| abstract |
The present invention provides a polyester resin which comprises (a-1) 45 to 99% by mole of an oxycarboxylic acid unit having 5 carbon atoms or less, (a-2) 0.5 to 27.5% by mole of an aromatic dicarboxylic acid unit, and (a-3) 0.5 to 27.5% by mole of an aliphatic diol unit having 4 carbon atoms or less, and containing (a-1) to (a-3) in a total amount of 95% by mole or greater, n wherein the relationship between the content of the oxycarboxylic acid, expressed as M % by mole, and the density ρ (kg/m 3 ) of the polyester resin, satisfies the formula ρ≧1349+M×0.85. |