JP7215422B2 - 両面粘着テープ又はシート、及び、その製造方法 - Google Patents
両面粘着テープ又はシート、及び、その製造方法 Download PDFInfo
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- JP7215422B2 JP7215422B2 JP2019531012A JP2019531012A JP7215422B2 JP 7215422 B2 JP7215422 B2 JP 7215422B2 JP 2019531012 A JP2019531012 A JP 2019531012A JP 2019531012 A JP2019531012 A JP 2019531012A JP 7215422 B2 JP7215422 B2 JP 7215422B2
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- Prior art keywords
- sensitive adhesive
- pressure
- support
- double
- sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- C—CHEMISTRY; METALLURGY
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Description
本発明は、上記に鑑みてなされたものであり、薄い厚みであっても強度や絶縁性に優れ、かつ軽量の両面粘着テープ又はシートを提供することを目的とする。
すなわち、本発明は、例えば、以下の項に記載の発明を包含する。
項1. 支持体及び該支持体の両面に形成された2つの粘着剤層からなる積層体を含む両面粘着テープ又はシートであって、
前記支持体はポリプロピレン系樹脂を含み、
前記粘着剤層はアクリル系重合体を含み、
前記積層体の総厚み(Ds)が4~15μmであり、
前記支持体の厚み(Dp)と、前記積層体の総厚み(Ds)との比Dp/Dsの値が、0.15~0.6であり、
前記積層体の密度が0.90~1.10g/cm3である、両面粘着テープ又はシート。
項2. 前記比Dp/Dsの値が0.18~0.35であり、
前記積層体の密度が0.90~1.07g/cm3である、
項1に記載の両面粘着テープ又はシート。
項3. 前記支持体の厚み(Dp)が1.5~6μmである、項1又は2に記載の両面粘着テープ又はシート。
項4. 前記支持体が密度0.90~0.94g/cm3の二軸延伸ポリプロピレン系フィルムである、項1~3のいずれか1項に記載の両面粘着テープ又はシート。
項5. 前記支持体は、該支持体の全質量に対して、メソペンタッド分率が90~99.5%であるアイソタクチックホモポリプロピレンを80~100質量%含有する、項1~4のいずれか1項に記載の両面粘着テープ又はシート。
項6. 前記粘着剤層が、(メタ)アクリル酸エステル単位(a1)を含むアクリル共重合体を主成分とする、項1~5のいずれか1項に記載の両面粘着テープ又はシート。
項7. 前記粘着剤層は、アクリル系粘着組成物が固形化された層であり、
前記アクリル系粘着組成物は、非架橋性(メタ)アクリル酸エステル単位(a1)と、架橋性官能基を有するアクリル単量体単位(a2)を含有する架橋性アクリル共重合体(A)を主成分とする、項1~6のいずれか1項に記載の両面粘着テープ又はシート。
項8. 前記非架橋性(メタ)アクリル酸エステル単位(a1)がアクリル酸n-ブチル単量体単位及びアクリル酸メチル単量体単位の二種であり、前記架橋性官能基を有するアクリル単量体単位(a2)がアクリル酸単量体単位であり、
アクリル系粘着組成物において、前記アクリル酸n-ブチル単量体単位が45~84質量%であり、前記アクリル酸メチル単量体単位が15~54質量%であり、前記アクリル酸単量体単位が1~10質量%である、項7に記載の両面粘着テープ又はシート。
。
項9. 前記粘着剤層は、アクリル系粘着組成物が固形化された層であり、
前記アクリル系粘着組成物が、架橋剤(B)を含有する、項1~8のいずれか1項に記載の両面粘着テープ又はシート。
項10. 前記架橋剤(B)が、N,N,N’,N’-テトラグリシジル-m-キシレンジアミン及び1,3-ビス(N,N-ジグリシジルアミノメチル)シクロヘキサンからなる群から選ばれた少なくとも一種である、項9に記載の両面粘着テープ又はシート。
項11. 項1~10のいずれか1項に記載の両面粘着テープ又はシートと、セパレーターとを備え、
