JP2018089966A - 多層ナノファイバシート及びその付着方法 - Google Patents
多層ナノファイバシート及びその付着方法 Download PDFInfo
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- JP2018089966A JP2018089966A JP2017228139A JP2017228139A JP2018089966A JP 2018089966 A JP2018089966 A JP 2018089966A JP 2017228139 A JP2017228139 A JP 2017228139A JP 2017228139 A JP2017228139 A JP 2017228139A JP 2018089966 A JP2018089966 A JP 2018089966A
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Abstract
Description
前記多層ナノファイバシートにおける前記多孔質層側の面を液状物で湿潤させた状態で、対象物の表面に当接させ、該表面に付着させる多層ナノファイバシートの付着方法を提供するものである。
対象物の表面を液状物で湿潤させた状態下に、前記多層ナノファイバシートにおける前記多孔質層側の面を該表面に当接させ、該表面に付着させる多層ナノファイバシートの付着方法を提供するものである。
前記多層ナノファイバシートにおける前記多孔質層側の面を液状物で湿潤させた状態で、対象物の表面に当接させて付着させて、然る後に、前記基材層を前記ナノファイバ層から剥離する多層ナノファイバシートの付着方法を提供するものである。
対象物の表面を液状物で湿潤させた状態下に、前記多層ナノファイバシートにおける前記多孔質層側の面を該表面に当接させて付着させて、然る後に、前記基材層を前記ナノファイバ層から剥離する多層ナノファイバシートの付着方法を提供するものである。
<1>
水溶性高分子化合物を含有するナノファイバを含むナノファイバ層と、該ナノファイバ層の一方の面側に配された基材層と、該ナノファイバ層の他方の面側に配された水不溶性の多孔質層とを有し、これら3層が積層されてなり、前記多孔質層側の面が対象物の表面に臨むように配されて使用される多層ナノファイバシート。
前記多孔質層はその厚さが3μm以上1000μm以下である前記<1>に記載の多層ナノファイバシート。
<3>
前記多孔質層が水不溶性ナノファイバを含む層である前記<1>又は<2>に記載の多層ナノファイバシート。
<4>
水によって前記水溶性高分子化合物が溶解し、前記多孔質層を介して対象物への密着性が発現する前記<1>ないし<3>のいずれか1に記載の多層ナノファイバシート。
<5>
前記ナノファイバ層に、1種又は2種以上のナノファイバを含有させ、
少なくとも1種類のナノファイバとして水溶性高分子化合物を含有するものを用い、前記ナノファイバ層は、その全体として水溶性を呈する前記<1>ないし<4>のいずれか1に記載の多層ナノファイバシート。
<6>
前記ナノファイバが水溶性高分子化合物を含有する場合には、該ナノファイバに他の成分を含有させることができ、
第1の成分を第1のナノファイバに含有させ、且つ第2の成分を第2のナノファイバに含有させ、第1の成分及び第2の成分として、酸成分と炭酸塩とを用いる、前記<1>ないし<5>のいずれか1に記載の多層ナノファイバシート。
前記基材層は水不溶性のものである前記<1>ないし<6>のいずれか1に記載の多層ナノファイバシート。
<8>
前記基材層は、フィルムや繊維集合体の形態であり、
前記基材層は通気性が低いものであることが望ましく、フィルムの形態であることが好ましい前記<1>ないし<7>のいずれか1に記載の多層ナノファイバシート。
<9>
前記基材層がフィルムの形態であり、
前記基材層は、その厚さは5μm以上であることが好ましく、10μm以上であることが更に好ましく、また、500μm以下であることが好ましく、300μm以下であることが更に好ましく、5μm以上500μm以下であることが好ましく、10μm以上300μm以下であることが更に好ましい前記<1>ないし<8>のいずれか1に記載の多層ナノファイバシート。
