JP2015120774A - 両面粘着テープ - Google Patents
両面粘着テープ Download PDFInfo
- Publication number
- JP2015120774A JP2015120774A JP2013263821A JP2013263821A JP2015120774A JP 2015120774 A JP2015120774 A JP 2015120774A JP 2013263821 A JP2013263821 A JP 2013263821A JP 2013263821 A JP2013263821 A JP 2013263821A JP 2015120774 A JP2015120774 A JP 2015120774A
- Authority
- JP
- Japan
- Prior art keywords
- sensitive adhesive
- pressure
- double
- adhesive tape
- adhesive layer
- 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.)
- Granted
Links
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Abstract
Description
前記発泡体基材が、密度0.45g/cm3以下、層間強度10N/cm以上の発泡体基材であり、前記粘着剤層が、厚さ25μmのポリエチレンテレフタレート基材に厚さ25μmの粘着剤層を設けて形成した粘着テープを、温度23℃、相対湿度65%RHの環境下でアルミニウム板に対し、2kgローラーを使用して圧着回数一往復で圧着し、温度23℃、相対湿度50%RHの環境下に1時間静置した後の剥離速度300mm/minにおける180°引き剥がし接着力が10N/20mm以上の粘着剤層であることを特徴とする両面粘着テープにより上記第二の課題を解決する。
本発明に使用する発泡体基材としては、密度が0.45g/cm3以下であるものを使用することが好ましく、0.1g/cm3〜0.45g/cm3であるものを使用することがより好ましく、0.15g/cm3〜0.42g/cm3であるものを使用することが、一定の力が加わった際の好適な解体性を備えた両面粘着テープを得ることができるためさらに好ましい。
前記樹脂フィルムは、前記発泡体基材の一方の面に積層される。
本発明の両面粘着テープは、粘着剤層(a1)と粘着剤層(a2)とを有する。前記粘着剤層(a1)と粘着剤層(a2)とは、同一の組成や厚さや粘着力を備えたものであってもよく、それぞれ異なる組成や厚さや粘着力を備えたものであってもよい。
サンプル注入量:100μl
溶離液:THF
流速:1.0ml/分
測定温度:40℃
本カラム:TSKgel GMHHR−H(20)2本
ガードカラム:TSKgel HXL−H
検出器:示差屈折計
スタンダードポリスチレン分子量:1万〜2000万(東ソー株式会社製)
本発明の両面粘着テープは、それを構成する前記粘着剤層(a1)及び前記粘着剤層(a2)の表面に、それぞれ離型ライナーが積層されていてもよい。前記離型ライナーは、両面粘着テープを被着体に貼付する際に剥離され除去される。
本発明の両面粘着テープは、薄型の構成であっても好適な耐衝撃性を有すると共に、一定の力が加わった際には発泡体基材が層間割れを生じて好適に解体でき、かつ、解体後に被着体の表面に残存した糊などの残存物を容易に剥離し取り除くことのできる両面粘着テープである。このため、小型電子機器の部品固定用途、特に、小型電子機器の情報表示部の保護パネルや画像表示モジュール、薄型電池などの解体時に大きな力が加わりやすい板状剛体部品の固定用途に好適に適用できる。
