JP7199773B2 - 高分子フォーム粘着テープおよびこれを含む感圧型タッチパネル - Google Patents
高分子フォーム粘着テープおよびこれを含む感圧型タッチパネル Download PDFInfo
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- JP7199773B2 JP7199773B2 JP2019522495A JP2019522495A JP7199773B2 JP 7199773 B2 JP7199773 B2 JP 7199773B2 JP 2019522495 A JP2019522495 A JP 2019522495A JP 2019522495 A JP2019522495 A JP 2019522495A JP 7199773 B2 JP7199773 B2 JP 7199773B2
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- adhesive tape
- polymer foam
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- pressure
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Landscapes
- Engineering & Computer Science (AREA)
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Adhesive Tapes (AREA)
- Adhesives Or Adhesive Processes (AREA)
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Description
[式1]
圧縮率(%)={(圧力を加える前の厚さ-圧力を加えた後の厚さ)/圧力を加える前の厚さ}×100
[式2]
厚さ回復率(%)={(圧力を加える前の厚さ-圧力が除去された後の厚さ)/(圧力を加える前の厚さ-圧力を加えた後の厚さ)}×100
25μmの厚さを有する透明PET(Polyethylene terephthalate)フィルムの一面上に厚さ125μm、密度0.24g/cm3を有するウレタン系フォーム層を積層した。さらに、前記ウレタン系フォーム層上にアクリル系粘着剤からなる第1粘着層を10μm厚さに形成し、前記基材フィルムの他面上にアクリル系粘着剤からなる第2粘着層を10μm厚さに形成して高分子フォーム粘着テープを準備した。
80重量%のエチルヘキシルアクリレート、10重量%のアクリル酸、10重量%のヒドロキシルエチルアクリレートを含むアクリル組成物を準備し、アクリル組成物100重量部に0.1重量部の光開始剤(Irgacure 651、BASF)、1.5重量部の硬化剤(SUO-1020、Shin-a T&C)、2重量部の界面活性剤を混合した後、Rotor-Statorタイプのミキサーを用いて気体を混合した。さらに、準備したアクリル組成物に総5.5W/cm2のUVを照射して硬化させることにより、厚さ125μm、密度0.28g/cm3のアクリル系フォーム層を製造した。
25μmの厚さを有する透明PET(Polyethylene terephthalate)フィルムの一面上に厚さ125μm、密度0.5g/cm3を有するウレタン系フォーム層を積層した。さらに、前記ウレタン系フォーム層上にアクリル系粘着剤からなる第1粘着層を10μm厚さに形成し、前記基材フィルムの他面上にアクリル系粘着剤からなる第2粘着層を10μm厚さに形成して高分子フォーム粘着テープを準備した。
25μmの厚さを有する透明PET(Polyethylene terephthalate)フィルムの一面上に厚さ125μm、密度0.9g/cm3を有するウレタン系フォーム層を積層した。さらに、前記ウレタン系フォーム層上にアクリル系粘着剤からなる第1粘着層を10μm厚さに形成し、前記基材フィルムの他面上にアクリル系粘着剤からなる第2粘着層を10μm厚さに形成して高分子フォーム粘着テープを準備した。
80重量%のエチルヘキシルアクリレート、10重量%のアクリル酸、10重量%のヒドロキシルエチルアクリレートを含むアクリル組成物を準備し、前記アクリル組成物に発泡層を形成するために、アクリル組成物100重量部に対して0.4重量部の高分子微小中空球(密度0.025g/cm3、平均粒径40μm)、0.1重量部の光開始剤(Irgacure 651、BASF)および1.25重量部のウレタンアクリレート系硬化剤(SUO- 1020、Shin-a T&C)を混合して組成物を準備した。さらに、準備したアクリル組成物に総5.5W/cm2のUVを照射して硬化させることにより、厚さ125μm、密度0.9g/cm3のアクリル系フォームフィルムを製造した
50μmの厚さを有する透明PET(Polyethylene terephthalate)フィルムの一面上に厚さ100μm、密度0.24g/cm3を有するウレタン系フォーム層を積層した。さらに、前記ウレタン系フォーム層上にアクリル系粘着剤からなる第1粘着層を10μm厚さに形成し、前記基材フィルムの他面上にアクリル系粘着剤からなる第2粘着層を10μm厚さに形成して高分子フォーム粘着テープを準備した。
12μmの厚さを有する透明PET(Polyethylene terephthalate)フィルムの一面上に厚さ150μm、密度0.24g/cm3を有するウレタン系フォーム層を積層した。さらに、前記ウレタン系フォーム層上にアクリル系粘着剤からなる第1粘着層を10μm厚さに形成し、前記基材フィルムの他面上にアクリル系粘着剤からなる第2粘着層を10μm厚さに形成して高分子フォーム粘着テープを準備した。
実施例1~2および比較例1~3で準備された高分子フォーム粘着テープの両面をガラス基材に付着し、混入された空気層を除去するために50℃および5barの条件で20分間圧着した後、常温で2時間放置した。その後、厚さゲージで圧着前厚さを測定した。
200 高分子フォーム層
300 第1粘着層
400 第2粘着層
Claims (6)
- 感圧型タッチパネル用である高分子フォーム粘着テープであって、
基材フィルム、前記基材フィルムの一面上に備えられた高分子フォーム層、前記高分子フォーム層上に備えられた第1粘着層、および前記基材フィルムの他面上に備えられた第2粘着層を含み、
前記高分子フォーム層の密度は0.3g/cm3以下であり、
前記高分子フォーム層は、平均直径が10μm以上100μm以下の気孔を含み、
前記高分子フォーム層の厚さは75μm以上1,000μm以下であり、
前記基材フィルムおよび前記高分子フォーム層の厚さ比は1:3~1:10であり、
前記基材フィルムの厚さは10μm以上250μm以下であり、
前記基材フィルムは、ポリエチレンテレフタレートであり、
前記高分子フォーム粘着テープの0.1秒以内の圧縮復元率は90%以上であり、
前記高分子フォーム粘着テープの最大圧縮率は30%以上70%以下であり、
前記高分子フォーム層は、ウレタン系フォーム層とアクリルフォーム層からなる群から選択されるものであり、
前記圧縮復元率は、前記高分子フォーム粘着テープに圧力が除去された場合、圧力が加えられる前の厚さに回復する程度であって、
前記圧力は、両面にガラス基材に付着された高分子フォーム粘着テープに対して、直径10mmのチップで10mm/minの速度で10gから1kgまで荷重を増加させながら圧縮後に、1kgの荷重が30秒間維持される、高分子フォーム粘着テープ。 - 前記高分子フォーム粘着テープの最小圧縮荷重は30g以上300g以下である、請求項1に記載の高分子フォーム粘着テープ。
- 前記高分子フォーム粘着テープの誘電率は105Hzの周波数で2.5以上4.5以下である、請求項1に記載の高分子フォーム粘着テープ。
- 前記基材フィルムと前記高分子フォーム層の総厚さは100μm以上1,000μm以下である、請求項1に記載の高分子フォーム粘着テープ。
- 前記高分子フォーム粘着テープの1秒以内の圧縮復元率は99%以上である、請求項1に記載の高分子フォーム粘着テープ。
- 請求項1に記載の高分子フォーム粘着テープを含む感圧型タッチパネル。
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