US 12,461,296 B2
Optical laminate and image display device
Naoki Koito, Kanagawa (JP); Michio Arai, Kanagawa (JP); Shun Inoue, Kanagawa (JP); Hiroshi Matsuyama, Kanagawa (JP); and Yoshiaki Takada, Kanagawa (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on Mar. 16, 2023, as Appl. No. 18/185,052.
Application 18/185,052 is a continuation of application No. PCT/JP2021/034760, filed on Sep. 22, 2021.
Claims priority of application No. 2020-165078 (JP), filed on Sep. 30, 2020.
Prior Publication US 2023/0217789 A1, Jul. 6, 2023
Int. Cl. G02B 5/30 (2006.01); H10K 59/80 (2023.01)
CPC G02B 5/3016 (2013.01) [H10K 59/873 (2023.02); H10K 59/8791 (2023.02)] 20 Claims
OG exemplary drawing
 
1. An optical laminate comprising in the following order:
a pressure sensitive adhesive layer 1;
a specific laminate including a resin layer and a light absorption anisotropic layer which are adjacent to each other; and
a pressure sensitive adhesive layer 2,
wherein the light absorption anisotropic layer contains a dichroic substance,
the pressure sensitive adhesive layer 1 is adjacent to the resin layer included in the specific laminate, and
a storage elastic modulus Ep of the pressure sensitive adhesive layer 1 and a storage elastic modulus Ea and a moist heat strain δa of the resin layer satisfy Expression (1-1),
¼(3×Ep/Ea)2/3>δa  (1-1)
where both the storage elastic modulus Ep of the pressure sensitive adhesive layer 1 and the storage elastic modulus Ea of the resin layer are in units of GPa, and the moist heat strain δa of the resin layer denotes a value defined by Equation (2),
δa=Lmax/L0×100  (2)
Lmax: a maximum displacement amount (mm) in a case where a temperature profile in the following moist heat strain test is applied
L0: a distance between chucks (mm) in the following moist heat strain test
Moist heat strain test: a single resin layer film having a film thickness of 10 μm is used as a specimen, the specimen is held in an environment of 25° C. and a relative humidity of 50% for 30 minutes in a state where the distance between chucks is set to 15 mm and an extension load of 0.02 mN is applied thereto, the temperature and the humidity of the specimen are increased to 60° C. and a relative humidity of 90% over 80 minutes, the specimen is held in the environment of 60° C. and a relative humidity of 90% for 120 minutes, and the temperature and the humidity are decreased to 25° C. and a relative humidity of 50% over 80 minutes.