JP7156294B2 - Optically anisotropic layer and its manufacturing method, optically anisotropic laminate and its manufacturing method, optically anisotropic transfer member, polarizing plate, and image display device - Google Patents

Description

The present invention provides an optically anisotropic layer and a method for producing the same; an optically anisotropic laminate comprising the optically anisotropic layer and a method for producing the same; and an optically anisotropic layer comprising the optically anisotropic layer. a polarizing plate, a polarizing plate, and an image display device;

2. Description of the Related Art Image display devices such as liquid crystal display devices and organic electroluminescence display devices are provided with various optical films. Hereinafter, "organic electroluminescence" may be referred to as "organic EL" as appropriate. Techniques related to such optical films have been conventionally studied as shown in Patent Documents 1 to 10.

JP 2015-14712 A Japanese Patent Application Laid-Open No. 2015-57646 (corresponding publication: US Patent Application Publication No. 2015/041051) Japanese Patent Publication No. 2014-513323 Japanese Patent Application Publication No. 2014-520192 (corresponding publication: US Patent Application Publication No. 2014/116292) Japanese Patent Application Publication No. 2014-520288 (corresponding publication: US Patent Application Publication No. 2014/116293) Japanese Patent Application Laid-Open No. 2010-20269 (corresponding publication: US Patent Application Publication No. 2009/086131) JP 2010-195858 A Japanese Patent Application Laid-Open No. 2010-235878 (corresponding publication: US Patent Application Publication No. 2010/245728) Japanese Patent Application Laid-Open No. 2010-254949 (corresponding publication: US Patent Application Publication No. 2010/245744) JP 2008-268336 A

A circularly polarizing plate may be provided on the display surface of the image display device. Here, the term "circularly polarizing plate" includes not only a circularly polarizing plate in a narrow sense but also an elliptically polarizing plate. As the circularly polarizing plate, an optical film comprising a linear polarizer and an optically anisotropic layer is usually used. By providing a circularly polarizing plate on the display surface of the image display device, it is possible to suppress the reflection of external light when the display surface is viewed from the front direction, and to allow the light for displaying images to pass through polarized sunglasses. Therefore, it is possible to improve the visibility of the image.

However, even if a conventional general circularly polarizing plate is provided on the display surface of the image display device, it is difficult to suppress the reflection of external light when the display surface is viewed from an inclined direction, and the light used to display the image is difficult to suppress. It was difficult to transmit through polarized sunglasses.

Therefore, it is conceivable to provide the circularly polarizing plate with a positive C film. A positive C film is a film in which refractive indices nx, ny and nz satisfy nz>nx≧ny. By providing the positive C film on the circularly polarizing plate, it is possible to suppress the reflection of external light when the display surface is viewed from an inclined direction, and to allow the light for displaying an image to pass through polarized sunglasses.

Furthermore, as the positive C film, a film having a retardation Rth in the thickness direction exhibiting reverse wavelength dispersion is preferable. Here, the retardation Rth in the thickness direction exhibits reverse wavelength dispersion, which means that the retardation in the thickness direction Rth(450) and Rth(550) at wavelengths of 450 nm and 550 nm are equal to Rth(450)/Rth(550) <1.00 is satisfied. By providing the circularly polarizing plate with a positive C film in which the retardation Rth in the thickness direction exhibits reverse wavelength dispersion in this way, the reflection of external light is suppressed in a wide wavelength range when the display surface is viewed from an inclined direction. Or, the light that displays the image can be transmitted through polarized sunglasses. Therefore, the visibility of the image displayed on the display surface can be particularly effectively improved.

However, with conventional techniques, it is not easy to produce a positive C film in which the retardation Rth in the thickness direction exhibits reverse wavelength dispersion. For example, as described in Patent Documents 1 and 2, production methods using liquid crystal compounds are conceivable. However, in the method using an alignment film as described in Patent Documents 1 and 2, it is required to adjust compatibility between the alignment film and the liquid crystal compound, and the adjustment is complicated. Furthermore, the use of an alignment film may lead to an increase in cost because the process of coating the alignment film on the substrate increases.

The present invention has been invented in view of the above problems, and can be used as a positive C plate exhibiting reverse wavelength dispersion in retardation Rth in the thickness direction, which can be manufactured without using an alignment film. an optically anisotropic layer and a method for producing the same; an optically anisotropic laminate comprising the optically anisotropic layer and a method for producing the same; and an optically anisotropic transfer member, a polarizing plate and a An object of the present invention is to provide an image display device;

但し、
Ｇ^ａは、置換基を有していてもよい炭素数１～３０の２価の有機基を表し、
Ｙ^ａは、化学的な単結合、－Ｏ－、－Ｃ（＝Ｏ）－、－Ｃ（＝Ｏ）－Ｏ－、－Ｏ－Ｃ（＝Ｏ）－、－Ｏ－Ｃ（＝Ｏ）－Ｏ－、－Ｃ（＝Ｏ）－Ｓ－、－Ｓ－Ｃ（＝Ｏ）－、－ＮＲ^１１－Ｃ（＝Ｏ）－、－Ｃ（＝Ｏ）－ＮＲ^１１－、－Ｏ－Ｃ（＝Ｏ）－ＮＲ^１１－、－ＮＲ^１１－Ｃ（＝Ｏ）－Ｏ－、－Ｓ－、－Ｎ＝Ｎ－、または、－Ｃ≡Ｃ－を表し、Ｒ^１１は、炭素数１～６のアルキル基を表し、
Ｆｘ^１およびＦｘ^２は、それぞれ独立して、芳香族炭化水素環および芳香族複素環の少なくとも一方を有する有機基を表し、
Ｑは、水素原子、または、置換基を有していてもよい炭素数１～６のアルキル基を表し、
Ｒ^Ｉ～Ｒ^ＩＶは、それぞれ独立して、水素原子；ハロゲン原子；炭素数１～６のアルキル基；シアノ基；ニトロ基；炭素数１～６のハロゲン化アルキル基；炭素数１～６のアルコキシ基；－ＯＣＦ_３；－Ｃ（＝Ｏ）－Ｏ－Ｒ^ａ；または、－Ｏ－Ｃ（＝Ｏ）－Ｒ^ａを表し、Ｒ^ａは、置換基を有していてもよい炭素数１～２０のアルキル基、置換基を有していてもよい炭素数２～２０のアルケニル基、置換基を有していてもよい炭素数３～１２のシクロアルキル基、または、置換基を有していてもよい炭素数６～１２の芳香族炭化水素環基を表し、
Ｒ^０は、ハロゲン原子；炭素数１～６のアルキル基；シアノ基；ニトロ基；炭素数１～６のハロゲン化アルキル基；炭素数１～６のアルコキシ基；－ＯＣＦ_３；－Ｃ（＝Ｏ）－Ｏ－Ｒ^ａ；または－Ｏ－Ｃ（＝Ｏ）－Ｒ^ａを表し、
ｐは０～３の整数を表し、
ｐ１は０～４の整数を表し、
ｐ２は０または１を表し、
Ｙ^１～Ｙ⁸は、それぞれ独立して、化学的な単結合、－Ｏ－、－Ｏ－ＣＨ_２－、－ＣＨ_２－Ｏ－、－Ｏ－ＣＨ_２－ＣＨ_２－、－ＣＨ_２－ＣＨ_２－Ｏ－、－Ｃ（＝Ｏ）－Ｏ－、－Ｏ－Ｃ（＝Ｏ）－、－Ｏ－Ｃ（＝Ｏ）－Ｏ－、－Ｃ（＝Ｏ）－Ｓ－、－Ｓ－Ｃ（＝Ｏ）－、－ＮＲ^１３－Ｃ（＝Ｏ）－、－Ｃ（＝Ｏ）－ＮＲ^１３－、－ＣＦ_２－Ｏ－、－Ｏ－ＣＦ_２－、－ＣＨ_２－ＣＨ_２－、－ＣＦ_２－ＣＦ_２－、－Ｏ－ＣＨ_２－ＣＨ_２－Ｏ－、－ＣＨ＝ＣＨ－Ｃ（＝Ｏ）－Ｏ－、－Ｏ－Ｃ（＝Ｏ）－ＣＨ＝ＣＨ－、－ＣＨ_２－Ｃ（＝Ｏ）－Ｏ－、－Ｏ－Ｃ（＝Ｏ）－ＣＨ_２－、－ＣＨ_２－Ｏ－Ｃ（＝Ｏ）－、－Ｃ（＝Ｏ）－Ｏ－ＣＨ_２－、－ＣＨ_２－ＣＨ_２－Ｃ（＝Ｏ）－Ｏ－、－Ｏ－Ｃ（＝Ｏ）－ＣＨ_２－ＣＨ_２－、－ＣＨ_２－ＣＨ_２－Ｏ－Ｃ（＝Ｏ）－、－Ｃ（＝Ｏ）－Ｏ－ＣＨ_２－ＣＨ_２－、－ＣＨ＝ＣＨ－、－Ｎ＝ＣＨ－、－ＣＨ＝Ｎ－、－Ｎ＝Ｃ（ＣＨ_３）－、－Ｃ（ＣＨ_３）＝Ｎ－、－Ｎ＝Ｎ－、または、－Ｃ≡Ｃ－を表し、Ｒ^１３は、水素原子または炭素数１～６のアルキル基を表し、
Ａ^１およびＡ^２並びにＢ^１およびＢ^２は、それぞれ独立して、置換基を有していてもよい環状脂肪族基、または、置換基を有していてもよい芳香族基を表し、
Ｇ^１およびＧ^２は、それぞれ独立して、炭素数１～３０の２価の脂肪族炭化水素基、および、炭素数３～３０の２価の脂肪族炭化水素基に含まれる－ＣＨ_２－の少なくとも一つが、－Ｏ－、－Ｓ－、－Ｏ－Ｃ（＝Ｏ）－、－Ｃ（＝Ｏ）－Ｏ－、－Ｏ－Ｃ（＝Ｏ）－Ｏ－、－ＮＲ^１４－Ｃ（＝Ｏ）－、－Ｃ（＝Ｏ）－ＮＲ^１４－、－ＮＲ^１４－、または、－Ｃ（＝Ｏ）－に置換された基のいずれかの有機基を表し、但し－Ｏ－または－Ｓ－がそれぞれ２以上隣接して介在する場合を除き、Ｒ^１４は、水素原子または炭素数１～６のアルキル基を表し、
Ｐ^１およびＰ^２は、それぞれ独立して、置換基を有していてもよい炭素数２～１０のアルケニル基を表し、
ｎおよびｍは、それぞれ独立して、０または１である。
〔２〕 前記化合物１が、下記式（Ｂ１）～（Ｂ５）のいずれかで表される化合物である、〔１〕に記載の光学異方性層。

〔３〕 前記重合体が、ポリビニルカルバゾール、ポリフマル酸エステル及びセルロース誘導体からなる群より選ばれる少なくとも１種類の重合体である、〔１〕又は〔２〕に記載の光学異方性層。
〔４〕 前記光学異方性層の全固形分における前記化合物１の比率が、４０重量％～７０重量％である、〔１〕～〔３〕のいずれか一項に記載の光学異方性層。
〔５〕 波長５９０ｎｍにおける前記光学異方性層の面内レターデーションＲｅ（Ａ５９０）、及び、波長５９０ｎｍにおける前記光学異方性層の厚み方向のレターデーションＲｔｈ（Ａ５９０）が、下記式（３）及び（４）：
Ｒｅ（Ａ５９０）≦１０ｎｍ （３）
－２００ｎｍ≦Ｒｔｈ（Ａ５９０）≦－１０ｎｍ （４）
を満たす、〔１〕～〔４〕のいずれか一項に記載の光学異方性層。
〔６〕 基材と、〔１〕～〔５〕のいずれか一項に記載の光学異方性層とを備えた、光学異方性転写体。
〔７〕 〔１〕～〔５〕のいずれか一項に記載の光学異方性層と、位相差層とを備え、
前記位相差層の面内方向であって最大の屈折率を与える方向の屈折率ｎｘ（Ｂ）、前記位相差層の前記面内方向であって前記ｎｘ（Ｂ）の方向に垂直な方向の屈折率ｎｙ（Ｂ）、及び、前記位相差層の厚み方向の屈折率ｎｚ（Ｂ）が、ｎｘ（Ｂ）＞ｎｙ（Ｂ）≧ｎｚ（Ｂ）を満たす、光学異方性積層体。
〔８〕 前記位相差層が、脂環式構造含有重合体を含む延伸フィルム層である、〔７〕記載の光学異方性積層体。
〔９〕 前記位相差層が、斜め延伸フィルム層である、〔８〕記載の光学異方性積層体。
〔１０〕 前記位相差層が、複層構造を有する延伸フィルム層である、〔７〕～〔９〕のいずれか一項に記載の光学異方性積層体。
〔１１〕 波長４５０ｎｍにおける前記位相差層の面内レターデーションＲｅ（Ｂ４５０）、波長５５０ｎｍにおける前記位相差層の面内レターデーションＲｅ（Ｂ５５０）、及び、波長６５０ｎｍにおける前記位相差層の面内レターデーションＲｅ（Ｂ６５０）が、下記式（５）及び（６）：
０．７５＜Ｒｅ（Ｂ４５０）／Ｒｅ（Ｂ５５０）＜１．００ （５）
１．０１＜Ｒｅ（Ｂ６５０）／Ｒｅ（Ｂ５５０）＜１．２５ （６）
を満たす、〔７〕記載の光学異方性積層体。
〔１２〕 前記位相差層が、配向状態が固定されていてもよい、化合物２を含み、前記化合物２は、式（ＩＩａ）で表される化合物、式（ＩＩｂ）で表される化合物、又はこれらの混合物である、〔９〕又は〔１１〕記載の光学異方性積層体：

但し、
Ｇ^ａは、置換基を有していてもよい炭素数１～３０の２価の有機基を表し、
Ｙ^ａは、化学的な単結合、－Ｏ－、－Ｃ（＝Ｏ）－、－Ｃ（＝Ｏ）－Ｏ－、－Ｏ－Ｃ（＝Ｏ）－、－Ｏ－Ｃ（＝Ｏ）－Ｏ－、－Ｃ（＝Ｏ）－Ｓ－、－Ｓ－Ｃ（＝Ｏ）－、－ＮＲ^１１－Ｃ（＝Ｏ）－、－Ｃ（＝Ｏ）－ＮＲ^１１－、－Ｏ－Ｃ（＝Ｏ）－ＮＲ^１１－、－ＮＲ^１１－Ｃ（＝Ｏ）－Ｏ－、－Ｓ－、－Ｎ＝Ｎ－、または、－Ｃ≡Ｃ－を表し、Ｒ^１１は、炭素数１～６のアルキル基を表し、
Ｆｘ^１およびＦｘ^２は、それぞれ独立して、芳香族炭化水素環および芳香族複素環の少なくとも一方を有する有機基を表し、
Ｑは、水素原子、または、置換基を有していてもよい炭素数１～６のアルキル基を表し、
Ｒ^Ｉ～Ｒ^ＩＶは、それぞれ独立して、水素原子；ハロゲン原子；炭素数１～６のアルキル基；シアノ基；ニトロ基；炭素数１～６のハロゲン化アルキル基；炭素数１～６のアルコキシ基；－ＯＣＦ_３；－Ｃ（＝Ｏ）－Ｏ－Ｒ^ａ；または、－Ｏ－Ｃ（＝Ｏ）－Ｒ^ａを表し、Ｒ^ａは、置換基を有していてもよい炭素数１～２０のアルキル基、置換基を有していてもよい炭素数２～２０のアルケニル基、置換基を有していてもよい炭素数３～１２のシクロアルキル基、または、置換基を有していてもよい炭素数６～１２の芳香族炭化水素環基を表し、
Ｒ^０は、ハロゲン原子；炭素数１～６のアルキル基；シアノ基；ニトロ基；炭素数１～６のハロゲン化アルキル基；炭素数１～６のアルコキシ基；－ＯＣＦ_３；－Ｃ（＝Ｏ）－Ｏ－Ｒ^ａ；または－Ｏ－Ｃ（＝Ｏ）－Ｒ^ａを表し、
ｐは０～３の整数を表し、
ｐ１は０～４の整数を表し、
ｐ２は０または１を表し、
Ｙ^１～Ｙ⁸は、それぞれ独立して、化学的な単結合、－Ｏ－、－Ｏ－ＣＨ_２－、－ＣＨ_２－Ｏ－、－Ｏ－ＣＨ_２－ＣＨ_２－、－ＣＨ_２－ＣＨ_２－Ｏ－、－Ｃ（＝Ｏ）－Ｏ－、－Ｏ－Ｃ（＝Ｏ）－、－Ｏ－Ｃ（＝Ｏ）－Ｏ－、－Ｃ（＝Ｏ）－Ｓ－、－Ｓ－Ｃ（＝Ｏ）－、－ＮＲ^１３－Ｃ（＝Ｏ）－、－Ｃ（＝Ｏ）－ＮＲ^１３－、－ＣＦ_２－Ｏ－、－Ｏ－ＣＦ_２－、－ＣＨ_２－ＣＨ_２－、－ＣＦ_２－ＣＦ_２－、－Ｏ－ＣＨ_２－ＣＨ_２－Ｏ－、－ＣＨ＝ＣＨ－Ｃ（＝Ｏ）－Ｏ－、－Ｏ－Ｃ（＝Ｏ）－ＣＨ＝ＣＨ－、－ＣＨ_２－Ｃ（＝Ｏ）－Ｏ－、－Ｏ－Ｃ（＝Ｏ）－ＣＨ_２－、－ＣＨ_２－Ｏ－Ｃ（＝Ｏ）－、－Ｃ（＝Ｏ）－Ｏ－ＣＨ_２－、－ＣＨ_２－ＣＨ_２－Ｃ（＝Ｏ）－Ｏ－、－Ｏ－Ｃ（＝Ｏ）－ＣＨ_２－ＣＨ_２－、－ＣＨ_２－ＣＨ_２－Ｏ－Ｃ（＝Ｏ）－、－Ｃ（＝Ｏ）－Ｏ－ＣＨ_２－ＣＨ_２－、－ＣＨ＝ＣＨ－、－Ｎ＝ＣＨ－、－ＣＨ＝Ｎ－、－Ｎ＝Ｃ（ＣＨ_３）－、－Ｃ（ＣＨ_３）＝Ｎ－、－Ｎ＝Ｎ－、または、－Ｃ≡Ｃ－を表し、Ｒ^１３は、水素原子または炭素数１～６のアルキル基を表し、
Ａ^１およびＡ^２並びにＢ^１およびＢ^２は、それぞれ独立して、置換基を有していてもよい環状脂肪族基、または、置換基を有していてもよい芳香族基を表し、
Ｇ^１およびＧ^２は、それぞれ独立して、炭素数１～３０の２価の脂肪族炭化水素基、および、炭素数３～３０の２価の脂肪族炭化水素基に含まれる－ＣＨ_２－の少なくとも一つが、－Ｏ－、－Ｓ－、－Ｏ－Ｃ（＝Ｏ）－、－Ｃ（＝Ｏ）－Ｏ－、－Ｏ－Ｃ（＝Ｏ）－Ｏ－、－ＮＲ^１４－Ｃ（＝Ｏ）－、－Ｃ（＝Ｏ）－ＮＲ^１４－、－ＮＲ^１４－、または、－Ｃ（＝Ｏ）－に置換された基のいずれかの有機基を表し、但し－Ｏ－または－Ｓ－がそれぞれ２以上隣接して介在する場合を除き、Ｒ^１４は、水素原子または炭素数１～６のアルキル基を表し、
Ｐ^１およびＰ^２は、それぞれ独立して、置換基を有していてもよい炭素数２～１０のアルケニル基を表し、
ｎおよびｍは、それぞれ独立して、０または１である。
〔１３〕 波長５９０ｎｍにおける前記位相差層の面内レターデーションＲｅ（Ｂ５９０）、波長５９０ｎｍにおける前記光学異方性層の面内レターデーションＲｅ（Ａ５９０）、及び、波長５９０ｎｍにおける前記光学異方性層の厚み方向のレターデーションＲｔｈ（Ａ５９０）が、下記式（７）、（８）及び（９）：
１１０ｎｍ≦Ｒｅ（Ｂ５９０）≦１７０ｎｍ （７）
Ｒｅ（Ａ５９０）≦１０ｎｍ （８）
－１１０ｎｍ≦Ｒｔｈ（Ａ５９０）≦－２０ｎｍ （９）
を満たす、〔７〕～〔１２〕のいずれか一項に記載の光学異方性積層体。
〔１４〕 直線偏光子と、
〔１〕～〔５〕のいずれか一項に記載の光学異方性層、〔６〕記載の光学異方性転写体、又は、〔７〕～〔１３〕のいずれか一項に記載の光学異方性積層体と、を備える、偏光板。
〔１５〕 〔１４〕記載の偏光板を備える、画像表示装置。
〔１６〕 〔７〕～〔１３〕のいずれか一項に記載の光学異方性積層体と、
直線偏光子と、
画像表示素子と、を、この順に備え、
前記画像表示素子が、液晶セル又は有機エレクトロルミネッセンス素子である、画像表示装置。
〔１７〕 直線偏光子と、
〔７〕～〔１３〕のいずれか一項に記載の光学異方性積層体と、
有機エレクトロルミネッセンス素子と、を、この順に備える、画像表示装置。
〔１８〕 重合体、化合物１及び溶媒を含む塗工液を、支持面上に塗工して、塗工液層を得る工程と、
前記塗工液層を乾燥させる工程と、を含む、光学異方性層の製造方法であって、
前記重合体は、前記重合体の溶液を用いた塗工法により前記重合体の膜を形成した場合に、前記膜の面内方向であって最大の屈折率を与える方向の屈折率ｎｘ（Ｐ）、前記膜の前記面内方向であって前記ｎｘ（Ｐ）の方向に垂直な方向の屈折率ｎｙ（Ｐ）、及び、前記膜の厚み方向の屈折率ｎｚ（Ｐ）が、ｎｚ（Ｐ）＞ｎｘ（Ｐ）≧ｎｙ（Ｐ）を満たすものであり、
前記光学異方性層の面内方向であって最大の屈折率を与える方向の屈折率ｎｘ（Ａ）、前記光学異方性層の前記面内方向であって前記ｎｘ（Ａ）の方向に垂直な方向の屈折率ｎｙ（Ａ）、及び、前記光学異方性層の厚み方向の屈折率ｎｚ（Ａ）が、ｎｚ（Ａ）＞ｎｘ（Ａ）≧ｎｙ（Ａ）を満たし、
波長４５０ｎｍにおける前記光学異方性層の厚み方向のレターデーションＲｔｈ（Ａ４５０）、波長５５０ｎｍにおける前記光学異方性層の厚み方向のレターデーションＲｔｈ（Ａ５５０）、及び、波長６５０ｎｍにおける前記光学異方性層の厚み方向のレターデーションＲｔｈ（Ａ６５０）が、下記式（１）及び（２）：
０．５０＜Ｒｔｈ（Ａ４５０）／Ｒｔｈ（Ａ５５０）＜１．００ （１）
１．００≦Ｒｔｈ（Ａ６５０）／Ｒｔｈ（Ａ５５０）＜１．２５ （２）
を満たし、前記化合物１は、式（Ｉａ）で表される化合物、式（Ｉｂ）で表される化合物、又はこれらの混合物である、光学異方性層の製造方法：

