US 11,708,512 B2
Adhesive composition for foldable display, adhesive film using same, and foldable display comprising same
Hee Song, Daejeon (KR); Hyon Gyu Park, Daejeon (KR); and Hyun Cheol Kim, Daejeon (KR)
Assigned to LG CHEM, LTD., Seoul (KR)
Appl. No. 16/765,745
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Feb. 1, 2019, PCT No. PCT/KR2019/001435
§ 371(c)(1), (2) Date May 20, 2020,
PCT Pub. No. WO2019/151824, PCT Pub. Date Aug. 8, 2019.
Claims priority of application No. 10-2018-0013388 (KR), filed on Feb. 2, 2018.
Prior Publication US 2020/0291276 A1, Sep. 17, 2020
Int. Cl. C09J 133/08 (2006.01); B32B 7/12 (2006.01); C09J 201/02 (2006.01); C09J 7/00 (2018.01); C09J 7/10 (2018.01); G02F 1/1333 (2006.01)
CPC C09J 133/08 (2013.01) [B32B 7/12 (2013.01); C09J 7/00 (2013.01); C09J 7/10 (2018.01); C09J 201/02 (2013.01); B32B 2457/20 (2013.01); B32B 2457/208 (2013.01); C09J 2203/318 (2013.01); C09J 2301/312 (2020.08); C09J 2433/00 (2013.01); C09K 2323/05 (2020.08); C09K 2323/057 (2020.08); G02F 1/133305 (2013.01); G02F 2202/28 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An adhesive composition for a foldable display comprising:
a thermocurable resin; and
a cros slinking agent,
wherein the thermocurable resin consists of a unit derived from a compound including at least one N or O and at least one unshared electron pair in the compound, and
a unit derived from a compound including an acrylate group,
the thermocurable resin has a glass transition temperature of lower than −70° C., and
the compound including at least one N or 0 and at least one unshared electron pair in the compound is represented by the following Chemical Formula 1:

OG Complex Work Unit Chemistry
in the Chemical Formula 1,
R1 is an alkyleneoxy group;
R2 is hydrogen; an alkyl group; or a nitrile group;
R3 is an alkoxy group; and
m is an integer of 1 to 4,
wherein, with respect to 100 parts by weight of the thermocurable resin, the unit derived from the compound including at least one N or O and at least one unshared electron pair in the compound is included in 28 parts by weight to 48 parts by weight,
and
the unit derived from the compound including an acrylate group is included in 52 parts by weight to 72 parts by weight; and
wherein the composition after curing has a storage modulus of 1.4×104 Pa to 3.9×105 Pa at −30° C. and 60° C. and a relative dielectric constant of 4 or greater at 25° C., 60 RH % and 100 KHz.