total amount of the dicarboxylic acid residue is considered as 100 mol %, wherein an amount of the cyclohexanedimethanol residue is 50 to 100 mol % when a total amount of the diol residue is considered as 100 mol %, wherein the polyester resin composition includes an antioxidant, and wherein the antioxidant includes a phenol-based antioxidant, a phosphorus-based antioxidant, and a sulfur-based antioxidant.

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.

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.

The present invention relates to a process for polymerizing lactide comprising the steps of a) preparing a liquid catalyst formulation comprising a catalyst, an initiator and lactide, and b) contacting the liquid catalyst formulation prepared in step a) with lactide, and polymerizing said lactide in the presence of said liquid catalyst formulation to form polylactide. The invention further provides a liquid catalyst formulation and use thereof for polymerizing lactide.

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.