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AssigneeTeijin Frontier Co., Ltd.
InventorsRyo TSURUDA, Satoshi SUNOUCHI
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Provided are a method for producing an aromatic bis(hydroxyalkyl) dicarboxylate, comprising subjecting a polyester to depolymerization in the presence of a catalyst, in which the catalyst is a manganese catalyst, and in which the amount of the catalyst used is 20 to 500 mmol %, based on the mole of the polyester, a method for producing an aromatic bis(hydroxyalkyl) dicarboxylate by subjecting a polyester to depolymerization by the method, and a method for producing a polyester polymer by subjecting the aromatic bis(hydroxyalkyl) dicarboxylate as a raw material to repolymerization, in which these methods are a method for producing a polyester polymer having as small the degree of discoloration as that of a virgin polymer (which is produced by polymerizing a monomer, and which has not experienced depolymerization) of polyester and a method for producing an intermediate of the polyester polymer.
A method for producing an aromatic bis(hydroxyalkyl) dicarboxylate, comprising subjecting a polyester to depolymerization in the presence of a catalyst, wherein the catalyst is a manganese catalyst, and wherein the amount of the catalyst used is 20 to 500 mmol %, based on the mole of the polyester.
A method for producing a recycled aromatic polyester, comprising subjecting a polyester containing an aromatic polyester to depolymerization, and then subjecting the component obtained by depolymerization to polycondensation, obtaining a recycled aromatic polyester,
A method for producing a recycled aromatic polyester, comprising subjecting a polyester containing an aromatic polyester to depolymerization, and then subjecting the component obtained by depolymerization to polycondensation, obtaining a recycled aromatic polyester, wherein the polyester containing an aromatic polyester is subjected to depolymerization in an alkylene glycol to obtain an aromatic bis(hydroxyalkyl) dicarboxylate, and the aromatic bis(hydroxyalkyl) dicarboxylate is purified, and the purified aromatic bis(hydroxyalkyl) dicarboxylate is subjected to polycondensation in the presence of an alkali metal and/or an alkaline earth metal, obtaining a recycled aromatic polyester.
Dependencies are inferred from the claim text.