JP2009026558A - 導電性ペースト組成物、および該組成物を用いた透光性導電フィルム並びにその製造方法 - Google Patents
導電性ペースト組成物、および該組成物を用いた透光性導電フィルム並びにその製造方法 Download PDFInfo
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- JP2009026558A JP2009026558A JP2007187477A JP2007187477A JP2009026558A JP 2009026558 A JP2009026558 A JP 2009026558A JP 2007187477 A JP2007187477 A JP 2007187477A JP 2007187477 A JP2007187477 A JP 2007187477A JP 2009026558 A JP2009026558 A JP 2009026558A
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Abstract
【解決手段】(A)有機バインダー樹脂、(B)導電粉末、(C)黒色着色剤、(D)有機溶剤、および(E)架橋剤を含有してなり、前記有機バインダー樹脂(A)の数平均分子量が3000〜50000の範囲であることを特徴とする導電性ペースト組成物。
【選択図】 なし
Description
本発明を構成する有機バインダー樹脂(A)は、導電性ペーストを乾燥、硬化後も塗膜に残存し、密着性、耐屈曲性、硬度などの諸物性を付与したり、さらには印刷性を付与したりするために必要な重要な成分である。有機バインダー樹脂(A)の種類は、ペーストに印刷適性を付与できるものであれば限定されるものではなく、ポリエステル樹脂、ウレタン変性ポリエステル樹脂、エポキシ変性ポリエステル樹脂、アクリル変性ポリエステルなどの各種変性ポリエステル樹脂、ポリエーテルウレタン樹脂、ポリカーボネートウレタン樹脂、アクリルウレタン樹脂、塩化ビニル・酢酸ビニル共重合体、エポキシ樹脂、フェノール樹脂、アクリル樹脂、ポリビニルブチラール樹脂、ポリアミドイミド、ポリイミド、ポリアミド、ニトロセルロース、セルロース・アセテート・ブチレート(CAB)、セルロース・アセテート・プロピオネート(CAP)などの変性セルロース類などが挙げられる。
ガラス基板上に0.5cm×10cmのパターンを形成し、130℃にて30分間加熱処理を行なった後に、ミリオームハイテスターにて抵抗値を測定し、シート抵抗と膜厚に基づいて比抵抗値を算出した。
ガラス基板上に10μmのアプリケーターで塗布し、130℃にて30分間加熱処理を行った後に、アセトンを染み込ませたウェスで擦り耐溶剤性を評価した。評価基準は以下の通りである。
△: わずかに塗膜が溶解したもの
×: 塗膜が溶解し、下地まで達したもの
(3)保存安定性の評価
前記のようにして調製した導電性ペースト組成物について、40℃で7日間放置した後の状態を観察して保存安定性を評価した。評価基準は以下の通りである。
△: ペースト状態を保っているが、粘度上昇が見られたもの
×: ゲル化してペースト状態を保っていないもの
(4)印刷性の評価
線幅20μmで版深10μm、ピッチ300μmの格子パターンが形成されたクロームめっき凹版を用いてポリエステルフィルム(東レ製、ルミラー、125μm厚)にグラビア印刷にて格子状パターンを印刷し、130℃にて30分間加熱し乾燥を行なった。得られた透光性導電フィルムを観察し、地汚れ(非画線部へのペーストの付着)の有無、線幅再現性を目視観察し印刷性の評価を行った。評価基準は以下の通りである。
△:わずかに地汚れ、ヒゲ欠陥、かすれが確認されたもの
×:地汚れ、ヒゲ欠陥、かすれが全面にわたり確認されたもの
(5)視認性の評価
線幅20μmで版深10μm、ピッチ300μmの格子パターンが形成されたクロームめっき凹版を用いてポリエステルフィルム(東レ製、ルミラー、125μm厚)にグラビア印刷にて格子状パターンを印刷し、130℃にて30分間加熱し、得られた透光性導電フィルムをPDP画面の最前面に貼り付けて目視観察にて評価を行った。評価基準は以下の通りである。
△:電磁波シールドパターン部にかすかにムラやメッシュ等が確認されたもの
×:電磁波シールドパターン部の全面にわたりムラやメッシュ等が確認されたもの
これらの結果を表2に示す。なお、比較例1は耐溶剤性に劣るため粘着剤の塗布が不可能であったので、視認性の評価は実施不能であった。
Claims (5)
- (A)有機バインダー樹脂、(B)導電粉末、(C)着色剤、(D)有機溶剤、および(E)架橋剤を含有してなり、前記有機バインダー樹脂(A)の数平均分子量が3000〜50000の範囲であることを特徴とする導電性ペースト組成物。
- 前記架橋剤(E)が、一分子中に2個以上のイソシアネート基を有するイソシアネート化合物であることを特徴とする請求項1に記載の導電性ペースト組成物。
- 請求項1又は2に記載の導電性ペースト組成物に含有される有機バインダー樹脂(A)、導電粉末(B)、着色剤(C)、および架橋剤(E)の配合比が、質量基準において、[(B)+(C)]/[(A)+(E)]=7/1〜17/1を満たすことを特徴とする導電性ペースト組成物。
- 透明樹脂フィルム上に請求項1乃至3のいずれか1項に記載の導電性ペースト組成物を用いて形成された網目状の導電性パターンを具備する透光性導電フィルム。
- 透明樹脂フィルム上に網目状の導電性パターンが形成された透光性導電フィルムの製造方法において、請求項1乃至3のいずれか1項に記載の導電性ペースト組成物をグラビア印刷又はグラビアオフセット印刷を用いて透明樹脂フィルム上に網目状のパターンを形成することを特徴とする、透光性導電フィルムの製造方法。
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