JPWO2018062029A1 - ゲルシート - Google Patents
ゲルシート Download PDFInfo
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- JPWO2018062029A1 JPWO2018062029A1 JP2018542515A JP2018542515A JPWO2018062029A1 JP WO2018062029 A1 JPWO2018062029 A1 JP WO2018062029A1 JP 2018542515 A JP2018542515 A JP 2018542515A JP 2018542515 A JP2018542515 A JP 2018542515A JP WO2018062029 A1 JPWO2018062029 A1 JP WO2018062029A1
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- Prior art date
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Abstract
Description
(1)A層とB層との積層構造を有するゲルシートであって、前記A層の23℃、10Hzにおける貯蔵弾性率が12000〜40000Paであり、前記B層の23℃、10Hzにおける貯蔵弾性率が2000〜10000Paである前記ゲルシート。
(2)前記A層のベークライト板に対する粘着力が、0.1〜2.0N/20mmであり、前記B層のベークライト板に対する粘着力が、2.5〜15N/20mmである前記(1)に記載のゲルシート。
(3)厚みが0.2mm〜2.0mmである前記(1)又は(2)に記載のゲルシート。
(4)前記A層と前記B層の厚み比率が、A/B=0.25〜3.5である前記(1)〜(3)のいずれか一つに記載のゲルシート。
(5)前記A層及び前記B層が、高分子マトリックス、水及び多価アルコールを含むハイドロゲルであり、前記高分子マトリックスが、(メタ)アクリルアミド系単量体及び(メタ)アクリル酸エステルから選択される一種以上の単官能単量体と、架橋性単量体との共重合体である前記(1)〜(4)のいずれか一つに記載のゲルシート。
(6)前記A層に、さらにポリビニルアルコールが含まれる前記(5)に記載のゲルシート。
(7)前記A層及び前記B層の10Hzにおける交流インピーダンスが、ともに1000Ω以下である前記(1)〜(6)のいずれか一つに記載のゲルシート。
(8)前記A層の表面を皮膚に貼り付けて用いる皮膚貼着用ゲルシートである前記(1)〜(7)のいずれか一つに記載のゲルシート。
・A層の組成
A層全量に対して、単官能単量体としてアクリルアミドを24重量%、架橋性単量体としてN,N’−メチレンビスアクリルアミドを0.036重量%、塩化ナトリウム5重量%、グリセリン40.9重量%を計量し、この混合液に、ポリビニルアルコール(ケン化度88%)3重量%と、光重合開始剤として2−ヒドロキシ−2−メチル−1−フェニル−プロパン−1−オン(商品名:イルガキュアIR1173)0.1重量%と、さらにpH緩衝剤としてクエン酸3Na、クエン酸をそれぞれ1重量%加え、最後にイオン交換水を加えて全体を100重量%とし、A層のモノマー配合液を得た。
B層全量に対して、単官能単量体としてアクリルアミドを20重量%、架橋性単量体としてN,N’−メチレンビスアクリルアミドを0.032重量%、塩化ナトリウム5重量%、グリセリン44.9重量%を計量し、この混合液に、光重合開始剤として2−ヒドロキシ−2−メチル−1−フェニル−プロパン−1−オン(商品名:イルガキュアIR1173)0.1重量%と、さらにpH緩衝剤としてクエン酸3Na、クエン酸をそれぞれ1重量%加え、最後にイオン交換水を加えて全体を100重量%とし、B層のモノマー配合液を得た。
