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Abstract

A polylactic polyester resin having a chemical structure represented by Formula (1), an acid value of 300 to 2,500 eq/10⁶ g, a number average molecular weight of 2,000 to 50,000, and a lactic acid content percentage of not less than 40 weight %,

description='In-line Formulae' end='lead'Z—(O—(CH₂CH₂O)_p—(CO—Y—O)_q—X)_r  (1)description='In-line Formulae' end='tail'

wherein Z is an r-valent organic group, Y is —CH(CH3)—, or a mixture of —CH(CH3)— and C2-10 linear or branched alkylene group, and X is a residue of a polybasic acid having 2 or more carboxyl groups, or hydrogen; each of X, Y, and Z may be one kind or a mixture of a plurality of different kinds; and p, q, and r are 0 or a positive integer, p has an average value of not less than 0.5, q has an average value of not less than 5, and r has an average value of not less than 3 and not more than 15.

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First Claim