但し、
Ｇ^ａは、置換基を有していてもよい炭素数１～３０の２価の有機基を表し、
Ｙ^ａは、化学的な単結合、－Ｏ－、－Ｃ（＝Ｏ）－、－Ｃ（＝Ｏ）－Ｏ－、－Ｏ－Ｃ（＝Ｏ）－、－Ｏ－Ｃ（＝Ｏ）－Ｏ－、－Ｃ（＝Ｏ）－Ｓ－、－Ｓ－Ｃ（＝Ｏ）－、－ＮＲ^１１－Ｃ（＝Ｏ）－、－Ｃ（＝Ｏ）－ＮＲ^１１－、－Ｏ－Ｃ（＝Ｏ）－ＮＲ^１１－、－ＮＲ^１１－Ｃ（＝Ｏ）－Ｏ－、－Ｓ－、－Ｎ＝Ｎ－、または、－Ｃ≡Ｃ－を表し、Ｒ^１１は、炭素数１～６のアルキル基を表し、
Ｆｘ^１およびＦｘ^２は、それぞれ独立して、芳香族炭化水素環および芳香族複素環の少なくとも一方を有する有機基を表し、
Ｑは、水素原子、または、置換基を有していてもよい炭素数１～６のアルキル基を表し、
Ｒ^Ｉ～Ｒ^ＩＶは、それぞれ独立して、水素原子；ハロゲン原子；炭素数１～６のアルキル基；シアノ基；ニトロ基；炭素数１～６のハロゲン化アルキル基；炭素数１～６のアルコキシ基；－ＯＣＦ_３；－Ｃ（＝Ｏ）－Ｏ－Ｒ^ａ；または、－Ｏ－Ｃ（＝Ｏ）－Ｒ^ａを表し、Ｒ^ａは、置換基を有していてもよい炭素数１～２０のアルキル基、置換基を有していてもよい炭素数２～２０のアルケニル基、置換基を有していてもよい炭素数３～１２のシクロアルキル基、または、置換基を有していてもよい炭素数６～１２の芳香族炭化水素環基を表し、
Ｒ^０は、ハロゲン原子；炭素数１～６のアルキル基；シアノ基；ニトロ基；炭素数１～６のハロゲン化アルキル基；炭素数１～６のアルコキシ基；－ＯＣＦ_３；－Ｃ（＝Ｏ）－Ｏ－Ｒ^ａ；または－Ｏ－Ｃ（＝Ｏ）－Ｒ^ａを表し、
ｐは０～３の整数を表し、
ｐ１は０～４の整数を表し、
ｐ２は０または１を表し、
Ｙ^１～Ｙ⁸は、それぞれ独立して、化学的な単結合、－Ｏ－、－Ｏ－ＣＨ_２－、－ＣＨ_２－Ｏ－、－Ｏ－ＣＨ_２－ＣＨ_２－、－ＣＨ_２－ＣＨ_２－Ｏ－、－Ｃ（＝Ｏ）－Ｏ－、－Ｏ－Ｃ（＝Ｏ）－、－Ｏ－Ｃ（＝Ｏ）－Ｏ－、－Ｃ（＝Ｏ）－Ｓ－、－Ｓ－Ｃ（＝Ｏ）－、－ＮＲ^１３－Ｃ（＝Ｏ）－、－Ｃ（＝Ｏ）－ＮＲ^１３－、－ＣＦ_２－Ｏ－、－Ｏ－ＣＦ_２－、－ＣＨ_２－ＣＨ_２－、－ＣＦ_２－ＣＦ_２－、－Ｏ－ＣＨ_２－ＣＨ_２－Ｏ－、－ＣＨ＝ＣＨ－Ｃ（＝Ｏ）－Ｏ－、－Ｏ－Ｃ（＝Ｏ）－ＣＨ＝ＣＨ－、－ＣＨ_２－Ｃ（＝Ｏ）－Ｏ－、－Ｏ－Ｃ（＝Ｏ）－ＣＨ_２－、－ＣＨ_２－Ｏ－Ｃ（＝Ｏ）－、－Ｃ（＝Ｏ）－Ｏ－ＣＨ_２－、－ＣＨ_２－ＣＨ_２－Ｃ（＝Ｏ）－Ｏ－、－Ｏ－Ｃ（＝Ｏ）－ＣＨ_２－ＣＨ_２－、－ＣＨ_２－ＣＨ_２－Ｏ－Ｃ（＝Ｏ）－、－Ｃ（＝Ｏ）－Ｏ－ＣＨ_２－ＣＨ_２－、－ＣＨ＝ＣＨ－、－Ｎ＝ＣＨ－、－ＣＨ＝Ｎ－、－Ｎ＝Ｃ（ＣＨ_３）－、－Ｃ（ＣＨ_３）＝Ｎ－、－Ｎ＝Ｎ－、または、－Ｃ≡Ｃ－を表し、Ｒ^１３は、水素原子または炭素数１～６のアルキル基を表し、
Ａ^１およびＡ^２並びにＢ^１およびＢ^２は、それぞれ独立して、置換基を有していてもよい環状脂肪族基、または、置換基を有していてもよい芳香族基を表し、
Ｇ^１およびＧ^２は、それぞれ独立して、炭素数１～３０の２価の脂肪族炭化水素基、および、炭素数３～３０の２価の脂肪族炭化水素基に含まれる－ＣＨ_２－の少なくとも一つが、－Ｏ－、－Ｓ－、－Ｏ－Ｃ（＝Ｏ）－、－Ｃ（＝Ｏ）－Ｏ－、－Ｏ－Ｃ（＝Ｏ）－Ｏ－、－ＮＲ^１４－Ｃ（＝Ｏ）－、－Ｃ（＝Ｏ）－ＮＲ^１４－、－ＮＲ^１４－、または、－Ｃ（＝Ｏ）－に置換された基のいずれかの有機基を表し、但し－Ｏ－または－Ｓ－がそれぞれ２以上隣接して介在する場合を除き、Ｒ^１４は、水素原子または炭素数１～６のアルキル基を表し、
Ｐ^１およびＰ^２は、それぞれ独立して、置換基を有していてもよい炭素数２～１０のアルケニル基を表し、
ｎおよびｍは、それぞれ独立して、０または１である。
〔１９〕 〔６〕記載の光学異方性転写体の光学異方性層と、位相差層とを、貼り合わせる工程と、
前記光学異方性転写体の基材を剥離する工程と、を含む、光学異方性積層体の製造方法であって、
前記位相差層の面内方向であって最大の屈折率を与える方向の屈折率ｎｘ（Ｂ）、前記位相差層の前記面内方向であって前記ｎｘ（Ｂ）の方向に垂直な方向の屈折率ｎｙ（Ｂ）、及び、前記位相差層の厚み方向の屈折率ｎｚ（Ｂ）が、ｎｘ（Ｂ）＞ｎｙ（Ｂ）≧ｎｚ（Ｂ）を満たす、光学異方性積層体の製造方法。The present invention is as follows.
[1] An optically anisotropic layer containing a polymer and a compound 1 whose orientation state may be fixed,
When the polymer film is formed by a coating method using a solution of the polymer, the polymer has a refractive index nx(P) in a direction that is an in-plane direction of the film and provides a maximum refractive index. , the refractive index ny(P) in the in-plane direction of the film and in the direction perpendicular to the nx(P) direction, and the refractive index nz(P) in the thickness direction of the film are nz(P) >nx(P)≧ny(P),
a refractive index nx(A) in the in-plane direction of the optically anisotropic layer and in the direction giving the maximum refractive index; the refractive index ny(A) in the perpendicular direction and the refractive index nz(A) in the thickness direction of the optically anisotropic layer satisfy nz(A)>nx(A)≧ny(A);
The thickness direction retardation Rth (A450) of the optically anisotropic layer at a wavelength of 450 nm, the thickness direction retardation Rth (A550) of the optically anisotropic layer at a wavelength of 550 nm, and the optical anisotropy at a wavelength of 650 nm The thickness direction retardation Rth (A650) of the layer is represented by the following formulas (1) and (2):
0.50<Rth(A450)/Rth(A550)<1.00 (1)
1.00≦Rth(A650)/Rth(A550)<1.25 (2)
wherein the compound 1 is a compound represented by Formula (Ia), a compound represented by Formula (Ib), or a mixture thereof, an optically anisotropic layer:

however,
Ga represents ^a divalent organic group having 1 to 30 carbon atoms which may have a substituent,
Y ^a is a chemical single bond, -O-, -C(=O)-, -C(=O)-O-, -OC(=O)-, -OC(=O) -O-, -C(=O)-S-, -S-C(=O)-, -NR ¹¹ -C(=O)-, -C(=O)-NR ¹¹ -, -O-C (=O)-NR ¹¹ -, -NR ¹¹ -C(=O)-O-, -S-, -N=N-, or -C≡C-, where R ¹¹ has 1 to 1 carbon atoms represents an alkyl group of 6,
Fx ¹ and Fx ² each independently represent an organic group having at least one of an aromatic hydrocarbon ring and an aromatic heterocyclic ring;
Q represents a hydrogen atom or an optionally substituted alkyl group having 1 to 6 carbon atoms,
R ^I to R ^IV each independently represents a hydrogen atom; a halogen atom; an alkyl group having 1 to 6 carbon atoms; a cyano group; a nitro group; a halogenated alkyl group having 1 to 6 carbon atoms; Alkoxy group; —OCF ₃ ; —C(=O)—OR ^a ; or —OC(=O)—R ^a , where R ^a is the number of carbon atoms which may have a substituent 1 to 20 alkyl groups, optionally substituted C 2 to 20 alkenyl groups, optionally substituted C 3 to 12 cycloalkyl groups, or substituted represents an aromatic hydrocarbon ring group having 6 to 12 carbon atoms which may be
R ⁰ is a halogen atom; an alkyl group having 1 to 6 carbon atoms; a cyano group; a nitro group; a halogenated alkyl group having ₁ to 6 carbon atoms; O)—O—R ^a ; or —O—C(=O)—R ^a ,
p represents an integer of 0 to 3,
p1 represents an integer from 0 to 4,
p2 represents 0 or 1,
Y ¹ to Y ⁸ are each independently a chemical single bond, -O-, -O-CH ₂ -, -CH ₂ -O-, -O-CH ₂ -CH ₂ -, -CH ₂ - CH ₂ -O-, -C(=O)-O-, -OC(=O)-, -OC(=O)-O-, -C(=O)-S-, -S -C(=O)-, -NR ¹³ -C(=O)-, -C(=O)-NR ¹³ -, -CF ₂ -O-, -O-CF ₂ -, -CH ₂ -CH ₂ -, -CF ₂ -CF ₂ -, -O-CH ₂ -CH ₂ -O-, -CH=CH-C(=O)-O-, -O-C(=O)-CH=CH-, -CH ₂ -C(=O)-O-, -OC(=O)-CH ₂ -, -CH ₂ -O-C(=O)-, -C(=O)-O-CH ₂ -, -CH ₂ -CH ₂ -C(=O)-O-, -OC(=O)-CH ₂ -CH ₂ -, -CH ₂ -CH ₂ -OC(=O)-, -C(=O)-O-CH ₂ -CH ₂ -, -CH=CH-, -N=CH-, -CH=N-, -N=C(CH ₃ )-, -C(CH ₃ ) =N-, -N=N-, or -C≡C-, R ¹³ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms,
A ¹ and A ² and B ¹ and B ² each independently represent an optionally substituted cyclic aliphatic group or an optionally substituted aromatic group,
G ¹ and G ² are each independently a divalent aliphatic hydrocarbon group having 1 to 30 carbon atoms and a —CH ₂ — included in a divalent aliphatic hydrocarbon group having 3 to 30 carbon atoms. at least one of -O-, -S-, -OC(=O)-, -C(=O)-O-, -OC(=O)-O-, -NR ¹⁴ -C (=O)-, -C(=O)-NR ¹⁴ -, -NR ¹⁴ -, or an organic group substituted with -C(=O)-, with the proviso that -O- or R ¹⁴ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, except when two or more -S- are interposed adjacently,
P ¹ and P ² each independently represent an optionally substituted alkenyl group having 2 to 10 carbon atoms,
n and m are each independently 0 or 1;
[2] The optically anisotropic layer of [1], wherein the compound 1 is represented by any one of the following formulas (B1) to (B5).

[3] The optically anisotropic layer of [1] or [2], wherein the polymer is at least one polymer selected from the group consisting of polyvinylcarbazole, polyfumarate and cellulose derivatives.
[4] The optically anisotropic layer according to any one of [1] to [3], wherein the ratio of the compound 1 in the total solid content of the optically anisotropic layer is 40% by weight to 70% by weight. layer.
[5] The in-plane retardation Re (A590) of the optically anisotropic layer at a wavelength of 590 nm and the thickness direction retardation Rth (A590) of the optically anisotropic layer at a wavelength of 590 nm are represented by the following formula (3) and (4):
Re(A590)≦10 nm (3)
-200 nm ≤ Rth (A590) ≤ -10 nm (4)
The optically anisotropic layer according to any one of [1] to [4], which satisfies
[6] An optically anisotropic transfer member comprising a substrate and the optically anisotropic layer of any one of [1] to [5].
[7] comprising the optically anisotropic layer according to any one of [1] to [5] and a retardation layer;
Refractive index nx(B) in the in-plane direction of the retardation layer in the direction giving the maximum refractive index, and in the in-plane direction of the retardation layer in the direction perpendicular to the nx(B) direction An optically anisotropic laminate in which the refractive index ny(B) and the refractive index nz(B) in the thickness direction of the retardation layer satisfy nx(B)>ny(B)≧nz(B).
[8] The optically anisotropic laminate according to [7], wherein the retardation layer is a stretched film layer containing an alicyclic structure-containing polymer.
[9] The optically anisotropic laminate according to [8], wherein the retardation layer is an obliquely stretched film layer.
[10] The optically anisotropic laminate according to any one of [7] to [9], wherein the retardation layer is a stretched film layer having a multilayer structure.
[11] In-plane retardation Re (B450) of the retardation layer at a wavelength of 450 nm, in-plane retardation Re (B550) of the retardation layer at a wavelength of 550 nm, and in-plane retardation of the retardation layer at a wavelength of 650 nm Dation Re (B650) is represented by the following formulas (5) and (6):
0.75<Re(B450)/Re(B550)<1.00 (5)
1.01<Re(B650)/Re(B550)<1.25 (6)
The optically anisotropic laminate according to [7], which satisfies
[12] The retardation layer contains a compound 2 whose orientation state may be fixed, and the compound 2 is a compound represented by formula (IIa), a compound represented by formula (IIb), or The optically anisotropic laminate according to [9] or [11], which is a mixture of these:

however,
Ga represents ^a divalent organic group having 1 to 30 carbon atoms which may have a substituent,
Y ^a is a chemical single bond, -O-, -C(=O)-, -C(=O)-O-, -OC(=O)-, -OC(=O) -O-, -C(=O)-S-, -S-C(=O)-, -NR ¹¹ -C(=O)-, -C(=O)-NR ¹¹ -, -O-C (=O)-NR ¹¹ -, -NR ¹¹ -C(=O)-O-, -S-, -N=N-, or -C≡C-, where R ¹¹ has 1 to 1 carbon atoms represents an alkyl group of 6,
Fx ¹ and Fx ² each independently represent an organic group having at least one of an aromatic hydrocarbon ring and an aromatic heterocyclic ring;
Q represents a hydrogen atom or an optionally substituted alkyl group having 1 to 6 carbon atoms,
R ^I to R ^IV each independently represents a hydrogen atom; a halogen atom; an alkyl group having 1 to 6 carbon atoms; a cyano group; a nitro group; a halogenated alkyl group having 1 to 6 carbon atoms; Alkoxy group; —OCF ₃ ; —C(=O)—OR ^a ; or —OC(=O)—R ^a , where R ^a is the number of carbon atoms which may have a substituent 1 to 20 alkyl groups, optionally substituted C 2 to 20 alkenyl groups, optionally substituted C 3 to 12 cycloalkyl groups, or substituted represents an aromatic hydrocarbon ring group having 6 to 12 carbon atoms which may be
R ⁰ is a halogen atom; an alkyl group having 1 to 6 carbon atoms; a cyano group; a nitro group; a halogenated alkyl group having ₁ to 6 carbon atoms; O)—O—R ^a ; or —O—C(=O)—R ^a ,
p represents an integer of 0 to 3,
p1 represents an integer from 0 to 4,
p2 represents 0 or 1,
Y ¹ to Y ⁸ are each independently a chemical single bond, -O-, -O-CH ₂ -, -CH ₂ -O-, -O-CH ₂ -CH ₂ -, -CH ₂ - CH ₂ -O-, -C(=O)-O-, -OC(=O)-, -OC(=O)-O-, -C(=O)-S-, -S -C(=O)-, -NR ¹³ -C(=O)-, -C(=O)-NR ¹³ -, -CF ₂ -O-, -O-CF ₂ -, -CH ₂ -CH ₂ -, -CF ₂ -CF ₂ -, -O-CH ₂ -CH ₂ -O-, -CH=CH-C(=O)-O-, -O-C(=O)-CH=CH-, -CH ₂ -C(=O)-O-, -OC(=O)-CH ₂ -, -CH ₂ -O-C(=O)-, -C(=O)-O-CH ₂ -, -CH ₂ -CH ₂ -C(=O)-O-, -OC(=O)-CH ₂ -CH ₂ -, -CH ₂ -CH ₂ -OC(=O)-, -C(=O)-O-CH ₂ -CH ₂ -, -CH=CH-, -N=CH-, -CH=N-, -N=C(CH ₃ )-, -C(CH ₃ ) =N-, -N=N-, or -C≡C-, R ¹³ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms,
A ¹ and A ² and B ¹ and B ² each independently represent an optionally substituted cyclic aliphatic group or an optionally substituted aromatic group,
G ¹ and G ² are each independently a divalent aliphatic hydrocarbon group having 1 to 30 carbon atoms and a —CH ₂ — included in a divalent aliphatic hydrocarbon group having 3 to 30 carbon atoms. at least one of -O-, -S-, -OC(=O)-, -C(=O)-O-, -OC(=O)-O-, -NR ¹⁴ -C (=O)-, -C(=O)-NR ¹⁴ -, -NR ¹⁴ -, or an organic group substituted with -C(=O)-, with the proviso that -O- or R ¹⁴ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, except when two or more -S- are interposed adjacently,
P ¹ and P ² each independently represent an optionally substituted alkenyl group having 2 to 10 carbon atoms,
n and m are each independently 0 or 1;
[13] In-plane retardation Re (B590) of the retardation layer at a wavelength of 590 nm, in-plane retardation Re (A590) of the optically anisotropic layer at a wavelength of 590 nm, and the optically anisotropic layer at a wavelength of 590 nm The thickness direction retardation Rth (A590) of the following formulas (7), (8) and (9):
110nm≦Re(B590)≦170nm (7)
Re(A590)≦10 nm (8)
-110 nm ≤ Rth (A590) ≤ -20 nm (9)
The optically anisotropic laminate according to any one of [7] to [12], which satisfies
[14] a linear polarizer;
The optically anisotropic layer according to any one of [1] to [5], the optically anisotropic transfer member according to [6], or the optically anisotropic transfer member according to any one of [7] to [13]. and an optically anisotropic laminate.
[15] An image display device comprising the polarizing plate of [14].
[16] the optically anisotropic laminate according to any one of [7] to [13];
a linear polarizer;
and an image display element, provided in this order,
An image display device, wherein the image display element is a liquid crystal cell or an organic electroluminescence element.
[17] a linear polarizer;
the optically anisotropic laminate according to any one of [7] to [13];
and an organic electroluminescence element in this order.
[18] a step of applying a coating liquid containing a polymer, compound 1 and a solvent onto a support surface to obtain a coating liquid layer;
A method for producing an optically anisotropic layer, comprising a step of drying the coating liquid layer,
When the polymer film is formed by a coating method using a solution of the polymer, the polymer has a refractive index nx(P) in a direction that is an in-plane direction of the film and provides a maximum refractive index. , the refractive index ny(P) in the in-plane direction of the film and in the direction perpendicular to the nx(P) direction, and the refractive index nz(P) in the thickness direction of the film are nz(P) >nx(P)≧ny(P),
a refractive index nx(A) in the in-plane direction of the optically anisotropic layer and in the direction giving the maximum refractive index; the refractive index ny(A) in the perpendicular direction and the refractive index nz(A) in the thickness direction of the optically anisotropic layer satisfy nz(A)>nx(A)≧ny(A);
The thickness direction retardation Rth (A450) of the optically anisotropic layer at a wavelength of 450 nm, the thickness direction retardation Rth (A550) of the optically anisotropic layer at a wavelength of 550 nm, and the optical anisotropy at a wavelength of 650 nm The thickness direction retardation Rth (A650) of the layer is represented by the following formulas (1) and (2):
0.50<Rth(A450)/Rth(A550)<1.00 (1)
1.00≦Rth(A650)/Rth(A550)<1.25 (2)
and the compound 1 is a compound represented by formula (Ia), a compound represented by formula (Ib), or a mixture thereof:

however,
Ga represents ^a divalent organic group having 1 to 30 carbon atoms which may have a substituent,
Y ^a is a chemical single bond, -O-, -C(=O)-, -C(=O)-O-, -OC(=O)-, -OC(=O) -O-, -C(=O)-S-, -S-C(=O)-, -NR ¹¹ -C(=O)-, -C(=O)-NR ¹¹ -, -O-C (=O)-NR ¹¹ -, -NR ¹¹ -C(=O)-O-, -S-, -N=N-, or -C≡C-, where R ¹¹ has 1 to 1 carbon atoms represents an alkyl group of 6,
Fx ¹ and Fx ² each independently represent an organic group having at least one of an aromatic hydrocarbon ring and an aromatic heterocyclic ring;
Q represents a hydrogen atom or an optionally substituted alkyl group having 1 to 6 carbon atoms,
R ^I to R ^IV each independently represents a hydrogen atom; a halogen atom; an alkyl group having 1 to 6 carbon atoms; a cyano group; a nitro group; a halogenated alkyl group having 1 to 6 carbon atoms; Alkoxy group; —OCF ₃ ; —C(=O)—OR ^a ; or —OC(=O)—R ^a , where R ^a is the number of carbon atoms which may have a substituent 1 to 20 alkyl groups, optionally substituted C 2 to 20 alkenyl groups, optionally substituted C 3 to 12 cycloalkyl groups, or substituted represents an aromatic hydrocarbon ring group having 6 to 12 carbon atoms which may be
R ⁰ is a halogen atom; an alkyl group having 1 to 6 carbon atoms; a cyano group; a nitro group; a halogenated alkyl group having ₁ to 6 carbon atoms; O)—O—R ^a ; or —O—C(=O)—R ^a ,
p represents an integer of 0 to 3,
p1 represents an integer from 0 to 4,
p2 represents 0 or 1,
Y ¹ to Y ⁸ are each independently a chemical single bond, -O-, -O-CH ₂ -, -CH ₂ -O-, -O-CH ₂ -CH ₂ -, -CH ₂ - CH ₂ -O-, -C(=O)-O-, -OC(=O)-, -OC(=O)-O-, -C(=O)-S-, -S -C(=O)-, -NR ¹³ -C(=O)-, -C(=O)-NR ¹³ -, -CF ₂ -O-, -O-CF ₂ -, -CH ₂ -CH ₂ -, -CF ₂ -CF ₂ -, -O-CH ₂ -CH ₂ -O-, -CH=CH-C(=O)-O-, -O-C(=O)-CH=CH-, -CH ₂ -C(=O)-O-, -OC(=O)-CH ₂ -, -CH ₂ -O-C(=O)-, -C(=O)-O-CH ₂ -, -CH ₂ -CH ₂ -C(=O)-O-, -OC(=O)-CH ₂ -CH ₂ -, -CH ₂ -CH ₂ -OC(=O)-, -C(=O)-O-CH ₂ -CH ₂ -, -CH=CH-, -N=CH-, -CH=N-, -N=C(CH ₃ )-, -C(CH ₃ ) =N-, -N=N-, or -C≡C-, R ¹³ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms,
A ¹ and A ² and B ¹ and B ² each independently represent an optionally substituted cyclic aliphatic group or an optionally substituted aromatic group,
G ¹ and G ² are each independently a divalent aliphatic hydrocarbon group having 1 to 30 carbon atoms and a —CH ₂ — included in a divalent aliphatic hydrocarbon group having 3 to 30 carbon atoms. at least one of -O-, -S-, -OC(=O)-, -C(=O)-O-, -OC(=O)-O-, -NR ¹⁴ -C (=O)-, -C(=O)-NR ¹⁴ -, -NR ¹⁴ -, or an organic group substituted with -C(=O)-, with the proviso that -O- or R ¹⁴ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, except when two or more -S- are interposed adjacently,
P ¹ and P ² each independently represent an optionally substituted alkenyl group having 2 to 10 carbon atoms,
n and m are each independently 0 or 1;
[19] a step of laminating the optically anisotropic layer of the optically anisotropic transfer member described in [6] and a retardation layer;
A method for producing an optically anisotropic laminate, comprising:
Refractive index nx(B) in the in-plane direction of the retardation layer in the direction giving the maximum refractive index, and in the in-plane direction of the retardation layer in the direction perpendicular to the nx(B) direction Manufacturing an optically anisotropic laminate in which the refractive index ny(B) and the refractive index nz(B) in the thickness direction of the retardation layer satisfy nx(B)>ny(B)≧nz(B) Method.

According to the present invention, an optically anisotropic layer which can be produced without using an alignment film and which can be used as a positive C plate exhibiting reverse wavelength dispersion in retardation Rth in the thickness direction, and a method for producing the same; An optically anisotropic laminate having an anisotropic layer, a method for producing the same, and an optically anisotropic transfer member, a polarizing plate, and an image display device having the optically anisotropic layer can be provided.

