JP7308960B2 - 透明導電性フィルム、および透明導電性フィルムの製造方法 - Google Patents
透明導電性フィルム、および透明導電性フィルムの製造方法 Download PDFInfo
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- JP7308960B2 JP7308960B2 JP2021545721A JP2021545721A JP7308960B2 JP 7308960 B2 JP7308960 B2 JP 7308960B2 JP 2021545721 A JP2021545721 A JP 2021545721A JP 2021545721 A JP2021545721 A JP 2021545721A JP 7308960 B2 JP7308960 B2 JP 7308960B2
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Description
まず、長尺の第1透明樹脂基材S1(品名「KBフィルム CANIA」,厚さ54μm,両面ハードコート層付き二軸延伸PETフィルム,きもと社製)のロールを用意した。この基材は、透明な樹脂フィルムとしての長尺のポリエチレンテレフタレート(PET)フィルムと、当該フィルムの一方面上の第1ハードコート層と、他方面上の第2ハードコート層とを備える。
透明導電層の形成において、第1透明樹脂基材S1上に透明導電層の第1領域(厚さ52nm)を形成する第1スパッタ成膜と、当該第1領域上に透明導電層の第2領域(厚さ78nm)を形成する第2スパッタ成膜とを順次に実施したこと以外は、実施例1の透明導電性フィルムと同様にして、実施例3の透明導電性フィルムを作製した。
スパッタ成膜工程の前に第1透明樹脂基材S1をアニール処理したこと以外は、実施例2の透明導電性フィルムと同様にして、実施例3の透明導電性フィルムを作製した。アニール処理には、熱風オーブンを使用した。具体的には、第1透明樹脂基材S1を、ロールトゥロール方式で熱風オーブン内を通過するように走行させた(後記のアニール処理についても同様である)。アニール処理において、温度は160℃とし、処理時間は6分間とした。
次のこと以外は、実施例2の透明導電性フィルムと同様にして、実施例4の透明導電性フィルムを作製した。第1スパッタ成膜を、実施例2における第2スパッタ成膜の条件で実施し、当該第1スパッタ成膜により、厚さ78nmのAr含有ITO膜を形成した。第1スパッタ成膜後の第2スパッタ成膜を、実施例2における第1スパッタ成膜の条件で実施し、当該第2スパッタ成膜により、厚さ52nmのKr含有ITO膜を形成した。
第1透明樹脂基材S1の代わりに長尺の第2透明樹脂基材S2(品名「ダイヤホイル T910E125」,厚さ125μm,二軸延伸フィルム,三菱ケミカル社製)のロールを用いたこと以外は、実施例1の透明導電性フィルムと同様にして、実施例5の透明導電性フィルムを作製した。第2透明樹脂基材S2は、透明な樹脂フィルムとしての長尺のPETフィルムと、当該フィルムの一方面上の密着性向上層とを備える。
スパッタ成膜における次のこと以外は、実施例1の透明導電性フィルムと同様にして、実施例6の透明導電性フィルムを作製した。スパッタリングガスとしてクリプトンとアルゴンとの混合ガス(Kr85体積%,Ar15体積%)を用いた。成膜室内の気圧を0.2Paとした。成膜室への酸素導入量を、ITO膜の比抵抗の値が5.5×10-4Ω・cmになるように調整した。形成されるITO膜の厚さを150nmとした。
第1透明樹脂基材S1の代わりに長尺の第3透明樹脂基材S3(品名「GF-125JBN」,厚さ127μm,二軸延伸フィルム,三菱ケミカル社製)のロールを用いたこと以外は、実施例4の透明導電性フィルムと同様にして、比較例1の透明導電性フィルムを作製した。第3透明樹脂基材S3は、透明な樹脂フィルムとしての長尺のPETフィルムと、屈折率調整層と、ハードコート層とを、厚さ方向に順に備える。
次のこと以外は、実施例1の透明導電性フィルムと同様にして、比較例2の透明導電性フィルムを作製した。第1透明樹脂基材S1の代わりに第3透明樹脂基材S3を用いた。スパッタ成膜工程の前に、第3透明樹脂基材S3をアニール処理した。アニール処理において、温度は180℃とし、処理時間は6分間とした。
次のこと以外は、実施例1の透明導電性フィルムと同様にして、比較例3の透明導電性フィルムを作製した。第1透明樹脂基材S1の代わりに第3透明樹脂基材S3を用いた。スパッタ成膜において、スパッタリングガスとしてArを用い、成膜室内の気圧を0.4Paとし、成膜室への酸素導入量を、ITO膜の比抵抗の値が6.2×10-4Ω・cmになるように調整しつつ、厚さ150nmのITO膜を形成した。
第3透明樹脂基材S3の代わりに第1透明樹脂基材S1(品名「KBフィルム CANIA」,キモト社製)のロールを用いたこと以外は、比較例3の透明導電性フィルムと同様にして、比較例4の透明導電性フィルムを作製した。
実施例1~6および比較例1,2における各透明導電層がKr原子を含有することは、次のようにして確認した。まず、走査型蛍光X線分析装置(商品名「ZSX PrimusIV」,リガク社製)を使用して、下記の測定条件にて蛍光X線分析測定を5回繰り返し、各走査角度の平均値を算出し、X線スペクトルを作成した。そして、作成されたX線スペクトルにおいて、走査角度28.2°近傍にピークが出ていることを確認することにより、透明導電層にKr原子が含有されることを確認した。
