Composition for forming polarizer, polarizer, laminate, and image display device
Provided is a composition for forming a polarizer from which a polarizer with an excellent surface state can be formed, a polarizer, a laminate, and an image display device. The composition for forming a polarizer includes a polymerizable liquid crystal compound which has two or more rings selected from the group consisting of an aromatic ring and an alicyclic ring and two polymerizable groups and exhibits a liquid crystal state of a smectic phase, a monofunctional polymerizable compound which has two or more rings selected from the group consisting of an aromatic ring and an alicyclic ring and one polymerizable group, and a dichroic material, in which the number of atoms NA of the polymerizable liquid crystal compound and the number of atoms NB of the monofunctional polymerizable compound satisfy Expression (1), 0.35≤NB/NA≤0.65 (1).
1 . A composition for forming a polarizer comprising:
a polymerizable liquid crystal compound represented by formula (A-1) which exhibits a liquid crystal state of a smectic phase;
a monofunctional polymerizable compound represented by Formula (B-1) which has one polymerizable group; and
a dichroic material,
wherein the number of atoms NA of the polymerizable liquid crystal compound represented by formula (A-1) and the number of atoms NB of the monofunctional polymerizable compound represented by Formula (B-1) satisfy Expression (2),
wherein the content of the monofunctional polymerizable compound is in a range of 1 to 30 parts by mass in a case where the total mass of the solid content of the composition is set to 100 parts by mass,
0
.
4
0
≤
N
B
/
N
A
≤
0
.55
;
(
2
)
wherein the monofunctional polymerizable compound represented by Formula (B-1) is:
Q 3 -V 3 -SP 3 -X 3 -(Mb-Lb) nb -Tb (B-1)
wherein in Formula (B-1), Q 3 represents a polymerizable group,
V 3 and X 3 each independently represent a single bond or a divalent linking group,
SP 3 represents a divalent spacer group,
Mb represents an aromatic ring or an alicyclic ring which may have a substituent, where a plurality of Mbs may be the same as or different from each other,
Lb represents a divalent linking group selected from the group consisting of —O—, —(CF 2 ) g —, —Si(CH 3 ) 2 —, —(Si(CH 3 ) 2 O) g —, —(OSi(CH 3 ) 2 ) g — (g represents an integer of 1 to 10), —N(Z)—, —C(Z)═C(Z′)—, —C(Z)═N—, —N═C(Z)—, —C(Z) 2 —C(Z′) 2 —, —C(O)—, —OC(O)—, —C(O)O—, —O—C(O)O—, —N(Z)C(O)—, —C(O)N(Z)—, —C(Z)═C(Z′)—C(O)O—, —O—C(O)—C(Z)═C(Z′)—, —C(Z)═N—, —N═C(Z)—, —C(Z)═C(Z′)—C(O)N(Z″)—, —N(Z″)—C(O)—C(Z)═C(Z′)—, —C(Z)═C(Z′)—C(O)—S—, —S—C(O)—C(Z)═C(Z′)—, —C(Z)═N—N═C(Z′)— (Z, Z′, and Z″ each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, a cycloalkyl group, an aryl group, a cyano group, or a halogen atom), —C≡C—, —N═N—, —S—, —S(O)—, —S(O)(O)—, —(O)S(O)O—, —O(O)S(O)O—, —SC(O)—, —C(O)S—, and a group obtained by combining two or more of these groups, where a plurality of Lbs may be the same as or different from each other,
nb represents an integer of 2 to 5, and
Tb represents a hydrogen atom or a monovalent substituent;
wherein the monofunctional polymerizable compound represented by Formula (B-1) has a terminal atom located at a terminal end of Q 3 ;
wherein the monofunctional polymerizable compound represented by Formula (B-1) has a terminal atom located at a terminal end of Tb;
wherein the terminal atom of Q 3 is connected to the terminal atom of Tb by atoms bonded together between the terminal atom of Q 3 and the terminal atom of Tb;
wherein NB is a numerical value determined for the monofunctional polymerizable compound represented by Formula (B-1) is equal to the number of atoms bonded together between the terminal atom of Q 3 and the terminal atom of Tb of the monofunctional polymerizable compound, including the terminal atom of Q 3 and the terminal atom of Tb;
wherein the polymerizable liquid crystal compound represented by Formula (A-1) is:
Q 1 -V 1 -SP 1 -X 1 -(Ma-La) na -X 2 -SP 2 -V 2 -Q 2 (A-1)
wherein:
Q 1 and Q 2 each independently represent a polymerizable group,
V 1 , V 2 , X 1 , and X 2 each independently represent a single bond or a divalent linking group,
SP 1 and SP 2 each independently represent a divalent spacer group,
Ma represents an aromatic ring or an alicyclic ring which may have a substituent, where a plurality of Mas may be the same as or different from each other,
La represents a single bond or a divalent linking group, where a plurality of La may be the same as or different from each other, and
na represents an integer of 2 to 10;
wherein the polymerizable liquid crystal compound represented by Formula (A-1) has a terminal atom located at a terminal end of Q 1 ;
wherein the polymerizable liquid crystal compound represented by Formula (A-1) has a terminal atom located at a terminal end of Q 2 ;
wherein the terminal atom of Q 1 is connected to the terminal atom of Q 2 by atoms bonded together between the terminal atom of Q 1 and the terminal atom of Q 2 ; and
wherein NA is a numerical value determined for the polymerizable liquid crystal compound represented by Formula (A-1) is equal to the number of atoms bonded together between the terminal atom of Q 1 and the terminal atom of Q 2 of the polymerizable liquid crystal compound represented by Formula (A-1), including the terminal atom of Q 1 and the terminal atom of Q 2 .
2 . A polarizer which is formed of the composition for forming a polarizer according to claim 1 .
3 . A laminate comprising:
a base material;
an alignment film provided on the base material; and
the polarizer according to claim 2 , provided on the alignment film.
4 . An image display device comprising:
the polarizer according to claim 2 .
5 . An image display device comprising:
the laminate according to claim 3 .
6 . A polarizer which is formed of the composition for forming a polarizer according to claim 1 .
7 . A laminate comprising:
a base material;
an alignment film provided on the base material; and
the polarizer according to claim 6 , provided on the alignment film.
8 . An image display device comprising:
the polarizer according to claim 6 .