前記基材層が透明又は半透明のフィルムの形態である前記<1>ないし<9>のいずれか1に記載の多層ナノファイバシート。
<11>
前記多孔質層は多数の細孔を有する多孔性の層であり、
前記多孔質層が有する細孔はオープンセルの構造を有する前記<1>ないし<10>のいずれか1に記載の多層ナノファイバシート。
<12>
前記多孔質層が繊維集合体の層、又はオープンセルの構造を有する海綿状体の層である前記<1>ないし<11>のいずれか1に記載の多層ナノファイバシート。
<13>
前記多孔質層が繊維集合体の層からなり、
前記繊維集合体の層は、不織布又はメッシュシートであり、
前記不織布が、メルトブローン不織布、スパンボンド不織布、エアスルー不織布又はスパンレース不織布である前記<1>ないし<12>のいずれか1に記載の多層ナノファイバシート。
<14>
前記多孔質層が繊維集合体の層からなり、
前記繊維集合体を構成する繊維が水不溶性のナノファイバであり、
前記多孔質層が水不溶性高分子化合物から構成されている前記<1>ないし<13>のいずれか1に記載の多層ナノファイバシート。
前記水不溶性高分子化合物が、ポリオレフィン樹脂、ポリエチレンテレフタレート樹脂、ポリブチレンテレフタレート樹脂、ポリ乳酸(PLA)、ポリアクリロニトリル樹脂、ポリメタクリル酸樹脂等のアクリル樹脂、ポリスチレン樹脂、ポリビニルブチラール樹脂、ポリウレタン樹脂、ポリアミド樹脂、ポリイミド樹脂、又はポリアミドイミド樹脂であり、
前記水不溶性高分子化合物は単独で又は2種以上を組み合わせて用いることができる前記<1>ないし<14>のいずれか1に記載の多層ナノファイバシート。
<16>
前記多孔質層はその厚さが3μm以上であることが好ましく、5μm以上であることが更に好ましく、10μm以上であることが一層好ましく、また1000μm以下であることが好ましく、500μm以下であることが更に好ましく、450μm以下であることが一層好ましく、3μm以上1000μm以下であることが好ましく、5μm以上500μm以下であることが更に好ましく、10μm以上450μm以下であることが一層好ましい前記<1>ないし<15>のいずれか1に記載の多層ナノファイバシート。
<17>
前記3層が固着した状態で積層されてなる前記<1>ないし<16>のいずれか1に記載の多層ナノファイバシート。
<18>
前記多層ナノファイバシートを構成する前記の3層が固着した状態は、(a)多層ナノファイバシートの使用前、及び(b)多層ナノファイバシートが液状物で湿潤して、ナノファイバ層が溶解した後、のいずれの場合にも維持されている前記<17>に記載の多層ナノファイバシート。
<19>
前記(b)の場合には、基材層と多孔質層とが固着していることが好ましい前記<18>に記載の多層ナノファイバシート。
<20>
前記多層ナノファイバシートにおける3層の固着は、接着剤を用いた接着、圧着、超音波シールによる接合、レーザーによる融着、又はヒートシールによる熱溶着である前記<17>ないし<19>のいずれか1に記載の多層ナノファイバシート。
前記固着のパターンは、線状の固着のパターン、点状の固着のパターン、又は両者を組み合わせた固着パターンである前記<17>ないし<20>のいずれか1に記載の多層ナノファイバシート。
<22>
前記<1>ないし<21>のいずれか1に記載の多層ナノファイバシートを、対象物の表面に付着させる多層ナノファイバシートの付着方法であって、
前記多層ナノファイバシートにおける前記多孔質層側の面を液状物で湿潤させた状態で、対象物の表面に当接させ、該表面に付着させる多層ナノファイバシートの付着方法。
<23>
前記<1>ないし<21>のいずれか1に記載の多層ナノファイバシートを、対象物の表面に付着させる多層ナノファイバシートの付着方法であって、
対象物の表面を液状物で湿潤させた状態下に、前記多層ナノファイバシートにおける前記多孔質層側の面を該表面に当接させ、該表面に付着させる多層ナノファイバシートの付着方法。
前記<1>ないし<16>のいずれか1に記載の多層ナノファイバシートを、対象物の表面に付着させる多層ナノファイバシートの付着方法であって、
前記多層ナノファイバシートにおける前記多孔質層側の面を液状物で湿潤させた状態で、対象物の表面に当接させて付着させて、然る後に、前記基材層を前記ナノファイバ層から剥離する多層ナノファイバシートの付着方法。
<25>
