JP2011203709A - 偏光板用接着剤、偏光板、その製造方法、光学フィルム、及び画像表示装置 - Google Patents
偏光板用接着剤、偏光板、その製造方法、光学フィルム、及び画像表示装置 Download PDFInfo
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- JP2011203709A JP2011203709A JP2010222797A JP2010222797A JP2011203709A JP 2011203709 A JP2011203709 A JP 2011203709A JP 2010222797 A JP2010222797 A JP 2010222797A JP 2010222797 A JP2010222797 A JP 2010222797A JP 2011203709 A JP2011203709 A JP 2011203709A
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- adhesive
- polarizing plate
- resin
- protective film
- polyvinyl alcohol
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Abstract
【解決手段】本発明の偏光板用接着剤は、偏光子の少なくとも片面に透明保護フィルムを設けるために用いられ、ポリビニルアルコール系樹脂、及び水溶性珪酸塩を含有する樹脂溶液であることを特徴とする。
【選択図】なし
Description
前記偏光板用接着剤は、ポリビニルアルコール系樹脂、及び水溶性珪酸塩を含有する樹脂溶液であることを特徴とする偏光板用接着剤、に関する。
前記偏光板用接着剤を調製する工程、偏光子の前記接着剤層を形成する面及び/又は透明保護フィルムの前記接着剤層を形成する面に前記偏光板用接着剤を塗布する工程、及び偏光子と透明保護フィルムとを貼り合わせる工程を含むことを特徴とする偏光板の製造方法、に関する。
(偏光子)
平均重合度2400、ケン化度99.9モル%の厚み75μmのポリビニルアルコールフィルムを、30℃の温水中に60秒間浸漬し膨潤させた。次いで、ヨウ素/ヨウ化カリウム(重量比=0.5/8)の濃度0.3%の水溶液に浸漬し、3.5倍まで延伸させながらフィルムを染色した。その後、65℃のホウ酸エステル水溶液中で、トータルの延伸倍率が6倍となるように延伸を行った。延伸後に、40℃のオーブンにて3分間乾燥を行い、偏光子を得た。分光光度計(日本分光製、V7100)を用いて、単体透過率Tsを測定したところ、光透過率は42.50%であった。
厚さ80μmのトリアセチルセルロース(TAC)フィルムを用いた。
アセトアセチル(AA)基を含有するポリビニルアルコール(PVA)系樹脂(平均重合度:1200,ケン化度:98.5モル%,アセトアセチル化度:5モル%)100部に対し、珪酸ナトリウム(SiO2/Na2Oのモル比:4)10部を30℃の温度条件下で純水に溶解し、固形分濃度4%に調整して接着剤水溶液を得た。
上記透明保護フィルムの片面に、上記接着剤水溶液を乾燥後の接着剤層の厚みが80nmとなるように塗布した。次いで、23℃の温度条件下で偏光子の両面に接着剤付きの透明保護フィルムをロール機で貼り合せ、その後55℃で6分間乾燥して偏光板を作成した。
表1記載の配合で実施例1と同様の方法で接着剤水溶液を調製した。調製した接着剤水溶液を用いて、実施例1と同様にして偏光板を作成した。
(接着剤層の屈折率)
調製した接着剤水溶液を透明フィルムの上にアプリケーターで塗布し、70度で10分間乾燥して接着剤層を形成した。その後、接着剤層(5μm)を透明フィルムから剥離し、当該接着剤層の屈折率をプリズムカプラー(Sairon Technology,Inc.、SPA-4000)を用いて測定した。
分光光度計(日本分光製、V7100)を用いて、単体透過率Tsを測定した。