前記セパレーターは、前記両面粘着テープ又はシートの少なくとも片側の前記粘着剤層の外側に形成されている、積層テープ又はシート。
項12. 前記セパレーターは、両側の前記粘着剤層のそれぞれの外側に形成されている、項11に記載の積層テープ又はシート。
項13.支持体及び該支持体の両面に形成された2つの粘着剤層からなる積層体を含む両面粘着テープ又はシートの製造方法であって、
ポリプロピレン系樹脂を含む原料で前記支持体を形成する工程、及び、
アクリル系粘着剤を含むアクリル系粘着組成物で前記粘着剤層を形成する工程を備え、
前記積層体の総厚み(Ds)が4~15μmであり、
前記支持体の厚み(Dp)と、前記積層体の総厚み(Ds)との比Dp/Dsの値が0.15~0.6である、製造方法。
項14.セパレーターに前記粘着剤層を形成する工程、
前記支持体の片面又は両面に前記セパレーターの粘着剤層が形成されている側の面を貼り合わせて積層テープ又はシートを製造する工程、及び、
前記積層テープ又はシートから前記セパレーターを剥離する工程、
を備える、項13に記載の製造方法。
項15.前記ポリプロピレン系樹脂を含む原料は、該原料の全質量に対して、メソペンタッド分率が90~99.5%であるアイソタクチックホモポリプロピレンを80~100質量%含有する、項13又は14のいずれか1項に記載の製造方法。
項16.セパレーターに粘着剤層を形成する工程、及び、
支持体の片面又は両面に前記セパレーターの粘着剤層が形成されている側の面を貼り合わせる工程、
を備える、項13~15のいずれか1項に記載の積層テープ又はシートの製造方法。
本発明は、支持体及び該支持体の両面に形成された2つの粘着剤層からなる積層体を含む両面粘着テープ又はシートであって、
前記支持体はポリプロピレン系樹脂を含み、
前記粘着剤層は、アクリル系粘着組成物を含み、
前記積層体の総厚み(Ds)が4~15μmであり、
前記支持体の厚み(Dp)と、前記積層体の総厚み(Ds)との比Dp/Dsの値が、0.15~0.6であり、
前記積層体の密度が0.90~1.10g/cm3である。
以下、本発明の両面粘着テープ又はシートの構成について詳述する。
支持体は、粘着剤層を支持するための構成部材であり、長尺のテープ状又はシート状に形成されている。
支持体は、ポリプロピレン系樹脂を含む。
支持体に含まれるポリプロピレン系樹脂は、1種単独であってもよいし、あるいは、2種以上であってもよい。
支持体は、例えば、ポリプロピレン系樹脂を含む原料(以下当該原料をポリプロピレン系樹脂組成物ともいう)を用いて形成することができる。この支持体形成工程では、例えば、ポリプロピレン系樹脂組成物をシート状に押出成型した後、これを二軸延伸することによって、支持体が形成され得る。
粘着剤層は、両面粘着テープ又はシートとしての粘着性能を発揮する層である。
架橋性アクリル共重合体(A)は、非架橋性(メタ)アクリル酸エステル単位(a1)と、架橋性官能基を有するアクリル単量体単位(a2)を含有する。
アクリル系粘着組成物は、粘着力の調整、粘着層の耐久性の向上、支持体との密着性の改善等のため、架橋剤(B)を含有するのが好ましい。架橋剤(B)は、架橋性アクリル共重合体(A)を架橋させるための成分である。特に、架橋剤(B)は、架橋性アクリル共重合体(A)中の架橋性アクリル単量体単位(a2)の架橋性官能基と反応することができる成分である。架橋剤(B)は、架橋性アクリル単量体単位(a2)の架橋性官能基と反応することができる限りは、その種類は特に限定されず、公知の架橋剤を広く用いることができる。
架橋剤(B)としては1種を単独で用いても2種以上を併用してもよく、2種以上を併用する場合は、合計質量が上記範囲内であることが好ましい。
アクリル系粘着組成物は、その他の成分を含有してもよい。その他の成分としては、重合開始剤、可塑剤、任意成分が挙げられる。
粘着剤層は、アクリル系粘着組成物を用いて形成することができる。
塗工により粘着剤層を形成する場合、アクリル系粘着組成物は無溶剤でも良く、また、その含有成分を溶解及び/又は分散させるための溶剤を含んでもよい。
アクリル系粘着組成物が溶剤を含む場合は、溶剤を乾燥させる工程としては、加熱炉(ドライヤー)、赤外線ランプ等の公知の加熱装置を用いることができる。
積層体は、支持体及び該支持体の両面に形成された2つの粘着剤層(第1の粘着剤層、第2の粘着剤層)から形成される。
本発明の両面粘着テープ又はシートを用いることで、積層テープ又はシートを形成することができる。
本発明の積層テープ又はシートにおけるセパレーターは、剥離性を有する。当該セパレーターの積層構成としては、(i)基材のみの1層構成、(ii)基材及び離型層が順に形成された2層以上の構成、などが挙げられる。ここで、セパレーターは少なくとも基材を含む。
