POLARIZING SHEET AND POLARIZING LENS PROVIDED WITH SAME
Provided is a polarizing sheet that can precisely impart a desired curved shape without causing whitening when bending is carried out. A polarizing sheet of an embodiment of the present invention having a structure in which a polyamide resin film (1), a polarizing film, and a polyamide resin film (2) are laminated in this order, wherein a retardation value of the polyamide resin film (1) is from 10 to 3000 nm, and the retardation value of the polyamide resin film (1) and a retardation value of the polyamide resin film (2) satisfy Formula (r): [Retardation Value of Polyamide Resin Film (1)]−[Retardation Value of Polyamide Resin Film (2)]≥10 nm (r).
1 . A polarizing sheet comprising a polyamide resin film (1), a polarizing film and a polyamide resin film (2), the polarizing sheet having a structure in which the polyamide resin film (1), the polarizing film and the polyamide resin film (2) are laminated in this order, wherein a retardation value of the polyamide resin film (1) is from 10 to 3000 nm, and the retardation value of the polyamide resin film (1) and a retardation value of the polyamide resin film (2) satisfy Formula (r):
[Retardation Value of Polyamide Resin Film (1)]−[Retardation Value of Polyamide Resin Film (2)]≥10 nm (r)
2 . The polarizing sheet according to claim 1 , wherein a thickness of the polyamide resin film (2) is from 10 to 2000 μm.
3 . The polarizing sheet according to claim 1 , wherein a polyamide resin composing the film (1) is an alicyclic polyamide resin.
4 . The polarizing sheet according to claim 3 , wherein the alicyclic polyamide resin has a repeating unit represented by Formula (ad) below:
where X represents a single bond or a divalent hydrocarbon group, L represents a divalent hydrocarbon group, R 1 and R 2 each represent an alkyl group, and m and n each represent an integer from 0 to 4.
5 . The polarizing sheet according to claim 1 , wherein the polarizing sheet has a curved shape.
6 . A polarizing lens comprising a structure in which a polyamide resin-molded layer is laminated on a surface of the polyamide resin film (2) of the polarizing sheet described in claim 1 .
7 . Spectacles comprising a polarizing lens described in claim 6 .
8 . The polarizing sheet according to claim 1 , wherein a polyamide resin composing the film (1) is a polycondensation product of a compound represented by Formula (a) and a compound represented by Formula (c) below;
H 2 N-L 1 -NH 2 (a)
where L 1 is a substituent obtained by removing two hydrogen atoms from a ring selected from the group consisting of a cycloalkene, crosslinking ring, and a linked ring
where the linked ring has a structure in which two or more rings selected from the group consisting of the cycloalkene rings and the crosslinking rings are bonded through a single bond or a linking group
HOOC-L 2 -COOH (c)
Where L 2 is a straight-chain or branched alkylene group having from 1 to 20 carbons or a straight-chain or branched alkenylene group having from 2 to 20 carbons.
9 . The polarizing sheet according to claim 1 , wherein a melting temperature or a glass transition temperature of the polyamide resin is from 100 to 350° C.
10 . The polarizing sheet according to claim 1 , wherein a polyamide resin composing the film (1) is a polycondensation product of a compound represented by Formula (a) and a compound represented by Formula (c) below,
H 2 N-L 1 -NH 2 (a)
where L 1 is a substituent obtained by removing two hydrogen atoms from a ring selected from the group consisting of a cycloalkene, crosslinking ring, and a linked ring
where the linked ring has a structure in which two or more rings selected from the group consisting of the cycloalkene rings and the crosslinking rings are bonded through a single bond or a linking group
HOOC-L 2 -COOH (c)
Where L 2 is a straight-chain or branched alkylene group having from 1 to 20 carbons or a straight-chain or branched alkenylene group having from 2 to 20 carbons.
and a melting temperature or a glass transition temperature of the polyamide resin is from 100 to 350° C.
11 . The polarizing sheet according to claim 1 , wherein the retardation value of the polyamide resin film (1) is from 1000 to 3000 nm.
12 . The polarizing sheet according to claim 1 , the retardation value of the polyamide resin film (2) is from 0 to 500 nm.
13 . The polarizing sheet according to claim 1 , wherein the retardation value of the polyamide resin film (1) is from 1000 to 3000 nm, and the retardation value of the polyamide resin film (2) is from 0 to 500 nm.
14 . A method for producing a polarizing sheet, the method comprising using a sheet having a structure in which the polyamide resin film (1), the polarizing film, and the polyamide resin film (2) are laminated in this order, wherein a retardation value of the polyamide resin film (1) is from 10 to 3000 nm, and the retardation value of the polyamide resin film (1) and a retardation value of the polyamide resin film (2) satisfy Formula (r):
[Retardation Value of Polyamide Resin Film (1)]−[Retardation Value of Polyamide Resin Film (2)]≥10 nm (r)
15 . The method for producing a polarizing sheet according to claim 14 , wherein a melting temperature or a glass transition temperature of the polyamide resin is from 100 to 350° C.
16 . The method for producing a polarizing sheet according to claim 14 , wherein the polyamide resin composing the film (1) is a polycondensation product of a compound represented by Formula (a) and a compound represented by Formula (c) below,
H 2 N-L 1 -NH 2 (a)
where L 1 is a substituent obtained by removing two hydrogen atoms from a ring selected from the group consisting of a cycloalkene, crosslinking ring, and a linked ring
where the linked ring has a structure in which two or more rings selected from the group consisting of the cycloalkene rings and the crosslinking rings are bonded through a single bond or a linking group
HOOC-L 2 -COOH (c)
Where L 2 is a straight-chain or branched alkylene group having from 1 to 20 carbons or a straight-chain or branched alkenylene group having from 2 to 20 carbons.
and a melting temperature or a glass transition temperature of the polyamide resin is from 100 to 350° C.
17 . The method for producing a polarizing sheet according to claim 14 , the retardation value of the polyamide resin film (2) is from 0 to 500 nm.
18 . The method for producing a polarizing sheet according to claim 14 , wherein the retardation value of the polyamide resin film (1) is from 1000 to 3000 nm, and the retardation value of the polyamide resin film (2) is from 0 to 500 nm.
19 . The spectacles according to claim 7 , wherein the spectacles are at least a pair of spectacles, sunglasses, and goggles.