JP2023090732A - 光硬化性樹脂組成物、画像表示装置、及び画像表示装置の製造方法 - Google Patents
光硬化性樹脂組成物、画像表示装置、及び画像表示装置の製造方法 Download PDFInfo
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Abstract
Description
本実施の形態に係る光硬化性樹脂組成物は、硬化後の厚さ0.3mmのときの透湿度が、40℃、相対湿度90%の環境下で400g/m2/day以上であり、好ましくは500g/m2/day以上であり、より好ましくは600g/m2/day以上であり、さらに好ましくは700g/m2/day以上である。また、光硬化性樹脂組成物の硬化後の透湿度の上限は、特に限定されないが、例えば1000g/m2/day以下とすることができる。ここで、透湿度とは、JISZ0208に準拠して、40℃、相対湿度90%の雰囲気で測定した透湿度をいう。このような構成の光硬化性樹脂組成物を用いることにより、高温環境下で、例えば図1に示す画像表示装置1における偏光板2の変色を抑制できる。
反応率(%)=[(X-Y)/X]×100
(メタ)アクリレート樹脂は、1分子中に2つ以上の(メタ)アクリロイル基を有する、光硬化性の樹脂(重合体)である。(メタ)アクリレート樹脂は、相溶性の観点から、ポリエーテル系ウレタン(メタ)アクリレート樹脂及びポリエステル系ウレタン(メタ)アクリレート樹脂の少なくとも1種を含有することが好ましい。(メタ)アクリレート樹脂は、ポリマーであってもよいし、オリゴマーであってもよい。
単官能モノマーは、例えば光硬化性の(メタ)アクリレートモノマーである。また、単官能モノマーは、光硬化性樹脂組成物の硬化物の透湿度を高くする観点、及び他の成分との相溶性の観点から、水酸基含有(メタ)アクリレートモノマー及びヘテロ環含有(メタ)アクリレートモノマーの少なくとも1種を含有することが好ましい。
光重合開始剤は、光ラジカル重合開始剤を用いることが好ましく、アルキルフェノン系光重合開始剤、及びアシルフォスフィンオキサイド系光重合開始剤の少なくとも1種を含有することがより好ましい。アルキルフェノン系光重合開始剤としては、1-ヒドロキシシクロへキシルフェニルケトン(イルガキュア184、BASF社製)、2-ヒドロキシ-1-{4-[4-(2一ヒドロキシ-2-メチル-プロピロニル)ベンジル]フェニル}-2-メチル-1-プロパン-1-オン(イルガキュア127、BASF社製)等を用いることができる。アシルフォスフィンオキサイド系光重合開始剤としては、2,4,6-トリメチルベンゾイルジフェニルフォスフィンオキサイド(イルガキュアTPO、BASF社製)等を用いることができる。その他、光重合開始剤としては、ベンゾフェノン、アセトフェノン等を用いることもできる。
可塑剤は、例えば光照射によりそれ自身が光硬化をせず、光硬化後の硬化樹脂層に柔軟性を与えるものである。可塑剤は、他の成分との相溶性の観点から、ポリエーテル系ポリオール及びポリエステル系ポリオールの少なくとも1種を含有することが好ましい。
酸化防止剤は、例えば光硬化性樹脂組成物の変色防止の目的で用いられる。酸化防止剤は、特に限定されず、公知の酸化防止剤を用いることができる。例えば、ヒンダードフェノール構造を有する化合物、ヒンダードアミン構造を有する化合物、チオエーテル構造を有する化合物等が挙げられ、ヒンダードフェノール構造を有する化合物が好ましい。
光硬化性樹脂組成物は、高温環境下で画像表示装置における偏光板の変色を抑制する効果を損なわない範囲で、上述した成分以外の他の成分をさらに含有していてもよい。他の成分としては、例えば粘着付与剤等が挙げられる。
