	US 12,466,914 B2
	Retardation film and applications thereof
Yoshiya Ota, Osaka (JP); Shinichi Kamei, Osaka (JP); and Nagayoshi Masuda, Osaka (JP)
Assigned to OSAKA GAS CHEMICALS CO., LTD., Osaka (JP)
Appl. No. 17/789,018
Filed by Osaka Gas Chemicals Co., Ltd., Osaka (JP)
PCT Filed Dec. 24, 2020, PCT No. PCT/JP2020/048351 § 371(c)(1), (2) Date Jun. 24, 2022, PCT Pub. No. WO2021/140927, PCT Pub. Date Jul. 15, 2021.
Claims priority of application No. 2020-001626 (JP), filed on Jan. 8, 2020.
Prior Publication US 2023/0091159 A1, Mar. 23, 2023
Int. Cl. C08G 63/185 (2006.01); B32B 27/08 (2006.01); B32B 27/34 (2006.01); B32B 27/36 (2006.01); C08L 67/00 (2006.01); C08L 77/00 (2006.01); G02B 1/04 (2006.01); G02B 5/30 (2006.01); G02F 1/13363 (2006.01); H10K 59/80 (2023.01)

CPC C08G 63/185 (2013.01) [B32B 27/08 (2013.01); B32B 27/34 (2013.01); B32B 27/36 (2013.01); C08L 67/00 (2013.01); C08L 77/00 (2013.01); G02B 1/04 (2013.01); G02B 5/3083 (2013.01); B32B 2250/24 (2013.01); B32B 2307/514 (2013.01); B32B 2307/518 (2013.01); B32B 2307/732 (2013.01); B32B 2457/20 (2013.01); G02F 1/13363 (2013.01); G02F 2413/12 (2013.01); H10K 59/8791 (2023.02)]

18 Claims

1. A retardation film comprising:

a polyester-series resin exhibiting a negative orientation birefringence and exhibiting a forward wavelength dispersibility in retardation, and

a polyamide-series resin exhibiting a positive orientation birefringence and exhibiting a flat dispersibility in retardation,

wherein the polyester-series resin and the polyamide-series resin have a difference of 0 to 20° C. in glass transition temperature, and

the retardation film is a laminated film comprising: a first layer containing the polyester-series resin, and a second layer containing the polyamide-series resin.