JP2020064280A5

JP2020064280A5 -

Info

Publication number: JP2020064280A5
Application number: JP2019115124A
Authority: JP
Filing date: 2019-06-21
Publication date: 2022-04-06
Anticipated expiration: 2039-06-21

Claims

二色性物質を含むポリビニルアルコール系樹脂フィルムで構成され、その厚みが８μｍ以下であり、単体透過率が４８％以上であり、偏光度が８５％以上である偏光膜と該偏光膜の少なくとも一方の側に保護層とを含む偏光板と、液晶化合物の配向固化層である位相差層と、を有する位相差層付偏光板の製造方法であって、
長尺状の熱可塑性樹脂基材の片側に、ヨウ化物または塩化ナトリウムとポリビニルアルコール系樹脂とを含むポリビニルアルコール系樹脂層を形成して積層体とすること、および、該積層体に、空中補助延伸処理と、染色処理と、水中延伸処理と、長手方向に搬送しながら加熱することにより幅方向に２％以上収縮させる乾燥収縮処理と、をこの順に施すことを含む作製方法によって、該偏光膜を作製することを含む、
位相差層付偏光板の製造方法。 A polarizing film having a thickness of 8 μm or less, a single transmittance of 48% or more, and a degree of polarization of 85% or more, and at least one of the polarizing films, which is composed of a polyvinyl alcohol-based resin film containing a dichroic substance. A method for manufacturing a polarizing plate with a retardation layer, which comprises a polarizing plate including a protective layer on the side of the surface and a retardation layer which is an orientation-solidifying layer of a liquid crystal compound .
A polyvinyl alcohol-based resin layer containing iodide or sodium chloride and a polyvinyl alcohol-based resin is formed on one side of a long thermoplastic resin base material to form a laminated body, and the laminated body is assisted in the air. The polarizing film is produced by a production method including a stretching treatment, a dyeing treatment, an underwater stretching treatment, and a drying shrinkage treatment of shrinking by 2% or more in the width direction by heating while transporting in the longitudinal direction. Including making
A method for manufacturing a polarizing plate with a retardation layer.

総厚みが６０μｍ以下である位相差層付偏光板の製造方法であって、請求項１に記載の位相差層付偏光板の製造方法。 The method for manufacturing a polarizing plate with a retardation layer, which has a total thickness of 60 μm or less, according to claim 1 .

前記位相差層が液晶化合物の配向固化層の単一層であり、
該位相差層のＲｅ（５５０）が１００ｎｍ～１９０ｎｍであり、
該位相差層の遅相軸と前記偏光膜の吸収軸とのなす角度が４０°～５０°である、
請求項１または２に記載の位相差層付偏光板の製造方法。 The retardation layer is a single layer of the alignment solidification layer of the liquid crystal compound.
The Re (550) of the retardation layer is 100 nm to 190 nm.
The angle formed by the slow axis of the retardation layer and the absorption axis of the polarizing film is 40 ° to 50 °.
The method for manufacturing a polarizing plate with a retardation layer according to claim 1 or 2 .

前記位相差層が、第１の液晶化合物の配向固化層と第２の液晶化合物の配向固化層との積層構造を有し、
該第１の液晶化合物の配向固化層のＲｅ（５５０）が２００ｎｍ～３００ｎｍであり、その遅相軸と前記偏光膜の吸収軸とのなす角度が１０°～２０°であり、
該第２の液晶化合物の配向固化層のＲｅ（５５０）が１００ｎｍ～１９０ｎｍであり、その遅相軸と該偏光膜の吸収軸とのなす角度が７０°～８０°である、
請求項１または２に記載の位相差層付偏光板の製造方法。 The retardation layer has a laminated structure of an oriented solidified layer of a first liquid crystal compound and an oriented solidified layer of a second liquid crystal compound.
The Re (550) of the oriented solidified layer of the first liquid crystal compound is 200 nm to 300 nm, and the angle formed by the slow axis thereof and the absorption axis of the polarizing film is 10 ° to 20 °.
The Re (550) of the oriented solidified layer of the second liquid crystal compound is 100 nm to 190 nm, and the angle between the slow axis thereof and the absorption axis of the polarizing film is 70 ° to 80 °.
The method for manufacturing a polarizing plate with a retardation layer according to claim 1 or 2 .

前記偏光膜の５０ｃｍ^２の領域内における単体透過率の最大値と最小値との差が０．５％以下である、請求項１から４のいずれかに記載の位相差層付偏光板の製造方法。 The manufacture of a polarizing plate with a retardation layer according to any one of claims 1 to 4 , wherein the difference between the maximum value and the minimum value of the single transmittance in the region of 50 cm ² of the polarizing film is 0.5% or less. Method .

前記偏光膜の幅が１０００ｍｍ以上であり、幅方向に沿った位置における単体透過率の最大値と最小値との差が１％以下である、請求項１から４のいずれかに記載の位相差層付偏光板の製造方法。 The phase difference according to any one of claims 1 to 4 , wherein the width of the polarizing film is 1000 mm or more, and the difference between the maximum value and the minimum value of the single transmittance at a position along the width direction is 1% or less. A method for manufacturing a layered polarizing plate.

前記偏光膜の単体透過率が５０％以下であり、偏光度が９２％以下である、請求項１から６のいずれかに記載の位相差層付偏光板の製造方法。 The method for manufacturing a polarizing plate with a retardation layer according to any one of claims 1 to 6 , wherein the single-unit transmittance of the polarizing film is 50% or less and the degree of polarization is 92% or less.

前記位相差層付偏光板が、前記位相差層の外側に別の位相差層をさらに有する位相差層付偏光板であって、
前記位相差層の外側に該別の位相差層を設けることを含み、
該別の位相差層の屈折率特性がｎｚ＞ｎｘ＝ｎｙの関係を示す、請求項１から７のいずれかに記載の位相差層付偏光板の製造方法。 The polarizing plate with a retardation layer is a polarizing plate with a retardation layer having another retardation layer outside the retardation layer.
Including providing the other retardation layer on the outside of the retardation layer.
The method for manufacturing a polarizing plate with a retardation layer according to any one of claims 1 to 7 , wherein the refractive index characteristic of the other retardation layer indicates a relationship of nz> nz = ny.

前記位相差層付偏光板が、前記位相差層の外側に導電層または導電層付等方性基材をさらに有する位相差層付偏光板であって、
前記位相差層の外側に該導電層または該導電層付等方性基材を設けることを含む、請求項１から８のいずれかに記載の位相差層付偏光板の製造方法。
The polarizing plate with a retardation layer is a polarizing plate with a retardation layer having a conductive layer or an isotropic substrate with a conductive layer on the outside of the retardation layer.
The method for manufacturing a polarizing plate with a retardation layer according to any one of claims 1 to 8 , further comprising providing the conductive layer or an isotropic substrate with the conductive layer on the outside of the retardation layer.