スペクトル;Kr-KA
測定径:30mm
雰囲気:真空
ターゲット:Rh
管電圧:50kV
管電流:60mA
1次フィルタ:Ni40
走査角度(deg):27.0~29.5
ステップ(deg):0.020
速度(deg/分):0.75
アッテネータ:1/1
スリット:S2
分光結晶:LiF(200)
検出器:SC
PHA:100~300
透明樹脂基材、ハードコート層、密着性向上層、および屈折率調整層の厚さは、膜厚計(品名「デジタルダイアルゲージDG-205」,Peacock社製)によって測定した。
実施例1~6および比較例3,4における各透明導電層について、加熱処理後の比抵抗を調べた。加熱処理では、加熱手段として熱風オーブンを使用し、加熱温度を165℃とし、加熱時間を60分間とした。JIS K 7194(1994年)に準拠した四端子法により、透明導電層の表面抵抗を測定した後、表面抵抗値と透明導電層の厚さとを乗じることにより、比抵抗(Ω・cm)を求めた。加熱処理後の比抵抗の値を表1に掲げる。また、実施例1~6および比較例1~4における各透明導電層の低抵抗性について、上記加熱処理後の比抵抗が2.2×10-4でΩ・cm未満ある場合を“良”と評価し、上記加熱処理後の比抵抗が2.2×10-4でΩ・cm以上である場合を“不良”と評価した。この評価結果も表1に示す。
実施例1~6および比較例1~4の各透明導電性フィルムについて、加熱処理を経た場合の熱収縮率を調べた。具体的には、まず、透明導電性フィルムごとに、第1辺10cm×第2辺10cmのサイズの第1サンプルフィルムを3枚用意した。第1辺は、透明導電性フィルムにとってのMD方向(即ち、ロールトゥロール方式での上述の製造プロセスにおけるフィルム走行方向)に延びる辺である(後記の第1サンプルフィルムにおいても同様である)。第2辺は、透明導電性フィルムにとってのTD方向(即ち、前記フィルム走行方向と直交する方向)に延びる辺である(後記の第1サンプルフィルムにおいても同様である)。次に、各第1サンプルフィルムの形状を、非接触CNC画像測定機(商品名「QV ACCEL606-PRO」,ミツトヨ社製)によって測定した(第1測定)。次に、熱風オーブン内で第1サンプルフィルムを加熱処理した。加熱処理では、加熱温度を165℃とし、加熱時間を60分間とした。次に、加熱処理後に常温まで降温した各第1サンプルフィルムの形状を、上記非接触CNC画像測定機によって測定した(第2測定)。そして、第1測定によって得られた形状データと、第2測定によって得られた形状データとに基づき、いずれの第1サンプルフィルムにおいても、上記の加熱処理による熱収縮率が最大である方向(第1方向)がMD方向であることを特定した。また、透明導電性フィルムごとの3枚の第1サンプルフィルムにおける合計六つの第2辺の、加熱処理による熱収縮率の平均を、第2方向の第1熱収縮率T1(%)として求めた。その値を表1に示す。収縮前の長さをL1とし、収縮後の長さをL2とすると、熱収縮率(%)は、[(L1-L2)/L1]×100で表される。
実施例1~6および比較例1~4の各透明導電性フィルムについて、加熱処理を経た場合に透明導電層にクラックが発生する程度を調べた。具体的には、まず、長辺50cm×短辺5cmのサイズの透明導電性フィルムを3枚用意し、各フィルムの両短辺を、耐熱テープによって鉄板表面に固定した。次に、熱風オーブン内で鉄板上の各透明導電性フィルムを加熱処理した。加熱処理では、加熱温度を165℃とし、加熱時間を60分間とした。次に、加熱処理後に常温まで降温した透明導電性フィルムを5cm×5cmのサイズに細分化し、30枚の観察用のサンプルを得た。次に、サンプルごとに、光学顕微鏡によって観察してクラックの有無を調べた。そして、透明導電性フィルムの透明導電層におけるクラックの発生の抑制について、透明導電層にクラックが確認されたサンプルの数が、15枚以下である場合を“良”と評価し、16枚以上である場合を“不良”と評価した。この評価結果を表1に示す。
H 厚さ方向
10 透明樹脂基材
11 樹脂フィルム
12 機能層
20,20’ 透明導電層
Claims (4)
- 透明樹脂基材と透明導電層とを厚さ方向にこの順で備える透明導電性フィルムであって、
前記厚さ方向と直交する面方向において、前記透明樹脂基材の、165℃で60分間の加熱処理後の熱収縮率が最大である方向と直交する方向の前記加熱処理後の熱収縮率が、0.00%以上1.2%以下であり、
前記厚さ方向と直交する面方向において、前記透明導電性フィルムの、165℃で60分間の加熱処理後の熱収縮率が最大である方向と直交する方向の前記加熱処理後の熱収縮率が、0.03%以上1.2%以下であり、
前記透明導電層が、アルゴンより原子番号が大きな希ガス原子を含有する、透明導電性フィルム。 - 前記希ガス原子がクリプトンである、請求項1に記載の透明導電性フィルム。
- 前記透明導電層が非晶質である、請求項1または2に記載の透明導電性フィルム。
- 請求項1から3のいずれか一つに記載の透明導電性フィルムを用意する工程と、
前記透明導電層を加熱して結晶化させる工程とを含む、結晶質透明導電層を備える透明導電性フィルムの製造方法。
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CN108486550B (zh) * | 2018-04-27 | 2020-06-16 | 华南理工大学 | 一种金属氧化物透明导电薄膜的制备方法及其产品和用途 |
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