US 12,146,083 B2
Surface protection film, and method for manufacturing organic light-emitting electronic device
Jeong Min Choi, Daejeon (KR); Hyun Cheol Kim, Daejeon (KR); Sojin Kim, Daejeon (KR); Hyungoo Kang, Daejeon (KR); and Jae Seung Lim, Daejeon (KR)
Assigned to LG Chem, Ltd., Seoul (KR)
Appl. No. 17/294,849
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Jan. 22, 2020, PCT No. PCT/KR2020/001109
§ 371(c)(1), (2) Date May 18, 2021,
PCT Pub. No. WO2020/153756, PCT Pub. Date Jul. 30, 2020.
Claims priority of application No. 10-2019-0010021 (KR), filed on Jan. 25, 2019.
Prior Publication US 2022/0017787 A1, Jan. 20, 2022
Int. Cl. C09J 7/30 (2018.01); C09J 9/00 (2006.01); C09J 133/08 (2006.01); C09J 175/04 (2006.01); H10K 50/844 (2023.01); H10K 71/00 (2023.01); H10K 85/10 (2023.01)
CPC C09J 7/30 (2018.01) [C09J 9/00 (2013.01); C09J 133/08 (2013.01); C09J 175/04 (2013.01); H10K 50/844 (2023.02); H10K 71/00 (2023.02); H10K 85/141 (2023.02); C09J 2203/326 (2013.01); C09J 2301/312 (2020.08); C09J 2433/00 (2013.01); C09J 2475/00 (2013.01)] 13 Claims
 
1. A surface protective film comprising:
a base layer; and
an adhesive layer provided on one surface of the base layer,
wherein the adhesive layer comprises a cured product of an adhesive composition, comprising: a urethane polymer; an acrylic polymer; and a curing agent,
wherein the acrylic polymer comprises a monomer unit derived from an alkyl(meth)acrylate monomer having 10 or more carbon atoms, and
wherein an adhesive strength maintenance ratio of the adhesive layer, calculated by Equation 1, is 50% or more:
Adhesive strength maintenance ratio=(a high temperature peel strength)/(a low temperature peel strength)×100,  Equation 1
wherein the low temperature peel strength is a peel strength when the adhesive layer of the surface protective film is attached to glass and stored at 25° C. for 24 hours, and then the surface protective film is peeled off from the glass at a peel speed of 1.8 m/min, a peel angle of 180°, and a temperature of 25° C., and
wherein the high temperature peel strength is a peel strength when the adhesive layer of the surface protective film is attached to glass, stored at 25° C. for 24 hours, and then left to stand at 40° C. for 1 minute, and the surface protective film is peeled off from the glass at a peel speed of 1.8 m/min, a peel angle of 180°, and a temperature of 40° C.