JP2019156914A - 電気剥離型粘着シート、接合体、並びに被着体の接合及び分離方法 - Google Patents
電気剥離型粘着シート、接合体、並びに被着体の接合及び分離方法 Download PDFInfo
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- JP2019156914A JP2019156914A JP2018042353A JP2018042353A JP2019156914A JP 2019156914 A JP2019156914 A JP 2019156914A JP 2018042353 A JP2018042353 A JP 2018042353A JP 2018042353 A JP2018042353 A JP 2018042353A JP 2019156914 A JP2019156914 A JP 2019156914A
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- pressure
- sensitive adhesive
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- C—CHEMISTRY; METALLURGY
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Abstract
Description
また、電気剥離型粘着剤層に電圧を印加するためにこの基材層は導電性を有する必要があるが、例えば基材として金属箔を用いた場合には、粘着シートの打ち抜き加工時にバリが発生しやすくなる。このようなバリが存在すると、金属箔と被着体とが短絡し、電気剥離型粘着剤層に電圧を印加できなくなる恐れがある。
したがって、電気剥離型粘着シートに用いる基材としては、例えばPETフィルムなどの基材層の上に、金属蒸着薄膜などの導電層を形成した、通電用基材をもちいることが好ましい。
従って、電気剥離型粘着剤層により安定して電圧を印加できるような接合体を製造することができる電気剥離型粘着シートが望まれていた。
<粘着シート>
図1は、本発明の第1の実施形態に係る電気剥離型粘着シート10(以下、単に「本実施形態の粘着シート10」や「粘着シート10」ともいう)の概略図である。本実施形態の粘着シート10は、導電層12aと基材層12bとを備える通電用基材12と、通電用基材12の導電層12a上に形成された電気剥離用粘着剤からなる第1の粘着剤層11と、通電用基材12の基材層12b上に形成された第2の粘着剤層13とを備える電気剥離型粘着シートであって、第1の粘着剤層11及び通電用基材12が、電気剥離型粘着シート10の面広がり方向において第2の粘着剤層13よりも伸びて延出する第1の延出部14と、第1の延出部から、通電用基材12が電気剥離型粘着シート10の面広がり方向において第1の粘着剤層11よりも伸びて延出する第2の延出部15とを有する。
まず、第1の実施形態の粘着シートを構成する各層や各延出部について説明する。
コストの抑制や高い生産性の実現という観点からは、アクリル系ポリマーを含有することが好ましい。アクリル系ポリマーとは、アクリル酸アルキルエステルおよび/またはメタクリル酸アルキルエステルに由来するモノマーユニットを、質量比で最も多い主たるモノマーユニットとして含む重合体である。以下では、「(メタ)アクリル」をもって、「アクリル」および/または「メタクリル」を表す。
第2の粘着剤層13の厚さは特に限定されないが、第2の粘着剤層13において良好な粘着性を実現するという観点から、好ましくは1μm以上、より好ましくは3μm以上、さらに好ましくは5μm以上、特に好ましくは8μm以上である。また、好ましくは1000μm以下、より好ましくは500μm以下、さらに好ましくは100μm以下である。
粘着シート10の各粘着面、即ち、第1の粘着剤層11側の表面及び第2の粘着剤層13の側の表面については、良好な接着力を実現するという観点から、その180°剥離粘着力(対SUS304板,引張速度300mm/分,剥離温度23℃)が0.1N/10mm以上であることが好ましい。粘着シート10の180°剥離粘着力については、例えば以下のようにして、JIS Z 0237に準じて測定することができる。
