JP2012208246A - 偏光板および積層光学部材 - Google Patents
偏光板および積層光学部材 Download PDFInfo
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- JP2012208246A JP2012208246A JP2011072886A JP2011072886A JP2012208246A JP 2012208246 A JP2012208246 A JP 2012208246A JP 2011072886 A JP2011072886 A JP 2011072886A JP 2011072886 A JP2011072886 A JP 2011072886A JP 2012208246 A JP2012208246 A JP 2012208246A
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- Prior art keywords
- polarizing plate
- polarizer
- adhesive
- resin
- protective film
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Abstract
【解決手段】ポリビニルアルコール系偏光子に、接着剤を介して保護膜が貼合された偏光板であって、その接着剤は、(A)光カチオン硬化性成分100重量部に対し、(B)光カチオン重合開始剤を1〜10重量部含有し、その硬化物が80℃で1000MPa以上の貯蔵弾性率を示す光硬化性接着剤組成物から形成されており、上記の光カチオン硬化性成分(A)は以下の(A1)と(A2)を含有するように調製される。(A1)脂環式環に結合するエポキシ基を有する脂環式エポキシ化合物を50〜95重量%、(A2)塩素含有量が1重量%以下であり、下式(I)(Zはアルキレン基など)で示されるジグリシジル化合物を5〜50重量%。
【選択図】なし
Description
(A2)塩素含有量が1重量%以下であって、下式(I)で示されるジグリシジル化合物を5〜50重量%:
本発明に用いる光硬化性接着剤組成物は、上述のとおり、(A)光カチオン硬化性成分100重量部に対し、(B)光カチオン重合開始剤を1〜10重量部含有するものであって、さらにその光カチオン硬化性成分(A)は、以下の(A1)および(A2)を含有する。
(A2)塩素含有量が1%以下であって、前記式(I)で示されるジグリシジルエーテル化合物を5〜50重量%。
光カチオン硬化性成分(A)の主成分となる脂環式エポキシ化合物(A1)は、周知一般のエポキシ化合物であることができるが、耐候性、屈折率および光硬化性の観点から、その分子構造中に芳香族環を含まないものが好ましい。脂環式エポキシ化合物(A1)としては、たとえば、以下の一般式(1)〜(23)で表されるものが挙げられる。
−CmH2m−Z1−CnH2n−
で示される2価の基であり、ここで−Z1−は、−SO2−、−SO−または−CO−であり、mおよびnは各々独立に1以上の整数であるが、両者の合計は9以下である。2価の脂環式炭化水素基の典型的な例としては、シクロペンチレンやシクロヘキシレンがある。
光硬化性接着剤組成物に配合される光カチオン重合開始剤(B)は、光照射によりカチオン重合を開始させる物質を放出することが可能な化合物であり、特に好ましいものは、光照射によってルイス酸を放出するオニウム塩である複塩、またはその誘導体である。かかる化合物の代表的なものとしては、一般式、[A]y+[B]y-で表される陽イオンと陰イオンの塩を挙げることができる。
・下記構造のスルホニウム陽イオンを有する化合物
(トリルクミル)ヨードニウム、ビス(ターシャリブチルフェニル)ヨードニウム、トリフェニルスルホニウムなど。
この光硬化性接着剤組成物には、塗工適性改善のため、有機溶剤が少量配合されてもよい。有機溶剤は、偏光子の光学性能を低下させることなく、光硬化性接着剤組成物を良好に溶解するものであればよく、その種類に特別な限定はない。たとえば、トルエンに代表される炭化水素類、酢酸エチルに代表されるエステル類などの有機溶剤が使用できる。