偏光板の端部において、偏光子と透明保護フィルムとの間にカッターの刃先を挿入した。当該挿入部において、偏光子と透明保護フィルムとを掴み、それぞれ反対方向に引っ張った。このとき、偏光子および/または透明保護フィルムが破断して剥離できなかった場合は、密着性が良好:「○」と判断し、偏光子と透明保護フィルムとの間で一部剥離した場合は、密着性にやや乏しい:「△」と判断し、偏光子と透明保護フィルムとの間で全部剥離した場合は、密着性に乏しい:「×」と判断した。
偏光板を、偏光子の吸収軸方向に50mm、吸収軸に直交する方向に25mmになるように切り出してサンプルを調製した。当該サンプルを60℃、95%RHの加温加湿雰囲気下に200時間放置した。このとき、偏光子/保護フィルム間に剥がれが生じなかった場合は○、端部が浮いた場合は△、すべて剥がれてしまった場合は×と判断した。
偏光板を1000mm×1000mmになるように切り出してサンプルを調製した。サンプルの偏光板を、蛍光灯下に置いた。サンプルの偏光板の光源側に別の偏光板を、それぞれの吸収軸が直行するように設置し、この状態で光抜けする箇所(点欠点、クニック欠陥)の個数をカウントした。
偏光子の吸収軸方向に50mm、吸収軸に直交する方向に25mmになるように切り出した偏光板を粘着剤を介してガラス板に接着してサンプルを調製し、当該サンプルの光透過率を分光光度計(日本分光製、V7100)を用いて測定した。その後、当該サンプルを60℃、95%RHの加温加湿雰囲気下に200時間放置し、同様に光透過率を測定した。加温加湿試験前後の光透過率の変化量(差)を表1に示す。また、当該サンプルを85℃、85%RHの加温加湿雰囲気下に200時間放置し、同様に光透過率を測定した。加温加湿試験前後の光透過率の変化量(差)を表1に示す。
Claims (13)
- 偏光子の少なくとも片面に透明保護フィルムを設けるために用いる偏光板用接着剤において、
前記偏光板用接着剤は、ポリビニルアルコール系樹脂、及び水溶性珪酸塩を含有する樹脂溶液であることを特徴とする偏光板用接着剤。 - 水溶性珪酸塩の配合量は、ポリビニルアルコール系樹脂100重量部に対して、1〜100重量部である請求項1記載の偏光板用接着剤。
- 水溶性珪酸塩が、珪酸リチウム、珪酸ナトリウム、及び珪酸カリウムからなる群より選択される少なくとも1種である請求項1又は2記載の偏光板用接着剤。
- 珪酸リチウムは、SiO2/Li2Oのモル比が2〜8である請求項3記載の偏光板用接着剤。
- 珪酸ナトリウムは、SiO2/Na2Oのモル比が2〜5である請求項3記載の偏光板用接着剤。
- 珪酸カリウムは、SiO2/K2Oのモル比が2〜5である請求項3記載の偏光板用接着剤。
- ポリビニルアルコール系樹脂が、アセトアセチル基を含有するポリビニルアルコール系樹脂である請求項1〜6のいずれかに記載の偏光板用接着剤。
- 偏光子の少なくとも一方の面に、接着剤層を介して透明保護フィルムが設けられている偏光板において、前記接着剤層が請求項1〜7のいずれかに記載の偏光板用接着剤により形成されていることを特徴とする偏光板。
- 接着剤層の厚みが、10〜300nmである請求項8記載の偏光板。
- 接着剤層の屈折率が、1.47〜1.54である請求項8又は9記載の偏光板。
- 偏光子の少なくとも一方の面に、接着剤層を介して透明保護フィルムが設けられている偏光板を製造する方法において、
請求項1〜7のいずれかに記載の偏光板用接着剤を調製する工程、偏光子の前記接着剤層を形成する面及び/又は透明保護フィルムの前記接着剤層を形成する面に前記偏光板用接着剤を塗布する工程、及び偏光子と透明保護フィルムとを貼り合わせる工程を含むことを特徴とする偏光板の製造方法。 - 請求項8〜10のいずれかに記載の偏光板が、少なくとも1枚積層されている光学フィルム。
- 請求項8〜10のいずれかに記載の偏光板、又は請求項12記載の光学フィルムを含む画像表示装置。
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