公开(公告)号：US11993706B2

公开(公告)日：2024-05-28

申请号：US17422683

申请日：2019-07-10

Applicant: SK CHEMICALS CO., LTD.

Inventor： Yoo Jin Lee ,  Da-Young Hwang

IPC: C08L67/02 ,  B29C48/00 ,  B29C48/08 ,  B29C48/21 ,  B29C55/14 ,  B32B27/08 ,  B32B27/36 ,  C08J5/18 ,  B29K67/00 ,  B29K105/00

CPC classification number: C08L67/02 ,  B29C48/0018 ,  B29C48/08 ,  B29C48/21 ,  B29C55/143 ,  B32B27/08 ,  B32B27/36 ,  C08J5/18 ,  B29K2067/003 ,  B29K2105/0094 ,  B29K2995/0012 ,  B29K2995/0053 ,  B32B2250/244 ,  B32B2307/30 ,  B32B2307/518 ,  B32B2307/732 ,  C08J2367/02 ,  C08J2467/02 ,  C08L2203/16 ,  C08L2203/30 ,  C08L2205/025

Abstract: The present disclosure relates to a polyester film and a preparation method of the same. Since the polyester film includes a resin layer formed from a polyester resin including a first diol moiety derived from isosorbide and a second diol moiety derived from cyclohexanedimethanol in a controlled ratio on at least one surface of a base layer, it is possible to exhibit excellent heat resistance and adhesion.

公开(公告)号：US12168723B2

公开(公告)日：2024-12-17

申请号：US18233566

申请日：2023-08-14

Applicant: SK CHEMICALS CO., LTD.

Inventor： Da-Young Hwang ,  Sangwoo Kim ,  Jiyeon Eom ,  Boo-Youn Lee

IPC: C08J5/18 ,  B29C48/00 ,  B29C48/305 ,  B29C55/04 ,  B29K67/00 ,  C08G63/183 ,  C08G63/199 ,  C08G63/86

Abstract: A stretched polyester film and a method for preparing the stretched polyester film are disclosed. The stretched polyester film contains a polyester resin in which a diol component and a dicarboxylic acid component are polymerized, wherein the heat shrinkage rate of the film at 80° C. in the main shrinkage direction is 40% or more, and, upon a first thermal treatment and a second thermal treatment, a first melting temperature (Tm1) and a second melting temperature (Tm2) appear when the film is analyzed by differential scanning calorimetry (DSC). The stretched polyester film has excellent heat shrinkability, along with an increased efficiency of a recycling process of waste plastic containers.

公开(公告)号：US12071525B2

公开(公告)日：2024-08-27

申请号：US17422699

申请日：2019-07-05

Applicant: SK CHEMICALS CO., LTD.

Inventor： Da-Young Hwang ,  Yoo Jin Lee

IPC: C08J5/18 ,  B29C48/00 ,  B29C48/08 ,  B29C55/00 ,  B29C55/14 ,  B29C71/02 ,  C08G63/183 ,  C08G63/80 ,  C08L67/02 ,  B29K67/00 ,  B29L7/00

CPC classification number: C08J5/18 ,  B29C48/0018 ,  B29C48/022 ,  B29C48/08 ,  B29C55/005 ,  B29C55/14 ,  B29C71/02 ,  C08G63/183 ,  C08G63/80 ,  C08L67/02 ,  B29K2067/003 ,  B29L2007/008 ,  C08J2367/02 ,  C08J2467/02 ,  C08L2205/02

Abstract: The present disclosure relates to a polyester film and a preparation method of the same. Since the polyester film includes a resin layer formed from a mixture comprising a polyester resin, which includes a first diol moiety derived from isosorbide and a second diol moiety derived from cyclohexanedimethanol in a controlled ratio, and polyethylene terephthalate in a specific ratio, it is possible to exhibit improved heat resistance and adhesion with excellent light transmittance.

公开(公告)号：US12077634B2

公开(公告)日：2024-09-03

申请号：US18248812

申请日：2021-09-14

Applicant: SK CHEMICALS CO., LTD.

Inventor： Da-Young Hwang ,  Kwang-Woo Park ,  Yoo Jin Lee ,  Jong-In Lee

IPC: C08G63/78 ,  C07C67/56 ,  C08G63/672

CPC classification number: C08G63/672 ,  C07C67/56 ,  C08G63/78

Abstract: The present disclosure relates to a method for purifying bis-2-hydroxyethyl terephthalate with high purity and a polyester resin containing the same.

公开(公告)号：US12018118B2

公开(公告)日：2024-06-25

申请号：US18569279

申请日：2023-04-18

Applicant: SK CHEMICALS CO., LTD.

Inventor： Da-Young Hwang ,  Sangwoo Kim ,  Ha-Neul Kim ,  Boo-Youn Lee

IPC: C08G63/06 ,  B29C48/00 ,  B29C48/08 ,  B29K67/00 ,  C08G63/183 ,  C08G63/199 ,  C08G63/664 ,  C08G63/85 ,  C08L67/03

CPC classification number: C08G63/065 ,  B29C48/022 ,  B29C48/08 ,  C08G63/183 ,  C08G63/199 ,  C08G63/664 ,  C08G63/85 ,  C08L67/03 ,  B29K2067/04 ,  C08L2201/08 ,  C08L2207/20

Abstract: A polyester resin comprising regenerated BHET according to an embodiment has excellent heat resistance characteristics since a diethylene glycol generated from the regenerated BHET to remain in the polyester resin is adjusted to a predetermined level or less, so that the polyester resin can be manufactured into a heat-shrinkable film.