前記<1>ないし<16>のいずれか1に記載の多層ナノファイバシートを、対象物の表面に付着させる多層ナノファイバシートの付着方法であって、
対象物の表面を液状物で湿潤させた状態下に、前記多層ナノファイバシートにおける前記多孔質層側の面を該表面に当接させて付着させて、然る後に、前記基材層を前記ナノファイバ層から剥離する多層ナノファイバシートの付着方法。
<26>
前記液状物として、水、水溶液、水分散液、O/Wエマルションの乳化液、又は増粘性多糖類の増粘剤で増粘された水性液を用いる前記<22>ないし<25>のいずれか1に記載の多層ナノファイバシートの付着方法。
図1に示す構造の多層ナノファイバシートを製造した。基材層として厚さ25μmのポリプロピレン(PP)フィルムを用いた。このPPフィルムの一面にプルランのナノファイバからなるナノファイバ層を形成した。ナノファイバの太さは600nmであり、ナノファイバ層の坪量は20g/m2であった。ナノファイバ層は、プルランを15%含み、水を85%含む水溶液を用いエレクトロスピニング法によって形成した。エレクトロスピニング法の実施条件は、電圧25kV、電極間距離200mm、吐出量1ml/hとした。次に、ナノファイバ層の表面に多孔質層を重ね合わせた。多孔質層としては、厚さ80μm、坪量12g/m2のポリプロピレンからなるスパンボンド不織布を用いた。このようにして3層が積層された積層体を超音波シールして各層間を固着させた。超音波シールの加工位置は、矩形の積層体の全面に対して、図2に示すパターンを用いて不連続に形成した。同図中の単位はmmである。このようにして、目的とする多層ナノファイバシート10を得た。
多孔質層として以下の表1に示す不織布を用いた。また、固着方法として同表に示す方法を用いた。これら以外は実施例1と同様にして多層ナノファイバシートを得た。
実施例2においては、多孔質層として、厚さ115μm、坪量17g/m2のポリプロピレンからなるスパンボンド不織布を用いた。実施例3においては、多孔質層として、厚さ926μm、坪量25g/m2、芯がポリエチレンテレフタレートと鞘がポリエチレンからなる芯鞘複合繊維(2.0dtex)と、芯がポリプロピレンと鞘がポリエチレンからなる芯鞘複合繊維(5.6dtex)とを50:50で混綿したエアスルー不織布を用いた。実施例4においては、多孔質層として、厚さ1660μm、坪量25g/m2、芯がポリエチレンテレフタレートで鞘がポリエチレンからなる芯鞘複合繊維(2.0dtex)からなるエアスルー不織布を用いた。また、固着方法としての圧着は、多孔質層とナノファイバ層と基材層の3層を針なしステープラー(ハリナックス(商標登録)、コクヨ株式会社製)で挟み込み、3層を圧着することで固着した。圧着位置は、矩形の積層体の外周を一周することで施した。
多孔質層としてメッシュシート(商品名「ティーロードシャープ5800F」、山中産業株式会社製)を用いた。また、固着方法として接着剤を用いた。接着剤はスプレー(商品名「スプレーのり55」、住友スリーエム株式会社製)によって、矩形の積層体の全面に連続的に施した。これら以外は実施例1と同様にして多層ナノファイバシートを得た。
多孔質層として、ポリビニルブチラール(エスレック(商標登録)BM−1、積水化学工業株式会社製)のナノファイバ層を用いた。ナノファイバ層は、ポリビニルブチラールを13%含み、エタノールを87%含む溶解溶液を用いエレクトロスピニング法によって形成した。エレクトロスピニング法の実施条件は、電圧30kV、電極間距離200mm、吐出量1ml/hとした。ナノファイバの太さは450nmであった。多孔質層の厚さは、表1に示すとおりとした。また、固着方法として圧着を用いた。固着は、実施例2ないし4と同様にして行った。更に、基材層として厚さ20μmのポリプロピレンフィルムを用いた。これら以外は実施例1と同様にして多層ナノファイバシートを得た。
基材層として厚さ30μmのキュプラ長繊維不織布を用いたほかは、実施例6と同様にして多層ナノファイバシートを得た。多孔質層及びナノファイバ層の厚さは、表1に示すとおりとした。
多層ナノファイバシート10におけるナノファイバ層11に、第1の成分としてクエン酸5.1%を含有し、第2の成分として炭酸水素ナトリウム4.2%を含有させ、二酸化炭素を発生し得る態様とした。各層の固着は行わなかった。基材層及び多孔質層の構成は、実施例8と同様にして多層ナノファイバシートを得た。