FIG. 1 is a cross-sectional view schematically showing an organic EL display device as an image display device according to the first embodiment of the invention. FIG. 2 is a cross-sectional view schematically showing an organic EL display device as an image display device according to the second embodiment of the invention. FIG. 3 is a cross-sectional view schematically showing a liquid crystal display device as an image display device according to the third embodiment of the invention.

Hereinafter, the present invention will be described in detail by showing embodiments and examples. However, the present invention is not limited to the embodiments and examples shown below, and can be arbitrarily modified without departing from the scope of the claims of the present invention and their equivalents.

In the following description, unless otherwise specified, the front direction of a certain surface means the normal direction of the surface, specifically the direction of the surface with a polar angle of 0° and an azimuth angle of 0°.

In the following description, the direction of inclination of a certain surface means a direction neither parallel nor perpendicular to the surface, unless otherwise specified. pointing in the direction of

In the following description, unless otherwise specified, the in-plane retardation Re of a certain layer represents a value represented by Re=(nx−ny)×d, and the retardation Rth in the thickness direction of a certain layer is , Rth=[{(nx+ny)/2}−nz]×d. Here, nx is the in-plane direction of the layer and represents the refractive index in the direction giving the maximum refractive index, and ny is the in-plane direction of the layer and represents the refractive index in the direction orthogonal to the nx direction. , nz represents the refractive index in the thickness direction of the layer, and d represents the thickness of the layer. Further, the in-plane direction indicates a direction perpendicular to the thickness direction.

In the following description, unless otherwise specified, the refractive index measurement wavelength is 590 nm.

In the following description, the term "long" refers to a length that is usually 5 times or more, preferably 10 times or more, of the width. It is long enough to be rolled up and stored or transported. Although the upper limit of the ratio of length to width is not particularly limited, it can be, for example, 100,000 times or less.

In the following description, the terms "polarizing plate" and "wavelength plate" include not only rigid members but also flexible members such as resin films.

In the following description, unless otherwise specified, "(meth)acryl" is a term including "acryl", "methacryl" and combinations thereof.

In the following description, the directions of the elements being "parallel" and "perpendicular" may include errors within a range that does not impair the effects of the present invention, for example, within a range of ±5°, unless otherwise specified. .

In the following description, a resin having a positive intrinsic birefringence value means a resin in which the refractive index in the drawing direction is higher than the refractive index in the direction perpendicular to it. A resin having a negative intrinsic birefringence value means a resin whose refractive index in the stretching direction is smaller than that in the direction perpendicular to the stretching direction. Intrinsic birefringence values can be calculated from the dielectric constant distribution.

[1. Optically anisotropic layer]
The optically anisotropic layer of the present invention contains a prescribed polymer and a prescribed compound 1, and has prescribed optical properties. The polymer contained in the optically anisotropic layer may be hereinafter referred to as a "positive C polymer".

[1.1. Positive C polymer]
When a positive C polymer film is formed by a coating method using a solution of the positive C polymer, the positive C polymer has refractive indices nx(P), ny(P) and nz(P) of the film. is a polymer that satisfies nz(P)>nx(P)≧ny(P). Here, nx(P) is the in-plane direction of the film and represents the refractive index in the direction giving the maximum refractive index, and ny(P) is the in-plane direction of the film and the nx( nz(P) represents the refractive index in the direction perpendicular to the direction of P), and nz(P) represents the refractive index in the thickness direction of the film. By using such a positive C polymer in combination with compound 1, optical anisotropy used as a positive C plate exhibiting reverse wavelength dispersion in retardation Rth in the thickness direction, which can be produced without using an alignment film. can realize the sexual layer.

Whether or not a certain polymer corresponds to a positive C polymer can be confirmed by the following method.
First, a polymer as a sample is added to a solvent such as methyl ethyl ketone (MEK), 1,3-dioxolane, N-methylpyrrolidone (NMP) so that the concentration of the polymer is 10% by weight to 20% by weight, Dissolve at room temperature to obtain a polymer solution.
This polymer solution is applied onto an unstretched resin film using an applicator to form a layer of the polymer solution. Then, it is dried in an oven at 85° C. for about 10 minutes to evaporate the solvent, thereby obtaining a polymer film having a thickness of about 10 μm.
Then, the refractive index nx(P), the refractive index ny(P), and the refractive index nz(P) of this polymer film are evaluated as to whether they satisfy nz(P)>nx(P)≧ny(P). If the above conditions are satisfied, the polymer as the sample can be judged to be a positive C polymer.

Above all, it is preferable that the refractive index nx(P) and the refractive index ny(P) have the same value or are close to each other. Specifically, the difference nx(P)-ny(P) between the refractive index nx(P) and the refractive index ny(P) is preferably 0.00000 to 0.00100, more preferably 0.00000 to 0.00000. 00050, particularly preferably 0.00000 to 0.00020. When the refractive index difference nx(P)-ny(P) is within the above range, the optically anisotropic layer of the invention can be easily obtained.

Any polymer having a refractive index that satisfies the above formula nz(P)>nx(P)≧ny(P) can be used as the positive C polymer. Among them, the positive C polymer is preferably at least one polymer selected from the group consisting of polyvinylcarbazole, polyfumarate and cellulose derivatives. By using these polymers as the positive C polymer, an optically anisotropic layer having a large retardation Rth in the thickness direction can be easily obtained by coating.

Specific examples of the positive C polymer include poly(9-vinylcarbazole); copolymer of diisopropyl fumarate and 3-ethyl-3-oxetanylmethyl acrylate; copolymer of diisopropyl fumarate and cinnamate. union; and the like.
Moreover, positive C polymer may be used individually by 1 type, and may be used in combination of 2 or more types by arbitrary ratios.

The ratio of the positive C polymer in the total solid content of the optically anisotropic layer is preferably 30% by weight or more, more preferably 35% by weight or more, still more preferably 40% by weight or more, and preferably 60% by weight or less. It is more preferably 55% by weight or less, still more preferably 50% by weight or less. When the ratio of the positive C polymer is at least the lower limit of the above range, the compound 1 can be uniformly dispersed in the optically anisotropic layer, and the mechanical strength of the optically anisotropic layer can be increased. Further, when it is equal to or less than the upper limit of the above range, the wavelength dispersion of the retardation Rth in the thickness direction of the optically anisotropic layer can be easily approximated to the reverse dispersion. Here, the solid content of a certain layer refers to the components remaining when the layer is dried.

[1.2. Compound 1]
Compound 1 is a compound represented by Formula (Ia), a compound having a structure represented by Formula (Ib), or a mixture thereof.

In formulas (Ia) and (Ib), Ga represents ^a divalent organic group having 1 to 30 carbon atoms which may have a substituent, and 3 to 3 carbon atoms which may have a substituent. It is preferably a 30 divalent organic group.

Examples of substituents of the divalent organic group of G ^a include alkyl groups having 1 to 5 carbon atoms such as methyl group, ethyl group and propyl group; alkoxy groups of up to 5; cyano groups; and halogen atoms such as fluorine atoms and chlorine atoms.

Preferred examples of G ^a include the following G ^a -1 to G ^a -2.
G ^a -1: a divalent aliphatic hydrocarbon group having 1 to 30 carbon atoms which may have a substituent.
G ^a -2: at least one of —CH ₂ — contained in the optionally substituted C 3-30 divalent aliphatic hydrocarbon group is —O—, —S—, —O -C(=O)-, -C(=O)-O-, -OC(=O)-O-, -NR ¹² -C(=O)-, -C(=O)-NR ¹² -, -NR ¹² -, or a group substituted with -C(=O)-. However, G ^a -2 excludes two or more -O- and two or more -S-. R ¹² represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.
Regarding Ga, the "divalent aliphatic hydrocarbon group" is preferably ^a divalent chain aliphatic hydrocarbon group, more preferably an alkylene group.

Here, when G ^a has 3 or more carbon atoms, both ends of G ^a are preferably —CH ₂ — (both ends of G ^a are not substituted). Also, in G ^a -2, —O— and —S— do not replace consecutive —CH ₂ — in the aliphatic hydrocarbon group (i.e., structures of —O—O— and —S—S— not formed) (that is, it is preferable to exclude the case where two or more of each -O- or -S- are interposed adjacently). In G ^a -2, -C(=O)- does not replace consecutive -CH ₂ - in the aliphatic hydrocarbon group (i.e., -C(=O)-C(=O)- structure) is preferred.

Examples of substituents possessed by the ^divalent aliphatic hydrocarbon group of Ga include alkyl groups having 1 to 5 carbon atoms such as methyl group, ethyl group and propyl group; methoxy group, ethoxy group and isopropoxy group. 1 to 5 alkoxy groups; cyano groups; and halogen atoms such as fluorine and chlorine atoms.

In formulas (Ia) and (Ib), Y ^a is a chemical single bond, -O-, -C(=O)-, -C(=O)-O-, -OC(=O) -, -O-C(=O)-O-, -C(=O)-S-, -S-C(=O)-, -NR ¹¹ -C(=O)-, -C(=O ) -NR ¹¹ -, -O-C(=O)-NR ¹¹ -, -NR ¹¹ -C(=O)-O-, -S-, -N=N-, or -C≡C- show. Here, R ¹¹ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms such as methyl, ethyl and propyl. Among them, -O-, -C(=O)-O-, and -OC(=O)- are preferred, and -O- and -OC(=O)-* are particularly preferred. Here, ^* represents the position that binds to ^FX1 or FX2.

In formulas (Ia) and (Ib), Fx ¹ and Fx ² each independently represent an organic group having at least one of an aromatic hydrocarbon ring and an aromatic heterocyclic ring.

Here, each of the number of carbon atoms in the organic group of Fx ¹ and the number of carbon atoms in the organic group of Fx ² is preferably 2 or more and 30 or less, preferably 7 or more, and further preferably 8 or more. It is preferably 10 or more, and particularly preferably 10 or more.
The above-mentioned "carbon number" of the organic group having at least one of the aromatic hydrocarbon ring and the aromatic heterocyclic ring of Fx ¹ and Fx ² is the aromatic hydrocarbon ring and It means the carbon number of the organic group itself having at least one aromatic heterocyclic ring (the number of carbon atoms including the number of carbon atoms composing the aromatic hydrocarbon ring and the aromatic heterocyclic ring of the organic group).
The number of carbon atoms in Fx ¹ as a whole (that is, the number of carbon atoms in Fx ¹ , including the number of carbon atoms in the substituents of Fx ¹ ) is preferably 4 or more, while it is preferably 38 or less, more preferably 20 or less. be. ^The total carbon number of Fx2 is preferably 3 or more, while it is preferably 38 or less, more preferably 20 or less.

The organic group of Fx ¹ and Fx ² is an alkyl group having 1 to 18 carbon atoms in which at least one hydrogen atom is substituted with a ring-containing group having at least one of an aromatic hydrocarbon ring and an aromatic heterocyclic ring, or an aromatic A cyclic group having 2 to 20 carbon atoms and having at least one of a hydrocarbon ring and an aromatic heterocyclic ring is preferred. The alkyl group having 1 to 18 carbon atoms substituted with a ring-containing group may have a substituent other than the ring-containing group, and the cyclic group having 2 to 20 carbon atoms also has a substituent. may be When the alkyl group having 1 to 18 carbon atoms and the cyclic group having 2 to 20 carbon atoms substituted with a ring-containing group have a plurality of substituents, the plurality of substituents may be the same or different. Also, when Fx ¹ and Fx ² have multiple aromatic hydrocarbon rings and/or multiple aromatic heterocycles, they may be the same or different.

Here, specific examples of the aromatic hydrocarbon ring of the ring-containing group and the cyclic group include aromatic hydrocarbon rings having 6 to 30 carbon atoms such as benzene ring, naphthalene ring, anthracene ring, phenanthrene ring, pyrene ring, and fluorene ring. A hydrogen ring is mentioned.

Further, specific examples of the aromatic heterocycles of the above ring-containing groups and cyclic groups include 1H-isoindole-1,3(2H)-dione ring, 1-benzofuran ring, 2-benzofuran ring, acridine ring and isoquinoline ring. , imidazole ring, indole ring, oxadiazole ring, oxazole ring, oxazolopyrazine ring, oxazolopyridine ring, oxazolopyridazyl ring, oxazolopyrimidine ring, quinazoline ring, quinoxaline ring, quinoline ring, cinnoline ring, thiadiazole ring, thiazole ring, thiazolopyrazine ring, thiazolopyridine ring, thiazolopyridazine ring, thiazolopyrimidine ring, thiophene ring, triazine ring, triazole ring, naphthyridine ring, pyrazine ring, pyrazole ring, pyranone ring, pyran ring, pyridine ring, pyridazine ring, pyrimidine ring, pyrrole ring, phenanthridine ring, phthalazine ring, furan ring, benzo[c]thiophene ring, benzoisoxazole ring, benzisothiazole ring, benzimidazole ring, benzoxadiazole ring, benzo C2-C30 aromatic heterocycles such as oxazole ring, benzothiadiazole ring, benzothiazole ring, benzothiophene ring, benzotriazine ring, benzotriazole ring, benzopyrazole ring, and benzopyranone ring.

Here, examples of the substituents of the alkyl group having 1 to 18 carbon atoms and the cyclic group having 2 to 20 carbon atoms substituted with a ring-containing group include halogen atoms such as a fluorine atom and a chlorine atom; a cyano group; a methyl group; , C1-6 alkyl groups such as ethyl group and propyl group; C2-6 alkenyl groups such as vinyl group and allyl group; C1-6 groups such as trifluoromethyl group and pentafluoroethyl group halogenated alkyl group; N,N-dialkylamino group having 2 to 12 carbon atoms such as dimethylamino group; alkoxy group having 1 to 6 carbon atoms such as methoxy group _, ethoxy group and isopropoxy group; nitro group; -C(=O)-R ^a ; -C(=O)-OR ^a ; -OC(=O)-R ^a and the like. R ^a is an optionally substituted alkyl group having 1 to 20 carbon atoms, an optionally substituted alkenyl group having 2 to 20 carbon atoms, It represents a cycloalkyl group having 3 to 12 carbon atoms which may be substituted, or an aromatic hydrocarbon ring group having 6 to 12 carbon atoms which may have a substituent.
Fx ¹ and Fx ² may have multiple substituents selected from the substituents described above. When Fx ¹ and Fx ² have multiple substituents, the substituents may be the same or different.

Specific examples of the alkyl group having 1 to 18 carbon atoms in the alkyl group having 1 to 18 carbon atoms substituted with a ring-containing group include a methyl group, an ethyl group, a propyl group and an isopropyl group.

The aromatic hydrocarbon ring and/or aromatic heterocyclic ring of the ring-containing group may be directly bonded to a carbon atom of an alkyl group having 1 to 18 carbon atoms, or -S-, -O-, -C (=O)-, -C(=O)-O-, -OC(=O)-, -OC(=O)-O-, -C(=O)-S-, -S -C(=O)-, -NR ¹¹ -C(=O)-, -C(=O)-NR ¹¹ or other linking group to a carbon atom of an alkyl group having 1 to 18 carbon atoms; may Here, R ¹¹ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms such as methyl, ethyl and propyl.
That is, the ring-containing group may be an optionally substituted aromatic hydrocarbon ring group and/or an optionally substituted aromatic heterocyclic group, or an optionally substituted linking group and/or a group comprising an optionally substituted aromatic heterocyclic ring having a linking group.

Here, examples of aromatic hydrocarbon ring groups, which are specific examples of the ring-containing groups described above, include phenyl group, naphthyl group, anthracenyl group, phenanthrenyl group, pyrenyl group, and fluorenyl group.

Examples of aromatic heterocyclic groups that are specific examples of the ring-containing groups described above include a phthalimido group, a 1-benzofuranyl group, a 2-benzofuranyl group, an acridinyl group, an isoquinolinyl group, an imidazolyl group, an indolinyl group, a furazanyl group, oxazolyl group, oxazolopyrazinyl group, oxazolopyridinyl group, oxazolopyridazinyl group, oxazolopyrimidinyl group, quinazolinyl group, quinoxalinyl group, quinolyl group, cinnolinyl group, thiadiazolyl group, thiazolyl group, thiazolo pyrazinyl group, thiazolopyridyl group, thiazolopyridazinyl group, thiazolopyrimidinyl group, thienyl group, triazinyl group, triazolyl group, naphthyridinyl group, pyrazinyl group, pyrazolyl group, pyranonyl group, pyranyl group, pyridyl group, pyridazinyl group, pyrimidinyl group, pyrrolyl group, phenanthridinyl group, phthalazinyl group, furanyl group, benzo[c]thienyl group, benzoisoxazolyl group, benzoisothiazolyl group, benzimidazolyl group, benzoxadiazolyl group, benzoxazolyl group, benzothiadiazolyl group, benzothiazolyl group, benzothienyl group, benzotriazinyl group, benzotriazolyl group, benzopyrazolyl group, benzopyranonyl group and the like.

Furthermore, specific examples of the ring-containing group include a group comprising an aromatic hydrocarbon ring having a linking group and/or a group comprising an aromatic heterocyclic ring having a linking group, such as a phenylthio group, a naphthylthio group, an anthraceni luthio group, phenanthrenylthio group, pyrenylthio group, fluorenylthio group, phenyloxy group, naphthyloxy group, anthracenyloxy group, phenanthrenyloxy group, pyrenyloxy group, fluorenyloxy group, benzisoxazolylthio benzoisothiazolylthio group, benzoxadiazolylthio group, benzoxazolylthio group, benzothiadiazolylthio group, benzothiazolylthio group, benzothienylthio group, benzoisoxazolyloxy group, benzoisothiazolylthio group Examples include an azolyloxy group, a benzoxadiazolyloxy group, a benzoxazolyloxy group, a benzothiadiazolyloxy group, a benzothiazolyloxy group, and a benzothienyloxy group.

Then, the substituent that the "aromatic hydrocarbon ring group" of the ring-containing group may have, the substituent that the "aromatic heterocyclic group" of the ring-containing group may have, and the ring-containing group "having a linking group Substituents that the group consisting of an aromatic hydrocarbon ring and the "group consisting of an aromatic heterocyclic ring having a linking group" may have are those having 1 to 18 carbon atoms substituted with the ring-containing groups Fx ¹ and Fx ² above. and the same substituents that the alkyl group of and the cyclic group having 2 to 20 carbon atoms can have.

Preferable specific examples of the "alkyl group having 1 to 18 carbon atoms in which at least one hydrogen atom is substituted with a ring-containing group having at least one of an aromatic hydrocarbon ring and an aromatic heterocyclic ring" include the following formula (1- Structures represented by 1) to (1-10) are exemplified. However, the present invention is not limited to those shown below. In the formula below, "*" represents ^a bond with Ya extending from an arbitrary position on the ring. The groups represented by formulas (1-1) to (1-10) below may have the substituents described above.

Examples of the "cyclic group having 2 to 20 carbon atoms and having at least one of an aromatic hydrocarbon ring and an aromatic heterocyclic ring" include:
1) a hydrocarbon ring group having 6 to 20 carbon atoms having at least one aromatic hydrocarbon ring having 6 to 18 carbon atoms, and 2) an aromatic hydrocarbon ring having 6 to 18 carbon atoms and a a heterocyclic group having 2 to 20 carbon atoms and having at least one aromatic ring selected from the group consisting of aromatic heterocycles;
is mentioned. These groups may have the substituents described above.

In the present invention, the "aromatic ring" is a cyclic structure having a broadly defined aromaticity according to Huckel's rule, i.e., a cyclic conjugated structure having (4n+2) π electrons, and thiophene, furan, benzothiazole, and the like. It means a cyclic structure in which lone electron pairs of heteroatoms such as sulfur, oxygen, and nitrogen participate in a π-electron system and exhibit aromaticity.

Examples of the hydrocarbon ring group of 1) above include aromatic hydrocarbon ring groups having 6 to 18 carbon atoms (phenyl group (6 carbon atoms), naphthyl group (10 carbon atoms), anthracenyl group (14 carbon atoms), phenanthrenyl group (14 carbon atoms), pyrenyl group (16 carbon atoms), fluorenyl group (13 carbon atoms), etc.), indanyl group (9 carbon atoms), 1,2,3,4-tetrahydronaphthyl group (10 carbon atoms) , 1,4-dihydronaphthyl group (10 carbon atoms) and the like.

Specific examples of the hydrocarbon ring group of 1) include structures represented by the following formulas (2-1) to (2-21). The groups represented by formulas (2-1) to (2-21) below may have the substituents described above.

Examples of the heterocyclic group of 2) above include aromatic heterocyclic groups having 2 to 18 carbon atoms (phthalimide group, 1-benzofuranyl group, 2-benzofuranyl group, acridinyl group, isoquinolinyl group, imidazolyl group, indolinyl group, furazanyl group, oxazolyl group, oxazolopyrazinyl group, oxazolopyridinyl group, oxazolopyridazinyl group, oxazolopyrimidinyl group, quinazolinyl group, quinoxalinyl group, quinolyl group, cinnolinyl group, thiadiazolyl group, thiazolyl group, thiazolopyrazinyl group, thiazolopyridinyl group, thiazolopyridazinyl group, thiazolopyrimidinyl group, thienyl group, triazinyl group, triazolyl group, napthyridinyl group, pyrazinyl group, pyrazolyl group, pyranonyl group, pyranyl group , pyridyl group, pyridazinyl group, pyrimidinyl group, pyrrolyl group, phenanthridinyl group, phthalazinyl group, furanyl group, benzo[c]thienyl group, benzoisoxazolyl group, benzoisothiazolyl group, benzimidazolyl group, benzoxa zolyl group, benzothiadiazolyl group, benzothiazolyl group, benzothiophenyl group, benzotriazinyl group, benzotriazolyl group, benzopyrazolyl group, benzopyranonyl group, etc.), xanthenyl group, 2,3- dihydroindolyl group, 9,10-dihydroacridinyl group, 1,2,3,4-tetrahydroquinolyl group, dihydropyranyl group, tetrahydropyranyl group, dihydrofuranyl group, tetrahydrofuranyl group, etc. mentioned.

Specific examples of the heterocyclic group of 2) include structures represented by the following formulas (3-1) to (3-51). The groups represented by formulas (3-1) to (3-51) below may have the substituents described above.

[In each formula, X represents -CH ₂ -, -NR ^c -, an oxygen atom, a sulfur atom, -SO- or -SO ₂ -,
Y and Z each independently represent —NR ^c —, an oxygen atom, a sulfur atom, —SO— or —SO ₂ —;
E represents -NR ^c -, an oxygen atom or a sulfur atom.
Here, ^Rc represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms such as a methyl group, an ethyl group and a propyl group. (However, in each formula, an oxygen atom, a sulfur atom, —SO—, and —SO ₂ — shall not be adjacent to each other.)]

The total number of π electrons contained in the ring structure in Fx ¹ is preferably 8 or more, more preferably 10 or more, preferably 20 or less, and more preferably 18 or less.
Further, the total number of π electrons contained in the ring structure in Fx ² is preferably 4 or more, more preferably 6 or more, preferably 20 or less, and more preferably 18 or less. .

Fx ¹ is preferably any one of the following formulas (i-1) to (i-9), and Fx ² is any one of the following formulas (i-1) to (i-11) is preferred. The groups represented by formulas (i-1) to (i-11) below may have the substituents described above.

[In formula, Y represents the same meaning as the above. ]

Furthermore, in formulas (Ia) and (Ib), Q represents a hydrogen atom or an optionally substituted alkyl group having 1 to 6 carbon atoms. Here, examples of the alkyl group having 1 to 6 carbon atoms in the alkyl group having 1 to 6 carbon atoms which may have a substituent include a methyl group, an ethyl group, a propyl group and an isopropyl group. Examples include aromatic hydrocarbon ring groups having 6 to 12 carbon atoms such as phenyl group and naphthalene group. Among them, Q is preferably a hydrogen atom or an unsubstituted alkyl group having 1 to 6 carbon atoms, and particularly preferably a hydrogen atom, a methyl group, an ethyl group, a propyl group or a butyl group.

In formulas (Ia) and (Ib), R ^I to R ^IV each independently represent a hydrogen atom; a halogen atom such as a fluorine atom or a chlorine atom; cyano group; nitro group; halogenated alkyl group having 1 to 6 carbon atoms such as trifluoromethyl group and pentafluoroethyl group; -OCF ₃ ; -C(=O)-OR ^a ; or -OC(=O)-R ^a . In addition, ^Ra has the same meaning as above, and its preferred examples are also the same as above.
R ^I to R ^IV may all be the same or different, and at least one C—R ^I to C—R ^IV constituting a ring may be replaced with a nitrogen atom. Specific examples of groups in which at least one of C—R ^I to C—R ^IV is replaced with a nitrogen atom are shown below. However, the group in which at least one of C--R ^I to C--R ^IV is replaced with a nitrogen atom is not limited to these.