本実施の形態に係る画像表示装置1は、例えば図1に示すように、偏光板2を含む画像表示部材4と、硬化樹脂層6と、光透過性部材5とこの順に備える。硬化樹脂層6は、厚さ0.3mmのときの透湿度が、40℃、相対湿度90%の環境下で400g/m2/day以上である。このように透湿度が高い硬化樹脂層6を用いることにより、高温環境下で偏光板2の変色を抑制できる。
以下、画像表示装置の製造方法の具体例である第1の実施の形態、及び第2の実施の形態について説明する。なお、図面において同じ図番は同一の構成要素を表すものとする。
第1の実施の形態に係る製造方法は、光硬化性樹脂組成物を光透過性部材の表面に塗布する工程(A)と、画像表示部材と光透過性部材とを光硬化性樹脂組成物を介して貼合せる工程(B)と、光硬化性樹脂組成物を硬化させる工程(C)とを有する。
工程(A)では、例えば図3に示すように、光透過性部材5の遮光層7が形成された側の表面に、光硬化性樹脂組成物11を塗布する。光硬化性樹脂組成物11は、上述した光硬化性樹脂組成物と同義であり、好ましい範囲も同様である。
工程(B)では、例えば図4に示すように、画像表示部材4の偏光板2側に、光硬化性樹脂組成物11を介して光透過性部材5を貼合せる。これにより、偏光板2と光透過性部材5との間に光硬化性樹脂組成物層12が形成される。
工程(C)では、例えば図5に示すように、光硬化性樹脂組成物層12に対し光(好ましくは紫外線)を照射して光硬化性樹脂組成物層12を硬化させる。これにより、図1に示すように硬化樹脂層6を介して画像表示部材4と光透過性部材5とが積層した画像表示装置1が得られる。
第2の実施の形態に係る製造方法は、光硬化性樹脂組成物を光透過性部材の表面に塗布する工程(AA)と、光硬化性樹脂組成物層に光照射して仮硬化を行う工程(BB)と、画像表示部材と光透過性部材とを仮硬化樹脂層を介して貼合せる工程(CC)と、仮硬化樹脂層を本硬化させる工程(DD)とを有する。
工程(AA)では、例えば図6に示すように、光透過性部材5の表面に、光硬化性樹脂組成物11を塗布し、光硬化性樹脂組成物層12を形成する。具体的には、遮光層7の表面も含め、光透過性部材5の遮光層7が形成された側の表面全面に、光硬化性樹脂組成物11を平坦になるように塗布し、段差が生じないようにすることが好ましい。光硬化性樹脂組成物層12の厚さは、例えば、遮光層7の厚さの1.2~50倍の厚さが好ましく、2~30倍の厚さがより好ましい。光硬化性樹脂組成物11の塗布は、必要な厚さが得られるように行えばよく、1回で行ってもよいし、複数回で行ってもよい。
工程(BB)では、例えば図7に示すように、工程(AA)で形成された光硬化性樹脂組成物層12に光(好ましくは紫外線)を照射して仮硬化を行い、図8に示すように仮硬化樹脂層13を形成する。
[工程(CC)では、例えば図9に示すように、画像表示部材4に、光透過性部材5を仮硬化樹脂層13を介して貼合せる。貼合せは、例えば、公知の圧着装置を用いて、10~80℃で加圧することにより行うことができる。
工程(DD)では、例えば図10に示すように、仮硬化樹脂層13に対し光(好ましくは紫外線)を照射して本硬化させる。これにより、硬化樹脂層6を介して画像表示部材4と光透過性部材5とが積層した画像表示装置1(図1参照)が得られる。
アートレジンUN-6202:ポリエーテル骨格ウレタンアクリレートオリゴマー、根上工業社製
アートレジンUN-7700:ポリエステル骨格ウレタンアクリレートオリゴマー、根上工業社製
TE-2000:ポリブタジエン骨格ウレタンメタクリレートオリゴマー、日本曹達社製
4HBA:4-ヒドロキシブチルアクリレート、大阪有機化学工業社製
ACMO:アクリロイルモルホリン、KJケミカルズ社製
ビスコート#150:テトラヒドロフルフリルアクリレート、大阪有機化学工業社製
MEDOL-10:(2-メチル-2-エチル-1,3-ジオキソラン-4-イル)メチルアクリレート、大阪有機化学工業社製
ニューフロンティアPGA:フェニルグリシジルエーテルアクリレート、第一工業製薬社製
