JP2021523422A - 偏光板、その製造方法およびこれを含む画像表示装置 - Google Patents
偏光板、その製造方法およびこれを含む画像表示装置 Download PDFInfo
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- JP2021523422A JP2021523422A JP2021513743A JP2021513743A JP2021523422A JP 2021523422 A JP2021523422 A JP 2021523422A JP 2021513743 A JP2021513743 A JP 2021513743A JP 2021513743 A JP2021513743 A JP 2021513743A JP 2021523422 A JP2021523422 A JP 2021523422A
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- Prior art keywords
- polarizing plate
- protective layer
- polarizer
- base material
- low moisture
- Prior art date
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- Granted
Links
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Images
Classifications
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- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/03—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
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Abstract
Description
強度係数(Mpa×μm)=保護層の貯蔵弾性率×保護層の厚さ
収縮係数(N×μm)=低透湿基材層の収縮力×低透湿基材層の厚さ
<製造例1:保護層形成用組成物1の製造>
エポキシ化合物として3,4−エポキシシクロヘキシルメチル−3’,4’−エポキシシクロヘキサンカルボキシレート(商品名セロキサイド−2021)65重量部、1,4−シクロヘキシルジメタノールジグリシジルエーテル(CHDMDGE)15重量部、およびオキセタン化合物として3−エチル−3−[(3−エチルオキセタン−3−イル)メトキシメチル]オキセタン(東亜合成社のアロンオキセタンOXT−221)20重量部を混合して混合物を製造し、前記混合物100重量部に対して、光開始剤(商品名:Irgacure250)3重量部および光増感剤(商品名:ESACURE ITX)1重量部を添加して、保護層形成用組成物1を製造した。
エポキシ化合物として3,4−エポキシシクロヘキシルメチル−3’,4’−エポキシシクロヘキサンカルボキシレート(商品名セロキサイド−2021)42重量部、1,4−シクロヘキシルジメタノールジグリシジルエーテル(CHDMDGE)28重量部、およびオキセタン化合物として3−エチル−3−[(3−エチルオキセタン−3−イル)メトキシメチル]オキセタン(東亜合成社のアロンオキセタンOXT−221)30重量部を混合して混合物を製造し、前記混合物100重量部に対して、光開始剤(商品名:Irgacure250)3重量部および光増感剤(商品名:ESACURE ITX)1重量部を添加して、保護層形成用組成物2を製造した。
エポキシ化合物として3,4−エポキシシクロヘキシルメチル−3’,4’−エポキシシクロヘキサンカルボキシレート(商品名セロキサイド−2021)80重量部、およびオキセタン化合物として3−エチル−3−[(3−エチルオキセタン−3−イル)メトキシメチル]オキセタン(東亜合成社のアロンオキセタンOXT−221)20重量部を混合して混合物を製造し、前記混合物100重量部に対して、光開始剤(商品名:Irgacure250)3重量部および光増感剤(商品名:ESACURE ITX)1重量部を添加して、保護層形成用組成物3を製造した。
<比較例1:偏光板の製造>
偏光子(厚さ17μmのポリビニルアルコール系延伸フィルム、製造会社:日本合成社)の一面に接着剤組成物を塗布し、低透湿基材層(厚さ80μmのポリエチレンテレフタレートフィルム、日本東洋紡社製)をラミネートした。次いで、前記偏光子の低透湿基材層が積層されていない面に前記保護層形成用組成物1を塗布し、ラミネートして偏光板を製造した。その後、フュージョンランプ(Fusion lamp)を用いて、紫外線を照射して保護層形成用組成物および接着剤を硬化させて偏光板を製造した。このとき、保護層の厚さは4.1μmであった。
前記比較例1において、保護層形成用組成物1の代わりに保護層形成用組成物2を用い、保護層の厚さを4.5〜5μmに変更した以外は、比較例1と同様の方法で偏光板を製造した。
偏光子(厚さ17μmのポリビニルアルコール系延伸フィルム、製造会社:日本合成社)の一面に接着剤組成物を塗布し、低透湿基材(厚さ60μmのポリエチレンテレフタレートフィルム、日本東洋紡社製)をラミネートした。次いで、前記偏光子の低透湿基材層が積層されていない面に前記保護層形成用組成物1を塗布し、ラミネートして偏光板を製造した。その後、フュージョンランプ(Fusion lamp)を用いて、紫外線を照射して保護層形成用組成物および接着剤を硬化させて偏光板を製造した。このとき、保護層の厚さは5.9μmであった。
前記参考例2において、60μmの低透湿基材の代わりに80μmの低透湿基材に変更した以外は、参考例2と同様の方法で偏光板を製造した。
前記比較例1において、保護層の厚さを4.5〜5μmに変更した以外は、比較例1と同様の方法で偏光板を製造した。