得られたB層のモノマー配合液を、シリコーンコーティングされたPETフィルム上に滴下し、一定のクリアランスを通過させることで、液が均一に押し広げられ、厚さが0.6mmになるように固定した。これにメタルハライドランプを使用してエネルギー量500mJ/cm2で紫外線照射を行うことにより厚さ0.6mmのB層を得た。得られたB層の上に、A層のモノマー配合液を滴下し、その上から同じくシリコーンコーティングされたPETフィルムを被せて、液を均一に押し広げ、厚さが0.3mmになるように固定した。これにメタルハライドランプを使用してエネルギー量3000mJ/cm2(B層に対しては合計3500mJ/cm2)の赤外線照射を行い、全厚み0.9mmのゲルシートを得た。なお、ゲルシートの厚みは、両面に貼着しているPETフィルムを剥がし、マイクロメーターで測定した。
A層及びB層の厚みをそれぞれ0.6mm、0.3mmとした以外は、上記実施例1と同様にしてゲルシートを作製した。
A層におけるポリビニルアルコールの含有量を2重量%とし、グリセリンの含有量を41.9重量%とした以外は、上記実施例2と同様にしてゲルシートを作製した。
上記実施例1において、B層のモノマー配合液を下記のように変更した。
A層及びB層の厚みをそれぞれ0.6mm、0.3mmとした以外は、上記実施例4と同様にしてゲルシートを作製した。
ゲルシートの製造工程において、中間基材となるナイロンメッシュをA層とB層の間に埋め込んだ以外は、上記実施例5と同様にしてゲルシートを作製した。
ゲルシートの製造工程において、中間基材となるナイロンメッシュをA層とB層の間に埋め込んだ以外は、上記実施例2と同様にしてゲルシートを作製した。
上記実施例7のB層のモノマー配合液において、タッキファイヤーとしてポリアクリル酸Na(固形分20重量%水溶液、商品名「ジュリマーAC−20H」、東亜合成社製)を5重量%追加で溶解し、単官能単量体としてのアクリルアミドの含有量を19重量%とし、水の含有量を24重量%とした以外は、上記実施例7と同様にしてゲルシートを作製した。
上記実施例8のA層及びB層のモノマー配合液の組成を表2に示すように変更し、中間基材を埋め込まない以外は、上記実施例8と同様にしてゲルシートを作製した。
A層及びB層のモノマー配合液の組成を表2に示すように変更した以外は、上記実施例8と同様にしてゲルシートを作製した。
積層構造とせず、実施例1におけるポリビニルアルコールを含まないB層単体(厚み0.9mm)からゲルシートを構成した。
A層において、ポリビニルアルコールを含有せず、単官能単量体としてのアクリルアミドの含有量を20重量%に減らし、架橋性単量体としてのN,N’−メチレンビスアクリルアミドの含有量を0.5重量%に増やし、水の含有量を28重量%に、グリセリンの含有量を44.4重量%とした以外は、上記実施例2と同様にしてゲルシートを作製した。
A層として厚み2mmの導電性ゴム(エクシール社製、半導電ゲル(アスターC硬度15)、ウレタン樹脂製)を採用した以外は、上記実施例2と同様にしてゲルシートを作製した。
積層構造とせず、実施例1におけるA層単体(厚み0.9mm)からゲルシートを構成した。
実施例1〜10及び比較例1〜4で得られたゲルシートについて、各種試験を行った。
JIS Z0237:2009に準拠し、ゲルシートを120mm×20mmに切り出し、PETフィルムを剥がして現れたゲル面(A層又はB層)にベークライト板を貼り付けて、2kgの圧着ローラーを1往復して圧着させ、試験片とした。測定にはレオメーター(サン科学社製、CR−500DX)を用い、測定条件は、角度90度、速度300mm/分で行った。測定開始点から所定の引き剥がし時点(30、40、50、60、70mm)における応力値(N/20mm)を測定し、3試験(計15点)の値の平均値を粘着力とした。測定環境としては、温度23±5℃、湿度55%±10%の環境下で実施した。測定結果を表3及び表4に示す。
ゲルシートを40mm角に切り出し、A層の表面を頭皮に1分間押し当て、その後、ゲルシートを手で剥離し、髪の毛のまとわりつき具合を評価した。痛みを感じないときは○、痛みはないが髪の毛にゲルが付着する場合や髪の毛が引っ張られる場合を△、髪の毛が抜ける場合を×とした。測定環境としては、温度23±5℃、湿度55%±10%の環境下で実施した。評価結果を表3及び表4に示す。