Furthermore, in formulas (Ia) and (Ib), R ⁰ is a halogen atom such as a chlorine atom and a fluorine atom; an alkyl group having 1 to 6 carbon atoms such as a methyl group, an ethyl group and a propyl group; a cyano group; a nitro group halogenated alkyl groups having 1 to 6 carbon atoms such as trifluoromethyl group and pentafluoroethyl group; alkoxy groups having 1 to 6 carbon atoms such as methoxy group, ethoxy group and propoxy group; -OCF ₃ ; -C(= O)—O—R ^a ; or —O—C(=O)—R ^a . Here, ^Ra has the same meaning as above, and its preferred examples are also the same as above. When there are multiple R ⁰ s, the multiple R ^0s may be the same or different.

In formulas (Ia) and (Ib), p represents an integer of 0-3, p1 represents an integer of 0-4, and p2 represents 0 or 1. Preferably, p, p1 and p2 are all 0.

In formulas (Ia) and (Ib), Y ¹ to Y ⁸ each independently represent a chemical single bond, —O—, —O—CH ₂ —, —CH ₂ —O—, —O -CH ₂ -CH ₂ -, -CH ₂ -CH ₂ -O-, -C(=O)-O-, -OC(=O)-, -OC(=O)-O-, -C(=O)-S-, -S-C(=O)-, -NR ¹³ -C(=O)-, -C(=O)-NR ¹³ -, -CF ₂ -O-,- O-CF ₂ -, -CH ₂ -CH ₂ -, -CF ₂ -CF ₂ -, -O-CH ₂ -CH ₂ -O-, -CH=CH-C(=O)-O-, -O -C(=O)-CH=CH-, -CH ₂ -C(=O)-O-, -OC(=O)-CH ₂ -, -CH ₂ -OC(=O)- , -C(=O)-O-CH ₂ -, -CH ₂ -CH ₂ -C(=O)-O-, -O-C(=O)-CH ₂ -CH ₂ -, -CH ₂ - CH ₂ -O-C(=O)-, -C(=O)-O-CH ₂ -CH ₂ -, -CH=CH-, -N=CH-, -CH=N-, -N=C (CH ₃ )—, —C(CH ₃ )=N—, —N=N—, or —C≡C—. Here, R ¹³ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms such as methyl, ethyl and propyl.

Furthermore, in formulas (Ia) and (Ib), A ¹ and A ² and B ¹ and B ² are each independently an optionally substituted cyclic aliphatic group or a substituted represents an aromatic group that may be A ¹ and A ² and B ¹ and B ² are each independently an optionally substituted cyclic aliphatic group having 5 to 20 carbon atoms, or A good aromatic group having 2 to 20 carbon atoms is preferred.

Here, specific examples of the cyclic aliphatic groups for A ¹ and A ² and B ¹ and B ² include cyclopentane-1,3-diyl group, cyclohexane-1,4-diyl group, cycloheptane-1,4 cycloalkanediyl groups having 5 to 20 carbon atoms such as -diyl group and cyclooctane-1,5-diyl group; carbon atoms such as decahydronaphthalene-1,5-diyl group and decahydronaphthalene-2,6-diyl group Bicycloalkanediyl groups of numbers 5 to 20 and the like can be mentioned. Among them, a cyclohexane-1,4-diyl group is preferred. The cycloaliphatic group may be trans, cis, or a mixture of cis and trans, preferably trans.

Specific examples of aromatic groups for A ¹ and A ² and B ¹ and B ² include 1,2-phenylene group, 1,3-phenylene group, 1,4-phenylene group and 1,4-naphthylene group. , a 1,5-naphthylene group, a 2,6-naphthylene group, a 4,4′-biphenylene group and other aromatic hydrocarbon ring groups having 6 to 20 carbon atoms; furan-2,5-diyl group, thiophene-2, aromatic heterocyclic groups having 2 to 20 carbon atoms such as 5-diyl group, pyridine-2,5-diyl group and pyrazine-2,5-diyl group; Among them, a 1,4-phenylene group and a 2,6-naphthylene group are preferred, and a 1,4-phenylene group is particularly preferred.

The combination of (A ¹ and A ² ) and (B ¹ and B ² ) when n and m are 1 is a cycloaliphatic group for A ¹ and A ² and an aromatic group for B ¹ and B ² A combination in which A ¹ and A ² are cyclohexane-1,4-diyl groups and B ¹ and B ² are 1,4-phenylene groups is more preferred, and A ¹ and A ² are Particularly preferred is a trans(cyclohexane-1,4-diyl) group in which B ¹ and B ² are 1,4-phenylene groups.

Examples of substituents of the cyclic aliphatic groups and aromatic groups of A ¹ and A ² and B ¹ and B ² include halogen atoms such as fluorine and chlorine atoms; carbon numbers such as methyl, ethyl and propyl groups; 1-6 alkyl groups; alkoxy groups having 1-5 carbon atoms such as methoxy, ethoxy and isopropoxy groups; nitro groups; cyano groups and the like. The cycloaliphatic group and the aromatic group may have at least one substituent selected from the substituents described above. When the cycloaliphatic group and the aromatic group have a plurality of substituents, each substituent may be the same or different.

In formulas (Ia) and (Ib), G ¹ and G ² each independently represent a divalent aliphatic hydrocarbon group having 1 to 30 carbon atoms and a divalent aliphatic hydrocarbon group having 3 to 30 carbon atoms. At least one of -CH ₂ - contained in the aliphatic hydrocarbon group is -O-, -S-, -O-C(=O)-, -C(=O)-O-, -O-C( =O)-O-, -NR ¹⁴ -C(=O)-, -C(=O)-NR ¹⁴ -, -NR ¹⁴ -, or a group substituted with -C(=O)- represents an organic group. However, cases where two or more -O- or -S- are adjacently interposed are excluded. Here, R ¹⁴ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms such as methyl, ethyl and propyl.

When G ¹ and G ² each independently have 3 or more carbon atoms, both ends of G ¹ and G ² are —CH ₂ — (both ends of G ¹ and G ² are unsubstituted ) is preferred.

Further, "at least one of -CH ₂ - contained in the divalent aliphatic hydrocarbon group having 3 to 30 carbon atoms is -O-, -S-, -OC(=O)-, -C( =O)-O-, -O-C(=O)-O-, -NR ¹⁴ -C(=O)-, -C(=O)-NR ¹⁴ -, -NR ¹⁴ -, or -C In "(=O)-substituted group", -O- and -S- do not replace consecutive -CH ₂ - in an aliphatic hydrocarbon group (i.e., -O-O- and -S- S- structure is not formed) (that is, it is preferable to exclude the case where two or more -O- or -S- are adjacently interposed), -C (= O) - is an aliphatic carbonization It is preferred not to replace consecutive —CH ₂ — in the hydrogen group (ie not to form a —C(═O)—C(═O)— structure). R ¹⁴ is the same as above.

G ¹ and G ² are each independently included in (i) “a divalent aliphatic hydrocarbon group having 1 to 18 carbon atoms and a divalent aliphatic hydrocarbon group having 3 to 18 carbon atoms at least one of -CH ₂ - is -O-, -S-, -OC(=O)-, -C(=O)-O-, -OC(=O)-O-, - NR ¹⁴ -C(=O)-, -C(=O)-NR ¹⁴ -, -NR ¹⁴ -, or -C(=O)- (preferably -O-, -S-, -O- C(=O)-, -C(=O)-O-, or any organic group substituted with -C(=O)-)", and (ii) "substituted It is more preferably an alkylene group having 1 to 18 carbon atoms which may have a group. R ¹⁴ is the same as above.

Hydrogen atoms contained in the organic groups of G ¹ and G ² are alkyl groups having 1 to 5 carbon atoms such as methyl group, ethyl group and propyl group; an alkoxy group of; a cyano group; or a halogen atom such as a fluorine atom or a chlorine atom.

Substituents for the alkylene group having 1 to 18 carbon atoms in G ¹ and G ² include alkyl groups having 1 to 5 carbon atoms such as methyl group, ethyl group and propyl group; methoxy group, ethoxy group, propoxy group and the like. an alkoxy group having 1 to 5 carbon atoms; a cyano group; or a halogen atom such as a fluorine atom or a chlorine atom.

Furthermore, in formulas (Ia) and (Ib), P ¹ and P ² each independently represent an optionally substituted alkenyl group having 2 to 10 carbon atoms.
Here, examples of substituents that the alkenyl groups having 2 to 10 carbon atoms of P ¹ and P ² may have include halogen atoms such as a fluorine atom and a chlorine atom, and alkyl groups such as a methyl group and an ethyl group. . Among these substituents, a chlorine atom or a methyl group is preferred.
In addition, the alkenyl group having 2 to 10 carbon atoms of the alkenyl group having 2 to 10 carbon atoms which may have a substituent includes a vinyl group, a propenyl group, an isopropenyl group, a butenyl group, an isobutenyl group, a pentenyl group, hexenyl group, heptenyl group, octenyl group, nonenyl group, decenyl group and the like. Among them, a vinyl group is preferred.

In formulas (Ia) and (Ib), n and m are each independently 0 or 1, with 1 being more preferred.
When both n and m are 1, B ¹ and B ² in formulas (Ia) and (Ib) above are each independently a cyclic aliphatic group optionally having a substituent. and more preferably a cycloaliphatic group having 5 to 20 carbon atoms which may have a substituent.

The polymerizable liquid crystal compound described above can be synthesized by combining known synthesis reactions. That is, various documents (for example, International Publication No. 2014/10325, International Publication No. 2012/147904, JP 2010-31223, JP 2008-273925, JP 2009-179563), etc. Synthesis can be performed with reference to the described method.

In terms of solid content, the proportion of the polymerizable liquid crystal compound in the polymerizable liquid crystal material is usually 70% by mass or more and less than 100% by mass, and can be, for example, 80% by mass or more and 99% by mass or less.

In the optically anisotropic layer, Compound 1 may have its orientation fixed. For example, compound 1 may have its orientation state fixed by polymerization. Generally, by polymerization, the compound 1 can be polymerized while maintaining the alignment state of the compound 1. Therefore, the alignment state of the compound 1 is fixed by the polymerization. Therefore, the term "compound 1 with a fixed orientation state" includes a polymer of compound 1. Therefore, when compound 1 is a liquid crystal compound having liquid crystallinity, this liquid crystal compound may exhibit a liquid crystal phase in the optically anisotropic layer, and exhibits a liquid crystal phase by fixing the alignment state. It doesn't have to be.

By using Compound 1, it is possible to realize an optically anisotropic layer used as a positive C plate exhibiting reverse wavelength dispersion in retardation Rth in the thickness direction, which can be produced without using an alignment film.

Compound 1 is preferably a photopolymerizable reverse wavelength dispersion liquid crystal compound. The reverse wavelength dispersion liquid crystal compound will be described below.
A reverse wavelength dispersion liquid crystal compound exhibits reverse wavelength dispersion in-plane retardation when homogeneously oriented. Here, the homogeneous alignment of the liquid crystal compound means that a layer containing the liquid crystal compound is formed, and the long axis direction of the mesogenic skeleton of the molecules of the liquid crystal compound in the layer is aligned in a certain direction parallel to the plane of the layer. It means to orient to When the liquid crystal compound contains a plurality of types of mesogen skeletons with different alignment directions, the alignment direction is the direction in which the longest type of mesogen among them is aligned. Whether or not the liquid crystal compound is homogeneously aligned and its alignment direction can be determined by measuring the slow axis direction using a phase difference meter typified by AxoScan (manufactured by Axometrics) and measuring the incident angle in the slow axis direction. It can be confirmed by measuring the retardation distribution for each. The mesogenic skeleton is described in Pure Appl. Chem. 2001, vol.73(5), p.888 and C.I. Tschierske, G.; Pelzl, S. Diele, Angew. Chem. 2004, 116, 6340-6368.

Further, the expression that the in-plane retardation Re exhibits reverse wavelength dispersion means that the in-plane retardations Re(450) and Re(550) at wavelengths of 450 nm and 550 nm satisfy Re(450)/Re(550)<1. It means to fill 00.

Therefore, when a liquid crystal layer containing a reverse wavelength dispersion liquid crystal compound is formed, and the long axis direction of the mesogenic skeleton of the molecules of the liquid crystal compound in the liquid crystal layer is oriented in a certain direction parallel to the plane of the liquid crystal layer. In-plane retardation Re(L450) and Re(L550) of the liquid crystal layer at wavelengths of 450 nm and 550 nm usually satisfy Re(L450)/Re(L550)<1.00.

Furthermore, the in-plane retardation Re (L450), Re (L550), and Re (L650) of the liquid crystal layer at wavelengths of 450 nm, 550 nm, and 650 nm are set to Re It is more preferable to satisfy (L450)<Re(L550)≦Re(L650).

As shown in formulas (Ia) and (Ib), the reverse wavelength dispersion liquid crystal compound has a main chain mesogen skeleton and a side chain mesogen skeleton bonded to the main chain mesogen skeleton in the molecule of the reverse wavelength dispersion liquid crystal compound. and In the reverse wavelength dispersion liquid crystal compound containing a main chain mesogen skeleton and a side chain mesogen skeleton, the side chain mesogen skeleton can be oriented in a direction different from that of the main chain mesogen skeleton when the reverse wavelength dispersion liquid crystal compound is aligned. In such a case, birefringence is expressed as a difference between the refractive index corresponding to the main chain mesogenic skeleton and the refractive index corresponding to the side chain mesogenic skeleton. , can exhibit in-plane retardation of reverse wavelength dispersion.

As shown in formulas (Ia) and (Ib), the reverse wavelength dispersion liquid crystal compound usually has a specific three-dimensional shape different from the three-dimensional shape of general forward wavelength dispersion liquid crystal compounds. Here, the term "normal wavelength dispersion liquid crystal compound" refers to a liquid crystal compound that can exhibit normal wavelength dispersion in-plane retardation when homogeneously aligned. The in-plane retardation of normal wavelength dispersion means an in-plane retardation in which the larger the measured wavelength, the smaller the in-plane retardation. It is speculated that the fact that the reverse wavelength dispersion liquid crystal compound has such a specific three-dimensional shape contributes to the effects of the present invention.

The CN point of compound 1 is preferably 25° C. or higher, more preferably 45° C. or higher, particularly preferably 60° C. or higher, preferably 120° C. or lower, more preferably 110° C. or lower, and particularly preferably 100° C. or lower. . Here, "CN point" refers to the crystal-nematic phase transition temperature. By using Compound 1 having a CN point within the above range, an optically anisotropic layer can be easily produced.

When compound 1 is a monomer, the molecular weight is preferably 300 or more, more preferably 700 or more, particularly preferably 1000 or more, preferably 2000 or less, more preferably 1800 or less, and particularly preferably 1600 or less. be. When compound 1 has the molecular weight as described above, the coatability of the coating liquid for forming the optically anisotropic layer can be particularly improved.

As compound 1, one type of compound may be used alone, or two or more types of compounds may be used in combination at an arbitrary ratio. Specifically, one compound represented by Formula (Ia) or a compound represented by Formula (Ib) may be used alone, or two or more compounds represented by Formula (Ia) may be used in combination. or two or more compounds represented by formula (Ib) may be used in combination, one or more compounds represented by formula (Ia) and one or more compounds represented by formula (Ib) Compounds represented may be used in combination.

The ratio of Compound 1 in the total solid content of the optically anisotropic layer is preferably 40% by weight or more, more preferably 45% by weight or more, still more preferably 50% by weight or more, and more preferably 70% by weight or less. is 65% by weight or less, more preferably 60% by weight or less. When the ratio of the mesogenic compound is at least the lower limit of the above range, the wavelength dispersion of the retardation Rth in the thickness direction of the optically anisotropic layer can easily approach reverse dispersion, and the ratio is at most the upper limit of the range. , the mesogenic compound can be uniformly dispersed in the optically anisotropic layer, and the mechanical strength of the optically anisotropic layer can be increased.

[1.3. optional component]
The optically anisotropic layer may further contain optional components in combination with the positive C polymer and Compound 1.

[1.4. Characteristics of Optically Anisotropic Layer]
The optically anisotropic layer has refractive indices nx(A), ny(A) and nz(A) satisfying nz(A)>nx(A)≧ny(A). Here, nx(A) represents the refractive index in the in-plane direction of the optically anisotropic layer and in the direction giving the maximum refractive index, and ny(A) is the in-plane direction of the optically anisotropic layer. and represents the refractive index in the direction perpendicular to the direction of nx(A), and nz(A) represents the refractive index in the thickness direction of the optically anisotropic layer. An optically anisotropic layer having such refractive indices nx(A), ny(A) and nz(A) can be used as a positive C film. Therefore, when this optically anisotropic layer is incorporated in a circularly polarizing plate and applied to an image display device, reflection of external light is suppressed and light for displaying an image is suppressed in the tilt direction of the display surface of the image display device. It can be made to pass through polarized sunglasses. Furthermore, when the image display device is a liquid crystal display device, the viewing angle can usually be widened. Therefore, when the display surface of the image display device is viewed from an inclined direction, the visibility of the image can be improved.

Above all, it is preferable that the refractive index nx (A) and the refractive index ny (A) of the optically anisotropic layer are the same or close to each other. Specifically, the difference nx(A)-ny(A) between the refractive index nx(A) and the refractive index ny(A) is preferably 0.00000 to 0.00100, more preferably 0.00000 to 0.00000. 00050, particularly preferably 0.00000 to 0.00020. Refractive index difference nx (A) - ny (A) falls within the above range, so that the optical design can be simplified when the optically anisotropic layer is provided in the image display device, and other retardation films It is possible to eliminate the need for adjustment of the bonding direction when bonding with.

The thickness direction retardation Rth (A450) of the optically anisotropic layer at a wavelength of 450 nm, the thickness direction retardation Rth (A550) of the optically anisotropic layer at a wavelength of 550 nm, and the thickness of the optically anisotropic layer at a wavelength of 650 nm. The directional retardation Rth (A650) usually satisfies the following formulas (1) and (2).
0.50<Rth(A450)/Rth(A550)<1.00 (1)
1.00≦Rth(A650)/Rth(A550)<1.25 (2)

To explain the formula (1) in detail, Rth(A450)/Rth(A550) is usually larger than 0.50, preferably larger than 0.60, more preferably larger than 0.70, and usually 1 less than 0.00, preferably less than 0.95, more preferably less than 0.90.

Further, to explain the formula (2) in detail, Rth(A650)/Rth(A550) is usually 1.00 or more, preferably 1.01 or more, and usually less than 1.25, preferably 1.10. is less than

The optically anisotropic layer having thickness direction retardation Rth (A450), Rth (A550) and Rth (A650) satisfying the above formulas (1) and (2) has the opposite thickness direction retardation Rth. Shows chromatic dispersion. Such an optically anisotropic layer exhibiting a retardation Rth in the thickness direction exhibiting reverse wavelength dispersion properties, when incorporated in a circularly polarizing plate and applied to an image display device, exhibits an external The function of suppressing the reflection of light and allowing the light for displaying an image to pass through polarized sunglasses can be exhibited in a wide wavelength range. Furthermore, when the image display device is a liquid crystal display device, the viewing angle can be effectively widened in general. Therefore, the visibility of the image displayed on the display surface can be particularly effectively improved.

According to the study by the present inventors, the mechanism by which the optically anisotropic layer containing a combination of the positive C polymer and the compound 1 can exhibit the optical properties described above is presumed to be as follows. However, the technical scope of the present invention is not limited by the mechanism described below.

In general, the birefringence of a liquid crystal layer containing a liquid crystal compound depends on the alignment state of molecules of the liquid crystal compound in the liquid crystal layer. Therefore, in order to obtain a positive C film, which is a film having a large refractive index in the thickness direction, the molecules of the liquid crystal compound are often oriented in the thickness direction of the liquid crystal layer. When it is desired to align the molecules of the liquid crystal compound in the thickness direction in this way, conventionally, a vertical alignment agent has been used.

When a liquid crystal layer is formed using a vertical alignment agent, a coating liquid containing a liquid crystal compound and a vertical alignment agent is usually prepared, and this coating liquid is applied and dried to obtain a liquid crystal layer. However, since the molecules of the reverse wavelength dispersion liquid crystal compound have a specific three-dimensional shape, even if the liquid crystal layer is formed by the conventional method using a vertical alignment agent, the tilt angle of the molecules of the liquid crystal compound becomes uneven. It was difficult to obtain a good liquid crystal layer. Specifically, in a liquid crystal layer manufactured by a conventional manufacturing method, a plurality of liquid crystal domains are formed as a group of liquid crystal compounds having the same tilt angle. Reflection, refraction, or dispersion of light occurred, resulting in clouding of the liquid crystal layer. Here, the tilt angle refers to the angle formed by the orientation axes of the molecules of the liquid crystal compound with respect to a certain reference plane.

In contrast, the positive C polymer contained in the optically anisotropic layer of the present invention generally contains side chains having a rigid structure such as naphthalene rings and biphenyl groups crossing the main chain. In the optically anisotropic layer containing the positive C polymer, the main chain of the positive C polymer lies parallel to the in-plane direction of the optically anisotropic layer, and the side chains extend in the thickness direction of the optically anisotropic layer. stand. Therefore, when the positive C polymer and the compound 1 are combined, the side chains of the positive C polymer correct the orientation of the compound 1 molecule, so that the long axis direction of the molecule of the compound 1 is optically anisotropic. It is oriented so as to be parallel to the thickness direction of the magnetic layer. Therefore, since a large refractive index appears in the thickness direction of the optically anisotropic layer, the optically anisotropic layer of the present invention exhibits a refractive index capable of functioning as a positive C film.

Furthermore, compound 1 can exhibit in-plane retardation of reverse wavelength dispersion. Therefore, the retardation in the thickness direction of optical anisotropy containing compound 1 whose molecules are oriented in the thickness direction can exhibit reverse wavelength dispersion.
It is believed that such a mechanism enables the optically anisotropic layer of the present invention to exhibit the optical properties described above.

The in-plane retardation Re (A590) of the optically anisotropic layer at a wavelength of 590 nm preferably satisfies the following formula (3).
Re(A590)≦10 nm (3)
To explain the formula (3) in detail, Re(A590) is preferably 0 nm to 10 nm, more preferably 0 nm to 5 nm, and particularly preferably 0 nm to 2 nm. When Re (A590) falls within the above range, the optical design can be simplified when the optically anisotropic layer is provided in an image display device, and lamination with another retardation film can be achieved. No need for direction adjustment.

The thickness direction retardation Rth (A590) of the optically anisotropic layer at a wavelength of 590 nm preferably satisfies the following formula (4).
-200 nm ≤ Rth (A590) ≤ -10 nm (4)
To explain the formula (4) in detail, Rth(A590) is preferably −200 nm or more, more preferably −130 nm or more, particularly preferably −100 nm or more, preferably −10 nm or less, more preferably −30 nm. Below, particularly preferably -50 nm or less. When the optically anisotropic layer having such Rth (A590) is incorporated in a circularly polarizing plate and applied to an image display device, it suppresses reflection of external light in the tilt direction of the display surface of the image display device, It is possible to reduce the color change of reflected light and to allow the light for displaying images to pass through polarized sunglasses. Furthermore, when the image display device is a liquid crystal display device, the viewing angle can usually be widened. Therefore, when the display surface of the image display device is viewed from an inclined direction, the visibility of the image can be improved.

The total light transmittance of the optically anisotropic layer is preferably 80% or higher, more preferably 85% or higher, particularly preferably 90% or higher. Total light transmittance can be measured in the wavelength range of 400 nm to 700 nm using an ultraviolet-visible spectrometer.

The haze of the optically anisotropic layer is preferably 5% or less, more preferably 3% or less, particularly preferably 1% or less, and ideally 0%. Here, haze is measured at 5 points using Nippon Denshoku Industries Co., Ltd.'s "Turbidimeter NDH-300A" in accordance with JIS K7361-1997, and the average value obtained therefrom can be adopted.

The optically anisotropic layer preferably does not exhibit liquid crystallinity. Since the optically anisotropic layer does not exhibit liquid crystallinity, the positive C polymer and the compound 1 can be well dispersed in the optically anisotropic layer. In addition, when the optically anisotropic layer does not have liquid crystallinity, when the optically anisotropic layer is produced using the coating liquid, the orientation unevenness of the compound 1 occurs due to the influence of air fluctuation such as drying air. can be suppressed.

The thickness of the optically anisotropic layer can be appropriately adjusted so as to obtain the desired retardation. A specific thickness of the optically anisotropic layer is preferably 1.0 μm or more, more preferably 3.0 μm or more, and preferably 50 μm or less, more preferably 40 μm or less, and particularly preferably 30 μm or less.