セパレーターの離型層は、シリコーン系剥離剤、フッ素系剥離剤、長鎖アルキル系剥離剤などの剥離剤より形成することができる。
上記の両面粘着テープ又はシートの製造方法は、例えば、前述のポリプロピレン系樹脂組成物で前記支持体を形成する工程、及び、前述のアクリル系粘着組成物で前記粘着剤層を形成する工程を備える製造方法によって、両面粘着テープ又はシートを製造することができる。
上記製造方法によれば、簡便な方法で両面粘着テープ又はシートを製造することができる。
MFRが4.9g/10分であり、融点が164℃であり、メソペンタッド分率が97%である(株)プライムポリマー社製のアイソタクチックホモポリプロピレン樹脂を、一軸押出機に供給して240℃で溶融した。その後、溶融させた樹脂を、濾過精度10μmの焼結金属不織布フィルターにて濾過し、Tダイを用いて押出した。次いで、表面温度を90℃に保持した金属ドラムにて冷却固化させ、厚さ約120μmの原反シートを作製した。この原反シートを、周速差を設けた2つの加熱ロール(温度142℃)間で流れ方向に5倍に延伸し、次いで、テンターにて158℃のオーブンで加熱し、横方向に10倍に延伸した後、9.5倍まで緩和した。厚さ3.5μmの二軸延伸ポリプロピレン系フィルムを支持体として得た。支持体の密度は0.918g/cm3であった。支持体の両表面には、その表面のぬれ張力(JIS K-6768(1999))が40mN/mとなるようにコロナ処理を施した。
表1に示すように、実施例1において、支持体の厚み、粘着剤層の厚みのいずれか1つ以上の条件を変更したこと以外は、実施例1と同様の方法で積層シートを得た。
ポリプロピレン系樹脂として、MFRが3.1g/10分であり、融点が159℃であり、メソペンタッド分率が92%である(株)プライムポリマー社製のアイソタクチックホモポリプロピレン樹脂を用いた以外は、実施例1と同様の方法で、積層シートを得た。なお形成された支持体の密度は0.909g/cm3であった。
支持体として、市販の二軸延伸ポリエチレンテレフタレートフィルム(東レ株式会社製ルミラー(登録商標)F53、厚み3.5μm、密度1.44g/cm3)を使用した以外は実施例1と同様の方法で積層シートを得た。
[樹脂のメルトマスフローレート(MFR)]
JIS K-7210(1999)に準じて、株式会社東洋精機製作所製メルトインデックサを用いて、測定温度230℃および荷重21.18Nの条件で測定した。本評価におけるMFRの単位はg/10分である。
パーキン・エルマー社製入力補償型DSC、DiamondDSCを用い、以下の手順により算出した。測定用の樹脂(原料である樹脂)を5mg量り取り、アルミニウム製のサンプルホルダーに詰め、DSC装置にセットした。窒素流下、30℃から280℃まで20℃/分の速度で昇温し、280℃で5分間保持し、20℃/分で30℃まで冷却し、30℃で5分間保持した。その後再び20℃/分で280℃まで昇温する際のDSC曲線より融点を求めた。JIS-K7121の9.1(1)に定める融解ピーク(複数の融解ピークを示す場合は最大の融解ピーク)を測定して、融点を求めた。
積層シート(第1のセパレーター、第1の粘着剤層、支持体、第2の粘着剤層、第2のセパレーターの5層構成である)の総厚みは、山文電機株式会社製卓上型接触式厚み計TOF-5R01を用いて、JIS-C2330に準拠して測定した。
JIS K-7112(1999)D法に準拠して測定し、単位g/cm3に換算した。
JIS K-7127(1999)に準拠し、サンプル形状は試験片タイプ2に準拠したもの(サンプル幅15mm、サンプル長さ160mm)を用い、引張試験機(ミネベア株式会社製 万能引張試験機 テクノグラフTGI-1kN)を用いて、23℃、試験速度200mm/分、チャック間距離100mmの条件にて、幅方向及び流れ方向について、破断時の応力を測定した。流れ方向の引張弾性率及び伸度を測定する際は、流れ方向の長さ160mm、幅方向の幅15mmで切り出した試験片を用い、幅方向の引張弾性率及び伸度を測定する際は、幅方向の長さ160mm、流れ方向の幅15mmで切り出した試験片を用いて測定を行った。
