Patent ID: 11939425
Assignee: SK CHEMICALS CO., LTD.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A manufacturing method for a polyester resin, comprising:
(a) in the presence of a catalyst, performing an esterification reaction on (i) a dicarboxylic acid that includes a terephthalic acid and (ii) a diol including 0.5 to 25 mol % of isosorbide with respect to a total diol; and
(b) performing a polycondensation reaction on a product obtained by the esterification reaction,
wherein an initial mixing molar ratio of the dicarboxylic acid and the diol is between 1:1.02 and 1:1.04,
wherein the catalyst comprises at least one oxide of an element selected from the group consisting of magnesium, lead, zinc, antimony, and germanium, and
wherein a color b value of an injection-molded sample of the polyester resin, obtained by injection molding the polyester resin at 290° C., ranges between about −1.0 and 0.5.