	US 11,939,425 B2
	Polyester resin
Yoo Jin Lee, Gyeonggi-do (KR); Su-Min Lee, Seoul (KR); Sung-Gi Kim, Gyeonggi-do (KR); Min-Young Han, Gyeonggi-do (KR); and Dong-jin Han, Gyeonggi-do (KR)
Assigned to SK Chemicals Co., Ltd., Gyeonggi-do (KR)
Filed by SK CHEMICALS CO., LTD., Gyeonggi-do (KR)
Filed on Sep. 23, 2020, as Appl. No. 17/029,822.
Application 17/029,822 is a division of application No. 16/078,207, abandoned, previously published as PCT/KR2017/003438, filed on Mar. 29, 2017.
Claims priority of application No. 10-2016-0042407 (KR), filed on Apr. 6, 2016.
Prior Publication US 2021/0017331 A1, Jan. 21, 2021
Int. Cl. C08G 63/672 (2006.01); C08G 63/183 (2006.01); C08G 63/78 (2006.01); C08G 63/80 (2006.01)

CPC C08G 63/672 (2013.01) [C08G 63/183 (2013.01); C08G 63/78 (2013.01); C08G 63/80 (2013.01); C08G 2390/00 (2013.01)]

7 Claims

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.