まず、両面にセパレーターを伴う粘着シート10について、一方のセパレーターを剥がした後、露出した粘着面に厚さ50μmのポリエチレンテレフタレート(PET)フィルムに貼り付けて、粘着シート10を裏打ちする。次に、この裏打ちされた粘着シート10から試験片(幅10mm×長さ100mm)を切り出す。次に、この試験片から他方のセパレーターを剥がし、試験片を被着体たるステンレス板(SUS304)に貼り合わせた後、2kgのローラーを1往復させることによって試験片と被着体とを圧着させる。そして、30分間静置した後、剥離試験機(商品名「変角ピール測定機YSP」,旭精工株式会社製)を使用して、180°剥離粘着力(引張速度:300mm/分,剥離温度23℃)を測定する。
粘着シート10の製造においては、例えば、まず、第1の粘着剤層11を形成するための粘着剤組成物(第1組成物)、および、第2の粘着剤層13を形成するための粘着剤組成物(第2組成物)を、それぞれ作製する。次に、第1組成物を通電用基材12の導電層12aの側に塗布してこれを乾燥させる。これによって第1の粘着剤層11が形成される。次に、第2組成物を通電用基材12の基材層12bの側に塗布してこれを乾燥させる。これによって第2の粘着剤層13が形成される。例えばこのようにして、粘着シート10を製造することができる。
次に、第1の実施形態の粘着シート10を用いて得られる接合体、並びに、第1の実施形態の粘着シート10を用いた被着体の接合及び剥離方法について説明する。
図3は、本発明の第1の実施形態に係る接合体40(以下、単に「本実施形態の接合体40」や「接合体40」ともいう)の分解図であり、図4は、図3の点線部の拡大図である。
また、第1の延出部14が第1の粘着剤層11及び通電用基材12からなること、即ち、第1の延出部14には第2の粘着剤層13が存在しないことにより、折り返しによる厚みの増加は最小限に抑えられ、安定した接合及び、第2の被着体30と導電層12aの安定した導通の確保を達成することができる。
本実施形態の接合体40においては、粘着シート10の導電層12aが第2の被着体30と電気的に接触しており、第1の被着体20及び第2の被着体30に電圧印加デバイスの端子を接触させて電圧の印加を行えるため、安定して電圧の印加を行える。
なお、電圧印加時には、図6に示すように同じ方向から第1の被着体20及び第2の被着体30に電圧印加デバイスの端子を接触させることが、作業性の観点から特に好ましい。
また、第1の粘着剤層11に対する電圧の印加時間は短いことが好ましく、具体的には、好ましくは60秒以内、より好ましくは40秒以内、より好ましくは20秒以内である。このような範囲内であると、接合体の分離作業の効率化を図るうえで好適である。
これら好ましい印加電圧や好ましい印加時間については、後述の第2の実施形態においても同様である。
<粘着シート>
図7は、本発明の第2実施形態に係る電気剥離型粘着シート110(以下、単に「本実施形態の粘着シート」や「粘着シート110」ともいう)の概略図である。本実施形態の粘着シート110は、導電層112aと基材層112bとを備える通電用基材112と、通電用基材112の導電層112a上に形成された電気剥離用粘着剤からなる第1の粘着剤層111と、通電用基材112の基材層112b上に形成された第2の粘着剤層113とを備える電気剥離型粘着シート110であって、第2の粘着剤層113及び通電用基材112が、電気剥離型粘着シート110の面広がり方向において第1の粘着剤層111よりも伸びて延出する延出部114を有する。
次に、第2の実施形態の粘着シート110を用いて得られる接合体、並びに、第2の実施形態の粘着シート110を用いた被着体の接合及び剥離方法について説明する。
図8は、本発明の第2の実施形態に係る接合体140(以下、単に「本実施形態の接合体140」や「接合体140」ともいう)の分解図であり、図9は、図8の点線部の拡大図である。
本実施形態の接合体140の電気剥離の際の概略図を図11に示す。このような接合体140においては、粘着シート110の第1の粘着剤層111に対し、第1の被着体120及び第2の被着体130を挟み込むようにして折り返された延出部の導電層112aを介して電圧を印加することが可能であるため、安定して電圧を印加できる。