SR506:イソボルニルアクリレート、アルケマ社製
アデカポリエーテルP-3000:ポリエーテルポリオール、ADEKA社製
クラレポリオールP-3010:ポリエステルポリオール、クラレ社製
Krasol LBH-P3000:ポリブタジエンポリオール、クレイバレー社製
Irganox1135:3-(4-ヒドロキシ-3,5-ジイソプロピルフェニル)プロピオン酸オクチル、BASF社製
Irgacure184:1-ヒドロキシシクロヘキシルフェニルケトン、BASF社製
下記表1に示す配合量(質量部)で各成分を均一に混合して実施例、及び比較例の光硬化性樹脂組成物を調製した。
図11に示すように、厚さ80μmのTAC層14と、厚さ30μmのPVA層15と、厚さ80μmのTAC層16と、厚さ25μmのアクリル系粘着剤層17とをこの順に備える偏光板18(株式会社ポラテクノ社製)を用意した。
JISZ0208の透湿度試験(透湿カップ法)に準拠して硬化樹脂層の透湿度を測定した。上述した光硬化性樹脂組成物に対して、積算光量が5000mJ/cm2となるように紫外線を照射して厚さ0.3mmの硬化樹脂層を準備した。この硬化樹脂層25を、図14に示すように、塩化カルシウム26を入れたカップ27にセットし、40℃、相対湿度90%の恒温機に入れ、24時間放置した後の塩化カルシウム26の重量増加を測定することで、硬化樹脂層25の透湿度を求めた。
Claims (12)
- 偏光板を含む画像表示部材と、硬化樹脂層と、光透過性部材とをこの順に備える画像表示装置における上記硬化樹脂層に用いられる光硬化性樹脂組成物であって、
硬化後の上記光硬化性樹脂組成物は、厚さ0.3mmのときの透湿度が、40℃、相対湿度90%の環境下で700g/m2/day以上である、光硬化性樹脂組成物。 - (メタ)アクリレート樹脂と、単官能モノマーと、光重合開始剤と、可塑剤とを含有する、請求項1記載の光硬化性樹脂組成物。
- 上記(メタ)アクリレート樹脂は、ポリエーテル系ウレタン(メタ)アクリレートオリゴマー及びポリエステル系ウレタン(メタ)アクリレートオリゴマーの少なくとも1種を含有する、請求項2記載の光硬化性樹脂組成物。
- 上記(メタ)アクリレート樹脂の含有量は、5~50質量%である、請求項2又は3記載の光硬化性樹脂組成物。
- 上記単官能モノマーは、水酸基含有(メタ)アクリレートモノマー及びヘテロ環含有(メタ)アクリレートモノマーの少なくとも1種を含有する、請求項2~4のいずれか1項記載の光硬化性樹脂組成物。
- 上記単官能モノマーの含有量は、10~40質量%である、請求項2~5のいずれか1項に3記載の光硬化性樹脂組成物。
- 上記可塑剤は、ポリエーテル系ポリオール及びポリエステル系ポリオールの少なくとも1種を含有する、請求項2~6のいずれか1項に記載の光硬化性樹脂組成物。
- 上記可塑剤の含有量は、15~50質量%である、請求項2~7のいずれか1項に記載の光硬化性樹脂組成物。
- 酸化防止剤をさらに含有する、請求項2~8のいずれか1項に記載の光硬化性樹脂組成物。
- 上記画像表示部材は、画像表示セルの視認側表面に偏光板が形成された画像表示パネルである、請求項1~9のいずれか1項に記載の光硬化性樹脂組成物。
- 偏光板を含む画像表示部材と、硬化樹脂層と、光透過性部材とをこの順に備え、
上記硬化樹脂層は、厚さ0.3mmのときの透湿度が、40℃、相対湿度90%の環境下で700g/m2/day以上である、画像表示装置。 - 請求項1~10のいずれか1項に記載の光硬化性樹脂組成物を、光透過性部材の表面又は、偏光板を含む画像表示部材の表面に塗布する工程と、
上記画像表示部材と上記光透過性部材とを上記光硬化性樹脂組成物を介して貼合せる工程と、
上記光硬化性樹脂組成物を硬化させる工程とを有する、画像表示装置の製造方法。
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