[1.5. Method for producing an optically anisotropic layer]
The optically anisotropic layer is formed by: a step of preparing a coating solution containing a positive C polymer, compound 1 and a solvent; a step of coating this coating solution on a support surface to obtain a coating solution layer; and a step of drying the coating liquid layer.

In the step of preparing the coating liquid, the positive C polymer, compound 1 and solvent are usually mixed to obtain the coating liquid. The ratio of the positive C polymer and Compound 1 in the total solid content of the coating liquid can be adjusted within the same range as the ratio of the positive C polymer and Compound 1 in the total solid content of the optically anisotropic layer.

As the solvent, an organic solvent is usually used. Examples of such organic solvents include hydrocarbon solvents such as cyclopentane and cyclohexane; ketone solvents such as cyclopentanone, cyclohexanone, methyl ethyl ketone, acetone, methyl isobutyl ketone and N-methylpyrrolidone; acetic esters such as butyl acetate and amyl acetate. Solvent; Halogenated hydrocarbon solvent such as chloroform, dichloromethane, dichloroethane; Ether solvent such as 1,4-dioxane, cyclopentyl methyl ether, tetrahydrofuran, tetrahydropyran, 1,3-dioxolane, 1,2-dimethoxyethane; Toluene, xylene , aromatic hydrocarbon solvents such as mesitylene; and mixtures thereof. The boiling point of the solvent is preferably 60° C. to 250° C., more preferably 60° C. to 150° C., from the viewpoint of excellent handleability. Moreover, a solvent may be used individually by 1 type, and may be used in combination of 2 or more types by arbitrary ratios.

The amount of the solvent is preferably adjusted so that the solid content concentration of the coating liquid can be within the desired range. The solid content concentration of the coating liquid is preferably 6% by weight or more, more preferably 8% by weight or more, particularly preferably 10% by weight or more, preferably 20% by weight or less, more preferably 18% by weight or less, especially Preferably, it is 15% by weight or less. An optically anisotropic layer having desired optical properties can be easily formed by setting the solid content concentration of the coating liquid within the above range.

The coating liquid for forming the optically anisotropic layer may contain optional components in combination with the positive C polymer, compound 1 and solvent. Moreover, arbitrary components may be used individually by 1 type, and may be used in combination of 2 or more types by arbitrary ratios.

The coating liquid may contain, for example, a plasticizer as an optional component. Examples of plasticizers include triphenyl phosphate and glyceryl triacetate. One type of plasticizer may be used alone, or two or more types may be used in combination at an arbitrary ratio.

The amount of the plasticizer is preferably 2 parts by weight or more, more preferably 5 parts by weight or more, particularly preferably 8 parts by weight or more, preferably 15 parts by weight or less, and more preferably 100 parts by weight of the positive C polymer. It is preferably 12 parts by weight or less, particularly preferably 10 parts by weight or less. By adjusting the amount of the plasticizer within the above range, embrittlement of the optically anisotropic layer can be suppressed and the mechanical strength can be increased.

The coating liquid may contain, for example, a polymerization initiator as an optional component. The type of polymerization initiator can be appropriately selected according to the type of polymerizable group possessed by the polymerizable compound in the coating liquid. Here, the polymerizable compound is a general term for compounds having polymerizability. Among them, a photopolymerization initiator is preferable. Examples of photopolymerization initiators include radical polymerization initiators, anionic polymerization initiators, cationic polymerization initiators, and the like. Specific examples of commercially available photopolymerization initiators include BASF's trade name: Irgacure907, trade name: Irgacure184, trade name: Irgacure369, trade name: Irgacure651, trade name: Irgacure819, trade name: Irgacure907, trade name : Irgacure379, trade name: Irgacure379EG, trade name: Irgacure OXE02; trade name: ADEKA OPTOMER N1919, and the like. Moreover, one type of the polymerization initiator may be used alone, or two or more types may be used in combination at an arbitrary ratio.

The amount of the polymerization initiator is preferably 0.1 parts by weight or more, more preferably 0.5 parts by weight or more, preferably 30 parts by weight or less, more preferably 10 parts by weight, relative to 100 parts by weight of the polymerizable compound. It is below.

The coating liquid contains, as optional components, metals, metal complexes, dyes, pigments, fluorescent materials, phosphorescent materials, leveling agents, thixotropic agents, gelling agents, polysaccharides, surfactants, ultraviolet absorbers, infrared absorbers, Optional additives such as antioxidants, ion exchange resins, metal oxides such as titanium oxide may be included. The proportion of such optional additives is preferably 0.1 to 20 parts by weight each relative to 100 parts by weight of the positive C polymer.

The coating liquid preferably does not exhibit liquid crystallinity. By using a coating liquid that does not exhibit liquid crystallinity, good dispersion of the positive C polymer and compound 1 can be achieved in the optically anisotropic layer. In addition, by using a coating liquid that does not have liquid crystallinity, it is possible to suppress the occurrence of uneven alignment of compound 1 due to the influence of air fluctuations such as drying air.

After preparing the coating liquid as described above, a step of coating the coating liquid on the support surface to obtain a coating liquid layer is carried out. Any surface that can support the coating liquid layer can be used as the support surface. From the viewpoint of improving the surface condition of the optically anisotropic layer, the support surface is usually a flat surface having no recesses or protrusions. As the support surface, it is preferable to use the surface of a long base material. When using a long base material, it is possible to continuously apply the coating liquid onto the base material that is continuously conveyed. Therefore, by using a long base material, the optically anisotropic layer can be continuously produced, and productivity can be improved.

When coating the coating liquid on the substrate, apply an appropriate tension (usually 100 N / m to 500 N / m) to the substrate to reduce fluttering during transportation of the substrate and apply while maintaining flatness. preferably. The flatness is the amount of deflection in the vertical direction perpendicular to the width direction and the conveying direction of the base material, and is ideally 0 mm, but usually 1 mm or less.

As the substrate, a substrate film is usually used. As the substrate film, a film that can be used as a substrate of an optical laminate can be appropriately selected and used. Among them, from the viewpoint of enabling a multilayer film comprising a base film and an optically anisotropic layer to be used as an optical film and eliminating the need to peel the optically anisotropic layer from the base film, the base film is transparent. films are preferred. Specifically, the total light transmittance of the substrate film is preferably 80% or higher, more preferably 85% or higher, and particularly preferably 88% or higher.

The material of the base film is not particularly limited, and various resins can be used. Examples of resins include resins containing various polymers. Such polymers include alicyclic structure-containing polymers, cellulose esters, polyvinyl alcohol, polyimides, UV-transmitting acrylics, polycarbonates, polysulfones, polyethersulfones, epoxy polymers, polystyrenes, and combinations thereof. Among these, alicyclic structure-containing polymers and cellulose esters are preferred, and alicyclic structure-containing polymers are more preferred, from the viewpoints of transparency, low hygroscopicity, dimensional stability and lightness.

An alicyclic structure-containing polymer is a polymer having an alicyclic structure in a repeating unit, and is usually an amorphous polymer. As the alicyclic structure-containing polymer, both a polymer containing an alicyclic structure in the main chain and a polymer containing an alicyclic structure in the side chain can be used.
The alicyclic structure includes, for example, a cycloalkane structure, a cycloalkene structure, and the like, and a cycloalkane structure is preferable from the viewpoint of thermal stability and the like.
The number of carbon atoms constituting the repeating unit of one alicyclic structure is not particularly limited, but is preferably 4 or more, more preferably 5 or more, particularly preferably 6 or more, preferably 30 or less, and more. The number is preferably 20 or less, particularly preferably 15 or less.

The proportion of repeating units having an alicyclic structure in the alicyclic structure-containing polymer can be appropriately selected depending on the purpose of use. 90% by weight or more. By increasing the number of repeating units having an alicyclic structure as described above, the heat resistance of the substrate film can be enhanced.

Examples of alicyclic structure-containing polymers include (1) norbornene polymers, (2) monocyclic cyclic olefin polymers, (3) cyclic conjugated diene polymers, (4) vinyl alicyclic hydrocarbon polymers, and hydrogenated products thereof. Among these, norbornene polymers are more preferable from the viewpoint of transparency and moldability.

Norbornene polymers include, for example, ring-opening polymers of norbornene monomers, ring-opening copolymers of norbornene monomers and other ring-opening copolymerizable monomers, and hydrogenated products thereof; addition polymers of norbornene monomers; Examples include addition copolymers of norbornene monomers and other copolymerizable monomers. Among these, hydrogenated products of ring-opening polymers of norbornene monomers are particularly preferable from the viewpoint of transparency.

The alicyclic structure-containing polymer is selected from known polymers disclosed in, for example, JP-A-2002-321302.

The glass transition temperature of the alicyclic structure-containing polymer is preferably 80°C or higher, more preferably in the range of 100°C to 250°C. A polymer containing an alicyclic structure having a glass transition temperature within this range is less likely to be deformed and stressed when used at high temperatures, and is excellent in durability.

The weight average molecular weight (Mw) of the alicyclic structure-containing polymer is preferably 10,000 to 100,000, more preferably 25,000 to 80,000, still more preferably 25,000 to 50,000. . When the weight average molecular weight is in this range, the mechanical strength and moldability of the base film are highly balanced, which is preferable. The weight average molecular weight can be measured in terms of polyisoprene by gel permeation chromatography (hereinafter abbreviated as "GPC") using cyclohexane as a solvent. When the resin does not dissolve in cyclohexane, the weight-average molecular weight can be measured by GPC using toluene as a solvent in terms of polystyrene.

The molecular weight distribution (weight average molecular weight (Mw)/number average molecular weight (Mn)) of the alicyclic structure-containing polymer is preferably 1 or more, more preferably 1.2 or more, and preferably 10 or less, more preferably 4 or less, particularly preferably 3.5 or less.

When a resin containing an alicyclic structure-containing polymer is used as the material for the base film, the thickness of the base film is preferably from 1 μm to 1 μm from the viewpoint of improving productivity and facilitating thinning and weight reduction. 1000 μm, more preferably 5 μm to 300 μm, particularly preferably 30 μm to 100 μm.

The resin containing the alicyclic structure-containing polymer may consist only of the alicyclic structure-containing polymer, but may contain any compounding agent as long as the effects of the present invention are not significantly impaired. The proportion of the alicyclic structure-containing polymer in the resin containing the alicyclic structure-containing polymer is preferably 70% by weight or more, more preferably 80% by weight or more.
Preferred specific examples of resins containing alicyclic structure-containing polymers include Zeonor 1420 and Zeonor 1420R manufactured by Zeon Corporation.

Cellulose esters are typically lower fatty acid esters of cellulose (eg, cellulose acetate, cellulose acetate butyrate, and cellulose acetate propionate). A lower fatty acid means a fatty acid having 6 or less carbon atoms per molecule. Cellulose acetate includes triacetyl cellulose (TAC) and cellulose diacetate (DAC).

The acetylation degree of cellulose acetate is preferably 50% to 70%, more preferably 55% to 65%. The weight average molecular weight is preferably 70,000 to 120,000, more preferably 80,000 to 100,000. Moreover, the cellulose acetate may be partially esterified with fatty acid such as propionic acid and butyric acid in addition to acetic acid. Moreover, the resin constituting the base film may include a combination of cellulose acetate and cellulose esters other than cellulose acetate (cellulose propionate, cellulose butyrate, etc.). In that case, it is preferable that all of these cellulose esters satisfy the above acetylation degree.

When a triacetyl cellulose film is used as the base film, the film may be triacetyl cellulose prepared by dissolving triacetyl cellulose in a solvent substantially free of dichloromethane by a low temperature dissolution method or a high temperature dissolution method. A triacetyl cellulose film produced using dope is particularly preferred from the viewpoint of environmental conservation. A film of triacetylcellulose can be made by a co-casting method. In the co-casting method, a solution (dope) containing raw flakes of triacetyl cellulose, a solvent, and optional additives is prepared, and the dope is cast from a dope feeder (die) onto a support. Then, when the cast product is dried to some extent and given rigidity, it is peeled off from the support as a film, and the film is further dried to remove the solvent. Examples of solvents for dissolving raw flakes include halogenated hydrocarbon solvents (dichloromethane, etc.), alcohol solvents (methanol, ethanol, butanol, etc.), ester solvents (methyl formate, methyl acetate, etc.), ether solvents (dioxane, dioxolane, diethyl ether, etc.). Examples of additives contained in the dope include retardation increasing agents, plasticizers, ultraviolet absorbers, deterioration inhibitors, slip agents, release accelerators, and the like. Examples of dope casting supports include horizontal endless metal belts and rotating drums. In casting, a single dope can be cast in a single layer, but a plurality of layers can also be co-cast. When co-casting a plurality of layers, for example, a plurality of dopes can be cast sequentially. An example of a method of drying the film to remove the solvent includes a method of conveying the film and passing it through a drying section whose interior is set to conditions suitable for drying.

Preferred examples of the triacetyl cellulose film include "TAC-TD80U" manufactured by Fuji Photo Film Co., Ltd. and the one disclosed in Technical Bulletin No. 2001-1745 of Japan Institute of Invention and Innovation. The thickness of the triacetyl cellulose film is not particularly limited, but is preferably 20 μm to 150 μm, more preferably 40 μm to 130 μm, even more preferably 70 μm to 120 μm.

Examples of methods for applying the coating liquid include curtain coating, extrusion coating, roll coating, spin coating, dip coating, bar coating, spray coating, slide coating, print coating, and gravure coating. method, die coating method, gap coating method, and dipping method. The thickness of the coating liquid to be applied can be appropriately set according to the desired thickness required for the optically anisotropic layer.

After obtaining a coating liquid layer by coating the coating liquid on the support surface, a step of drying the coating liquid layer is performed. Drying removes the solvent from the coating liquid layer to obtain an optically anisotropic layer. As a drying method, any drying method such as drying by heating, drying under reduced pressure, drying by heating under reduced pressure, and natural drying can be employed.

According to the method for producing an optically anisotropic layer described above, the optically anisotropic layer can be produced by a simple operation of applying a coating liquid containing a combination of the positive C polymer and the compound 1 and drying. Therefore, an alignment film as described in Patent Document 1 is not required. Therefore, the optically anisotropic layer can be easily manufactured because operations such as adjustment of compatibility between the reverse wavelength dispersion liquid crystal and the alignment film and formation of the alignment film are not required.

Furthermore, the coating liquid containing a combination of the positive C polymer and compound 1 can suppress the occurrence of uneven orientation of compound 1 due to the influence of air fluctuations during drying. Therefore, it is possible to easily obtain an optically anisotropic layer having a uniform orientation state over a wide range in the in-plane direction, so that it is easy to obtain an optically anisotropic layer having an excellent surface state. Therefore, it is possible to suppress white turbidity caused by uneven alignment of the optically anisotropic layer.

The method for producing an optically anisotropic layer may further include any steps in addition to the steps described above. For example, the method for producing an optically anisotropic layer may include a step of fixing the alignment state of Compound 1 in the optically anisotropic layer obtained after drying. In this step, the alignment state of compound 1 is usually fixed by polymerizing compound 1 .

For the polymerization of compound 1, a method suitable for the properties of the components contained in the coating liquid, such as the polymerizable compound and the polymerization initiator, can be appropriately selected. For example, a method of irradiating with light is preferable. Here, the irradiated light may include light such as visible light, ultraviolet light, and infrared light. Among them, the method of irradiating ultraviolet rays is preferable because the operation is simple. The UV irradiation intensity is preferably in the range of 0.1 mW/cm ² to 1000 mW/cm ² , more preferably in the range of 0.5 mW/cm ² to 600 mW/cm ² . The ultraviolet irradiation time is preferably in the range of 1 second to 300 seconds, more preferably in the range of 5 seconds to 100 seconds. The cumulative amount of ultraviolet light (mJ/cm ² ) is obtained by UV irradiation intensity (mW/cm ² )×irradiation time (seconds). A high-pressure mercury lamp, a metal halide lamp, or a low-pressure mercury lamp can be used as the ultraviolet irradiation light source. Polymerization of compound 1 is preferably carried out under an inert gas atmosphere such as a nitrogen atmosphere, since this tends to reduce the proportion of residual monomers.

Moreover, the method for producing the optically anisotropic layer may include, for example, a step of peeling the optically anisotropic layer from the substrate.

[2. Optically Anisotropic Transfer Material]
An optically anisotropic transfer member of the present invention comprises a substrate and the optically anisotropic layer described above. Here, the optically anisotropic transfer member is a member including a plurality of layers, and a part of the layers is transferred to be used for manufacturing a product including the part of the layers. is. In the optically anisotropic transfer member of the present invention, the optically anisotropic layer is used for manufacturing the above product.

As the substrate, the same substrate as described in the method for producing the optically anisotropic layer can be used. Among them, as the base material, a peelable one is preferable. An optically anisotropic transfer member having such a substrate can be produced by performing the above-described method for producing an optically anisotropic layer using the substrate.

An optically anisotropic transfer member can be used in the production of optical films. For example, an optical film comprising an optically anisotropic layer and a resin film can be produced by laminating an optically anisotropic layer of an optically anisotropic transfer member and a resin film, and then peeling off the substrate.

[3. Optically Anisotropic Laminate]
The optically anisotropic laminate of the present invention comprises the above optically anisotropic layer and a retardation layer.

[3.1. Optically Anisotropic Layer in Optically Anisotropic Laminate]
As the optically anisotropic layer of the optically anisotropic laminate, the one described above is used. However, in the optically anisotropic laminate, the in-plane retardation Re (A590) of the optically anisotropic layer at a wavelength of 590 nm and the thickness direction retardation Rth (A590) of the optically anisotropic layer at a wavelength of 590 nm are , preferably satisfy the following formulas (8) and (9).
Re (A590) ≤ 10 nm (8)
-110 nm ≤ Rth (A590) ≤ -20 nm (9)

To explain the formula (8) in detail, Re(A590) is preferably 0 nm to 10 nm, more preferably 0 nm to 5 nm, and particularly preferably 0 nm to 2 nm. When Re (A590) is within the above range, optical design can be simplified when the optically anisotropic laminate is provided in an image display device.

Further, to explain the formula (9) in detail, Rth(A590) is preferably −110 nm or more, more preferably −100 nm or more, preferably −20 nm or less, more preferably −40 nm or less, and particularly preferably −50 nm or less. When an optically anisotropic laminate including an optically anisotropic layer having such Rth (A590) is incorporated in a circularly polarizing plate and applied to an image display device, in the tilt direction of the display surface of the image display device, , the function of suppressing the reflection of external light and allowing the light for displaying images to pass through polarized sunglasses can be effectively exhibited. Therefore, when the display surface of the image display device is viewed from an inclined direction, the visibility of the image can be effectively improved.

[3.2. Retardation Layer in Optically Anisotropic Laminate]
(3.2.1. Optical properties of retardation layer)
The retardation layer is a layer whose refractive indices nx(B), ny(B) and nz(B) satisfy nx(B)>ny(B)≧nz(B). Here, nx (B) represents the refractive index in the in-plane direction of the retardation layer and in the direction giving the maximum refractive index, and ny (B) is the in-plane direction of the retardation layer and the nx represents the refractive index in the direction perpendicular to the direction of (B), and nz(B) represents the refractive index in the thickness direction of the retardation layer. An optically anisotropic laminate having such a retardation layer can be combined with a linear polarizer to produce a circularly polarizing plate. This circularly polarizing plate is provided on the display surface of the image display device, so that when the display surface is viewed from the front, the reflection of external light is suppressed, and the light for displaying the image can be transmitted through the polarized sunglasses. It is possible to improve the visibility of the image.

Above all, it is preferable that the refractive index ny(B) and the refractive index nz(B) of the retardation layer are the same or close to each other. Specifically, the absolute value |ny(B)−nz(B)| of the difference between the refractive index ny(B) and the refractive index nz(B) is preferably 0.00000 to 0.00100, more preferably 0 0.00000 to 0.00050, particularly preferably 0.00000 to 0.00020. When the absolute value of the refractive index difference |ny(B)−nz(B)| falls within the above range, optical design can be simplified when the optically anisotropic laminate is provided in an image display device.

The in-plane retardation Re (B590) of the retardation layer at a wavelength of 590 nm preferably satisfies the following formula (7).
110 nm≦Re(B590)≦170 nm (7)

To explain the formula (7) in detail, Re(B590) is preferably 110 nm or more, more preferably 120 nm or more, particularly preferably 130 nm or more, preferably 170 nm or less, more preferably 160 nm or less, and particularly preferably 150 nm or less. Such an optically anisotropic laminate having a retardation layer having Re (B590) can be combined with a linear polarizer to obtain a circularly polarizing plate. By providing this circularly polarizing plate on the display surface of the image display device, when the display surface is viewed from the front, reflection of external light can be suppressed, and light for displaying images can be transmitted through polarized sunglasses. Therefore, it is possible to improve the visibility of the image.

The in-plane retardation Re (B450) of the retardation layer at a wavelength of 450 nm, the in-plane retardation Re (B550) of the retardation layer at a wavelength of 550 nm, and the in-plane retardation Re (B650) of the retardation layer at a wavelength of 650 nm are , preferably satisfies the following equations (5) and (6).
0.75<Re(B450)/Re(B550)<1.00 (5)
1.01<Re(B650)/Re(B550)<1.25 (6)

To explain the formula (5) in detail, Re(B450)/Re(B550) is preferably larger than 0.75, more preferably larger than 0.78, particularly preferably larger than 0.80, and It is preferably less than 1.00, more preferably less than 0.95, particularly preferably less than 0.90.

To explain the formula (6) in detail, Re(B650)/Re(B550) is preferably larger than 1.01, preferably larger than 1.02, particularly preferably larger than 1.04, and preferably is less than 1.25, more preferably less than 1.22, particularly preferably less than 1.19.

In the retardation layer having in-plane retardation Re (B450), Re (B550) and Re (B650) satisfying the above formulas (5) and (6), the in-plane retardation Re has reverse wavelength dispersion. show. Such an optically anisotropic laminate comprising a retardation layer exhibiting reverse wavelength dispersion of in-plane retardation Re, when incorporated in a circularly polarizing plate and applied to an image display device, has an effect on the display surface of the image display device. In the front direction, the functions of suppressing the reflection of external light and allowing the light for displaying an image to pass through polarized sunglasses can be exhibited in a wide wavelength range. Therefore, the visibility of the image displayed on the display surface can be particularly effectively improved.

The in-plane slow axis direction of the retardation layer is arbitrary and can be arbitrarily set according to the use of the optically anisotropic laminate. In particular, when the optically anisotropic laminate is a long film, the angle formed by the slow axis of the retardation layer and the film width direction is preferably more than 0° and less than 90°. In one aspect, the angle formed by the in-plane slow axis of the retardation layer and the film width direction is preferably 15°±5°, 22.5°±5°, 45°±5°, or 75°. °±5°, more preferably 15°±4°, 22.5°±4°, 45°±4°, or 75°±4°, even more preferably 15°±3°, 22.5°± It can be a specific range such as 3°, 45°±3°, or 75°±3°. By having such an angular relationship, it becomes possible to efficiently manufacture a circularly polarizing plate by laminating the optically anisotropic laminate to a long linear polarizer in a roll-to-roll manner.

The total light transmittance of the retardation layer is preferably 80% or higher, more preferably 85% or higher, particularly preferably 90% or higher. The haze of the retardation layer is preferably 5% or less, more preferably 3% or less, particularly preferably 1% or less, and ideally 0%.

(3.2.2. Stretched film layer as retardation layer)
A stretched film layer may be used as the retardation layer as described above. When a stretched film layer is used as the retardation layer, the stretched film layer may contain the resin that is the material of the base film described in the method for producing the optically anisotropic layer. A film layer containing such a resin can develop optical properties such as retardation by stretching. Above all, the stretched film layer preferably contains an alicyclic structure-containing polymer.

The stretching direction of the stretched film layer is arbitrary. Therefore, the stretching direction may be the longitudinal direction, the width direction, or the oblique direction. Furthermore, stretching may be performed in two or more directions among these stretching directions. Here, the oblique direction refers to an in-plane direction of the film, which is non-parallel to both the longitudinal direction and the width direction.

Among them, the stretched film layer is preferably an obliquely stretched film layer. That is, the stretched film layer is preferably a long film and stretched in a direction non-parallel to both the longitudinal direction and the width direction of the film. In the case of an obliquely stretched film layer, the angle formed by the film width direction and the stretching direction can be specifically more than 0° and less than 90°. By using such an obliquely stretched film layer as a retardation layer, it is possible to efficiently manufacture a circularly polarizing plate by laminating an optically anisotropic laminate to a long linear polarizer in a roll-to-roll manner. .

