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CN-116635779-B - Light absorbing anisotropic film, optical film and liquid crystal display device

CN116635779BCN 116635779 BCN116635779 BCN 116635779BCN-116635779-B

Abstract

The present invention addresses the problem of providing a light-absorbing anisotropic film, an optical film, and a liquid crystal display device, each of which has few defects and a high degree of orientation even when the concentration of a dichroic material is high. The light absorbing anisotropic film of the present invention is formed from a liquid crystal composition containing a liquid crystalline compound and a dichroic material, wherein the total amount of the dichroic material represented by formula (C-1) and the dichroic material represented by formula (C-2) is 4.5 mass% or more relative to the total solid content mass of the liquid crystal composition, and the liquid crystalline compound is vertically aligned. In the case where R a1 and R a2 are the same group, -N (R b11 )(R b12 ) and-N (R b21 )(R b22 ) are different groups. In the case where R a1 and R a2 are different groups, the groups-N (R b11 )(R b12 ) and-N (R b21 )(R b22 ) may be the same groups or different groups.

Inventors

  • HOSHINO TAKASHI
  • NISHIMURA NAOYA
  • WATANABE SHINYA

Assignees

  • 富士胶片株式会社

Dates

Publication Date
20260505
Application Date
20211216
Priority Date
20201225

Claims (11)

  1. 1. A light absorbing anisotropic film formed of a liquid crystal composition containing a liquid crystalline compound, a dichroic substance represented by formula (C-1) and a dichroic substance represented by formula (C-2), The total of the contents of the dichroic material represented by the formula (C-1) and the dichroic material represented by the formula (C-2) is 4.5 mass% or more relative to the total solid content mass of the liquid crystal composition, The liquid crystalline compound is oriented vertically, In the formula (C-1) and the formula (C-2), R a1 and R a2 each independently represent a hydrogen atom, a C1-20 aliphatic hydrocarbon group which may have a C1 substituent, or a C1-substituted group-CH 2 -constituting the C1-20 aliphatic hydrocarbon group which may have a C1 substituent, Ara and Arc each independently represent a 2-valent aromatic group which may have a 1-valent substituent, R b11 and R b21 each independently represent a hydrogen atom, a C1-20 aliphatic hydrocarbon group which may have a C1-20 substituent, or a C1-substituted group which constitutes-CH 2 -of a C1-20 aliphatic hydrocarbon group which may have a C1-20 substituent, R b22 is a 1-valent aliphatic hydrocarbon group having 1 to 20 carbon atoms and having 1-valent substituent, or a 1-valent group substituted with 2-valent substituent-CH 2 -constituting a 1-valent aliphatic hydrocarbon group having 1 to 20 carbon atoms and having 1-valent substituent, wherein the 1-valent aliphatic hydrocarbon group in R b22 is a saturated aliphatic hydrocarbon group, R b12 represents a C1-20 aliphatic hydrocarbon group having a 1-valent substituent or a C1-20-valent group in which-CH 2 -constituting the C1-20 aliphatic hydrocarbon group which may have a 1-valent substituent is substituted with a 2-valent substituent, Na and nc independently represent an integer of 0 to 3, na+nc is 2 or more, However, in the case where R a1 and R a2 are the same group, -N (R b11 ）（R b12 ) and-N (R b21 ）（R b22 ) are different groups, and in the case where R a1 and R a2 are different groups, -N (R b11 ）（R b12 ) and-N (R b21 ）（R b22 ) may be the same group or different groups.
  2. 2. The light-absorbing anisotropic film of claim 1, wherein, The total of the contents of the dichroic material represented by the formula (C-1) and the dichroic material represented by the formula (C-2) is 6.5 mass% or more relative to the total solid content mass of the liquid crystal composition.
  3. 3. The light absorbing anisotropic film according to claim 1 or 2, wherein, In the liquid crystal composition, the mass ratio of the content of the dichroic material represented by the formula (C-1) to the content of the dichroic material represented by the formula (C-2) is 0.100 to 10.0.
  4. 4. The light absorbing anisotropic film according to claim 1 or 2, wherein, In the formula (C-1), the value of the Hansen solubility parameter of R b12 is equal to or more than the value of the Hansen solubility parameter of R b11 , In the formula (C-2), the value of the Hansen solubility parameter of R b22 is equal to or more than the value of the Hansen solubility parameter of R b21 , The absolute value of the difference between the hansen solubility parameter of R b12 in the formula (C-1) and R b22 in the formula (C-2) is 3.0 or less.
  5. 5. The light-absorbing anisotropic film of claim 4, wherein, The absolute value of the difference between the hansen solubility parameter of R b12 in the formula (C-1) and R b22 in the formula (C-2) is 1.0 or less.
  6. 6. The light absorbing anisotropic film according to claim 1 or 2, wherein, In R b12 in the formula (C-1), the 1-valent substituent is a hydroxyl group, a halogen atom, a cyano group or a sulfonic acid group, The 2-valent substituent is-O-, -C (=O) -, -N (R c1 ) -or a group formed by combining more than 2 groups, and R c1 represents a hydrogen atom or an alkyl group.
  7. 7. The light absorbing anisotropic film according to claim 1 or 2, wherein, The liquid crystalline compound includes a high molecular liquid crystalline compound.
  8. 8. An optical film, comprising: transparent film substrate The light absorbing anisotropic film according to any one of claims 1 to 7, disposed on the transparent film substrate.
  9. 9. The optical film of claim 8, further comprising an orientation film between the transparent film substrate and the light absorbing anisotropic film.
  10. 10. The optical film according to claim 8 or 9, further having a polarizer having an absorption axis in-plane, and being used for controlling viewing angle.
  11. 11. A display device having the optical film of claim 10 and a display element.

