US 12,071,525 B2
Polyester film and preparation method thereof
Da-Young Hwang, Gyeonggi-do (KR); and Yoo Jin Lee, Gyeonggi-do (KR)
Assigned to SK Chemicals Co., Ltd., Gyeonggi-do (KR)
Appl. No. 17/422,699
Filed by SK CHEMICALS CO., LTD., Gyeonggi-do (KR)
PCT Filed Jul. 5, 2019, PCT No. PCT/KR2019/008312
§ 371(c)(1), (2) Date Jul. 13, 2021,
PCT Pub. No. WO2020/149469, PCT Pub. Date Jul. 23, 2020.
Claims priority of application No. 10-2019-0006446 (KR), filed on Jan. 17, 2019; and application No. 10-2019-0080466 (KR), filed on Jul. 4, 2019.
Prior Publication US 2022/0119602 A1, Apr. 21, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C08J 5/18 (2006.01); B29C 48/00 (2019.01); B29C 48/08 (2019.01); B29C 55/00 (2006.01); B29C 55/14 (2006.01); B29C 71/02 (2006.01); C08G 63/183 (2006.01); C08G 63/80 (2006.01); C08L 67/02 (2006.01); B29K 67/00 (2006.01); B29L 7/00 (2006.01)
CPC C08J 5/18 (2013.01) [B29C 48/0018 (2019.02); B29C 48/022 (2019.02); B29C 48/08 (2019.02); B29C 55/005 (2013.01); B29C 55/14 (2013.01); B29C 71/02 (2013.01); C08G 63/183 (2013.01); C08G 63/80 (2013.01); C08L 67/02 (2013.01); B29K 2067/003 (2013.01); B29L 2007/008 (2013.01); C08J 2367/02 (2013.01); C08J 2467/02 (2013.01); C08L 2205/02 (2013.01)] 14 Claims
 
1. A polyester film, comprising
a resin layer formed from a mixture comprising polyethylene terephthalate and a polyester resin in a weight ratio of 90:10 to 10:90,
wherein the polyethylene terephthalate is different from the polyester resin, and the polyester resin has a structure in which an acid moiety derived from a dicarboxylic acid or a derivative thereof and a diol moiety derived from a diol are repeated, and is characterized in that a content of a first diol moiety (a) derived from isosorbide and a content of a second diol moiety (b) derived from cyclohexanedimethanol with respect to 100 mol % of a total diol moiety derived from the diol satisfy the following Equation 1:

OG Complex Work Unit Math
in the above Equation, a is a content (mol %) of a first diol moiety derived from isosorbide and is 4 to 18 mol % with respect to 100 mol % of a total diol moiety derived from the diol in the polyester resin, and b is a content (mol %) of a second diol moiety derived from cyclohexanedimethanol.