攪拌機、還流冷却器、温度計、滴下漏斗および窒素ガス導入口を備えた反応容器に、n−ブチルアクリレート97.97質量部、アクリル酸2.0質量部、4−ヒドロキブチルアクリレート0.03質量部、重合開始剤として2、2’−アゾビスイソブチロニトリル0.1質量部とを、酢酸エチル100質量部からなる溶剤に溶解し、70℃で12時間重合して、重量平均分子量が200万(ポリスチレン換算)のアクリル系共重合体を得た。次に、アクリル系共重合体100質量部に対し、荒川化学社製「スーパーエステルA100」(不均化ロジンのグリセリンエステル)25質量部と、荒川化学社製「ペンセルD135」(重合ロジンのペンタエリスリトールエステル)5質量部、三井化学製FTR6100(スチレン系石油樹脂)20質量部を添加、酢酸エチルを加えて均一に混合し、不揮発分40質量%の粘着剤組成物(a)を得た。
剥離処理した厚さ75μmのポリエチレンテレフタレートフィルムの剥離処理面に、乾燥後の粘着剤層の厚さが25μmとなるように前記粘着剤(A)を塗工し、80℃で3分乾燥した後、厚さ25μmのポリエチレンテレフタレート基材に貼りあわせ40℃環境下で48時間熟成することによって粘着テープを得た。
攪拌機、還流冷却器、温度計、滴下漏斗および窒素ガス導入口を備えた反応容器に、n−ブチルアクリレート93.4質量部、アクリル酸3.5質量部、酢酸ビニル3質量部、2−ヒドロキシエチルアクリレート0.1質量部、重合開始剤として2、2’−アゾビスイソブチロニトリル0.1質量部とを、酢酸エチル100質量部からなる溶剤に溶解し、70℃で12時間重合して、重量平均分子量が160万(ポリスチレン換算)のアクリル系共重合体を得た。次に、アクリル系共重合体100質量部に対し、荒川化学社製「スーパーエステルA100」(不均化ロジンのグリセリンエステル)30質量部と、三井化学製FTR6100(スチレン系石油樹脂)25質量部、荒川化学社製「ペンセルD135」(重合ロジンのペンタエリスリトールエステル)5質量部を添加し、酢酸エチルを加えて均一に混合し、不揮発分38質量%の粘着剤組成物(b)を得た。
上記で調製した粘着剤(A)を、剥離処理した厚さ75μmのポリエチレンテレフタレートフィルムの剥離処理面に、乾燥後の粘着剤層の厚さが25μmとなるように塗工し、80℃で3分間乾燥することによって、厚さ25μmの粘着剤層を有するポリエチレンテレフタレートフィルムを作製した。
前記積層体の樹脂フィルム側の粘着剤層の乾燥後の厚さを15μmにしたこと以外は、実施例1と同様の方法で厚さ140μmの両面粘着テープを得た。
前記積層体の樹脂フィルム側及び発泡体側の粘着剤層の乾燥後の厚さを45μmにしたこと以外は、実施例1と同様の方法で厚さ200μmの両面粘着テープを得た。
黒色ポリオレフィン系発泡体(1)の代わりに黒色ポリオレフィン系発泡体(2)(厚さ:80μm、密度0.40g/cm3、層間強度10.2N/cm、25%圧縮強度:92kPa、流れ方向の引張強さ:1062N/cm2、幅方向の引張強さ:962N/cm2、積水化学工業株式会社製、表面をコロナ処理で濡れ指数54mN/mとしたもの)を用い、かつ、前記積層体の樹脂フィルム側の粘着剤層の乾燥後の厚さを15μmにしたこと以外は、実施例1と同様の方法で厚さ120μmの両面粘着テープを得た。
黒色ポリオレフィン系発泡体(1)の代わりに黒色ポリオレフィン系発泡体(3)(厚さ:100μm、密度0.45g/cm3、層間強度16.2N/cm、25%圧縮強度:190kPa、流れ方向の引張強さ:964N/cm2、幅方向の引張強さ:861N/cm2、積水化学工業株式会社製、表面をコロナ処理で濡れ指数54mN/mとしたもの)を用いたこと以外は、実施例1と同様の方法で厚さ150μmの両面粘着テープを得た。
前記積層体の樹脂フィルム側及び発泡体側の粘着剤層の乾燥後の厚さを45μmにしたこと以外は、実施例5と同様の方法で厚さ200μmの両面粘着テープを得た。