本比較例では、実施例1において、基材層及び多孔質層を形成しなかった。したがって本比較例のナノファイバシートは、ナノファイバ層のみからなるものであった。
本比較例では、実施例1において多孔質層を形成しなかった。したがって本比較例のナノファイバシートは、ナノファイバ層と基材層のみからなるものであった。静電紡糸法により、基材層である厚さ60μmのポリプロピレンフィルムに向けて、直接ナノファイバを紡糸して積層することで、ナノファイバシートを形成した。よって、後からナノファイバ層と基材層とを固着処理せず、静電力のみで積層させた。
実施例及び比較例で得られたナノファイバシートについて、ハンドリング性、ナノファイバシート剥離後の残液量と使用感、及び剥離強度を、以下の方法で評価・測定した。それらの結果を以下の表1に示す。
30歳から45歳までの男女3名のパネラーにナノファイバシートを指で摘まませて、ハンドリング性を評価させた。評価は以下の基準で行った。
3:シートのあらゆる部分を摘まんでもプルランナノファイバが溶けることなく、指に全く付着しない。
2:指で摘まんだ部分のプルランナノファイバが、指の湿気でやや膨潤し、シート形状が僅かに変形する。
1:指で摘まんだ部分のプルランナノファイバが溶けて指に付着する。
30歳から45歳までの男女3名のパネラー(A,B,C)にナノファイバシート剥離後の使用感と残液量の関係を評価させた。20mm×40mmの矩形に切り出したナノファイバシートにおける多孔質層側の面に市販の化粧水A(組成を表2に示す)を0.2g施し、多孔質層側が肌に当たるように頬に付着させた。3分経過後にナノファイバシートを頬から剥離させ、肌のべたつきや保湿感の観点から使用感を評価させた。肌上での残液量が多すぎると、肌にべたつきが強く残ることで使用感が悪くなるが、残液量が少なすぎても、保湿感が得られず使用感は悪くなる。更に残液量が極端に少ないと、有効成分が肌に供給されにくくなる点からも好ましくない。よって、評価は以下の基準で行った。結果を表1に示す。
3:程よい保湿感でべたつきも少ない。
2:やや保湿感が足りないか、又はややべたつきがある。
1:保湿感ないか、又はべたつきが強い。
パネラー3名の合計点数を算出し、以下の基準で評価した。
合計点数が9点:5
合計点数が8点又は7点:4
合計点数が6点又は5点:3
合計点数が4点:2
合計点数が3点:1
実際に肌側に転写する残液量を測定するため、次の測定を行った。20mm×40mmの矩形に切り出したナノファイバシートにおける多孔質層側の面に市販の化粧水A(組成を表2に示す)を施した(ただし比較例1及び2を除く)。比較例1については、質量既知の合成樹脂製の板の表面に化粧水を同様に0.2g供給し、ナノファイバシートを化粧水で湿らせた合成樹脂製の板の上に付着させた。比較例2については、PPフィルムからなる基材層の表面に化粧水を施した。化粧水はポンプを用いて0.2g供給した。このナノファイバシートにおける多孔質層側の面を、質量既知の合成樹脂製の板に付着させた。3分経過後にナノファイバシートを板から剥離させ、板の質量を測定した。測定された質量から板のみの質量を差し引いた値を残液量とした。0.2gの化粧水と、20mm×40mmの矩形プルランナノファイバ0.016gの合計質量0.216g(比較例1のナノファイバシートと化粧水の総質量)に対する残液量の割合に基づき、残液量の割合(%)を算出した。
幅15mm×長さ100mmの矩形に切り出したナノファイバシートにおける基材層側の面を、幅15mm×長さ100mmの両面テープ(商品名「ナイスタック」,ニチバン(株)製)を用いて水平な台の上に貼り付けて固定した。基材層の長さは30mmあれば測定可能である。
剥離強度の測定装置として180°剥離試験器(PEELING TESTER 型式IPT200−5N 測定範囲0.001〜5.0N;株式会社イマダ製)を用いた。ナノファイバシートにおける多孔質層の端部1mm〜2mmを、剥離試験器のロードセルに取り付けられたクリップでしっかりと固定した状態で、剥離角度(ナノファイバシートと粘着テープとのなす角度)が165〜180°になるようにして1,000mm/minの速度で引き剥がした。このときのロードセルの値(基材層と多孔質層との間剥離強度)を剥離強度とした。剥離強度の値が大きいほど機械強度に優れるとされる。剥離強度の値に基づき、以下の基準で評価した。
