	US 12,030,982 B2
	Polyester resin having improved adhesion strength for binder and polyester fiber using same
Hyun Wook Shin, Daejeon (KR); Min Sung Lee, Daejeon (KR); Sung Yeol Kim, Daejeon (KR); and Seong Yoon Park, Daejeon (KR)
Assigned to HUVIS CORPORATION, Seoul (KR)
Appl. No. 17/297,900
Filed by HUVIS CORPORATION, Seoul (KR)
PCT Filed Nov. 7, 2019, PCT No. PCT/KR2019/015041 § 371(c)(1), (2) Date May 27, 2021, PCT Pub. No. WO2020/111563, PCT Pub. Date Jun. 4, 2020.
Claims priority of application No. 10-2018-0152307 (KR), filed on Nov. 30, 2018; and application No. 10-2018-0167699 (KR), filed on Dec. 21, 2018.
Prior Publication US 2022/0041801 A1, Feb. 10, 2022
Int. Cl. C08G 63/183 (2006.01); D01F 8/14 (2006.01); D04H 1/435 (2012.01); D04H 1/4382 (2012.01)

CPC C08G 63/183 (2013.01) [D01F 8/14 (2013.01); D04H 1/435 (2013.01); D04H 1/43828 (2020.05)]

3 Claims

1. A polyester fiber, comprising:

a sheath part; and

a core part, wherein the core part is formed of a polyethylene terephthalate (PET) resin;

wherein the sheath part is formed of polyester resin for a binder, the polyester resin including an acid component comprised of terephthalic acid or an ester-forming derivative thereof and diol components comprised of 2-methyl-1,3-propanediol, 2-methyl-1,3-pentanediol, and ethylene glycol, wherein the 2-methyl-1,3-pentanediol of the polyester resin for the binder is contained in an amount of 0.05 to 2 mol % of a total mole of diols in the diol components, wherein the PET resin of the core part has a melt viscosity at 280° C. of 2,000 to 2,500 poises, and the polyester resin for the binder of the sheath part has a melt viscosity at 260° C. of 600 to 1,500 poises.