黒色ポリオレフィン系発泡体(1)の代わりに黒色ポリオレフィン系発泡体(4)(厚さ:140μm、密度0.40g/cm3、層間強度19.1N/cm、25%圧縮強度:130kPa、流れ方向の引張強さ:994N/cm2、幅方向の引張強さ:713N/cm2、積水化学工業株式会社製、表面をコロナ処理で濡れ指数54mN/mとしたもの)を用い、かつ、前記積層体の樹脂フィルム側及び発泡体側の粘着剤層の乾燥後の厚さを25μmにしたこと以外は、実施例1と同様の方法で厚さ200μmの両面粘着テープを得た。
ポリエチレンテレフタレート(厚さ6μm)からなる樹脂フィルムの代わりに、ポリエチレンテレフタレート(厚さ3μm)からなる樹脂フィルムを用い、かつ、樹脂フィルム側の粘着剤層の乾燥後の厚さを28μmにしたこと以外は、実施例1と同様の方法で両面粘着テープを得た。
ポリエチレンテレフタレート(厚さ6μm)からなる樹脂フィルムの代わりに、ポリエチレンテレフタレート(厚さ16μm)からなる樹脂フィルムを用いること以外は、実施例1と同様の方法で両面粘着テープを得た。
前記粘着剤組成物(A)の代わりに、前記粘着剤組成物(B)を使用すること以外は、実施例1と同様の方法で厚さ150μmの両面粘着テープを得た。前記両面粘着テープを構成する粘着剤(B)層のゲル分率は40質量%であった。
前記ウレタン系白色接着剤の代わりに、1,4−ブタンジオールとネオペンチルグリコールとアジピン酸とを反応させて得られる数平均分子量2,000のポリエステルポリオール、ポリオキシテトラメチレングリコール、エチレングリコール、及び、4,4’−ジフェニルメタンジイソシアネートを反応させて得られる重量平均分子量100,000のウレタン樹脂のジメチルホルムアミド溶液〔不揮発分30質量%〕からなるウレタン系接着剤を使用すること以外は、実施例1と同様の方法で厚さ150μmの両面粘着テープを得た。
樹脂フィルムを使用しないこと、及び、粘着剤層の乾燥後の厚さを両面25μmにしたこと以外は、実施例1と同様の方法で厚さ150μmの両面粘着テープを得た。
尾崎製作所製のダイヤルシクネスゲージG型を用いて測定した。粘着テープの場合は、剥離フィルムを剥がしたのち測定した。
密度はJISK6767に準じて測定した。4cm×5cmの長方形に切断した発泡体基材を約15cm3用意し、その質量を測定して密度を求めた。
発泡体基材の両面に、厚さ50μmの強粘着性(下記高速剥離試験時に被着体および発泡体基材から剥離しないもの)の粘着剤層を1枚ずつ貼り合わせたのち、40℃で48時間熟成し、層間強度測定用の両面粘着テープを作製した。次に、片側の粘着面を厚さ25μmのポリエステルフィルムで裏打ちした幅1cm、長さ15cm(発泡体基材の流れ方向と幅方向)の両面粘着テープ試料を、23℃及び50%RH下で厚さ50μm、幅3cm、長さ20cmのポリエステルフィルムに2kgローラー1往復で加圧貼付し60℃で48時間静置した。23℃で24時間静置後、23℃及び50%RH下で厚さ50μmmのポリエステルフィルムと貼り合わせた側を高速剥離試験機の取り付け治具に固定し、厚さ25μmのポリエステルフィルムを引張速度15m/分で90度方向に引っ張り発泡体を引き裂いた際の最大強度を測定した。
発泡体基材の流れ方向と幅方向の引張強さは、JISK6767に準じて測定した。標線長さ2cm、幅1cmの発泡体基材を、テンシロン引張試験機を用い、23℃及び50%RHの環境下において、引張速度300mm/minの測定条件で測定した。得られた測定値の最大強度が発泡体基材の引張強度である。
発泡体基材の25%圧縮強度は、JISK6767に準じて測定した。25角に切断した試料を厚さ約10mmになるまで重ね合わせた。発泡体基材より大きな面積のステンレス板で発泡体基材をはさみ、23℃下で10mm/分の速度で発泡体基材を約2.5mm(もとの厚さの25%分)圧縮した時の強度を測定した。