The angle formed by the stretching direction and the film width direction is preferably 15°±5°, 22.5±5°, 45°±5°, or 75°±5°, more preferably 15°±4°, 22 .5°±4°, 45°±4°, or 75°±4°, even more preferably 15°±3°, 22.5°±3°, 45°±3°, or 75°±3° It can be a specific range such as By having such an angular relationship, the optically anisotropic laminate can be used as a material that enables efficient production of a circularly polarizing plate.

Furthermore, the stretched film layer preferably has a multi-layer structure including a plurality of layers. A stretched film layer having a multilayer structure can exhibit various properties by combining the functions of each layer included in the stretched film layer. For example, the stretched film layer consists of a first outer layer made of a resin containing a polymer, an intermediate layer made of a resin containing a polymer and an ultraviolet absorber, and a second outer layer made of a resin containing a polymer, in this order. It is preferable to have At this time, the polymer contained in each layer may be different, but preferably the same. A stretched film layer comprising such a first outer layer, an intermediate layer and a second outer layer can suppress transmission of ultraviolet rays. Moreover, since the first outer layer and the second outer layer are provided on both sides of the intermediate layer, bleeding out of the ultraviolet absorber can be suppressed.

The amount of the ultraviolet absorber in the resin contained in the intermediate layer is preferably 3% by weight or more, more preferably 4% by weight or more, particularly preferably 5% by weight or more, and preferably 20% by weight or less, more preferably 18% by weight. % by weight or less, particularly preferably 16% by weight or less. When the amount of the ultraviolet absorber is at least the lower limit of the range, the ability of the stretched film layer to block the transmission of ultraviolet rays can be particularly enhanced. Visible light transparency can be enhanced.

The thickness of the intermediate layer is preferably set so that the ratio represented by "thickness of intermediate layer"/"thickness of entire stretched film layer" falls within a predetermined range. The predetermined range is preferably 1/5 or more, more preferably 1/4 or more, particularly preferably 1/3 or more, preferably 80/82 or less, more preferably 79/82 or less, particularly preferably 78/82 or less. When the ratio is at least the lower limit of the range, the ability of the stretched film layer to block the transmission of ultraviolet rays can be particularly enhanced, and when the ratio is at most the upper limit of the range, the thickness of the stretched film layer can be reduced. It can be made thin.

The thickness of the stretched film layer as the retardation layer is preferably 10 µm or more, more preferably 13 µm or more, particularly preferably 15 µm or more, and preferably 60 µm or less, more preferably 58 µm or less, and particularly preferably 55 µm or less. When the thickness of the stretched film layer is at least the lower limit value of the above range, the desired retardation can be expressed, and when it is at most the upper limit value of the above range, it can be made thinner.

The stretched film layer can be produced, for example, by a method including a step of preparing a pre-stretched film layer and a step of stretching the prepared pre-stretched film layer.

The unstretched film layer can be produced, for example, by molding a resin, which is the material of the stretched film layer, by an appropriate molding method. The molding method includes, for example, a cast molding method, an extrusion molding method, an inflation molding method, and the like. Among them, a melt extrusion method that does not use a solvent can efficiently reduce the amount of residual volatile components, and is preferable from the viewpoint of the global environment and work environment, and from the viewpoint of excellent production efficiency. Examples of the melt extrusion method include an inflation method using a die and the like, and among them, a method using a T-die is preferable from the viewpoint of excellent productivity and thickness accuracy.

When producing a stretched film layer having a multilayer structure, a film layer having a multilayer structure is usually prepared as a pre-stretching film layer. A pre-stretched film layer having such a multilayer structure can be produced, for example, by molding resins corresponding to each layer included in the multilayer structure by a molding method such as co-extrusion and co-casting. Among these molding methods, the coextrusion method is preferable because it is excellent in production efficiency and hardly leaves volatile components in the film. Examples of the coextrusion method include a coextrusion T-die method, a coextrusion inflation method, a coextrusion lamination method, and the like. Among them, the co-extrusion T-die method is preferred. The co-extrusion T-die method includes a feed block method and a multi-manifold method, and the multi-manifold method is particularly preferable because it can reduce variations in thickness.

By molding the resin as described above, a long pre-stretched film is obtained. By stretching the unstretched film, a stretched film layer is obtained. Stretching is usually carried out continuously while conveying the unstretched film in the longitudinal direction. At this time, the stretching direction may be the longitudinal direction or the width direction of the film, but is preferably an oblique direction. Further, the stretching may be free uniaxial stretching in which no restraining force is applied in directions other than the stretching direction, or may be stretching in which restraining force is applied in directions other than the stretching direction. These stretching can be performed using any stretching machine such as a roll stretching machine and a tenter stretching machine.

The draw ratio is preferably 1.1 times or more, more preferably 1.15 times or more, particularly preferably 1.2 times or more, preferably 3.0 times or less, more preferably 2.8 times or less, especially It is preferably 2.6 times or less. The refractive index in the drawing direction can be increased by setting the draw ratio to the lower limit of the above range or higher. Moreover, the slow axis direction of the stretched film layer can be easily controlled by making it equal to or less than the upper limit.

The stretching temperature is preferably Tg-5°C or higher, more preferably Tg-2°C or higher, particularly preferably Tg°C or higher, preferably Tg+40°C or lower, more preferably Tg+35°C or lower, and particularly preferably Tg+30°C or lower. be. Here, "Tg" represents the highest glass transition temperature of the polymer contained in the unstretched film layer. By setting the stretching temperature within the above range, the molecules contained in the unstretched film layer can be reliably oriented, so that a stretched film layer capable of functioning as a retardation layer having desired optical properties can be easily obtained. can be done.

(3.2.3. Liquid crystal layer as retardation layer)
As the retardation layer as described above, a liquid crystal layer containing a liquid crystal compound whose alignment state may be fixed (hereinafter sometimes referred to as a “liquid crystal compound for retardation layer”) may be used. In this case, as the liquid crystal compound for the retardation layer, it is preferable to use the aforementioned reverse wavelength dispersion liquid crystal compound in homogeneous alignment. This makes it possible to obtain the same advantages in the retardation layer as described in the section on the optically anisotropic layer. Among them, the liquid crystal layer as the retardation layer contains a compound represented by the formula (IIa) in which the alignment state may be fixed, a compound represented by the formula (IIb), or a mixture thereof. preferable.

In formulas (IIa) and (IIb), G ^a , Y ^a , Fx ¹ , Fx ² , Q, R ^I to R ^IV , p, p1, p2, Y ¹ to Y ⁸ , A ¹ , A ² , B ¹ , B ² , G ¹ , G ² , P ¹ , P ² , n and m have the same meanings as in formulas (Ia) and (Ib). Therefore, the compound represented by formula (IIa) and the compound represented by formula (IIb) represent the same compound as the compound represented by formula (Ia) and the compound represented by formula (Ib).

The thickness of the liquid crystal layer as the retardation layer is not particularly limited, and can be appropriately adjusted so that properties such as retardation can be within the desired range. A specific thickness of the liquid crystal layer is preferably 0.5 μm or more, more preferably 1.0 μm or more, preferably 10 μm or less, more preferably 7 μm or less, and particularly preferably 5 μm or less.

The liquid crystal layer as the retardation layer is prepared by, for example, a step of preparing a liquid crystal composition containing a liquid crystal compound for the retardation layer; a step of coating the liquid crystal composition on a support to obtain a layer of the liquid crystal composition; , orienting the liquid crystal compound for the retardation layer contained in the liquid crystal composition layer;

In the step of preparing the liquid crystal composition, the liquid crystal compound for the retardation layer is usually mixed with optional components used as necessary to obtain the liquid crystal composition.

The liquid crystal composition may contain a polymerizable monomer as an optional component. The term “polymerizable monomer” refers particularly to a compound other than the liquid crystal compound for the retardation layer described above, among compounds having polymerizability and capable of functioning as a monomer. As the polymerizable monomer, for example, one having one or more polymerizable groups per molecule can be used. Crosslinking polymerization can be achieved when the polymerizable monomer is a crosslinkable monomer having two or more polymerizable groups per molecule. Examples of such polymerizable groups include groups similar to the groups P ¹ -Y ⁷ - and P ² -Y ⁸ - in compound 1, more specifically acryloyl group, methacryloyl group, and epoxy groups. Moreover, one type of the polymerizable monomer may be used alone, or two or more types may be used in combination at an arbitrary ratio.
In the liquid crystal composition, the proportion of the polymerizable monomer is preferably 1 to 100 parts by weight, more preferably 5 to 50 parts by weight, with respect to 100 parts by weight of the liquid crystal compound for retardation layer.

The liquid crystal composition may contain a photopolymerization initiator as an optional component. The polymerization initiator includes, for example, the same polymerization initiators that can be contained in the coating liquid for producing the optically anisotropic layer. Moreover, one type of the polymerization initiator may be used alone, or two or more types may be used in combination at an arbitrary ratio.
In the liquid crystal composition, the proportion of the polymerization initiator is preferably 0.1 to 30 parts by weight, more preferably 0.5 to 10 parts by weight, with respect to 100 parts by weight of the polymerizable compound.

The liquid crystal composition may contain a surfactant as an optional component. A nonionic surfactant is preferable as the surfactant. A commercial item can be used as a nonionic surfactant. For example, a nonionic surfactant that is an oligomer with a molecular weight of several thousand can be used. Specific examples of these surfactants include "PF-151N", "PF-636", "PF-6320", "PF-656", "PF-6520", and "PF-3320" available from PolyFox manufactured by OMNOVA. , "PF-651", "PF-652"; Neos Ftergent's "FTX-209F", "FTX-208G", "FTX-204D", "601AD"; Seimi Chemical Company Surflon "KH-40" , “S-420” and the like can be used. Moreover, one type of surfactant may be used alone, or two or more types may be used in combination at an arbitrary ratio.
In the liquid crystal composition, the proportion of the surfactant is preferably 0.01 to 10 parts by weight, more preferably 0.1 to 2 parts by weight, with respect to 100 parts by weight of the polymerizable compound.

The liquid crystal composition may contain a solvent as an optional component. Examples of the solvent include the same solvents as those that can be contained in the coating liquid for producing the optically anisotropic layer. Moreover, a solvent may be used individually by 1 type, and may be used in combination of 2 or more types by arbitrary ratios.
In the liquid crystal composition, the proportion of the solvent is preferably 100 to 1000 parts by weight with respect to 100 parts by weight of the polymerizable compound.

The liquid crystal composition further contains, as optional components, metals, metal complexes, dyes, pigments, fluorescent materials, phosphorescent materials, leveling agents, thixotropic agents, gelling agents, polysaccharides, ultraviolet absorbers, infrared absorbers, antioxidants, additives such as agents, ion exchange resins, and metal oxides such as titanium oxide. The proportion of such additives is preferably 0.1 to 20 parts by weight with respect to 100 parts by weight of the polymerizable compound.

After preparing the liquid crystal composition as described above, a step of coating the liquid crystal composition on a support to obtain a layer of the liquid crystal composition is carried out. As the support, it is preferable to use a long support. When a long support is used, the liquid crystal composition can be continuously coated on the support which is continuously transported. Therefore, by using a long support, a liquid crystal layer as a retardation layer can be continuously manufactured, so that productivity can be improved.

When the liquid crystal composition is coated on a support, the support is applied with an appropriate tension (usually 100 N/m to 500 N/m) to reduce fluttering during transportation of the support, and the coating is performed while maintaining flatness. preferably. The flatness is the amount of deflection in the width direction of the support and in the vertical direction perpendicular to the transport direction, and is ideally 0 mm, but usually 1 mm or less.

A support film is usually used as the support. As the support film, a film that can be used as a support for an optical laminate can be appropriately selected and used. Among them, from the viewpoint of making an optically anisotropic laminate comprising a support film, a retardation layer and an optically anisotropic layer usable as an optical film and eliminating the need for peeling of the support film, the support film is transparent. films are preferred. Specifically, the total light transmittance of the support film is preferably 80% or higher, more preferably 85% or higher, and particularly preferably 88% or higher.

The material of the support film is not particularly limited, and various resins can be used. Examples of the resin include a resin containing the polymer described as the material for the substrate that can be used for forming the optically anisotropic layer. Among these, from the viewpoint of transparency, low hygroscopicity, dimensional stability and light weight, the polymer contained in the resin is preferably an alicyclic structure-containing polymer and a cellulose ester, and an alicyclic structure-containing polymer is preferred. more preferred.

As the support, one having orientation control power can be used. The alignment regulating force of the support refers to the property of the support capable of orienting the liquid crystal compound for the retardation layer in the liquid crystal composition coated on the support.

The orientation regulating force can be imparted by subjecting a member such as a film, which is the material of the support, to a treatment for imparting an orientation regulating force. Examples of such treatments include stretching and rubbing.

In preferred embodiments, the support is a stretched film. By forming such a stretched film, a support having an orientation regulating force corresponding to the stretching direction can be obtained.

The stretching direction of the stretched film is arbitrary. Therefore, the stretching direction may be the longitudinal direction, the width direction, or the oblique direction. Furthermore, stretching may be performed in two or more directions among these stretching directions. The draw ratio can be appropriately set within a range in which an orientation regulating force is generated on the surface of the support. When the material of the support is a resin having a positive intrinsic birefringence value, the molecules are oriented in the stretching direction and a slow axis appears in the stretching direction. Stretching can be performed using a known stretching machine such as a tenter stretching machine.

In a more preferred embodiment, the support is an obliquely stretched film. When the support is an obliquely stretched film, the angle formed by the stretching direction and the width direction of the stretched film can specifically be more than 0° and less than 90°. By using such an obliquely stretched film as a support, the optically anisotropic laminate can be made into a material that enables efficient production of a circularly polarizing plate.

In one embodiment, the angle formed by the stretching direction and the width direction of the stretched film is preferably 15°±5°, 22.5±5°, 45°±5°, or 75°±5°, more preferably is 15°±4°, 22.5°±4°, 45°±4°, or 75°±4°, even more preferably 15°±3°, 22.5°±3°, 45°±3° °, or a specific range such as 75°±3°. By having such an angular relationship, the optically anisotropic laminate can be used as a material that enables efficient production of a circularly polarizing plate.

Examples of coating methods for the liquid crystal composition include curtain coating, extrusion coating, roll coating, spin coating, dip coating, bar coating, spray coating, slide coating, print coating, and gravure coating. method, die coating method, gap coating method, and dipping method. The thickness of the layer of the liquid crystal composition to be applied can be appropriately set according to the desired thickness required for the liquid crystal layer as the retardation layer.

After coating the liquid crystal composition on the support to obtain a layer of the liquid crystal composition, a step of orienting the liquid crystal compound for the retardation layer contained in the layer of the liquid crystal composition is performed. As a result, the liquid crystal compound for the retardation layer contained in the layer of the liquid crystal composition is aligned in the alignment direction according to the alignment control force of the support. For example, when a stretched film is used as the support, the liquid crystal compound for retardation layer contained in the liquid crystal composition layer is oriented parallel to the stretching direction of the stretched film.

Alignment of the liquid crystal compound for the retardation layer may be achieved immediately by coating, but may be achieved by applying an alignment treatment such as heating after coating, if necessary. The conditions for alignment treatment can be appropriately set according to the properties of the liquid crystal composition to be used.

By orienting the liquid crystal compound for the retardation layer in the liquid crystal composition layer as described above, the desired optical properties are exhibited in the liquid crystal composition layer, so that a liquid crystal layer capable of functioning as a retardation layer can be obtained.

The method for manufacturing the liquid crystal layer as the retardation layer described above can further include any steps. The method for producing the liquid crystal layer may include, for example, a step of drying the liquid crystal composition layer or the liquid crystal layer. Such drying can be achieved by drying methods such as natural drying, heat drying, reduced pressure drying, and reduced pressure heat drying.

Further, in the method for producing a liquid crystal layer as a retardation layer, for example, after aligning the liquid crystal compound for the retardation layer contained in the liquid crystal composition, a step of fixing the alignment state of the liquid crystal compound for the retardation layer is performed. may In this step, the alignment state of the liquid crystal compound for the retardation layer is usually fixed by polymerizing the liquid crystal compound for the retardation layer. Moreover, by polymerizing the liquid crystal compound for the retardation layer, the rigidity of the liquid crystal layer can be increased and the mechanical strength can be improved.

For the polymerization of the liquid crystal compound for the retardation layer, a method suitable for the properties of the components of the liquid crystal composition can be appropriately selected. For example, a method of irradiating with light is preferable. Among them, the method of irradiating ultraviolet rays is preferable because the operation is simple. Irradiation conditions such as ultraviolet irradiation intensity, ultraviolet irradiation time, ultraviolet light amount, and ultraviolet irradiation light source can be adjusted within the same range as the irradiation conditions in the method for producing an optically anisotropic layer.

During the polymerization, the liquid crystal compound for the retardation layer is usually polymerized while maintaining the orientation of the molecules. Therefore, by the polymerization, a liquid crystal layer containing the polymer of the liquid crystal compound for the retardation layer oriented in the direction parallel to the alignment direction of the liquid crystal compound for the retardation layer contained in the liquid crystal composition before polymerization is obtained. . Therefore, for example, when a stretched film is used as the support, a liquid crystal layer having an orientation direction parallel to the stretching direction of the stretched film can be obtained. Here, the term "parallel" means that the orientation direction of the stretched film and the orientation direction of the polymer of the liquid crystal compound for the retardation layer are usually ±3°, preferably ±1°, and ideally 0°.

In the liquid crystal layer as the retardation layer produced by the production method described above, the polymer molecules obtained from the liquid crystal compound for the retardation layer preferably have alignment regularity horizontally aligned with respect to the support film. . For example, when a support film having an alignment regulating force is used, the molecules of the polymer of the liquid crystal compound for the retardation layer can be horizontally aligned in the liquid crystal layer. Here, the “horizontal alignment” of the molecules of the polymer of the liquid crystal compound for the retardation layer with respect to the support film means that the mesogenic skeleton of the structural unit derived from the liquid crystal compound for the retardation layer contained in the polymer is aligned in the long axis direction. It refers to orientation in one direction in which the average direction is parallel or nearly parallel to the film surface (for example, the angle formed with the film surface is within 5°). When a plurality of types of mesogenic skeletons with different alignment directions are present in the liquid crystal layer, as in the case of using the compound represented by formula (II) as the liquid crystal compound for the retardation layer, usually the most The orientation direction is the direction in which the long axis direction of the mesogen skeleton of the long type is oriented.

Furthermore, the method for producing a liquid crystal layer as a retardation layer may include a step of peeling off the support after obtaining the liquid crystal layer.

[3.3. Arbitrary layer in the optically anisotropic laminate]
The optically anisotropic laminate may further comprise an arbitrary layer in combination with the optically anisotropic layer and the retardation layer. Optional layers include, for example, an adhesive layer and a hard coat layer.

[3.4. Manufacturing Method of Optically Anisotropic Laminate]
The optically anisotropic laminate can be produced, for example, by production method 1 or 2 below.

・Manufacturing method 1:
A step of manufacturing a retardation layer;
A step of forming an optically anisotropic layer on the retardation layer by performing the above-described method for producing an optically anisotropic layer using the retardation layer as a base material to obtain an optically anisotropic laminate. and, a method of manufacturing.

When the coating liquid is applied on the retardation layer as in the production method 1, the optically anisotropic layer is formed on the retardation layer by drying the coating liquid layer to form an optically anisotropic laminate. is obtained.

・Manufacturing method 2:
A step of manufacturing a retardation layer;
a step of manufacturing an optically anisotropic transfer member;
a step of bonding an optically anisotropic layer of an optically anisotropic transfer member and a retardation layer to obtain an optically anisotropic laminate;
and a step of peeling off the substrate of the optically anisotropic transfer member.

When an optically anisotropic layer and a retardation layer are laminated to produce an optically anisotropic laminate as in production method 2, an appropriate adhesive can be used for the lamination. As this adhesive, for example, the same adhesive as used in the polarizing plate described later can be used.

Moreover, the method for producing the optically anisotropic laminate may include arbitrary steps in addition to the steps described above. For example, the manufacturing method may include a step of providing an arbitrary layer such as a hard coat layer.

[4. Polarizer]
The polarizing plate of the present invention comprises a linear polarizer and the above-described optically anisotropic layer, optically anisotropic transfer body, or optically anisotropic laminate. By providing such a polarizing plate in the image display device, it is possible to improve the visibility of an image when the image display device is viewed from an inclined direction.

As the linear polarizer, known linear polarizers used in devices such as liquid crystal display devices and other optical devices can be used. Examples of linear polarizers include a film obtained by adsorbing iodine or a dichroic dye onto a polyvinyl alcohol film and then uniaxially stretching the film in a boric acid bath; a film obtained by stretching, stretching, and modifying some of the polyvinyl alcohol units in the molecular chain into polyvinylene units; Other examples of linear polarizers include polarizers having a function of separating polarized light into reflected light and transmitted light, such as grid polarizers, multilayer polarizers, and cholesteric liquid crystal polarizers. Among these, a polarizer containing polyvinyl alcohol is preferable as the linear polarizer.

When natural light enters a linear polarizer, only one polarized light is transmitted. Although the degree of polarization of this linear polarizer is not particularly limited, it is preferably 98% or more, more preferably 99% or more.
Also, the thickness of the linear polarizer is preferably 5 μm to 80 μm.

The polarizing plate may further include an adhesive layer for bonding the linear polarizer and the optically anisotropic layer, optically anisotropic transfer body, or optically anisotropic laminate. As the adhesive layer, a layer obtained by curing a curable adhesive can be used. As the curable adhesive, a thermosetting adhesive may be used, but a photocurable adhesive is preferably used. As the photocurable adhesive, one containing a polymer or a reactive monomer can be used. Moreover, the adhesive may contain a solvent, a photopolymerization initiator, other additives, etc., as necessary.

A photocurable adhesive is an adhesive that can be cured by irradiation with light such as visible light, ultraviolet light, and infrared light. Among them, an adhesive that can be cured with ultraviolet rays is preferable because of its simple operation.

The thickness of the adhesive layer is preferably 0.5 µm or more, more preferably 1 µm or more, and preferably 30 µm or less, more preferably 20 µm or less, and even more preferably 10 µm or less. By setting the thickness of the adhesive layer within the above range, good adhesion can be achieved without impairing the optical properties of the optically anisotropic layer.

Moreover, when the polarizing plate includes an optically anisotropic laminate, the polarizing plate can function as a circularly polarizing plate. Such a circularly polarizing plate may comprise a linear polarizer, an optically anisotropic layer and a retardation layer in this order. Moreover, such a circularly polarizing plate may comprise a linear polarizer, a retardation layer and an optically anisotropic layer in this order.

In the circularly polarizing plate as described above, the angle formed by the slow axis of the retardation layer with respect to the polarization absorption axis of the linear polarizer is preferably 45° or an angle close thereto. Specifically, the angle is preferably 45°±5°, more preferably 45°±4°, particularly preferably 45°±3°.

The polarizers described above may further include optional layers. Optional layers include, for example, a polarizer protective film layer. Any transparent film layer can be used as the polarizer protective film layer. Among them, a resin film layer that is excellent in transparency, mechanical strength, thermal stability, moisture shielding property, etc. is preferable. Examples of such resins include acetate resins such as triacetyl cellulose, polyester resins, polyethersulfone resins, polycarbonate resins, polyamide resins, polyimide resins, linear olefin resins, cyclic olefin resins, (meth)acrylic resins, and the like. be done. Further, optional layers that the polarizing plate may contain include, for example, a hard coat layer such as an impact-resistant polymethacrylate resin layer, a matte layer that improves the slipperiness of the film, an antireflection layer, an antifouling layer, and the like. As for these optional layers, only one layer may be provided, or two or more layers may be provided.

A polarizing plate can be produced by laminating a linear polarizer, an optically anisotropic layer, an optically anisotropic transfer member, or an optically anisotropic laminate, using an adhesive if necessary.

[5. Image display device]
An image display device of the present invention includes an image display element and the polarizing plate of the present invention described above. In the image display device, the polarizing plate is usually provided on the viewing side of the image display element. At this time, the orientation of the polarizing plate can be arbitrarily set according to the use of the polarizing plate. Therefore, the image display device may include, in this order, an optically anisotropic layer, an optically anisotropic transfer member or an optically anisotropic laminate; a polarizer; and an image display element. Further, the image display device may include, in this order, a polarizer; an optically anisotropic layer, an optically anisotropic transfer body or an optically anisotropic laminate; and an image display element.

