US 12,282,140 B2
Flexible window film and display apparatus comprising same
Yong Woon Kim, Suwon-si (KR); Nak Hyun Sung, Suwon-si (KR); and Min Hye Kim, Suwon-si (KR)
Assigned to Samsung SDI Co., Ltd., Yongin-si (KR)
Appl. No. 17/754,639
Filed by Samsung SDI Co., Ltd., Yongin-si (KR)
PCT Filed Sep. 25, 2020, PCT No. PCT/KR2020/013147
§ 371(c)(1), (2) Date Apr. 7, 2022,
PCT Pub. No. WO2021/071152, PCT Pub. Date Apr. 15, 2021.
Claims priority of application No. 10-2019-0124036 (KR), filed on Oct. 7, 2019.
Prior Publication US 2022/0390649 A1, Dec. 8, 2022
Int. Cl. C09D 5/18 (2006.01); B32B 7/02 (2019.01); B32B 7/12 (2006.01); B32B 15/02 (2006.01); B32B 15/04 (2006.01); B32B 15/088 (2006.01); B32B 27/34 (2006.01); C08J 5/18 (2006.01); C08J 7/04 (2020.01); C08J 7/044 (2020.01); C09D 5/00 (2006.01); C09D 5/24 (2006.01); C09D 7/20 (2018.01); C09D 7/40 (2018.01); C09D 133/10 (2006.01); C09D 179/08 (2006.01); G02B 1/14 (2015.01); G02B 1/16 (2015.01); G02B 7/20 (2021.01)
CPC G02B 1/14 (2015.01) [B32B 7/02 (2013.01); B32B 15/02 (2013.01); B32B 15/043 (2013.01); B32B 15/088 (2013.01); B32B 27/34 (2013.01); C08J 5/18 (2013.01); C08J 7/042 (2013.01); C08J 7/0427 (2020.01); C08J 7/044 (2020.01); C09D 5/002 (2013.01); C09D 5/24 (2013.01); C09D 7/20 (2018.01); C09D 7/70 (2018.01); C09D 133/10 (2013.01); C09D 179/08 (2013.01); G02B 1/16 (2015.01); B32B 7/12 (2013.01); B32B 2255/06 (2013.01); B32B 2255/10 (2013.01); B32B 2255/26 (2013.01); B32B 2307/412 (2013.01); B32B 2307/418 (2013.01); B32B 2307/536 (2013.01); B32B 2307/546 (2013.01); B32B 2457/20 (2013.01); C08J 2379/08 (2013.01); C08J 2433/10 (2013.01); C08J 2479/08 (2013.01)] 18 Claims
 
1. A window film comprising:
a base layer, a buffer layer and a hard coating layer sequentially stacked one above another in the stated order,
wherein the buffer layer comprises, in a thickness direction thereof, a first region in which a content of an amide group gradually increases from an interface between the hard coating layer and the buffer layer, and a second region in which the content of the amide group gradually decreases from an interface between the base layer and the buffer layer,
wherein the buffer layer comprises a poly (amide-imide) block copolymer, and
wherein the base layer comprises a material different from the poly (amide-imide) block copolymer in the buffer layer.