まず、発泡体基材を幅方法、流れ方向とも1cmに切断した。次に、切断した発泡体基材の切断面中央部分をデジタルマイクロスコープ(商品名「KH−7700」、HiROX社製)により、発泡体気泡部分を200倍に拡大したのち、発泡体基材の幅方向または流れ方向の断面を発泡体基材の切断面がその基材厚さ方向の全長を観察した。得られた拡大画像において、流れ方向または幅方向の拡大前の実際の長さが2mm分の切断面に存在する気泡の気泡径を全て測定し、その平均値から平均気泡径を算出した。任意の10カ所で測定した結果から平均気泡径を求めた。
実施例及び比較例で得た両面粘着テープを構成する各粘着剤層を目視で確認し、樹脂フィルムに積層された粘着剤層と、発泡体基材の他方の面に積層された粘着剤層とを目視で区別できたものを「○」、区別できなかったものを「×」と評価した。
1)実施例及び比較例で得た両面粘着テープを、長さ2cm(発泡体基材の流れ方向)、幅1cmに裁断したものを試験片とした。前記試験片を、縦2.5cm、横4.0cm、2mm厚のポリカーボネート板の中心に幅方向に2cmの間隔をあけて2枚貼付した。
上記易解体性の試験後に残った両面粘着テープの残存物の端部をつまみあげ、135°方向に600mm/minでゆっくりと手剥がしにて剥離した。その際の残存物の剥離除去の状態を観察した。
1)厚さ2mm、外形50mm×50mmのアクリル板(三菱レイヨン(株)アクリライトL「商標名」、色相:透明)に、長さ40mm、幅5mmの2枚の両面粘着テープの弱粘着面を40mmの間隔をあけて平行に貼付(図1)したのち、厚さ2mm、外形150mm×100mmのABS板(住友ベークライト社製、タフエースR「商標名」色相:ナチュラル、シボなし、以下同じ)の中央部に貼付した(図2)。2kgローラーで1往復加圧したのち、23℃で1時間静置して試験片とした。
×:高さ60cm以下でテープの剥がれ又は破壊が生じた
2 アクリル板
3 ABS板
4 コの字型測定台
5 撃芯
Claims (7)
- 発泡体基材の一方の面に、接着剤層を介して樹脂フィルムが積層され、前記樹脂フィルムの表面に粘着剤層(a1)が積層され、前記発泡体基材の他方の面に粘着剤層(a2)が積層された両面粘着テープであって、前記接着剤層が、着色された接着剤層であることを特徴とする両面粘着テープ。
- 総厚さが300μm以下である請求項1に記載の両面粘着テープ。
- 前記発泡体基材の引張強さが、500N/cm2〜1300N/cm2である請求項1または2に記載の両面粘着テープ。
- 前記発泡体基材が、密度0.45g/cm3以下、層間強度10N/cm以上の発泡体基材であり、前記粘着剤層(a1)及び前記粘着剤層(a2)のいずれか一方または両方が、厚さ25μmのポリエチレンテレフタレート基材に厚さ25μmの粘着剤層(a1)または前記粘着剤層(a2)を設けて形成した粘着テープを、温度23℃、相対湿度65%RHの環境下でアルミニウム板に対し、2kgローラーを使用して圧着回数一往復で圧着し、温度23℃、相対湿度50%RHの環境下に1時間静置した後の剥離速度300mm/minにおける180°引き剥がし接着力が10N/20mm以上の粘着剤層である請求項1〜3のいずれか1項に記載の両面粘着テープ。
- 前記樹脂フィルムが、ポリエステル樹脂を用いて得られるフィルムである請求項1〜4のいずれか1項に記載の両面粘着テープ。
- 前記接着剤層が、ウレタン樹脂と着色成分とを含有する層である請求項1〜5のいずれか1項に記載の両面粘着テープ。
- 電子機器を構成する2以上の部品の固定に使用する請求項1〜6のいずれか1項に記載の両面粘着テープ。
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