重合性モノマーとしてラジカル重合性モノマーを用いる場合は、光ラジカル重合開始剤も配合される。光ラジカル重合開始剤としては、アセトフェノン系化合物、ベンジル系化合物、べンゾフェノン系化合物、チオキサントン系化合物等のケトン系化合物を挙げることができる。
以上のような光硬化性接着剤組成物を用いて偏光子と保護膜とを貼合し、偏光板を製造する。偏光子と保護膜の間に光硬化性接着剤を塗布する方法に特別な限定はなく、たとえば、ドクターブレード、ワイヤーバー、ダイコーター、カンマコーター、グラビアコーターなど、種々の塗工方式が利用できる。また、偏光子と保護膜の間に上記光硬化性接着剤を滴下したのち、ロール等で加圧して均一に押し広げる方法も利用できる。ここで、ロールの材質は金属やゴムなどを用いることが可能であり、偏光子と保護膜の間に上記光硬化性接着剤を滴下したものをロールとロールの間に通して加圧して押し広げる場合は、これらロールは同じ材質であってもよく、異なる材質であってもよい。接着剤層の厚さは、通常50μm以下、好ましくは20μm以下、さらに好ましくは10μm以下である。
偏光板の使用に際しては、本発明の保護膜層を介して偏光機能以外の光学機能を示す光学層を設けた光学部材とすることもできる。光学部材の形成を目的に偏光板に積層する光学層には、たとえば、反射層、半透過型反射層、光拡散層、位相差板、集光板、輝度向上フィルムなど、液晶表示装置等の形成に用いられるものがある。前記の反射層、半透過型反射層および光拡散層は、反射型ないし半透過型や拡散型、それらの両用型の偏光板からなる光学部材を形成する場合に用いられるものである。
次の各成分が酢酸エチルに固形分濃度60%で溶解されており、硬化後に1.53の屈折率を与える紫外線硬化性樹脂組成物を用意した。
多官能ウレタン化アクリレート * 40部
* 多官能ウレタン化アクリレート:ヘキサメチレンジイソシアネートとペンタエリスリトールトリアクリレートの反応生成物。
(A1)脂環式エポキシ化合物
a1 :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
a21 :1,4−ブタンジオールジグリシジルエーテル(塩素含有量0.5%)
a21c:1,4−ブタンジオールジグリシジルエーテル(塩素含有量8.0%)
a22 :ネオペンチルグリコールジグリシジルエーテル(塩素含有量0.5%)
a22c:ネオペンチルグリコールジグリシジルエーテル(塩素含有量8.1%)
a23 :シクロヘキサンジメタノールジグリシジルエーテル(塩素含有量0.4%)
a23c:シクロヘキサンジメタノールジグリシジルエーテル(塩素含有量7.7%)
(b1)トリアリールスルホニウム ヘキサフルオロホスフェート
(1)光硬化性接着剤組成物の調製
光カチオン硬化性成分および光カチオン重合開始剤を、それぞれ表1に示す配合割合で混合した後、脱泡して、光硬化性接着剤液を調製した。なお、光カチオン重合開始剤(b1)は、50%プロピレンカーボネート溶液として配合し、表1にはその固形分量で表示した。
上で調製したそれぞれの接着剤液に含まれる塩素濃度を、以下のようにして測定した。すなわち、まず各接着剤液を燃焼装置“TOX−100”〔(株)ダイアインスツルメンツ製〕で分解し、ガスを吸収液に捕集した後、イオンクロマトグラフ装置“ICS−2000”(ダイオネクス社製)で塩素量を求め、それと最初の分解に用いた接着剤液の量から、塩素濃度を算出した。それぞれの塩素濃度測定結果を表1に示した。
