JP2015068882A - 光透過性積層体 - Google Patents
光透過性積層体 Download PDFInfo
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- JP2015068882A JP2015068882A JP2013200995A JP2013200995A JP2015068882A JP 2015068882 A JP2015068882 A JP 2015068882A JP 2013200995 A JP2013200995 A JP 2013200995A JP 2013200995 A JP2013200995 A JP 2013200995A JP 2015068882 A JP2015068882 A JP 2015068882A
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- Prior art keywords
- thin film
- layer
- adhesive layer
- light transmissive
- metal
- Prior art date
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Abstract
【解決手段】光透過性基板12の面上に、金属薄膜と光透過性基板よりも屈折率の高い高屈折率薄膜とが含まれる複数の薄膜が積層されてなる薄膜層14と、粘着剤層16と、ポリオレフィン層18と、ハードコート層20と、をこの順で有し、粘着剤層16の430〜1818cm−1に赤外吸収を持つ官能基の種類の少なくとも一部が、ハードコート層20の430〜1818cm−1に赤外吸収を持つ官能基の種類の少なくとも一部と同一である光透過性積層体10とする。
【選択図】図1
Description
実施例1に係る光透過性積層体として、光透過性高分子フィルムの一方面に、概略以下の3層薄膜からなる薄膜層と、この薄膜層に接して積層された粘着剤層と、この粘着剤層に接して積層されたポリオレフィン層と、このポリオレフィン層に接して積層されたハードコート層と、を有する光透過性積層体を作製した。
先ず、ゾル−ゲル法によるTiO2薄膜の形成に使用するコーティング液を調製した。すなわち、チタンアルコキシドとして、テトラ−n−ブトキシチタン4量体(日本曹達(株)製、「B4」)と、紫外線吸収性のキレートを形成する添加剤として、アセチルアセトンとを、n−ブタノールとイソプロピルアルコールとの混合溶媒に配合し、これを攪拌機を用いて10分間混合することにより、コーティング液を調製した。この際、テトラ−n−ブトキシチタン4量体/アセチルアセトン/n−ブタノール/イソプロピルアルコールの配合は、それぞれ6.75質量%/3.38質量%/59.87質量%/30.00質量%とした。
光透過性高分子フィルムとして、一方面に易接着層を有する厚み50μmのポリエチレンテレフタレートフィルム(東洋紡績(株)製、「コスモシャイン(登録商標)A4100」)(以下、「PETフィルム」という。)を用い、このPETフィルムの易接着層面側とは反対側の面(PET面)側に、1層目として、TiO2薄膜を以下の手順により成膜した。
Computing International社製)により測定した。
薄膜層の表面に、アクリル樹脂粘着剤(東洋インキ社製「主剤:BPS5260、硬化剤:BHS8515」)を塗布して、粘着剤層(厚み1.5μm)を形成した。主剤:硬化剤の配合比率は、質量比で100:3.0とした。
OPPフィルム(東洋紡社製「P2111」、厚み:20μm、片面:コロナ処理)のコロナ処理が施されていない面にコロナ処理を施した。次いで、紫外線硬化性のアクリル樹脂(DIC(株)製、「UVTクリアーTEF−046」)を濃度20%となるようにMEKで希釈し、塗工液を調製した。次いで、OPPフィルムの一方面に塗工液を塗工し、乾燥し、さらに紫外線を照射して、ハードコート層(厚み1.5μm)を形成した。
OPPフィルムの一方面にハードコート層を形成したフィルムのハードコート層を形成していない面が接するようにこのフィルムを粘着剤層の上に載せ、圧力をかけて密着させ、ポリオレフィン層(厚み20μm)を形成した。以上により、実施例1に係る光透過性積層体を作製した。
