Polycondensation catalyst for producing polyester and production of polyester using the same
AssigneeSakai Chemical Industry Co., Ltd.
InventorsYuhei Soga, Akihiro Kamon
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Abstract
The invention provides a polycondensation catalyst for producing polyester by an esterification reaction or a transesterification reaction of a dicarboxylic acid or an ester-forming derivative thereof and a glycol, wherein the polycondensation catalyst comprises particles of a water-insoluble or hardly water-soluble phosphate having on the surfaces a coating layer of titanic acid in an amount, of 0.1 to 100 parts by weight in terms of TiO2 per 100 parts by weight of the phosphate.
Claims10
A polycondensation catalyst for producing polyester by an esterification reaction or a transesterification reaction of a dicarboxylic acid or a dialkyl ester thereof and a glycol,
- wherein the polycondensation catalyst comprises particles of a water-insoluble or hardly water-soluble phosphate having on a surface thereof a coating layer of titanic acid in an amount of 0.1 to 100 parts by weight in terms of TiO2 per 100 parts by weight of the phosphate, and
- wherein a maximum amount of the phosphate that is soluble in 100 g of water at a temperature of 25° C. is 2.00 g or less.
Dependencies are inferred from the claim text.