Transfer material, process for producing a color filter using the same, a color filter and liquid crystal display device
A transfer material comprising at least one optically anisotropic layer and at least one photosensitive polymer layer on at least one support, wherein said optically anisotropic layer comprises one or more compounds having a reactive group, and said photosensitive polymer layer comprises two or more types of photopolymerization initiators having different photoreaction mechanisms to each other, and a compound having a reactive group which can react with one or more of the reactive groups present in the optically anisotropic layer by the action of the at least one of said photopolymerization initiators. By using the transfer material, a color filter which contributes to reducing viewing angle dependence of color of a liquid crystal display device, and a liquid crystal display device having less corner non-uniformities and less viewing angle dependence of color.
1. A process for producing a liquid crystal cell substrate, which comprises the following steps [1] to [4] in this order:
[1] laminating a transfer material on a substrate;
[2] separating the support from the transfer material laminated on the substrate; and
[3] exposing the photosensitive polymer layer disposed on the substrate to light; and
[4] removing unnecessary parts of the photosensitive polymer layer and the optically anisotropic layer on the substrate,
wherein said transfer material comprises at least one optically anisotropic layer and at least one photosensitive polymer layer on at least one support,
said optically anisotropic layer comprises one or more compounds having a reactive group,
said photosensitive polymer layer comprises two or more types of photopolymerization initiators having different photoreaction mechanisms to each other, and a compound having a reactive group which can react with one or more of the reactive groups present in the optically anisotropic layer by the action of at least one of said photopolymerization initiators, and
the at least one optically anisotropic layer is arranged between the at least one support and the at least one photosensitive polymer layer.
2. A process for producing a liquid crystal cell substrate, which comprises the following steps [1] to [3] in this order:
[1] laminating a transfer material on a substrate;
[2] separating the support from the transfer material laminated on the substrate; and
[3] exposing the photosensitive polymer layer disposed on the substrate to light,
wherein said transfer material comprises at least one optically anisotropic layer and at least one photosensitive polymer layer on at least one support,
said optically anisotropic layer comprises one or more compounds having a reactive group,
said photosensitive polymer layer comprises two or more types of photopolymerization initiators having different photoreaction mechanisms to each other, and a compound having a reactive group which can react with one or more of the reactive groups present in the optically anisotropic layer by the action of at least one of said photopolymerization initiators, and
the at least one optically anisotropic layer is arranged between the at least one support and the at least one photosensitive polymer layer.
3. A liquid crystal cell substrate produced by the process according to claim 2 .
4. A liquid crystal display device comprising the liquid crystal cell substrate according to claim 3 .
5. The liquid crystal display device according to claim 4 , employing a VA or IPS mode as a liquid crystal mode.
6. The process according to claim 2 , wherein the optically anisotropic layer is a layer formed by coating with a solution comprising a liquid crystalline compound having a reactive group, and drying of the solution to thereby form a liquid crystal phase, and then applying heat or irradiating ionized radiation to the liquid crystal phase.
7. The process according to claim 6 , wherein the ionized radiation is polarized ultraviolet radiation.
8. The process according to claim 6 , wherein the liquid crystalline compound having a reactive group is a compound having an ethylenic unsaturated group.
9. The process according to claim 6 , wherein the liquid crystalline compound is a rod-like liquid crystalline compound.
10. The process according to claim 6 , wherein the liquid crystal phase is a cholesteric phase.
11. The process according to claim 2 , wherein the optically anisotropic layer is formed of a composition comprising a radical polymerization initiator.
12. The process according to claim 2 , wherein at least one of the photopolymerization initiators is a radical polymerization initiator.
13. The process according to claim 2 , wherein at least one of the photopolymerization initiators is a cationic polymerization initiator.
14. The process according to claim 2 , wherein the optically anisotropic layer comprises one or more of compounds having one or more groups selected from the group consisting of carboxy, hydroxy, amino, and thiol, and the photosensitive polymer layer comprises one or more compounds having epoxy group.
15. The process according to claim 2 , wherein the optically anisotropic layer comprises one or more of compounds having epoxy group, and the photosensitive polymer layer comprises one or more compounds having one or more groups selected from the group consisting of carboxy, hydroxy, amino, and thiol.
16. The process according to claim 2 , wherein the optically anisotropic layer is formed directly on the support or directly on a rubbed surface of an alignment layer formed on the support.
17. The process according to claim 2 , wherein a frontal retardation (Re) value of the optically anisotropic layer is not zero, and the optically anisotropic layer gives substantially equal retardation values for light of a wavelength A nm coming respectively in a direction rotated by +40° and in a direction rotated by −40° with respect to a normal direction of a layer plane using an in-plane slow axis as a tilt axis (a rotation axis).
18. The process according to claim 2 , wherein the optically anisotropic layer has a frontal retardation (Re) value of 60 to 200 nm, and gives a retardation of 50 to 250 nm for light of a wavelength λ nm coming in a direction rotated by +40° with respect to a normal direction of a layer plane using an in-plane slow axis as a tilt axis (a rotation axis).
19. The process according to claim 2 , wherein the photosensitive polymer layer comprises a dye or a pigment.