アクリル樹脂粘着剤に代えてアクリルウレタン接着剤(東洋モートン社製「主剤:TM−386、硬化剤:CAT−21B」)を用いて接着剤層を形成し、アクリル樹脂に代えてアクリルウレタン樹脂(DICグラフィックス社製「RC29−119)を用いてハードコート層を形成した以外は実施例1と同様にして、実施例2に係る光透過性積層体を作製した。
アクリル樹脂粘着剤に代えてアクリルウレタン接着剤(東洋モートン社製「主剤:TM−386、硬化剤:CAT−21B」)を用いて接着剤層を形成した以外は実施例1と同様にして、実施例3に係る光透過性積層体を作製した。
アクリル樹脂粘着剤に代えてエポキシ接着剤(アイカ工業社製「Z−590CW3」)を用いて接着剤層を形成し、アクリル樹脂(DICグラフィックス社製「UVTクリヤーTEF−046」)を用いてハードコート層を形成した以外は実施例1と同様にして、比較例1に係る光透過性積層体を作製した。
アクリル樹脂粘着剤に代えてウレタン接着剤(DIC社製「ユニディック V−9520」)を用いて接着剤層を形成し、アクリル樹脂に代えてウレタン樹脂(三井化学社製「オレスター」)を用いてハードコート層を形成した以外は実施例1と同様にして、参考例に係る光透過性積層体を作製した。
光透過性積層体の薄膜層側とは反対面に、厚さ25μmのアクリル粘着シート(積水化学工業社製「5402」)を貼り付け、この粘着シートの粘着層を、板ガラスの片面に貼り付けた。JIS R3106に準拠し、反射率を求めた。測定光は、光透過性積層体側から入射させた。
光透過性積層体の薄膜層側とは反対面に、厚さ25μmのアクリル粘着シート(積水化学工業社製「5402」)を貼り付け、この粘着シートの粘着層を、板ガラスの片面に貼り付けた。JIS R3106に準拠し、ガラス面およびフィルム面の垂直放射率を求め、JIS A5759に準拠して熱貫流率(W/m2K)を求めた。測定光は、光透過性積層体側から入射させた。
JIS K5600−5−6に準拠して測定した。ハードコート層の面に対して垂直になるように刃を当て、2mm間隔で6本の切り込みを入れた後、90度方向を変えて先の切り込みと直交する6本の切り込みを2mm間隔で入れて、25マスを作製した。その後、ハードコート層の格子にカットした部分にテープを貼り、テープ上をこすった。その後、テープを60度に近い角度で確実に引き剥がした上で、ハードコート層の剥離の有無を調べた。剥離が見られなかった場合を良好「○」、剥離が見られた場合を不良「×」とした。
JIS A5759の粘着力試験に準拠して、粘着剤層あるいは接着剤層からポリオレフィン層を剥離するときに必要な力を測定した。この際、剥離力が3.0N/25mm以上である場合を良好「○」、3.0N/25mm未満である場合を不良「×」とした。
スチールウール(日本スチール社製「Bon Star No.0000」)を用い、ハードコート層の表面に一定の荷重(20g/cm2)をかけながらスチールウールを10往復擦り付けた。この際、目視にて傷が全く観測されなかった場合を良好「◎」、傷は観測されるが面内で10本未満である場合を「○」、観測される面内の傷が10本以上である場合を不良「×」とした。
12 光透過性基板
14 薄膜層
16 粘着剤層
18 ポリオレフィン層
20 ハードコート層
Claims (4)
- 光透過性基板の面上に、金属薄膜と前記光透過性基板よりも屈折率の高い高屈折率薄膜とが含まれる複数の薄膜が積層されてなる薄膜層と、粘着剤層および/または接着剤層と、ポリオレフィン層と、ハードコート層と、をこの順で有し、
前記粘着剤層および/または接着剤層の430〜1818cm−1に赤外吸収を持つ官能基の種類の少なくとも一部が、前記ハードコート層の430〜1818cm−1に赤外吸収を持つ官能基の種類の少なくとも一部と同一であることを特徴とする光透過性積層体。 - 前記粘着剤層および/または接着剤層の430〜1818cm−1に赤外吸収を持つ官能基の種類の全部が、前記ハードコート層の430〜1818cm−1に赤外吸収を持つ官能基の種類の全部と同一であることを特徴とする請求項1に記載の光透過性積層体。
- 前記粘着剤層および/または接着剤層と前記ハードコート層の430〜1818cm−1に赤外吸収を持つ官能基の種類の少なくとも一部が、アクリル基であることを特徴とする請求項1に記載の光透過性積層体。
- 前記粘着剤層および/または接着剤層と前記ハードコート層の430〜1818cm−1に赤外吸収を持つ官能基の種類の全部が、アクリル基であることを特徴とする請求項2に記載の光透過性積層体。
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