CN-121975260-A - Composition for forming cured film, alignment material, and retardation material

Abstract

The present invention addresses the problem of providing a composition for forming a cured film for forming an alignment material which has excellent solvent resistance and can align a polymerizable liquid crystal with high sensitivity and which has little rejection of liquid crystals. A composition for forming a cured film, which comprises (A) a compound having a photo-alignment group, (B) a polymer having a structural unit having an N-hydroxymethyl group or an N-alkoxymethyl group, and (C) a cyclodextrin derivative having a part or all of the hydroxyl groups modified.

Inventors

• Shimo Takayoshi
• Haruki Tomoya
• YADA KENZO

Assignees

• 日产化学株式会社

Dates

Publication Date

20260505

Application Date

20240725

Priority Date

20230725

Claims (9)

1. 1. A cured film forming composition comprising: Component A is a compound having a photo-alignment group, Component B comprising a polymer having a structural unit having an N-hydroxymethyl group or an N-alkoxymethyl group, and And component C, cyclodextrin derivative with part or all of hydroxyl groups modified.
2. 2. The composition for forming a cured film according to claim 1, wherein the photo-alignment group of component A is a functional group having a structure that undergoes photo-dimerization or photo-isomerization.
3. 3. The composition for forming a cured film according to claim 1, wherein the photo-alignment group of component A is a cinnamoyl group.
4. 4. The composition for forming a cured film according to claim 1, wherein the photo-alignment group of component A is a group having an azobenzene structure.
5. 5. The composition for forming a cured film according to claim 1, The component B is a polymer further comprising a structural unit having a partial structure represented by the following formula (1), In the formula (1), Q 1 represents an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or a phenyl group, Q 2 represents O, S or NQ 3 ,Q 3 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and the broken line represents a bond.
6. 6. The composition for forming a cured film according to claim 1, further comprising a crosslinking catalyst as component D.
7. 7. The composition for forming a cured film according to claim 1, further comprising an adhesion-improving component as component E.
8. 8. An alignment material obtained by using the composition for forming a cured film according to any one of claims 1 to 7.
9. 9. A retardation material comprising a cured film obtained from the composition for forming a cured film according to any one of claims 1to 7.

Description

Composition for forming cured film, alignment material, and retardation material The present application is a divisional application with application number 202480048175.1, the application name of "composition for forming cured film, orientation material and phase difference material", and application with application day 2024, 7 and 25. Technical Field The present invention relates to a cured film-forming composition, an alignment material, and a retardation material. Background In the case of a 3D display of a circularly polarized glasses type, a phase difference material is generally disposed on a display element such as a liquid crystal panel for forming an image. The phase difference material is formed by regularly disposing a plurality of 2 kinds of phase difference regions having different phase difference characteristics. Hereinafter, in this specification, a phase difference material patterned so as to arrange a plurality of phase difference regions having different phase difference characteristics is referred to as a patterned phase difference material. The patterned retardation material can be produced by optically patterning a retardation material formed of a polymerizable liquid crystal as disclosed in, for example, patent document 1. The optical patterning of the phase difference material formed of the polymerizable liquid crystal uses a photo-alignment technique known in the formation of alignment materials for liquid crystal panels. That is, a coating film made of a material having a light-directing property is provided on a substrate, and 2 kinds of polarized light having different polarization directions are irradiated thereto. Further, a photo-alignment film was obtained as an alignment material in which 2 kinds of liquid crystal alignment regions having different alignment control directions of liquid crystals were formed. A phase difference material in the form of a solution containing a polymerizable liquid crystal is applied to the photo-alignment film to orient the polymerizable liquid crystal. Then, the oriented polymerizable liquid crystal is cured to form a patterned retardation material. The antireflection film of the organic EL display is composed of a linear polarizing plate and a 1/4 wavelength retardation plate, and converts external light directed to the panel surface of the image display panel into linear polarized light by the linear polarizing plate, and then into circular polarized light by the 1/4 wavelength retardation plate. Here, the external light based on the circularly polarized light is reflected on the surface of the image display panel or the like, but the rotation direction of the polarized light surface is reversed at the time of the reflection. As a result, the reflected light is converted into linearly polarized light in a direction shielded by the linearly polarizing plate by the 1/4 wavelength phase difference plate, and then shielded by the linearly polarizing plate, and as a result, emission to the outside is significantly suppressed. Regarding the 1/4 wavelength retardation plate, patent document 2 proposes a method of forming the optical film by combining a 1/2 wavelength plate and a 1/4 wavelength plate to form the 1/4 wavelength retardation plate, thereby forming the optical film by the inverse dispersion characteristic. In the case of this method, the optical film can be configured by the inverse dispersion characteristic using a liquid crystal material based on the positive dispersion characteristic in a wide band for display of a color image. In recent years, as a liquid crystal material applicable to the retardation layer, a material having an inverse dispersion property has been proposed (patent documents 3 and 4). According to the liquid crystal material having such an inverse dispersion characteristic, instead of forming the 1/4 wavelength retardation plate by combining 2 retardation layers of the 1/2 wavelength plate and the 1/4 wavelength plate, the retardation layer is formed by a single layer to ensure the inverse dispersion characteristic, and thus an optical film capable of ensuring a desired retardation in a wide wavelength band can be realized by a simple structure. An alignment layer is used for aligning liquid crystals. As a method for forming an alignment layer, for example, a rubbing method and a photo-alignment method are known, and the photo-alignment method is useful in that static electricity and dust, which are problems of the rubbing method, are not generated, and control of the alignment treatment can be performed quantitatively. As a material having a photo-alignment property which can be used for forming an alignment material using a photo-alignment method, an acrylic resin, a polyimide resin, or the like having a photo-dimerization site such as a cinnamoyl group or a chalcone group in a side chain is known. These resins are reported to exhibit properties of controlling the alignment of liquid crystals (hereinafter also r