ゲルシートのA層及びB層のそれぞれの貯蔵弾性率、損失弾性率、及び損失正接(tanθ)を測定した。具体的には、粘弾性測定装置(アントンパール社製、MR−102)を用い、23℃、10Hzの周波数における歪量1%の粘弾性測定を行った。治具は25φのSUS製パラレルプレートに25φのゲル片を貼り合わせ、1Nになる荷重点まで押し当てた後、10Hzにて貯蔵弾性率及び損失弾性率を測定し、その値から損失正接(tanθ)を算出した。測定結果を表3及び表4に示す。貯蔵弾性率が高いほど、弾性を示すため硬さの指標となる。
テンシロン万能試験機(オリエンテック社製、RTE−1210)により、温度23±5℃、湿度55±10%、試験速度0.1mm/分の条件にて、SUS製の12φの円柱を押し当て、ゲルシートのヤング率を測定した。前述の条件で2.98NになるまでのS−Sカーブを測定した。ゲルシートの試験片は25mm×40mmとし、円柱12φに対して十分な面積を確保した。
ヤング率=2点間の応力値の差/断面積×(ゲルシート厚み−2.0Nのときの時間×時間当たりの変位量)/歪量(2.0Nから2.5Nになるまでの変形量)
JIS K 7312に従い、ゲルシートのA層及びB層の表面のアスカーC強度を測定した。測定結果を表3及び表4に示す。表3及び表4に示すように、A層の表面のアスカーC硬度は9〜42であり、測定時に押し当てる凸部によって表面がへこんだが、復元した。また、B層の表面のアスカーC硬度は0であり、押し当てる凸部によって表面に傷が発生した。
テンシロン万能試験機(オリエンテック社製、RTE−1210)により、温度23±5℃、湿度55±10%、試験速度0.1mm/分の条件にて、SUS製の12φの円柱を押し当て、40Nになるまでの変位を加えた後、40Nになった時点で変位を固定し、40秒間キープした。そのときの応力緩和値を測定した。得られた値を40Nで割り返して、かけられた応力に対してどれくらい応力値が減少したかを割合で示す。
まず、ゲルシートをA層及びB層に分離させた。次に、A層及びB層のそれぞれを20mm角に切り出し、得られたA層同士あるいはB層同士を重ね合わせて試験片とした。それらの試験片をSUS板で挟み込み、ストレージオシロスコープ(入力電圧10V、10Hz、抵抗1MΩ)の条件により、A層及びB層のそれぞれの交流インピーダンス(Ω)を測定した。測定結果を表3及び表4に示す。
10 A層
20 B層
A層として厚み2mmの導電性ゴム(エクシール社製、半導電ゲル(アスカーC硬度15)、ウレタン樹脂製)を採用した以外は、上記実施例2と同様にしてゲルシートを作製した。
JIS K 7312に従い、ゲルシートのA層及びB層の表面のアスカーC硬度を測定した。測定結果を表3及び表4に示す。表3及び表4に示すように、A層の表面のアスカーC硬度は9〜42であり、測定時に押し当てる凸部によって表面がへこんだが、復元した。また、B層の表面のアスカーC硬度は0であり、押し当てる凸部によって表面に傷が発生した。
Claims (8)
- A層とB層との積層構造を有するゲルシートであって、前記A層の23℃、10Hzにおける貯蔵弾性率が12000〜40000Paであり、前記B層の23℃、10Hzにおける貯蔵弾性率が2000〜10000Paである前記ゲルシート。
- 前記A層のベークライト板に対する粘着力が、0.1〜2.0N/20mmであり、前記B層のベークライト板に対する粘着力が、2.5〜15N/20mmである請求項1に記載のゲルシート。
- 厚みが0.2mm〜2.0mmである請求項1又は2に記載のゲルシート。
- 前記A層と前記B層の厚み比率が、A/B=0.25〜3.5である請求項1〜3のいずれか1項に記載のゲルシート。
- 前記A層及び前記B層が、高分子マトリックス、水及び多価アルコールを含むハイドロゲルであり、前記高分子マトリックスが、(メタ)アクリルアミド系単量体及び(メタ)アクリル酸エステルから選択される一種以上の単官能単量体と、架橋性単量体との共重合体である請求項1〜4のいずれか1項に記載のゲルシート。
- 前記A層に、さらにポリビニルアルコールが含まれる請求項5に記載のゲルシート。
- 前記A層及び前記B層の10Hzにおける交流インピーダンスが、ともに1000Ω以下である請求項1〜6のいずれか1項に記載のゲルシート。
- 前記A層の表面を皮膚に貼り付けて用いる皮膚貼着用ゲルシートである請求項1〜7のいずれか1項に記載のゲルシート。
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