実施例及び比較例で得られた積層シート(第1のセパレーター、第1の粘着剤層、支持体、第2の粘着剤層、第2のセパレーターの5層構成である)より第1のセパレーターを剥離し、表面に現れた第1の粘着剤層を下部電極であるアルミ箔に貼りつけた。さらに第2のセパレーターを剥離し、表面に現れた第2の粘着剤層の面上に上部電極を置き、JIS C2330(2001)7.4.11.2 B法(平板電極法)に準じて、直流電源を使用し、100℃で、絶縁破壊電圧値を12回測定した。測定には、菊水電子工業株式会社製DC耐電圧・絶縁抵抗試験機TOS9213ASを用いた。12回の測定結果中の上位2回および下位2回を除いた8回の平均値を、絶縁破壊電圧(kV)とした。
JIS Z-0237(2009)方法3(両面粘着テープをステンレス試験板に対して180°に引きはがす試験方法)に準拠して粘着力を測定し、25mm幅の値に換算し、以下の基準で判定した。
◎:粘着力の測定が可能であり、且つ、前記粘着力が2N/25mm以上であった(使用可能)。
○:粘着力の測定が可能であり、且つ、前記粘着力が1N/25mm以上2N/25mm未満であった(使用可能)。
△:粘着力の測定が可能であり、且つ、前記粘着力が1N/25mm未満であった(使用に難有り)。
×:積層体がステンレス試験板に粘着しない、または容易に剥離し粘着力を測定できなかった(使用不可)。
10:積層体
11:支持体
12:粘着剤層
12a:第1の粘着剤層
12b:第2の粘着剤層
13:セパレーター
2:積層テープ又はシート
Ds:積層体の総厚み
Dp:支持体の厚み
Claims (12)
- 支持体及び該支持体の両面に形成された2つの粘着剤層からなる積層体を含む両面粘着テープ又はシートであって、
前記支持体はポリプロピレン系樹脂を含み、
前記粘着剤層はアクリル系重合体を含み、
前記積層体の総厚み(Ds)が4~15μmであり、
前記支持体の厚み(Dp)と、前記積層体の総厚み(Ds)との比Dp/Dsの値が、0.15~0.6であり、
前記積層体の密度が0.90~1.10g/cm3であり、
前記支持体の厚み(Dp)が1.5~6μmである、両面粘着テープ又はシート。 - 前記比Dp/Dsの値が0.18~0.35であり、
前記積層体の密度が0.90~1.07g/cm3である、
請求項1に記載の両面粘着テープ又はシート。 - 前記支持体の厚み(Dp)が1.7~5μmである、請求項1又は2に記載の両面粘着テープ又はシート。
- 前記支持体が密度0.90~0.94g/cm3の二軸延伸ポリプロピレン系フィルムである、請求項1~3のいずれか1項に記載の両面粘着テープ又はシート。
- 前記支持体は、該支持体の全質量に対して、メソペンタッド分率が90~99.5%であるアイソタクチックホモポリプロピレンを80~100質量%含有する、請求項1~4のいずれか1項に記載の両面粘着テープ又はシート。
- 前記粘着剤層が、非架橋性(メタ)アクリル酸エステル単位(a1)を含むアクリル共重合体を主成分とする、
請求項1~5のいずれか1項に記載の両面粘着テープ又はシート。 - 前記粘着剤層は、アクリル系粘着組成物が固形化された層であり、
前記アクリル系粘着組成物は、非架橋性(メタ)アクリル酸エステル単位(a1)と、架橋性官能基を有する架橋性アクリル単量体単位(a2)を含有する架橋性アクリル共重合体(A)を主成分とする、
請求項1~6のいずれか1項に記載の両面粘着テープ又はシート。 - 前記非架橋性(メタ)アクリル酸エステル単位(a1)がアクリル酸n-ブチル単量体単位及びアクリル酸メチル単量体単位の二種であり、前記架橋性官能基を有する架橋性アクリル単量体単位(a2)がアクリル酸単量体単位であり、
前記架橋性アクリル共重合体(A)において、前記アクリル酸n-ブチル単量体単位が45~84質量%であり、前記アクリル酸メチル単量体単位が15~54質量%であり、前記アクリル酸単量体単位が1~10質量%である、請求項7に記載の両面粘着テープ又はシート。 - 前記粘着剤層は、アクリル系粘着組成物が固形化された層であり、
前記アクリル系粘着組成物が、架橋剤(B)を含有する、請求項1~8のいずれか1項に記載の両面粘着テープ又はシート。 - 前記架橋剤(B)が、N,N,N’,N’-テトラグリシジル-m-キシレンジアミン及び1,3-ビス(N,N-ジグリシジルアミノメチル)シクロヘキサンからなる群から選ばれた少なくとも一種である、請求項9に記載の両面粘着テープ又はシート。
- 請求項1~10のいずれか1項に記載の両面粘着テープ又はシートと、セパレーターとを備え、
前記セパレーターは、前記両面粘着テープ又はシートの少なくとも片側の前記粘着剤層の外側に形成されている、積層テープ又はシート。 - 前記セパレーターは、両側の前記粘着剤層のそれぞれの外側に形成されている、請求項11に記載の積層テープ又はシート。
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