5:剥離強度が0.5N以上である。
4:剥離強度が0.1N以上0.5N未満である。
3:剥離強度が0.05N以上0.1N未満である。
2:剥離強度が0.01N以上0.05N未満である。
1:剥離強度が0.01N未満である。
11 ナノファイバ層
12 基材層
13 多孔質層
Claims (13)
- 水溶性高分子化合物を含有するナノファイバを含むナノファイバ層と、該ナノファイバ層の一方の面側に配された基材層と、該ナノファイバ層の他方の面側に配された水不溶性の多孔質層とを有し、
これら3層が積層されてなり、前記多孔質層側の面が対象物の表面に臨むように配されて使用される多層ナノファイバシート。 - 前記多孔質層はその厚さが3μm以上1000μm以下である請求項1に記載の多層ナノファイバシート。
- 前記多孔質層が水不溶性ナノファイバを含む層である請求項1又は2に記載の多層ナノファイバシート。
- 水によって前記水溶性高分子化合物が溶解し、前記多孔質層を介して対象物への密着性が発現する請求項1ないし3のいずれか一項に記載の多層ナノファイバシート。
- 前記基材層はフィルム又は繊維集合体の形態である請求項1ないし4のいずれか一項に記載の多層ナノファイバシート。
- 前記基材層が透明又は半透明のフィルムの形態である請求項5に記載の多層ナノファイバシート。
- 前記3層が固着した状態で積層されてなる請求項1ないし6のいずれか一項に記載の多層ナノファイバシート。
- 前記多層ナノファイバシートを構成する前記3層が固着した状態は、(a)多層ナノファイバシートの使用前、及び(b)多層ナノファイバシートが液状物で湿潤して、ナノファイバ層が溶解した後、のいずれの場合にも維持されている請求項7に記載の多層ナノファイバシート。
- 前記(b)の場合には、基材層と多孔質層とが固着している請求項8に記載の多層ナノファイバシート。
- 請求項1ないし9のいずれか一項に記載の多層ナノファイバシートを、対象物の表面に付着させる多層ナノファイバシートの付着方法であって、
前記多層ナノファイバシートにおける前記多孔質層側の面を液状物で湿潤させた状態で、対象物の表面に当接させ、該表面に付着させる多層ナノファイバシートの付着方法。 - 請求項1ないし9のいずれか一項に記載の多層ナノファイバシートを、対象物の表面に付着させる多層ナノファイバシートの付着方法であって、
対象物の表面を液状物で湿潤させた状態下に、前記多層ナノファイバシートにおける前記多孔質層側の面を該表面に当接させ、該表面に付着させる多層ナノファイバシートの付着方法。 - 請求項1ないし6のいずれか一項に記載の多層ナノファイバシートを、対象物の表面に付着させる多層ナノファイバシートの付着方法であって、
前記多層ナノファイバシートにおける前記多孔質層側の面を液状物で湿潤させた状態で、対象物の表面に当接させて付着させて、然る後に、前記基材層を前記ナノファイバ層から剥離する多層ナノファイバシートの付着方法。 - 請求項1ないし6のいずれか一項に記載の多層ナノファイバシートを、対象物の表面に付着させる多層ナノファイバシートの付着方法であって、
対象物の表面を液状物で湿潤させた状態下に、前記多層ナノファイバシートにおける前記多孔質層側の面を該表面に当接させて付着させて、然る後に、前記基材層を前記ナノファイバ層から剥離する多層ナノファイバシートの付着方法。
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CN112829419A (zh) | 2021-05-25 |
US20190282460A1 (en) | 2019-09-19 |
JP6343088B2 (ja) | 2018-06-13 |
US11229583B2 (en) | 2022-01-25 |
WO2018101336A1 (ja) | 2018-06-07 |
EP3549758A4 (en) | 2020-07-01 |
EP3549758B1 (en) | 2021-03-17 |
EP3549758A1 (en) | 2019-10-09 |
CN109982837A (zh) | 2019-07-05 |
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