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1. A polyester resin that is a polycondensate obtained by reacting a divalent alcohol, a divalent carboxylic acid, and a mono- or divalent rosin with a zinc compound as a reaction catalyst, the zinc compound having a salt structure resulting from a reaction between an acid and zinc, wherein:
the divalent alcohol is selected from the group consisting of ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1-4-butanediol, 2,3-butanediol, 1-4-butenediol, 2-methyl-1,3-propanediol, 1,5-pentanediol, neopentyl glycol, 2-ethyl-2-methylpropane-1,3-diol, 2-butyl-2-ethylpropane-1,3-diol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, 2-ethyl-1,3-hexanediol, 2,4-dimethyl-1,5-pentanediol, 2,2,4-trimethyl-1,3-pentanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, 1,11-undecanediol, 1,12-dodecanediol, 1,13-tridecanediol, 1,14-tetradecanediol, 1,18-octadecanediol, 1,14-eicosanedecanediol, 3-hydroxy-2,2-dimethylpropyl-3-hydroxy-2,2-dimethylpropanoate, diethylene glycol, triethylene glycol, polyethylene glycol, dipropylene glycol, polypropylene glycol, a bisphenol A-ethylene oxide adduct, a bisphenol A-propylene oxide adduct, and a bisphenol A-butylene oxide adduct; the divalent carboxylic acid is selected from the group consisting of phthalic acid, isophthalic acid, terephthalic acid, 1,4-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, oxalic acid, malonic acid, maleic acid, fumaric acid, citraconic acid, itaconic acid, glutaconic acid, succinic acid, adipic acid, sebacic acid, azelaic acid, an alkylsuccinic acid having an alkyl group with a carbon number of from 1 to 20 and having a branched chain, an alkenylsuccinic acid having an alkenyl group with a carbon number of from 1 to 20 and having a branched chain, anhydrides of the acids, and alkyl esters having a carbon number of from 1 to 3 of the acids; an amount of the zinc compound reaction catalyst is from 0.5 parts by weight to 1.5 parts by weight with respect to 100 parts by weight of a total amount of the divalent alcohol, the divalent carboxylic acid, and the mono- or divalent rosin; when the monovalent rosin is reacted to form the polyester resin, the monovalent rosin is contained in the polyester resin in an amount of from 5% by weight to 20% by weight with respect to an entire carboxylic acid component; and when the divalent rosin is reacted to form the polyester resin, the divalent rosin is contained in the polyester resin in an amount of from 5% by weight to 70% by weight with respect to the entire carboxylic acid component. |
