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CN-122029462-A - Laminated optical film and image display device

CN122029462ACN 122029462 ACN122029462 ACN 122029462ACN-122029462-A

Abstract

The present invention provides a laminated optical film comprising at least a retardation film and an optical film other than a polyvinyl alcohol film laminated via a molecular adhesive layer, wherein the molecular adhesive layer is a cured layer of a molecular adhesive having at least one reactive group selected from silanol groups and alkoxysilyl groups, and when the laminate smoothness of the entire laminated optical film is β, β <0.45arcmin. The optical film is preferably a retardation film. The thickness of the molecular adhesive layer is preferably 1nm or more and 100nm or less. The thickness of the retardation film is preferably 5 μm or less.

Inventors

  • Haruki Tatsuya
  • Bamboo grass river Thailand is situated between
  • MITA SATOSHI

Assignees

  • 日东电工株式会社

Dates

Publication Date
20260512
Application Date
20240829
Priority Date
20231023

Claims (12)

  1. 1. A laminated optical film comprising at least a retardation film and an optical film other than a polyvinyl alcohol film laminated via a molecular adhesive, The molecular adhesive layer is a cured product layer of a molecular adhesive having at least one reactive group selected from silanol groups and alkoxysilyl groups, When the laminate smoothness of the entire laminated optical film is β, β<0.45arcmin。
  2. 2. The laminated optical film according to claim 1, wherein, The optical film is a retardation film.
  3. 3. The laminated optical film according to claim 1 or 2, wherein, The thickness of the molecular adhesive layer is 1nm or more and 100nm or less.
  4. 4. The laminated optical film according to any one of claim 1 to 3, wherein, The thickness of the phase difference film is less than 5 mu m.
  5. 5. The laminated optical film according to any one of claim 1 to 4, wherein, The molecular adhesive is a compound having a1 st reactive group RG1 and a2 nd reactive group RG2, The 1 st reactive group RG1 is at least one reactive group selected from azido, amino, epoxy and acryl, The 2 nd reactive group RG2 is at least one reactive group selected from silanol groups and alkoxysilyl groups.
  6. 6. The laminated optical film according to any one of claim 1 to 5, wherein, The molecular adhesive is a compound represented by the following general formula (1), G-E (1) In the general formula (1), E represents Si (R ') n (OA) 3-n , R' independently represents a chain hydrocarbon group having 1 to 4 carbon atoms in the case where a plurality of E's are present, A independently represents a hydrogen atom or a chain hydrocarbon group having 1 to 4 carbon atoms in the case where a plurality of E's are present, n represents an integer of 0 to 2, G represents a triazine ring C or an alkyl group D, The triazine ring C has Q 1 Q 2 ,Q 1 and Q 2 in the side chain and each independently represents N 3 or-NR 1 (R 2 ),R 1 and R 2 independently represents a hydrogen atom, a hydrocarbon group having 1 to 24 carbon atoms, an aminoalkyl group, or-R-Si (R') n (OA) 3-n , the alkyl group D has Q 3 in the hydrocarbon group having 1 to 24 carbon atoms, and Q 3 represents an azide group, an amino group, an epoxy group, and an acryl group.
  7. 7. The laminated optical film according to any one of claim 1 to 6, wherein, When the laminate smoothness of the film having a large value of laminate smoothness arcmin in the retardation film and the optical film is α, the following is satisfied: 。
  8. 8. a laminated optical film comprising a polarizing film further laminated on at least one side of a laminated optical film comprising a retardation film and an optical film other than a polyvinyl alcohol film laminated via a molecular adhesive, When the laminate smoothness of the entire laminated optical film is defined as beta', β’<0.45arcmin。
  9. 9. The laminated optical film according to claim 8, wherein, The optical film is a retardation film.
  10. 10. The laminated optical film according to claim 8 or 9, wherein, When the laminate smoothness of a film having a large value of laminate smoothness arcmin among the retardation film, the optical film, and the polarizing film is α', the following is satisfied: 。
  11. 11. an image display device using the laminated optical film according to any one of claims 1 to 7.
  12. 12. An image display device using the laminated optical film according to any one of claims 8 to 10.

