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1. A method for preparing a polyester resin comprising the steps of:
carrying out an esterification reaction and/or an ester exchange reaction of a diacid component and a diol component in a presence of phosphoric acid derivatives selected from a group consisting of compounds represented by the following Formulas 1 to 3; and carrying out a polycondensation reaction for reaction product of the esterification and/or ester exchange reaction,in Formula 1, R1 is a linear, branched, mono-cyclic or multi-cyclic saturated or unsaturated hydrocarbon group of 0 to 10 carbon atoms, in Formula 2, R2 is a hydrogen atom or a linear saturated or unsaturated hydrocarbon group of 1 to 10 carbon atoms, R3 and R4 are independently a linear, branched, mono-cyclic or multi-cyclic saturated or unsaturated hydrocarbon group of 1 to 10 carbon atoms, in Formula 3, R5 is a linear, branched, mono-cyclic or multi-cyclic saturated or unsaturated hydrocarbon group of 1 to 10 carbon atoms, and R6 is a saturated or unsaturated hydrocarbon group of 1 to 10 carbon atoms,
wherein the diol component comprises a primary diol and isosorbide, the input of the primary diol is 1 to 200 parts by mole, the input of isosorbide is 10 to 70 parts by mole with respect to 100 parts by mole of the diacid component, and wherein a reaction time of the esterification reaction or the ester exchange reaction is reduced and the remaining rate of isosorbide in the main chain of the polyester resin is increased to be from 48 mole percent to 70 mole percent in comparison to polymer prepared without the phosphoric acid derivatives, and wherein the input of the phosphoric acid derivatives is 0.01 to 2 parts by weight with respect to 100 parts by weight of the diacid component. |