なお、電圧印加時には、図11に示すように同じ方向から電圧印加デバイスの端子を接触させることが、作業性の観点から特に好ましい。
なお、電圧印加時には、図11に示すように同じ方向から第1の被着体120及び第2の被着体130に電圧印加デバイスの端子を接触させることが、作業性の観点から特に好ましい。
11、111:第1の粘着剤層
12、112:通電用基材
12a、112a:導電層
12b、112b:基材層
13、113:第2の粘着剤層
14:第1の延出部
15:第2の延出部
20、120:第1の被着体
30、130:第2の被着体
40、140:接合体
50、60、150、160:端子
114:延出部
Claims (6)
- 導電層と基材層とを備える通電用基材と、前記通電用基材の導電層上に形成された電気剥離用粘着剤からなる第1の粘着剤層と、前記通電用基材の基材層上に形成された第2の粘着剤層とを備える電気剥離型粘着シートであって、
前記第1の粘着剤層及び前記通電用基材が、前記電気剥離型粘着シートの面広がり方向において前記第2の粘着剤層よりも伸びて延出する第1の延出部と、前記第1の延出部から、前記通電用基材が前記電気剥離型粘着シートの面広がり方向において前記第1の粘着剤層よりも伸びて延出する第2の延出部とを有する、電気剥離型粘着シート。 - 請求項1に記載の電気剥離型粘着シートと、第1の被着体と、第2の被着体とを備える接合体であって、
前記電気剥離型粘着シートの前記第1の延出部は、前記第2の粘着剤層の方向に折り返されており、
前記第1の被着体は、前記第1の粘着剤層の折り返されていない部分により前記電気剥離型粘着シートに貼着されており、
前記第2の被着体は、前記第2の粘着剤層と、前記第1の粘着剤層の折り返された部分とにより前記電気剥離型粘着シートに貼着されており、前記第2の延出部における導電層と接触している、接合体。 - 請求項1に記載の電気剥離型粘着シートの前記第1の延出部を前記第2の粘着剤層の方向に折り返し、前記第1の粘着剤層の折り返されていない部分に第1の被着体を貼着し、前記第2の粘着剤層及び前記第1の粘着剤層の折り返された部分に第2の被着体を貼着して前記第1の被着体と前記第2の被着体とを接合した後、前記第1の粘着剤層に厚さ方向に電位差を生じるように電圧を印加し、前記第1の被着体と前記第2の被着体とを分離させる、被着体の接合及び分離方法。
- 導電層と基材層とを備える通電用基材と、前記通電用基材の導電層上に形成された電気剥離用粘着剤からなる第1の粘着剤層と、前記通電用基材の基材層上に形成された第2の粘着剤層とを備える電気剥離型粘着シートであって、
前記第2の粘着剤層及び前記通電用基材が、前記電気剥離型粘着シートの面広がり方向において前記第1の粘着剤層よりも伸びて延出する延出部を有する、電気剥離型粘着シート。 - 請求項4に記載の電気剥離型粘着シートと、第1の被着体と、第2の被着体とを備える接合体であって、
前記第2の被着体は、前記第2の粘着剤層により前記電気剥離型粘着シートに貼着されており、
前記電気剥離型粘着シートは、前記第2の被着体の端部に沿って前記第2の被着体を挟み込むように折り返されており、前記延出部の少なくとも一部が前記第2の粘着剤層により前記第2の被着体の前記第1の被着体とは反対側の面に貼着されており、
前記第1の被着体は、前記第1の粘着剤層の折り返されていない部分により前記電気剥離型粘着シートに貼着されている、接合体。 - 請求項4に記載の電気剥離型粘着シートを、第2の被着体の端部に沿って第2の被着体を挟み込むように折り返して、前記第2の粘着剤層により第2の被着体に貼付し、前記第1の粘着剤層の折り返されていない部分を第1の被着体に貼付し、前記延出部の少なくとも一部が前記第2の粘着剤層により前記第2の被着体の前記第1の被着体とは反対側の面に貼着されているようにして、前記第1の被着体と前記第2の被着体とを接合した後、前記第1の粘着剤層に厚さ方向に電位差を生じるように電圧を印加し、前記第1の被着体と前記第2の被着体とを分離させる、被着体の接合及び分離方法。
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