There are various types of image display devices according to the type of image display element. Typical examples include a liquid crystal display device including a liquid crystal cell as an image display element and an organic EL element as an image display element. and an organic EL display device.
Preferred embodiments of the image display device will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view schematically showing an organic EL display device 100 as an image display device according to the first embodiment of the invention.
As shown in FIG. 1, the organic EL display device 100 includes an organic EL element 110 as an image display element; an optically anisotropic laminate 120 including a retardation layer 121 and an optically anisotropic layer 122; and a linear polarizer. 130 are provided in this order. FIG. 1 shows an example in which the retardation layer 121 and the optically anisotropic layer 122 are provided in this order from the organic EL element 110 side. The retardation layers 121 may be provided in this order.

In the organic EL display device 100, the retardation layer 121 is provided such that the angle formed by the slow axis of the retardation layer 121 with respect to the polarization absorption axis of the linear polarizer 130 is 45° or an angle close thereto. The angle of 45° or close to it is, for example, preferably 45°±5°, more preferably 45°±4°, particularly preferably 45°±3°. Accordingly, the combination of the retardation layer 121 and the linear polarizer 130 exhibits the function of a circularly polarizing plate, and can suppress glare on the display surface 100U due to reflection of external light.

Specifically, only a portion of the light incident from outside the device passes through the linear polarizer 130, and then passes through the optically anisotropic laminate 120 including the retardation layer 121. resulting in circularly polarized light. The circularly polarized light is reflected by a light-reflecting component (such as a reflective electrode (not shown) in the organic EL element 110) in the display device, and passes through the optically anisotropic laminate 120 again to enter. It becomes linearly polarized light having a vibration direction perpendicular to that of the linearly polarized light, and does not pass through the linear polarizer 130 . Here, the vibration direction of the linearly polarized light means the vibration direction of the electric field of the linearly polarized light. As a result, a function of suppressing reflection is achieved (for the principle of suppressing reflection in an organic EL display device, see Japanese Patent Application Laid-Open No. 9-127885).

Furthermore, in the organic EL display device 100, the optically anisotropic laminate 120 includes the optically anisotropic layer 122 that can function as a positive C film. It can also be exhibited in an inclined direction. Furthermore, since the optically anisotropic layer 122 exhibits reverse wavelength dispersion in retardation Rth in the thickness direction, it is possible to suppress reflection of light in a wide wavelength range. Furthermore, compared to an organic EL display device using a positive C film in which retardation in the thickness direction exhibits normal wavelength dispersion, it is possible to suppress color change of reflected light when viewed from the tilt direction of the display surface 100U. Therefore, the organic EL display device 100 can effectively suppress the reflection of external light in both the front direction and the tilt direction of the display surface 100U, thereby improving the visibility of the image.

FIG. 2 is a cross-sectional view schematically showing an organic EL display device 200 as an image display device according to the second embodiment of the invention.
As shown in FIG. 2, the organic EL display device 200 includes an organic EL element 210 as an image display element; a λ/4 wavelength plate 220; a linear polarizer 230; An optically anisotropic laminate 240 is provided in this order. FIG. 2 shows an example in which the retardation layer 241 and the optically anisotropic layer 242 are provided in this order from the organic EL element 210 side. The retardation layers 241 may be provided in this order.

As the λ/4 wavelength plate 220, a member capable of converting linearly polarized light transmitted through the linear polarizer 230 into circularly polarized light can be used. As such a λ/4 wavelength plate 220, for example, a film having an in-plane retardation Re in the same range as the retardation layer 241 can be used. Also, the λ/4 wavelength plate 220 is provided so that the angle formed by the slow axis of the λ/4 wavelength plate 220 with respect to the polarization absorption axis of the linear polarizer 230 is 45° or an angle close thereto. The angle of 45° or close to it is, for example, preferably 45°±5°, more preferably 45°±4°, particularly preferably 45°±3°. Thus, the combination of the λ/4 wavelength plate 220 and the linear polarizer 230 exhibits the function of a circularly polarizing plate, and can suppress glare on the display surface 200U due to reflection of external light.

Further, in the organic EL display device 200, the retardation layer 241 is provided so that the angle formed by the slow axis of the retardation layer 241 with respect to the polarization absorption axis of the linear polarizer 230 is 45° or an angle close thereto. be done. The angle of 45° or close to it is, for example, preferably 45°±5°, more preferably 45°±4°, particularly preferably 45°±3°.

In such an organic EL display device 200, an image is displayed by light emitted from the organic EL element 210 and passing through the λ/4 wavelength plate 220, the linear polarizer 230, and the optically anisotropic laminate 240. Therefore, the light that displays an image is linearly polarized when it passes through the linear polarizer 230 , but is converted into circularly polarized light by passing through the optically anisotropic laminate 240 including the retardation layer 241 . Therefore, in the organic EL display device 200 described above, since an image is displayed by circularly polarized light, the image can be visually recognized when the display surface 200U is viewed through polarized sunglasses.

Furthermore, in the organic EL display device 200, the optically anisotropic laminate 240 includes the optically anisotropic layer 242 that can function as a positive C film. , polarized sunglasses can be transmitted even in the direction of inclination. Furthermore, the optically anisotropic layer 242 exhibits reverse wavelength dispersion in retardation Rth in the thickness direction, so that light in a wide wavelength range can pass through the polarized sunglasses. Therefore, the organic EL display device 200 can enhance the visibility of images through polarized sunglasses in both the front direction and the tilt direction of the display surface 200U.

The organic EL devices 110 and 210 have a transparent electrode layer, a light emitting layer and an electrode layer in this order, and the light emitting layer can emit light when a voltage is applied from the transparent electrode layer and the electrode layer. Examples of materials constituting the organic light-emitting layer include polyparaphenylenevinylene-based, polyfluorene-based, and polyvinylcarbazole-based materials. Further, the light-emitting layer may have a laminate of layers emitting light of different colors, or a mixed layer in which a certain dye layer is doped with a different dye. Furthermore, the organic EL elements 110 and 210 may have functional layers such as a hole injection layer, a hole transport layer, an electron injection layer, an electron transport layer, an equipotential surface formation layer, and a charge generation layer.

FIG. 3 is a cross-sectional view schematically showing a liquid crystal display device 300 as an image display device according to the third embodiment of the invention.
As shown in FIG. 3, the liquid crystal display device 300 includes a light source 310; a light source side linear polarizer 320; a liquid crystal cell 330 as an image display element; a viewing side linear polarizer 340; An optically anisotropic laminate 350 comprising a layer 352; is provided in this order. FIG. 3 shows an example in which the retardation layer 351 and the optically anisotropic layer 352 are provided in this order from the liquid crystal cell 330 side. Layers 351 may be provided in this order.

In the liquid crystal display device 300, the retardation layer 351 is provided so that the angle formed by the slow axis of the retardation layer 351 with respect to the polarization absorption axis of the viewer-side linear polarizer 340 is 45° or an angle close thereto. . An angle of 45° or near it is, for example, preferably 45°±5°, more preferably 45°±4°, particularly preferably 45°±3°.

In such a liquid crystal display device 300, an image is formed by light emitted from the light source 310 and passing through the light source side linear polarizer 320, the liquid crystal cell 330, the viewing side linear polarizer 340, and the optically anisotropic laminate 350. Is displayed. Therefore, the light for displaying an image is linearly polarized when it passes through the viewing-side linear polarizer 340, but is converted into circularly polarized light by passing through the optically anisotropic laminate 350 including the retardation layer 351. be. Therefore, in the liquid crystal display device 300 described above, since an image is displayed by circularly polarized light, the image can be visually recognized when the display surface 300U is viewed through polarized sunglasses.

Furthermore, in the liquid crystal display device 300, the optically anisotropic laminate 350 is provided with the optically anisotropic layer 352 that can function as a positive C film, so that the light for displaying images is directed not only in the front direction of the display surface 300U, but also in the front direction. Polarized sunglasses can be transmitted even in the direction of inclination. Furthermore, the optically anisotropic layer 352 exhibits reverse wavelength dispersion in retardation Rth in the thickness direction, so that light in a wide wavelength range can pass through the polarized sunglasses. Therefore, the liquid crystal display device 300 can enhance the visibility of an image through polarized sunglasses both in the front direction and the tilt direction of the display surface 300U.

The liquid crystal cell 330 is, for example, in-plane switching (IPS) mode, vertical alignment (VA) mode, multi-domain vertical alignment (MVA) mode, continuous spin-wheel alignment (CPA) mode, hybrid alignment nematic (HAN) mode, twisted A liquid crystal cell of any mode such as nematic (TN) mode, super twisted nematic (STN) mode, optically compensated bend (OCB) mode, etc. can be used. Among them, the IPS mode liquid crystal cell 330 can effectively widen the viewing angle by the optically anisotropic layer 352, and furthermore, has the effect of improving the contrast and color change when the display surface 300U is viewed from the tilt direction. Therefore, it is preferable.

EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples. However, the present invention is not limited to the examples shown below, and can be arbitrarily modified without departing from the scope of the claims of the present invention and their equivalents. In the following description, "%" and "parts" representing amounts are by weight unless otherwise specified. In addition, unless otherwise specified, the operations described below were performed in normal temperature and normal pressure atmosphere.

[Evaluation method]
[Method for measuring retardation and refractive index, and method for evaluating reverse wavelength dispersion thereof]
Retardation and inverse of a sample layer (optically anisotropic layer, retardation layer, etc.) formed on a certain film (base film; support film; multi-layer film consisting of support film and retardation layer; etc.) Wavelength dispersion characteristics were measured by the following method.

A sample layer to be evaluated was attached to a slide glass with an adhesive (the adhesive is "CS9621T" manufactured by Nitto Denko Corporation). The film was then peeled off to obtain a sample comprising a glass slide and sample layer. This sample was placed on the stage of a phase difference meter (manufactured by Axometrics) to measure the wavelength dispersion of the in-plane retardation Re of the sample layer. Here, the chromatic dispersion of the in-plane retardation Re is a graph representing the in-plane retardation Re for each wavelength. be From the wavelength dispersion of the in-plane retardation Re of the sample layer thus obtained, the in-plane retardation Re(450), Re(550), Re(590) and Re( 650) was obtained.

Further, the stage was tilted by 40° with the slow axis of the sample layer as the axis of rotation, and the wavelength dispersion of the retardation Re40 of the sample layer in the tilt direction forming an angle of 40° with respect to the thickness direction of the sample layer was measured. Here, the chromatic dispersion of retardation Re40 is a graph representing retardation Re40 for each wavelength, and is shown as a graph, for example, with coordinates having wavelength on the horizontal axis and in-plane retardation Re40 on the vertical axis.

Furthermore, using a prism coupler (manufactured by Metricon), the refractive index nx in the in-plane direction of the sample layer in the direction that gives the maximum refractive index, the in-plane direction and the direction perpendicular to the nx direction The refractive index ny and the refractive index nz in the thickness direction were measured at wavelengths of 407 nm, 532 nm and 633 nm, and Cauchy fitting was performed to obtain the wavelength dispersion of the refractive indices nx, ny and nz. Here, the wavelength dispersion of the refractive index is a graph representing the refractive index for each wavelength, and is shown as a graph, for example, with coordinates having the wavelength on the horizontal axis and the refractive index on the vertical axis.

After that, based on the data of the retardation Re40 and the wavelength dispersion of the refractive index, the wavelength dispersion of the retardation Rth in the thickness direction of the sample layer was calculated. Here, the chromatic dispersion of the retardation Rth in the thickness direction is a graph representing the retardation Rth in the thickness direction for each wavelength. be Then, from the wavelength dispersion of the thickness direction retardation Rth of the sample layer thus obtained, the thickness direction retardation Rth (450), Rth (550), Rth (590) of the sample layer at wavelengths of 450 nm, 550 nm, 590 nm and 650 nm ) and Rth(650) were determined.

[Method for measuring thickness]
The thickness of a sample layer (optically anisotropic layer, retardation layer, etc.) formed on a film (base film; support film; multilayer film consisting of a support film and a retardation layer; etc.) The thickness was measured using a thickness measuring device (“Filmetrics” manufactured by Filmetrics).

[Evaluation method of surface condition]
A flat glass with an optical adhesive (CS9621 manufactured by Nitto Denko) was prepared. The optically anisotropic transfer material (Examples 1 to 2, 4 to 5 and 7 to 8, and Comparative Examples 1 to 4) or the optically anisotropic laminate (Example 3) was applied to this flat glass. The adhesive layer was transferred to obtain a laminate for haze measurement. Using this laminate for haze measurement, the haze of the optically anisotropic layer was measured with a haze meter ("Haze Guard II" manufactured by Toyo Seiki Seisakusho). As a result of the measurement, if the haze is less than 0.5%, the surface condition is determined to be "good", and if the haze is 0.5% or more and less than 1.0%, the surface condition is determined to be "slightly cloudy". If the haze was 1.0% or more, the surface state was determined to be "cloudy".
In Example 6, the surface state of the optically anisotropic layer was visually observed under a fluorescent lamp, and the film was judged to be "good" when shrinkage wrinkles and cloudiness of the film were not observed, and judged to be "poor" when they were observed. did.

[Example 1]
55 parts by weight of a photopolymerizable reverse wavelength dispersion liquid crystal compound (CN point is 99° C.) represented by the following formula (B1), and 45 parts by weight of poly(9-vinylcarbazole) as a positive C polymer were added to a solid. It was dissolved in 1,3-dioxolane (DOL) to give a concentration of 12% to prepare a coating solution.

As a substrate film, an unstretched film made of a resin containing an alicyclic structure-containing polymer (manufactured by Zeon Corporation, glass transition temperature (Tg) of resin: 163° C., thickness: 100 μm) was prepared. The coating liquid was applied onto the surface of the substrate film using an applicator to form a coating liquid layer. The thickness of the coating liquid layer was adjusted so that the resulting optically anisotropic layer had a thickness of about 10 μm.

After that, the coating liquid layer was dried in an oven at 85° C. for about 10 minutes to evaporate the solvent in the coating liquid layer. As a result, an optically anisotropic layer was formed on the base film to obtain an optically anisotropic transfer member comprising the base film and the optically anisotropic layer. Using the optically anisotropic transfer member thus obtained, the optically anisotropic layer was evaluated by the method described above.

[Example 2]
The type of positive C polymer was changed to a copolymer of diisopropyl fumarate and cinnamate. This copolymer was a polyfumarate ester (weight average molecular weight: 72,000) having repeating units represented by the following formula (P1) and repeating units represented by the following formula (P2). In the formulas (P1) and (P2) below, R represents an isopropyl group, and the ratio of the repeating unit numbers m and n was m:n=85:15.

An optically anisotropic transfer member comprising a substrate film and an optically anisotropic layer was produced and the optically anisotropic layer was evaluated in the same manner as in Example 1 except for the above items.

[Example 3]
A multilayer film comprising a support film and a retardation layer was produced by the following method.

100 parts by weight of a photopolymerizable reverse wavelength dispersion liquid crystal compound represented by the formula (B1) (CN point is 99 ° C.), 3 parts by weight of a photopolymerization initiator ("Irgacure 379EG" manufactured by BASF), and a surfactant ("Megafac F-562" manufactured by DIC Corporation) was mixed with 0.3 parts by weight, and a mixed solvent of cyclopentanone and 1,3-dioxolane (weight ratio cyclopentanone: 1,3-dioxolane = 4:6) was added so that the solid content was 22% by weight, and dissolved by heating to 50°C. The resulting mixture was filtered through a membrane filter with a pore size of 0.45 μm to obtain a liquid crystal composition.

As a support film, a long obliquely stretched film made of a resin containing an alicyclic structure-containing polymer ("Zeonor Film" manufactured by Nippon Zeon Co., Ltd., a glass transition temperature (Tg) of the resin of 126 ° C., a thickness of 47 μm, and a wavelength of 550 nm The in-plane retardation was 141 nm, and the stretching direction was 45° with respect to the width direction).

The liquid liquid crystal composition was applied onto the support film with a die coater to form a layer of the liquid crystal composition. The thickness of the liquid crystal composition layer was adjusted so that the resulting retardation layer had a thickness of about 2.5 μm.

Thereafter, the liquid crystal composition layer is dried in an oven at 110° C. for about 4 minutes to evaporate the solvent in the liquid crystal composition layer, and at the same time remove the liquid crystal compound contained in the liquid crystal composition layer from the support film. It was homogeneously oriented in the stretching direction.

After that, the layer of the liquid crystal composition was irradiated with ultraviolet rays using an ultraviolet irradiation device. This ultraviolet irradiation was performed in a nitrogen atmosphere with the support film fixed to a SUS plate heated to 60° C. with a tape. The liquid crystal composition layer was cured by irradiation with ultraviolet rays to form a retardation layer on the support film. As a result, a multilayer film including a support film and a retardation layer was obtained.

When the retardation of the retardation layer of the obtained multilayer film was measured by the method described above, in-plane retardation at wavelengths of 450 nm, 550 nm, 590 nm and 650 nm Re (B450), Re (B550), Re (B590) and Re (B650) was as shown in Table 1 below. Further, when the refractive index of the retardation layer was measured by the method described above, the refractive index nx (B) in the in-plane direction of the retardation layer and in the direction giving the maximum refractive index, the in-plane of the retardation layer The refractive index ny(B) in the direction perpendicular to the direction of nx(B) and the refractive index nz(B) in the thickness direction of the retardation layer were as shown in Table 1 below.

As the base film, instead of the unstretched film used in Example 1, a multilayer film including a support film and a retardation layer was used. An optically anisotropic laminate comprising a support film, a retardation layer and an optically anisotropic layer in this order was produced in the same manner as in Example 1 except for the above. Using the optically anisotropic laminate thus obtained, the optically anisotropic layer was evaluated by the method described above.

[Example 4]
As the base film, instead of the unstretched film used in Example 1, a long obliquely stretched film made of a resin containing an alicyclic structure-containing polymer (“Zeonor film” manufactured by Nippon Zeon Co., Ltd., the glass transition of the resin A temperature (Tg) of 126° C., a thickness of 47 μm, an in-plane retardation of 141 nm at a wavelength of 550 nm, and a stretching direction of 45° with respect to the width direction were used. Except for the above, in the same manner as in Example 1, an optically anisotropic transfer member comprising a base film and an optically anisotropic layer in this order was produced, and the optically anisotropic layer was evaluated.

[Example 5]
Instead of 55 parts by weight of the photopolymerizable reverse wavelength dispersion liquid crystal compound represented by the formula (B1), a photopolymerizable reverse wavelength dispersion liquid crystal compound represented by the following formula (B2) (CN point is 105 ° C.) 50 parts by weight were used. Furthermore, the amount of poly(9-vinylcarbazole) as the positive C polymer was changed from 45 parts by weight to 50 parts by weight. An optically anisotropic transfer member comprising a base film and an optically anisotropic layer was produced and the optically anisotropic layer was evaluated in the same manner as in Example 1 except for the above items.

[Example 6]
As a stretched film layer as a retardation layer, an obliquely stretched film (“Zeonor film” manufactured by Nippon Zeon Co., Ltd., resin glass transition temperature (Tg) 126 ° C., thickness 47 μm, in-plane retardation at wavelength 550 nm 141 nm, refractive index nx ( B)>ny(B)≧nz(B), and the stretching direction is a direction at 45° to the width direction).

The optically anisotropic layer-side surface of the optically anisotropic transfer material prepared in Example 1 and one surface of the obliquely stretched film were laminated via an adhesive layer ("CS9621T" manufactured by Nitto Denko). Then, a laminate comprising a substrate film, an optically anisotropic layer, an adhesive layer and an obliquely stretched film in this order was obtained. At this time, a laminator was used for lamination.

Subsequently, by peeling off the base film from the laminate, an optically anisotropic laminate comprising an optically anisotropic layer, an adhesive layer and an obliquely stretched film in this order was obtained. The surface state of the optically anisotropic laminate thus obtained was evaluated by the method described above, and the results were good.

[Example 7]
The amount of the photopolymerizable reverse wavelength dispersion liquid crystal compound represented by formula (B1) was changed from 55 parts by weight to 60 parts by weight. Also, the amount of poly(9-vinylcarbazole) as the positive C polymer was changed from 45 parts by weight to 40 parts by weight. An optically anisotropic transfer member comprising a base film and an optically anisotropic layer was produced and the optically anisotropic layer was evaluated in the same manner as in Example 1 except for the above items.

[Example 8]
The amount of the photopolymerizable reverse wavelength dispersion liquid crystal compound represented by formula (B1) was changed from 55 parts by weight to 65 parts by weight. Also, the amount of poly(9-vinylcarbazole) as the positive C polymer was changed from 45 parts by weight to 35 parts by weight. An optically anisotropic transfer member comprising a base film and an optically anisotropic layer was produced and the optically anisotropic layer was evaluated in the same manner as in Example 1 except for the above items.

[Example 9]
Instead of 55 parts by weight of the photopolymerizable reverse wavelength dispersion liquid crystal compound represented by the formula (B1), a photopolymerizable reverse wavelength dispersion liquid crystal compound represented by the following formula (B3) (CN point is 110 ° C.) 60 parts by weight were used. Furthermore, the amount of poly(9-vinylcarbazole) as the positive C polymer was changed from 45 parts by weight to 40 parts by weight. An optically anisotropic transfer member comprising a base film and an optically anisotropic layer was produced and the optically anisotropic layer was evaluated in the same manner as in Example 1 except for the above items.

[Example 10]
Instead of 55 parts by weight of the photopolymerizable reverse wavelength dispersion liquid crystal compound represented by the formula (B3), a photopolymerizable reverse wavelength dispersion liquid crystal compound represented by the following formula (B4) (CN point is 123 ° C.) 60 parts by weight were used. Furthermore, the amount of poly(9-vinylcarbazole) as the positive C polymer was changed from 45 parts by weight to 40 parts by weight. An optically anisotropic transfer member comprising a base film and an optically anisotropic layer was produced and the optically anisotropic layer was evaluated in the same manner as in Example 1 except for the above items.

[Example 11]
Instead of 55 parts by weight of the photopolymerizable reverse wavelength dispersion liquid crystal compound represented by the formula (B4), a photopolymerizable reverse wavelength dispersion liquid crystal compound represented by the following formula (B5) (CN point is 111 ° C.) 60 parts by weight were used. Furthermore, the amount of poly(9-vinylcarbazole) as the positive C polymer was changed from 45 parts by weight to 40 parts by weight. An optically anisotropic transfer member comprising a substrate film and an optically anisotropic layer was produced and the optically anisotropic layer was evaluated in the same manner as in Example 1 except for the above items.

[Comparative Example 1]
In preparing the coating liquid, the photopolymerizable reverse wavelength dispersion liquid crystal compound represented by the formula (B1) was not used.
Further, as the base film, the same film as the unstretched film used in Example 1 except for the glass transition temperature of the resin {an unstretched film made of a resin containing an alicyclic structure-containing polymer (manufactured by Nippon Zeon Co., Ltd., resin glass transition temperature (Tg) of 126° C., thickness of 100 μm)} was used.
An optically anisotropic transfer member comprising a base film and an optically anisotropic layer was produced and the optically anisotropic layer was evaluated in the same manner as in Example 1 except for the above items.

[Comparative Example 2]
100 parts by weight of a photopolymerizable reverse wavelength dispersion liquid crystal compound (CN point is 99 ° C.) and 3 parts by weight of a photopolymerization initiator (manufactured by BASF "Irgacure 379EG") represented by the formula (B1) are mixed, and A mixed solvent of cyclopentanone and 1,3-dioxolane (weight ratio cyclopentanone:1,3-dioxolane=4:6) was added as a solvent so that the solid content was 22% by weight, and the mixture was heated to 50°C. and dissolved. The resulting mixture was filtered through a membrane filter with a pore size of 0.45 μm to obtain a coating liquid.

The surface of the unstretched film similar to that used in Example 1 was subjected to corona treatment. A silane coupling material for vertical alignment film ("DMOAP" manufactured by JNC) was applied on the surface of the corona-treated unstretched film with a bar coater and baked at 100° C. for 1 hour. As a result, a vertically oriented substrate film including the stretched film and the vertically oriented film was obtained.

A coating liquid was applied to the obtained vertically aligned substrate film using a bar coater and dried at 110° C. for 4 minutes. After that, the dried coating liquid layer was irradiated with ultraviolet rays using an ultraviolet irradiation device. This UV irradiation was carried out in a nitrogen atmosphere with the vertical alignment base film fixed to the SUS plate with a tape. The coating liquid layer was cured by irradiation with ultraviolet rays. As a result, an optically anisotropic layer was formed on the vertically oriented substrate film to obtain an optically anisotropic transfer member comprising the vertically oriented substrate film and the optically anisotropic layer. Using the optically anisotropic transfer member thus obtained, the optically anisotropic layer was evaluated by the method described above.