表面に易接着層を有しないポリエチレンテレフタレートフィルム〔商品名“東洋紡エステルフィルムE7002”、東洋紡績(株)製〕の片面に、塗工機〔バーコーター、第一理化(株)製〕を用いて、上記(1)で調製したそれぞれの接着剤液を硬化後の膜厚が約25μmとなるように塗工した。次に、フュージョンUVシステムズ社製の“Dバルブ”により、積算光量が3000mJ/cm2となるように紫外線を照射して、接着剤を硬化させた。これを5mm×30mmの大きさに裁断し、ポリエチレンテレフタレートフィルムを剥がして接着剤の硬化フィルムを得た。そして、アイティー計測機器(株)製の動的粘弾性測定装置“DVA−220”を使用し、上で得た硬化フィルムをその長辺が引張り方向となるようにつかみ具の間隔2cmで把持し、引張りと収縮の周波数1Hz、昇温速度3℃/分に設定して、温度80℃における貯蔵弾性率を求めた。結果を表1に示した。
紫外線吸収剤を含む厚さ80μmのトリアセチルセルロースフィルム〔商品名“フジタック”、富士フイルム(株)製〕の表面にコロナ放電処理を施し、そのコロナ放電処理面に、バーコーターを用いて、上記(1)で調製したそれぞれの接着剤液を硬化後の膜厚が約3μmとなるように塗工した。その接着剤層にポリビニルアルコール−ヨウ素系偏光子を貼合した。一方、参考例で作製した防眩層を有する厚さ43μmの二軸延伸ポリエチレンテレフタレートフィルムの防眩層とは反対側の表面(易接着層面)にコロナ放電処理を施し、そのコロナ放電処理面に、上と同じ接着剤液を硬化後の膜厚が約3μmとなるようにバーコーターで塗工した。その接着剤層に、上で作製したトリアセチルセルロースフィルムが片面に貼合された偏光子の偏光子側を貼合し、積層物を作製した。この積層物の防眩層を有する二軸延伸ポリエチレンテレフタレートフィルム側から、ベルトコンベア付き紫外線照射装置を用いて、フュージョンUVシステムズ社製の“Dバルブ”により、積算光量が750mJ/cm2となるように紫外線を照射して、接着剤を硬化させた。こうして、偏光子の両面に保護膜が貼合された偏光板を作製した。
上記(4)で作製した偏光板を170mm×110mmの大きさに裁断し、トリアセチルセルロースフィルム側に厚さ25μmのアクリル系粘着剤層を設け、その粘着剤層をガラス板に貼って、冷熱衝撃試験(ヒートショック試験)を行なった。冷熱衝撃試験は、上記のガラス板に貼合された偏光板サンプルを、−35℃で1時間保持し、次に70℃に昇温して1時間保持する操作を1サイクルとし、これを合計30サイクル繰り返すことにより行なった。この試験をそれぞれの偏光板6サンプルについて行ない、試験後の偏光子に割れが観察されたものの全サンプル数(6)に対する割合で評価した。結果を表1に示した。
Claims (6)
- 二色性色素が吸着配向されたポリビニルアルコール系樹脂フィルムからなる偏光子の少なくとも一方の面に、接着剤を介して透明樹脂からなる保護膜が貼合されてなる偏光板であって、前記接着剤は、
(A)(A1)分子内に2個以上のエポキシ基を有し、そのうちの少なくとも1個は脂環式環に結合している脂環式エポキシ化合物を50〜95重量%、および
(A2)塩素含有量が1重量%以下であって、下式(I):
で示されるジグリシジル化合物を5〜50重量%
含有する光カチオン硬化性成分100重量部に対し、
(B)光カチオン重合開始剤を1〜10重量部
含有し、その硬化物が、80℃において1000MPa以上の貯蔵弾性率を示す光硬化性接着剤組成物から形成されている、偏光板。 - 偏光子の少なくとも一方の面に貼合される保護膜は、アセチルセルロース系樹脂からなる請求項1に記載の偏光板。
- 偏光子の少なくとも一方の面に貼合される保護膜は、非晶性ポリオレフィン系樹脂、ポリエステル系樹脂、ポリカーボネート系樹脂および鎖状ポリオレフィン系樹脂からなる群より選ばれる請求項1に記載の偏光板。
- 偏光子の一方の面に、アセチルセルロース系樹脂からなる保護膜が前記接着剤を介して貼合され、偏光子の他方の面に、非晶性ポリオレフィン系樹脂、ポリエステル系樹脂、ポリカーボネート系樹脂および鎖状ポリオレフィン系樹脂からなる群より選ばれる透明樹脂からなる保護膜が前記接着剤を介して貼合されている請求項1に記載の偏光板。
- 請求項1〜4のいずれかに記載の偏光板と他の光学層との積層体からなる、積層光学部材。
- 前記光学層は位相差フィルムを含む請求項5に記載の積層光学部材。
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