前記比較例1において、保護層の厚さを5.9μmに変更した以外は、比較例1と同様の方法で偏光板を製造した。
前記比較例1において、保護層の厚さを6.5μmに変更した以外は、比較例1と同様の方法で偏光板を製造した。
前記比較例1において、保護層形成用組成物1の代わりに保護層形成用組成物3を用い、保護層の厚さを4.5〜5μmに変更した以外は、比較例1と同様の方法で偏光板を製造した。
偏光板に対して高温耐久性を評価する実験を行った。厚さ2.7T、対角線の長さ55インチ以上のガラスの上面および下面に粘着剤を介在して偏光板を付着させた。
前記製造された偏光板を32インチの0.7Tの厚さのガラスの上面および下面にそれぞれ付着させて積層体を製造した。前記積層体を60℃の温度のチャンバ内に72時間投入した後、取り出して24時間経過時点で平面度の変化量を測定した。用語、平面度は、上部偏光板側に最も多く反った部分と、下部偏光板側に最も多く反った部分との差値であり、前記平面度は、Dukin社の3D測定装置を用いて測定した。一方、測定時の結果を図6(参考例2)、図7(参考例3)および図8(実施例4)に示した。
初期反り:低透湿基材層の貼り合わせ直後の、25℃、RH50%環境で測定
後期反り:低透湿基材層の貼り合わせ後、60℃のチャンバ内に72時間放置後、チャンバの外部で25℃、RH50%環境で2時間放置した後に測定
前記製造例1で製造された保護層形成用組成物1〜3に対して工程性テストを行った。偏光子の一面に前記保護層形成用組成物を塗布し、0.4Mpaのラミネート圧でラミネートし、このときのフィルムの供給速度は18m/minであり、形成される保護層の厚さを偏光板の中心(Center)とサイド部分(Side)に対して測定した後、これを記した。
20:保護層
30:低透湿基材層
40:粘着層
100:偏光板
200:液晶パネル
Claims (15)
- 偏光子と、
前記偏光子の一面に備えられた低透湿基材層と、
前記偏光子の他面に備えられた保護層とを含み、
前記保護層の厚さは、4.5μm以上10μm以下であり、
前記保護層は、エポキシ化合物およびオキセタン化合物を含む活性エネルギー線硬化型組成物またはその硬化物を含む樹脂層である、偏光板。 - 前記保護層の下記数式1で表される強度係数値が6,750以上60,000以下である、請求項1に記載の偏光板:
[数式1]
強度係数(Mpa×μm)=保護層の貯蔵弾性率×保護層の厚さ
前記数式1中、前記保護層の貯蔵弾性率は、温度区間−10℃〜160℃、昇温速度5℃/min、歪み(strain)10%の測定条件における、80℃の貯蔵弾性率を意味する。 - 下記数式2で表される収縮係数値が60以上900以下である、請求項1または2に記載の偏光板:
[数式2]
収縮係数(N×μm)=低透湿基材層の収縮力×低透湿基材層の厚さ
前記数式2中、前記低透湿基材層の収縮力は、温度80℃で2時間放置後の、TD方向への収縮力を意味する。 - 前記保護層の温度区間−10℃〜160℃、昇温速度5℃/min、歪み(strain)10%の測定条件における、80℃の貯蔵弾性率は、1,200Mpa以上10,000Mpa以下である、請求項1〜3のいずれか一項に記載の偏光板。
- 前記保護層の厚さが4.5μm以上8.5μm以下である、請求項1〜4のいずれか一項に記載の偏光板。
- 前記低透湿基材層の温度80℃で2時間放置時の、TD方向への収縮力が1N以上10N以下である、請求項1〜5のいずれか一項に記載の偏光板。
- 前記低透湿基材層の厚さは、40μm以上100μm以下である、請求項1〜6のいずれか一項に記載の偏光板。
- 前記低透湿基材層の水分透過率が60g/m2/day以下である、請求項1〜7のいずれか一項に記載の偏光板。
- 前記保護層および前記低透湿基材層の厚さの比率が1:3〜1:20である、請求項1〜8のいずれか一項に記載の偏光板。
- 前記偏光板の温度80℃で2時間放置時の、MD方向またはTD方向への収縮力が5N以上10N以下である、請求項1〜9のいずれか一項に記載の偏光板。
- 前記偏光板を80℃で1,000時間放置した時、偏光子に生成されるクラックの長さが5.0mm以下である、請求項1〜10のいずれか一項に記載の偏光板。
- 前記エポキシ化合物およびオキセタン化合物の重量比が9:1〜1:9である、請求項1〜11のいずれか一項に記載の偏光板。
- 偏光子を用意するステップと、
前記偏光子の一面に低透湿基材層を備えるステップと、
前記偏光子の他面に保護層を形成するステップとを含む、請求項1〜12のいずれか1項に記載の偏光板の製造方法。 - 前記保護層を形成するステップは、偏光子の他面に活性エネルギー線硬化型組成物を塗布し、これを硬化させるステップを含み、
前記活性エネルギー線硬化型組成物の粘度は、25℃で50cPs〜200cPsである、請求項13に記載の偏光板の製造方法。 - 液晶パネルと、
前記液晶パネルの上面に備えられた第1偏光板と、
前記液晶パネルの下面に備えられた第2偏光板とを含み、
前記第1偏光板および第2偏光板は、前記請求項1〜12のいずれか1項に記載の偏光板である、画像表示装置。
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KR20190135433A (ko) | 2019-12-06 |
EP3805825A1 (en) | 2021-04-14 |
KR102290865B1 (ko) | 2021-08-23 |
TWI706176B (zh) | 2020-10-01 |
TW202004234A (zh) | 2020-01-16 |
CN112088324B (zh) | 2022-07-19 |
JP7284809B2 (ja) | 2023-05-31 |
EP3805825A4 (en) | 2021-06-23 |
WO2019231213A1 (ko) | 2019-12-05 |
CN112088324A (zh) | 2020-12-15 |
US20210240017A1 (en) | 2021-08-05 |
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