Description

Laminated optical film and image display device Technical Field The present invention relates to a laminated optical film comprising at least a retardation film and an optical film other than a polyvinyl alcohol film laminated via a molecular adhesive. The laminated optical film may be used alone or in the form of a laminated optical film having a polarizing film or the like laminated thereon to form an image display device such as a Liquid Crystal Display (LCD), an organic EL display device, a CRT, a PDP, or the like. Background In general, image display devices such as liquid crystal display devices and organic EL display devices are provided with a laminated optical film. The image display device is expected to be used in various environments, but when used in an environment with high heat and humidity, the occurrence of display unevenness due to dimensional changes becomes a problem. In addition, display unevenness may be caused not only by dimensional change but also by surface irregularities of the adhesive, or by a laminated optical film laminated via the adhesive. In addition, in recent years, the thickness of the laminated optical film has been reduced, but in the case of bonding the optical films in thin layers, there is a problem that it is difficult to secure adhesion between the optical films. On the other hand, patent document 1 below describes a technique in which, in a polarizing plate including a polarizing film made of a polyvinyl alcohol-based resin and a light-transmitting support substrate laminated on at least one surface of the polarizing film via a bonding layer, the bonding layer is formed of a material containing a molecular bonding agent that connects the polarizing film and the support substrate by chemical bonding, in order to suppress appearance defects caused by thermal shrinkage of the polarizing film and to provide a polarizing plate excellent in durability. Prior art literature Patent literature WO2022/172755 patent document 1 Disclosure of Invention Problems to be solved by the invention The technique described in patent document 1 aims to suppress appearance defects caused by thermal shrinkage of a polyvinyl alcohol-based polarizing film, and does not mention any suppression of display unevenness of a laminated optical film including at least a retardation film. The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a laminated optical film in which an adhesive layer for laminating at least a retardation film and an optical film other than a polyvinyl alcohol film are thinned and display unevenness caused by the adhesive layer is reduced. The present invention also provides an image display device using the laminated optical film. Means for solving the problems The present inventors have conducted intensive studies to solve the above problems, and as a result, have found that the above object can be achieved by laminating a phase difference film and an optical film other than a polyvinyl alcohol film with a molecular adhesive layer as a cured product layer of a specific molecular adhesive, and controlling the smoothness of a laminate of the laminated optical film. Specifically, the present invention relates to a laminated optical film (1) comprising at least a retardation film and an optical film other than a polyvinyl alcohol film laminated via a molecular adhesive layer, wherein the molecular adhesive layer is a cured layer of a molecular adhesive having at least one reactive group selected from silanol groups and alkoxysilyl groups, and when the laminate smoothness of the entire laminated optical film is β, β <0.45arcmin. In the laminated optical film (1), a laminated optical film (2) is preferable, wherein the optical film is a retardation film. In the laminated optical film (1) or (2), the laminated optical film (3) is preferable, wherein the thickness of the molecular adhesive layer is 1nm or more and 100nm or less. In any one of the above laminated optical films (1) to (3), the laminated optical film (4) is preferable, wherein the thickness of the retardation film is 5 μm or less. In any one of the laminated optical films (1) to (4), the laminated optical film (5) is preferable, wherein the molecular adhesive is a compound having a 1 st reactive group RG1 and a2 nd reactive group RG2, the 1 st reactive group RG1 is at least one reactive group selected from an azide group, an amino group, an epoxy group and an acryl group, and the 2 nd reactive group RG2 is at least one reactive group selected from a silanol group and an alkoxysilyl group. In any one of the laminated optical films (1) to (5), the laminated optical film (6) is preferable, wherein the molecular adhesive is a compound represented by the following general formula (1). G-E (1) ( In the general formula (1), E represents Si (R ') n(OA)3-n, R' independently represents a chain hydrocarbon group having 1 to 4 carbon atoms when a p