Polyester resin and method for producing polyester resin

Abstract

The polyester resin is a polyvalent carboxylic acid component and a polyhydric alcohol component as constituent components. The polyester resin satisfies (1) to (4): (1) it contains a polyvalent carboxylic acid having a furan backbone as the polyvalent carboxylic acid component, and contains ethylene glycol as the polyhydric alcohol component; (2) when measured through differential scanning calorimetry at a heating rate of 10° C./minute, a cold crystallization peak temperature of the polyester resin during first heating is within a range of 145 to 185° C. and a heat generation amount of the polyester resin during the first heating is 3 J/g or more; (3) a reduced viscosity of the polyester resin is 0.50 dl/g or more; and (4) the polyester resin contains at least one type of metal element selected from antimony, aluminum, titanium, and germanium, and a total content of the metal element is 350 ppm by mass or less.

Dependencies are inferred from the claim text.