Description

Light absorbing anisotropic film, optical film and liquid crystal display device Technical Field The invention relates to a light absorption anisotropic film, an optical film and a liquid crystal display device. Background In order to prevent peeping or viewing angle control of an image display device, a technique using a light absorbing anisotropic film having an absorption axis in a thickness direction is known. For example, patent document 1 discloses a viewing angle control system including a dichroic material and having a polarizer (light absorbing anisotropic film) having an absorption axis at an angle of 0 ° to 45 ° with respect to the normal line of the film surface. Technical literature of the prior art Patent literature Patent document 1 Japanese patent application laid-open No. 2009-145776 Disclosure of Invention Technical problem to be solved by the invention For peeping prevention or viewing angle control of an image display device, an important point is to ensure high light shielding properties. Therefore, an important point is to increase the concentration of the dichroic material in the light absorbing anisotropic film and to orient the dichroic material in the light alignment film with a high degree of alignment. However, if the concentration of the dichroic material is increased, defects derived from the dichroic material may be generated in the light absorbing anisotropic film. Accordingly, an object of the present invention is to provide a light absorbing anisotropic film, an optical film, and a liquid crystal display device, each of which has few defects and a high degree of alignment even when the concentration of a dichroic material is high. Means for solving the technical problems As a result of intensive studies to solve the above problems, the present inventors have found that a light absorbing anisotropic film having few defects and a high degree of orientation can be obtained by using 2 or more kinds of dichroic materials having different structures even when the dichroic materials are contained in a high concentration of 4.5 mass% or more relative to the total solid content mass of the liquid crystal composition, and completed the present invention. That is, the present inventors have found that the above problems can be solved by the following configuration. [1] A light-absorbing anisotropic film comprising a liquid crystal composition containing a liquid crystalline compound, a dichroic material represented by the following formula (C-1) and a dichroic material represented by the following formula (C-2), The total of the contents of the dichroic material represented by the following formula (C-1) and the dichroic material represented by the following formula (C-2) is 4.5 mass% or more relative to the total solid content mass of the liquid crystal composition, The liquid crystalline compound is oriented vertically. In the following formula (C-1) and the following formula (C-2), R a1 and R a2 each independently represent a hydrogen atom, a C1-20 aliphatic hydrocarbon group which may have a C1-20 substituent, or a C1-substituted group-CH 2 -which constitutes a C1-20 aliphatic hydrocarbon group which may have a C1-20 substituent. Ara and Arc each independently represent a 2-valent aromatic group which may have a 1-valent substituent. R b11、Rb21 and R b22 each independently represent a hydrogen atom, a C1-20 aliphatic hydrocarbon group which may have a C1-20 substituent, or a C1-substituted group which constitutes-CH 2 -of a C1-20 aliphatic hydrocarbon group which may have a C1-20 substituent. R b12 represents a C1-20 aliphatic hydrocarbon group having a C1-20 substituent, or a C1-substituted C2-substituted C1-CH 2 -group constituting a C1-20 aliphatic hydrocarbon group which may have a C1-20 substituent. Na and nc independently represent an integer of 0 to 3, and na+nc is 2 or more. However, in the case where R a1 and R a2 are the same group, the groups-N (R b11)(Rb12) and-N (R b21)(Rb22) are different groups. In the case where R a1 and R a2 are different groups, the groups-N (R b11)(Rb12) and-N (R b21)(Rb22) may be the same or different groups. [2] The light absorbing anisotropic film according to [1], wherein, The total content of the dichroic material represented by the following formula (C-1) and the dichroic material represented by the following formula (C-2) is 6.5 mass% or more relative to the total solid content mass of the liquid crystal composition. [3] The light-absorbing anisotropic film according to [1] or [2], wherein, In the liquid crystal composition, the mass ratio of the content of the dichroic material represented by the following formula (C-1) to the content of the dichroic material represented by the following formula (C-2) is 0.100 to 10.0. [4] The light absorbing anisotropic film according to any of [1] to [3], wherein, In the formula (C-1), the value of the Hansen solubility parameter of R b12 is equal to or greater than the value of the Hansen solubility p