Method for producing aqueous polyester resin, aqueous polyester resin, and aqueous coating composition

The method for producing an aqueous polyester resin includes a first step and a second step. The first step includes inducing an ester formation reaction and a depolymerization reaction using the recycled polyester, a polycarboxylic acid component comprising polycarboxylic acid residues and not comp...

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Hauptverfasser: SAKAKIBARA TERU, KOMABIKI SHINYA
Format: Patent
Sprache:chi ; eng
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Zusammenfassung:The method for producing an aqueous polyester resin includes a first step and a second step. The first step includes inducing an ester formation reaction and a depolymerization reaction using the recycled polyester, a polycarboxylic acid component comprising polycarboxylic acid residues and not comprising terephthalic acid, and a polyol component. The second step includes causing a polycondensation reaction by reducing the pressure. The first step includes: using the recycled polyester in an amount such that the proportion of terephthalic acid residues is equal to or greater than 20 mass% and equal to or less than 72 mass%; and using a metal sulfonate group-containing polycarboxylic acid compound in an amount such that the proportion of metal sulfonate group-containing polycarboxylic acid residues is equal to or greater than 5 mass% and equal to or less than 32 mass%. The resin thus produced has an acid number equal to or less than 10 mgKOH/g. 用于生产水系聚酯树脂的方法包括第一步骤和第二步骤。第一步骤包括使用再生聚酯、包含多元羧酸残基并且不包含对苯二甲酸的多元羧酸组分、以及