[Comparative Example 3]
50 parts by weight of a photopolymerizable reverse wavelength dispersion liquid crystal compound (CN point is 99° C.) represented by the formula (B1), and 6-( as a liquid crystalline monomer compound exhibiting strong vertical alignment with respect to the support film) 50 parts by weight of 4-cyanobiphenyl-4-yloxy)hexyl methacrylate (“ST03474” manufactured by DKSH) and 3 parts by weight of a photopolymerization initiator (“Irgacure379EG” manufactured by BASF) are mixed, and cyclopentanone is used as a solvent. and 1,3-dioxolane (a weight ratio of cyclopentanone:1,3-dioxolane=4:6) was added so that the solid content was 22% by weight and heated to 50° C. for dissolution. The resulting mixture was filtered through a membrane filter with a pore size of 0.45 μm to obtain a coating liquid.

The coating liquid was applied by a spin coater onto the same substrate film as used in Example 1 to form a coating liquid layer. The thickness of the coating liquid layer was adjusted so that the resulting optically anisotropic layer had a thickness of about 2.5 μm.

After that, the coating liquid layer is dried in an oven at 110° C. for about 4 minutes to evaporate the solvent in the coating liquid layer, and at the same time, the liquid crystal compound contained in the coating liquid layer is applied to the surface of the base film. oriented vertically.

After that, the coating liquid layer was irradiated with ultraviolet rays using an ultraviolet irradiation device. This ultraviolet irradiation was performed in a nitrogen atmosphere with the base film fixed to the SUS plate with a tape. The coating liquid layer was cured by irradiation with ultraviolet rays. As a result, an optically anisotropic layer was formed on the base film to obtain an optically anisotropic transfer member comprising the base film and the optically anisotropic layer. Using the optically anisotropic transfer member thus obtained, the optically anisotropic layer was evaluated by the method described above.

[Comparative Example 4]
Instead of the photopolymerizable reverse wavelength dispersion liquid crystal compound represented by formula (B1), a photopolymerizable forward wavelength dispersion liquid crystal compound (CN point: 66° C.) represented by formula (C1) was used. An optically anisotropic transfer member comprising a base film and an optically anisotropic layer was produced and the optically anisotropic layer was evaluated in the same manner as in Example 1 except for the above items.

[result]
The results of the Examples and Comparative Examples described above are shown in Tables 2 to 4 below. In Tables 2 to 4, abbreviations have the following meanings.
Unstretched film: An unstretched film made of a resin containing an alicyclic structure-containing polymer.
Obliquely stretched film: An obliquely stretched film made of a resin containing an alicyclic structure-containing polymer.
Positive A film: Multilayer film comprising a support film and a retardation layer.
PVC: poly(9-vinylcarbazole).
PFDE: A copolymer of diisopropyl fumarate and cinnamate.
Compound B1: A reverse wavelength dispersion liquid crystal compound represented by the formula (B1).
Compound B2: A reverse wavelength dispersion liquid crystal compound represented by the formula (B2).
Compound C1: a compound represented by the above formula (C1).
Compound ratio: the ratio of compound 1 in the total solid content of the coating liquid.
Blend coating: Film formation by coating a coating liquid containing a positive C polymer and Compound 1.
Polymer coating: Film formation by coating a coating solution containing a positive C polymer and not containing Compound 1.
Coating onto alignment film: Film formation by coating a coating liquid containing compound 1 and not containing positive C polymer onto alignment film.
Vertical alignment agent coating: Film formation by coating a coating liquid containing compound 1 and a liquid crystalline monomer compound exhibiting strong vertical alignment, but not containing a positive C polymer.
Positive C: Refractive indices nx(A), ny(A) and nz(A) satisfy nz(A)>nx(A)≧ny(A).
Wavelength dispersion: Wavelength dispersion of retardation Rth in the thickness direction.

In the surface state evaluation in Comparative Examples 2 and 3, the molecules of the liquid crystal compound in the optically anisotropic layer were aligned perpendicularly to the surface of the substrate film, but the tilt angle of the molecules of the liquid crystal compound was uneven. and the optically anisotropic layer was cloudy.

As can be seen from Comparative Example 3, it was difficult for the reverse wavelength dispersion liquid crystal compound to obtain a liquid crystal layer with uniform alignment even when a liquid crystalline monomer compound exhibiting strong vertical alignment with respect to the support film was used. This is in contrast to the fact that a normal wavelength dispersion liquid crystal compound can generally form a liquid crystal layer with uniform light distribution when combined with a liquid crystalline monomer compound that exhibits strong vertical alignment with respect to a support film. is.

In addition, as can be seen from Comparative Example 2, even if an alignment film is used for the reverse wavelength dispersion liquid crystal compound, if the compatibility between the alignment film and the reverse wavelength dispersion liquid crystal compound is not adjusted, liquid crystals with uniform alignment can be obtained. It was difficult to get layers. Therefore, even if an attempt was made to obtain a positive C film from a liquid crystal layer containing a reverse wavelength dispersion liquid crystal compound oriented parallel to the thickness direction, it was difficult to achieve the positive C film by the conventional manufacturing method.

On the other hand, in Examples 1 to 5, 7 and 8, a liquid crystal layer with uniform alignment can be obtained as an optically anisotropic layer by combining a reverse wavelength dispersion liquid crystal compound and a positive C polymer. , this optically anisotropic layer can function as a positive C film.

Therefore, from the above examples, it can be seen that the present invention provides an optically anisotropic layer that can be produced without using an alignment film and that can be used as a positive C plate exhibiting reverse wavelength dispersion in retardation Rth in the thickness direction. It was confirmed that it can be realized.

REFERENCE SIGNS LIST 100 organic EL display device 110 organic EL element 120 optically anisotropic laminate 121 retardation layer 122 optically anisotropic layer 130 linear polarizer 200 organic EL display device 210 organic EL element 220 λ/4 wavelength plate 230 linear polarizer 240 Optically anisotropic laminate 241 Retardation layer 242 Optically anisotropic layer 300 Liquid crystal display device 310 Light source 320 Light source side linear polarizer 330 Liquid crystal cell 340 Viewer side linear polarizer 350 Optically anisotropic laminate 351 Retardation layer 352 Optics anisotropic layer

Claims (19)

An optically anisotropic layer containing a polymer and compound 1 whose orientation state may be fixed,
When the polymer film is formed by a coating method using a solution of the polymer, the polymer has a refractive index nx(P) in a direction that is an in-plane direction of the film and provides a maximum refractive index. , the refractive index ny(P) in the in-plane direction of the film and in the direction perpendicular to the nx(P) direction, and the refractive index nz(P) in the thickness direction of the film are nz(P) >nx(P)≧ny(P),
a refractive index nx(A) in the in-plane direction of the optically anisotropic layer and in the direction giving the maximum refractive index; the refractive index ny(A) in the perpendicular direction and the refractive index nz(A) in the thickness direction of the optically anisotropic layer satisfy nz(A)>nx(A)≧ny(A);
The thickness direction retardation Rth (A450) of the optically anisotropic layer at a wavelength of 450 nm, the thickness direction retardation Rth (A550) of the optically anisotropic layer at a wavelength of 550 nm, and the optical anisotropy at a wavelength of 650 nm The thickness direction retardation Rth (A650) of the layer is represented by the following formulas (1) and (2):
0.50<Rth(A450)/Rth(A550)<1.00 (1)
1.00≦Rth(A650)/Rth(A550)<1.25 (2)
wherein the compound 1 is a compound represented by Formula (Ia), a compound represented by Formula (Ib), or a mixture thereof, an optically anisotropic layer:

however,
Ga represents ^a divalent organic group having 1 to 30 carbon atoms which may have a substituent,
Y ^a is a chemical single bond, -O-, -C(=O)-, -C(=O)-O-, -OC(=O)-, -OC(=O) -O-, -C(=O)-S-, -S-C(=O)-, -NR ¹¹ -C(=O)-, -C(=O)-NR ¹¹ -, -O-C (=O)-NR ¹¹ -, -NR ¹¹ -C(=O)-O-, -S-, -N=N-, or -C≡C-, where R ¹¹ has 1 to 1 carbon atoms represents an alkyl group of 6,
Fx ¹ and Fx ² each independently represent an organic group having at least one of an aromatic hydrocarbon ring and an aromatic heterocyclic ring;
Q represents a hydrogen atom or an optionally substituted alkyl group having 1 to 6 carbon atoms,
R ^I to R ^IV each independently represents a hydrogen atom; a halogen atom; an alkyl group having 1 to 6 carbon atoms; a cyano group; a nitro group; a halogenated alkyl group having 1 to 6 carbon atoms; Alkoxy group; —OCF ₃ ; —C(=O)—OR ^a ; or —OC(=O)—R ^a , where R ^a is the number of carbon atoms which may have a substituent 1 to 20 alkyl groups, optionally substituted C 2 to 20 alkenyl groups, optionally substituted C 3 to 12 cycloalkyl groups, or substituted represents an aromatic hydrocarbon ring group having 6 to 12 carbon atoms which may be
R ⁰ is a halogen atom; an alkyl group having 1 to 6 carbon atoms; a cyano group; a nitro group; a halogenated alkyl group having ₁ to 6 carbon atoms; O)—O—R ^a ; or —O—C(=O)—R ^a ,
p represents an integer of 0 to 3,
p1 represents an integer from 0 to 4,
p2 represents 0 or 1,
Y ¹ to Y ⁸ are each independently a chemical single bond, -O-, -O-CH ₂ -, -CH ₂ -O-, -O-CH ₂ -CH ₂ -, -CH ₂ - CH ₂ -O-, -C(=O)-O-, -OC(=O)-, -OC(=O)-O-, -C(=O)-S-, -S -C(=O)-, -NR ¹³ -C(=O)-, -C(=O)-NR ¹³ -, -CF ₂ -O-, -O-CF ₂ -, -CH ₂ -CH ₂ -, -CF ₂ -CF ₂ -, -O-CH ₂ -CH ₂ -O-, -CH=CH-C(=O)-O-, -O-C(=O)-CH=CH-, -CH ₂ -C(=O)-O-, -OC(=O)-CH ₂ -, -CH ₂ -O-C(=O)-, -C(=O)-O-CH ₂ -, -CH ₂ -CH ₂ -C(=O)-O-, -OC(=O)-CH ₂ -CH ₂ -, -CH ₂ -CH ₂ -OC(=O)-, -C(=O)-O-CH ₂ -CH ₂ -, -CH=CH-, -N=CH-, -CH=N-, -N=C(CH ₃ )-, -C(CH ₃ ) =N-, -N=N-, or -C≡C-, R ¹³ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms,
A ¹ and A ² and B ¹ and B ² each independently represent an optionally substituted cyclic aliphatic group or an optionally substituted aromatic group,
G ¹ and G ² are each independently a divalent aliphatic hydrocarbon group having 1 to 30 carbon atoms and a —CH ₂ — included in a divalent aliphatic hydrocarbon group having 3 to 30 carbon atoms. at least one of -O-, -S-, -OC(=O)-, -C(=O)-O-, -OC(=O)-O-, -NR ¹⁴ -C (=O)-, -C(=O)-NR ¹⁴ -, -NR ¹⁴ -, or an organic group substituted with -C(=O)-, with the proviso that -O- or R ¹⁴ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, except when two or more -S- are interposed adjacently,
P ¹ and P ² each independently represent an optionally substituted alkenyl group having 2 to 10 carbon atoms,
n and m are each independently 0 or 1; 2. The optically anisotropic layer according to claim 1, wherein said compound 1 is a compound represented by any one of the following formulas (B1) to (B5).

3. The optically anisotropic layer according to claim 1, wherein the polymer is at least one polymer selected from the group consisting of polyvinylcarbazole, polyfumarate and cellulose derivatives. 4. The optically anisotropic layer according to claim 1, wherein the ratio of said compound 1 in the total solid content of said optically anisotropic layer is 40% by weight to 70% by weight. The in-plane retardation Re (A590) of the optically anisotropic layer at a wavelength of 590 nm and the thickness direction retardation Rth (A590) of the optically anisotropic layer at a wavelength of 590 nm are represented by the following formulas (3) and (4 ):
Re(A590)≦10 nm (3)
-200 nm ≤ Rth (A590) ≤ -10 nm (4)
The optically anisotropic layer according to any one of claims 1 to 4, which satisfies An optically anisotropic transfer member comprising a substrate and the optically anisotropic layer according to any one of claims 1 to 5. An optically anisotropic layer according to any one of claims 1 to 5 and a retardation layer,
Refractive index nx(B) in the in-plane direction of the retardation layer in the direction giving the maximum refractive index, and in the in-plane direction of the retardation layer in the direction perpendicular to the nx(B) direction An optically anisotropic laminate in which a refractive index ny(B) and a refractive index nz(B) in the thickness direction of the retardation layer satisfy nx(B)>ny(B)≧nz(B). 8. The optically anisotropic laminate according to claim 7, wherein the retardation layer is a stretched film layer containing an alicyclic structure-containing polymer. 9. The optically anisotropic laminate according to claim 8, wherein the retardation layer is an obliquely stretched film layer. The optically anisotropic laminate according to any one of claims 7 to 9, wherein the retardation layer is a stretched film layer having a multilayer structure. The in-plane retardation Re (B450) of the retardation layer at a wavelength of 450 nm, the in-plane retardation Re (B550) of the retardation layer at a wavelength of 550 nm, and the in-plane retardation Re of the retardation layer at a wavelength of 650 nm ( B650) is represented by the following formulas (5) and (6):
0.75<Re(B450)/Re(B550)<1.00 (5)
1.01<Re(B650)/Re(B550)<1.25 (6)
8. The optically anisotropic laminate according to claim 7, which satisfies: The retardation layer may have a fixed alignment state, and contains a compound 2, and the compound 2 is a compound represented by formula (IIa), a compound represented by formula (IIb), or a mixture thereof The optically anisotropic laminate according to claim 9 or 11, wherein

however,
Ga represents ^a divalent organic group having 1 to 30 carbon atoms which may have a substituent,
Y ^a is a chemical single bond, -O-, -C(=O)-, -C(=O)-O-, -OC(=O)-, -OC(=O) -O-, -C(=O)-S-, -S-C(=O)-, -NR ¹¹ -C(=O)-, -C(=O)-NR ¹¹ -, -O-C (=O)-NR ¹¹ -, -NR ¹¹ -C(=O)-O-, -S-, -N=N-, or -C≡C-, where R ¹¹ has 1 to 1 carbon atoms represents an alkyl group of 6,
Fx ¹ and Fx ² each independently represent an organic group having at least one of an aromatic hydrocarbon ring and an aromatic heterocyclic ring;
Q represents a hydrogen atom or an optionally substituted alkyl group having 1 to 6 carbon atoms,
R ^I to R ^IV each independently represents a hydrogen atom; a halogen atom; an alkyl group having 1 to 6 carbon atoms; a cyano group; a nitro group; a halogenated alkyl group having 1 to 6 carbon atoms; Alkoxy group; —OCF ₃ ; —C(=O)—OR ^a ; or —OC(=O)—R ^a , where R ^a is the number of carbon atoms which may have a substituent 1 to 20 alkyl groups, optionally substituted C 2 to 20 alkenyl groups, optionally substituted C 3 to 12 cycloalkyl groups, or substituted represents an aromatic hydrocarbon ring group having 6 to 12 carbon atoms which may be
R ⁰ is a halogen atom; an alkyl group having 1 to 6 carbon atoms; a cyano group; a nitro group; a halogenated alkyl group having ₁ to 6 carbon atoms; O)—O—R ^a ; or —O—C(=O)—R ^a ,
p represents an integer of 0 to 3,
p1 represents an integer from 0 to 4,
p2 represents 0 or 1,
Y ¹ to Y ⁸ are each independently a chemical single bond, -O-, -O-CH ₂ -, -CH ₂ -O-, -O-CH ₂ -CH ₂ -, -CH ₂ - CH ₂ -O-, -C(=O)-O-, -OC(=O)-, -OC(=O)-O-, -C(=O)-S-, -S -C(=O)-, -NR ¹³ -C(=O)-, -C(=O)-NR ¹³ -, -CF ₂ -O-, -O-CF ₂ -, -CH ₂ -CH ₂ -, -CF ₂ -CF ₂ -, -O-CH ₂ -CH ₂ -O-, -CH=CH-C(=O)-O-, -O-C(=O)-CH=CH-, -CH ₂ -C(=O)-O-, -OC(=O)-CH ₂ -, -CH ₂ -O-C(=O)-, -C(=O)-O-CH ₂ -, -CH ₂ -CH ₂ -C(=O)-O-, -OC(=O)-CH ₂ -CH ₂ -, -CH ₂ -CH ₂ -OC(=O)-, -C(=O)-O-CH ₂ -CH ₂ -, -CH=CH-, -N=CH-, -CH=N-, -N=C(CH ₃ )-, -C(CH ₃ ) =N-, -N=N-, or -C≡C-, R ¹³ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms,
A ¹ and A ² and B ¹ and B ² each independently represent an optionally substituted cyclic aliphatic group or an optionally substituted aromatic group,
G ¹ and G ² are each independently a divalent aliphatic hydrocarbon group having 1 to 30 carbon atoms and a —CH ₂ — included in a divalent aliphatic hydrocarbon group having 3 to 30 carbon atoms. at least one of -O-, -S-, -OC(=O)-, -C(=O)-O-, -OC(=O)-O-, -NR ¹⁴ -C (=O)-, -C(=O)-NR ¹⁴ -, -NR ¹⁴ -, or an organic group substituted with -C(=O)-, with the proviso that -O- or R ¹⁴ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, except when two or more -S- are interposed adjacently,
P ¹ and P ² each independently represent an optionally substituted alkenyl group having 2 to 10 carbon atoms,
n and m are each independently 0 or 1; The in-plane retardation Re (B590) of the retardation layer at a wavelength of 590 nm, the in-plane retardation Re (A590) of the optically anisotropic layer at a wavelength of 590 nm, and the thickness direction of the optically anisotropic layer at a wavelength of 590 nm. The retardation Rth (A590) of the following formulas (7), (8) and (9):
110nm≦Re(B590)≦170nm (7)
Re(A590)≦10 nm (8)
-110 nm ≤ Rth (A590) ≤ -20 nm (9)
The optically anisotropic laminate according to any one of claims 7 to 12, which satisfies a linear polarizer;
The optically anisotropic layer according to any one of claims 1 to 5, the optically anisotropic transfer member according to claim 6, or the optically anisotropic layer according to any one of claims 7 to 13. A polarizing plate, comprising: a laminate. An image display device comprising the polarizing plate according to claim 14 . an optically anisotropic laminate according to any one of claims 7 to 13;
a linear polarizer;
and an image display element, provided in this order,
An image display device, wherein the image display element is a liquid crystal cell or an organic electroluminescence element. a linear polarizer;
an optically anisotropic laminate according to any one of claims 7 to 13;
and an organic electroluminescence element in this order. a step of applying a coating liquid containing a polymer, compound 1 and a solvent onto a support surface to obtain a coating liquid layer;
A method for producing an optically anisotropic layer, comprising a step of drying the coating liquid layer,
When the polymer film is formed by a coating method using a solution of the polymer, the polymer has a refractive index nx(P) in a direction that is an in-plane direction of the film and provides a maximum refractive index. , the refractive index ny(P) in the in-plane direction of the film and in the direction perpendicular to the nx(P) direction, and the refractive index nz(P) in the thickness direction of the film are nz(P) >nx(P)≧ny(P),
a refractive index nx(A) in the in-plane direction of the optically anisotropic layer and in the direction giving the maximum refractive index; the refractive index ny(A) in the perpendicular direction and the refractive index nz(A) in the thickness direction of the optically anisotropic layer satisfy nz(A)>nx(A)≧ny(A);
The thickness direction retardation Rth (A450) of the optically anisotropic layer at a wavelength of 450 nm, the thickness direction retardation Rth (A550) of the optically anisotropic layer at a wavelength of 550 nm, and the optical anisotropy at a wavelength of 650 nm The thickness direction retardation Rth (A650) of the layer is represented by the following formulas (1) and (2):
0.50<Rth(A450)/Rth(A550)<1.00 (1)
1.00≦Rth(A650)/Rth(A550)<1.25 (2)
and the compound 1 is a compound represented by formula (Ia), a compound represented by formula (Ib), or a mixture thereof:

however,
Ga represents ^a divalent organic group having 1 to 30 carbon atoms which may have a substituent,
Y ^a is a chemical single bond, -O-, -C(=O)-, -C(=O)-O-, -OC(=O)-, -OC(=O) -O-, -C(=O)-S-, -S-C(=O)-, -NR ¹¹ -C(=O)-, -C(=O)-NR ¹¹ -, -O-C (=O)-NR ¹¹ -, -NR ¹¹ -C(=O)-O-, -S-, -N=N-, or -C≡C-, where R ¹¹ has 1 to 1 carbon atoms represents an alkyl group of 6,
Fx ¹ and Fx ² each independently represent an organic group having at least one of an aromatic hydrocarbon ring and an aromatic heterocyclic ring;
Q represents a hydrogen atom or an optionally substituted alkyl group having 1 to 6 carbon atoms,
R ^I to R ^IV each independently represents a hydrogen atom; a halogen atom; an alkyl group having 1 to 6 carbon atoms; a cyano group; a nitro group; a halogenated alkyl group having 1 to 6 carbon atoms; Alkoxy group; —OCF ₃ ; —C(=O)—OR ^a ; or —OC(=O)—R ^a , where R ^a is the number of carbon atoms which may have a substituent 1 to 20 alkyl groups, optionally substituted C 2 to 20 alkenyl groups, optionally substituted C 3 to 12 cycloalkyl groups, or substituted represents an aromatic hydrocarbon ring group having 6 to 12 carbon atoms which may be
R ⁰ is a halogen atom; an alkyl group having 1 to 6 carbon atoms; a cyano group; a nitro group; a halogenated alkyl group having ₁ to 6 carbon atoms; O)—O—R ^a ; or —O—C(=O)—R ^a ,
p represents an integer of 0 to 3,
p1 represents an integer from 0 to 4,
p2 represents 0 or 1,
Y ¹ to Y ⁸ are each independently a chemical single bond, -O-, -O-CH ₂ -, -CH ₂ -O-, -O-CH ₂ -CH ₂ -, -CH ₂ - CH ₂ -O-, -C(=O)-O-, -OC(=O)-, -OC(=O)-O-, -C(=O)-S-, -S -C(=O)-, -NR ¹³ -C(=O)-, -C(=O)-NR ¹³ -, -CF ₂ -O-, -O-CF ₂ -, -CH ₂ -CH ₂ -, -CF ₂ -CF ₂ -, -O-CH ₂ -CH ₂ -O-, -CH=CH-C(=O)-O-, -O-C(=O)-CH=CH-, -CH ₂ -C(=O)-O-, -OC(=O)-CH ₂ -, -CH ₂ -O-C(=O)-, -C(=O)-O-CH ₂ -, -CH ₂ -CH ₂ -C(=O)-O-, -OC(=O)-CH ₂ -CH ₂ -, -CH ₂ -CH ₂ -OC(=O)-, -C(=O)-O-CH ₂ -CH ₂ -, -CH=CH-, -N=CH-, -CH=N-, -N=C(CH ₃ )-, -C(CH ₃ ) =N-, -N=N-, or -C≡C-, R ¹³ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms,
A ¹ and A ² and B ¹ and B ² each independently represent an optionally substituted cyclic aliphatic group or an optionally substituted aromatic group,
G ¹ and G ² are each independently a divalent aliphatic hydrocarbon group having 1 to 30 carbon atoms and a —CH ₂ — included in a divalent aliphatic hydrocarbon group having 3 to 30 carbon atoms. at least one of -O-, -S-, -OC(=O)-, -C(=O)-O-, -OC(=O)-O-, -NR ¹⁴ -C (=O)-, -C(=O)-NR ¹⁴ -, -NR ¹⁴ -, or an organic group substituted with -C(=O)-, with the proviso that -O- or R ¹⁴ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, except when two or more -S- are interposed adjacently,
P ¹ and P ² each independently represent an optionally substituted alkenyl group having 2 to 10 carbon atoms,
n and m are each independently 0 or 1; a step of laminating the optically anisotropic layer of the optically anisotropic transfer material according to claim 6 and a retardation layer;
A method for manufacturing an optically anisotropic laminate, comprising:
Refractive index nx(B) in the in-plane direction of the retardation layer in the direction giving the maximum refractive index, and in the in-plane direction of the retardation layer in the direction perpendicular to the nx(B) direction Manufacturing an optically anisotropic laminate in which the refractive index ny(B) and the refractive index nz(B) in the thickness direction of the retardation layer satisfy nx(B)>ny(B)≧nz(B) Method.

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