US 11,940,640 B2
Polarizing sheet and polarizing lens provided with same
Toshihiko Fujinaka, Tokyo (JP); and Hitomi Omae, Tokyo (JP)
Assigned to DAICEL-EVONIK LTD., Tokyo (JP)
Filed by DAICEL-EVONIK LTD., Tokyo (JP)
Filed on Dec. 2, 2022, as Appl. No. 18/074,211.
Application 18/074,211 is a division of application No. 16/645,156, abandoned, previously published as PCT/JP2018/032651, filed on Sep. 3, 2018.
Claims priority of application No. 2017-171788 (JP), filed on Sep. 7, 2017.
Prior Publication US 2023/0089288 A1, Mar. 23, 2023
Int. Cl. G02B 5/30 (2006.01); G02B 1/04 (2006.01); G02C 7/12 (2006.01)
CPC G02B 5/305 (2013.01) [G02B 1/041 (2013.01); G02B 5/3083 (2013.01); G02C 7/12 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method for producing a polarizing sheet having a curved shape, the method comprising:
placing a polarizing sheet including a polyamide resin film (1), a polarizing film, and a polyamide resin film (2) disposed in this order in such a manner that the polyamide resin film (1) side of the polarizing sheet is in contact with a mold heated at a temperature from 80 to 120° C. for curved surface molding;
bringing the sheet into close contact with the mold; and
transferring a shape of the mold by a vacuum molding method to the sheet to bring the sheet to have a curved shape,
wherein a retardation value of the polyamide resin film (1) is from 2000 to 2500 nm, and the retardation value of the polyamide resin film (1) and a retardation value of the polyamide resin film (2) satisfy Formula (r):
2000 nm<[Retardation Value of Polyamide Resin Film (1)]−[Retardation Value of Polyamide Resin Film (2)]<2500 nm (r).