Composition and liquid crystal display device
There is provided a composition including a first polymer compound having a photoreactive functional group, a second polymer compound, and an ultraviolet absorber having a benzotriazole skeleton, wherein a content of the ultraviolet absorber is less than 20 parts by mass per 100 parts by mass of a total of the first polymer compound and the second polymer compound.
1. A composition comprising a first polymer compound having a photoreactive functional group, a second polymer compound, and an ultraviolet absorber having a benzotriazole skeleton,
wherein a content of the ultraviolet absorber is less than 20 parts by mass per 100 parts by mass of a total of the first polymer compound and the second polymer compound,
wherein the ultraviolet absorber is a compound represented by formula (1) below:
(where R 1 and R 2 each independently represents a hydrocarbon group of 1 to 30 carbon atoms),
wherein the first polymer compound is a compound represented by one of the following formulae: (101); (20) and (Z-224); and (104), and
wherein the second polymer compound is a compound represented by one of the following formulae: (102); and (201),
(where p represents the degree of polymerization),
(where r is 0<r<1.0, (1-r) and r each represents the copolymerization ratio of a structural unit, and p represents the degree of polymerization),
(where p represents the degree of polymerization),
(where p represents the degree of polymerization),
(where p represents the degree of polymerization).
2. The composition according to claim 1 , wherein the ultraviolet absorber has a molecular weight of 600 or more.
3. The composition according to claim 1 , wherein the content of the ultraviolet absorber is 5 parts by mass or more per 100 parts by mass of the total of the first polymer compound and the second polymer compound.
4. The composition according to claim 1 , wherein
the first polymer compound is a polyimide, a polyamic acid, a polyamide, a polysiloxane, or a polyvinyl, and
the second polymer compound is a polyimide, a polyamic acid, a polyamide, a polysiloxane, or a polyvinyl.
5. The composition according to claim 1 , wherein the photoreactive functional group is a group having an azobenzene skeleton, a cinnamate skeleton, or a cyclobutane ring.
6. A liquid crystal display device comprising:
a pair of substrates,
a liquid crystal layer sandwiched between the pair of substrates, and
alignment films disposed on surfaces of the pair of substrates, the surfaces being on a side closer to the liquid crystal layer,
wherein the liquid crystal layer contains a liquid crystal material,
at least one of the alignment films on the pair of substrates is a multilayer film including:
a first alignment film disposed on the side closer to the liquid crystal layer, and
a second alignment film disposed between the first alignment film and the substrate,
the first alignment film contains the first polymer compound,
the second alignment film contains the second polymer compound, and
the multilayer film is formed from the composition according to claim 1 .
7. The liquid crystal display device according to claim 6 , wherein the liquid crystal material contains a compound having an alkenyl skeleton.
8. The liquid crystal display device according to claim 7 , wherein the liquid crystal material is at least one selected from the group consisting of compounds represented by formulae (C1) to (C4) below:
(where a and b, each independently represents an integer of 1 to 6).
9. The liquid crystal display device according to claim 6 , wherein
the liquid crystal material is negative, and
the photoreactive functional group is a group having a cyclobutane ring.