JPWO2013187404A1 - 保液シート及びフェイスマスク - Google Patents
保液シート及びフェイスマスク Download PDFInfo
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- JPWO2013187404A1 JPWO2013187404A1 JP2014521346A JP2014521346A JPWO2013187404A1 JP WO2013187404 A1 JPWO2013187404 A1 JP WO2013187404A1 JP 2014521346 A JP2014521346 A JP 2014521346A JP 2014521346 A JP2014521346 A JP 2014521346A JP WO2013187404 A1 JPWO2013187404 A1 JP WO2013187404A1
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Classifications
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- Y10T442/689—Hydroentangled nonwoven fabric
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
- Y10T442/696—Including strand or fiber material which is stated to have specific attributes [e.g., heat or fire resistance, chemical or solvent resistance, high absorption for aqueous compositions, water solubility, heat shrinkability, etc.]
Abstract
Description
前記透明繊維はカルボキシル基を実質的に含まないセルロース系繊維(特に、溶剤紡糸セルロース繊維などの再生セルロース繊維)を含んでいてもよい。前記透明繊維は、溶剤紡糸セルロース繊維に加えて、レーヨン繊維を含んでいてもよい。前記溶剤紡糸セルロース繊維の割合は、保液層全体に対して30質量%以上であってもよい。前記透明繊維は、酸化チタンなどの着色剤の含有量0.1質量%以下の透明繊維であってもよい。前記不織繊維集合体を形成する繊維が平均繊維径1〜15μmの短繊維であってもよい。短繊維の平均繊維長は20〜70mm程度であってもよい。前記不織繊維集合体の見掛密度は0.08〜0.15g/cm3であり、かつ空隙率は90〜95%であってもよい。前記不織繊維集合体は、セミランダムウェブ、パラレルウェブ又はクロスウェブを水流絡合させたスパンレース不織布であってもよい。前記不織布集合体の目付が30〜100g/m2程度であってもよい。
本発明の保液シートは、液状成分(特に水性液状成分)を吸収可能な保液層を含む。詳しくは、本発明において、保液層とは、美容成分又は薬効(効能)成分(例えば、保湿成分、クレンジング成分、制汗成分、香り成分、美白成分、血行促進成分、冷却成分、紫外線吸収成分、皮膚かゆみ抑制成分など)を含む液状成分(液状化合物)を含浸するのに必要な濡れ性と保液するための空隙を有し、使用時の取り扱いにおいても液だれすることなく、体の所定の部位(例えば顔)を覆うまで保持し、貼付又は静置すると共に液体化粧料を少しずつ肌側に移行させる役割を有している。本発明では、このような特性を有する保液層が不織繊維集合体で形成されている。
(式中、Aは、浸漬前の不織布の重量であり、Bは、水を垂らした後の不織布の重量である)。
保液層を構成する不織布又は不織繊維集合体は、慣用の方法、例えば、スパンレース法、ニードルパンチ法、スチームジェット法などにより製造できる。これらの方法のうち、価格面を重視する場合であれば、工業的に高速で生産が可能なスパンレース法を用いてもよい。また、嵩高にすることにより保液性能を高める場合には、サーマルボンド法やスチームジェット法(特に、厚み方向で均一な接着を実現でき、形態保持性と嵩高性とを高度に両立できる点から、スチームジェット法)などを用いてもよい。
本発明の保液シートは、前記保液層単独で形成されていてもよいが、保液層の一方の面に、透明樹脂で形成された非多孔性の透明層がさらに積層されていてもよい。前記非多孔性透明層は、皮膚と接触する側とは反対側に積層され、非多孔性であるため、保液層を皮膚に接触すると、保液層の液状成分が密封され、温度が上昇して毛穴が拡がるため、有効成分の吸収を促進できる。また、液状成分の乾燥も抑制でき、長時間に亘り、皮膚に対して有効成分を供給できる。
本発明の保液シートは、保液層の少なくとも一方の面に、メルトブローン不織布で形成された密着層がさらに積層されていてもよい。特に、保液シートの一方の面に前記非多孔性透明層が形成されている場合、密着層は他方の面に積層してもよく、非多孔性透明層と保液層との間に介在してもよい。
本発明の保液シートは、少なくとも前記保液層で形成されており、湿潤状態での透明性が高く、下記に示す透明度が0.27以下である。
前記透明度は0.01〜0.27程度であってもよく、例えば、0.02〜0.25、好ましくは0.03〜0.2、さらに好ましくは0.05〜0.15(特に0.06〜0.1)程度である。
JIS L1906に準じ、温度20℃、湿度65%の標準状態にサンプルを24時間放置後、幅方向1m×長さ方向1mの試料を採取し、天秤を用いて重量(g)を測定する。得られた重量(g)の小数点以下を四捨五入して目付とした。
剃刀(フェザー安全剃刀(株)製「フェザー剃刃S片刃」)を用いて、サンプルを面に垂直にMD方向に切断し、デジタル顕微鏡[(株)キーエンス(KEYENCE)製デジタルマイクロスコープ(DIGITAL MICROSCOPE) VHX−900]にて試料の断面を観察し厚さを計測した。
目付(g/m2)を厚みで除し見掛密度を求めた。
不織布の重量(g)、繊維比重(g/cm3)、不織布の見かけ体積(cm3)から、下式で算出した。なお、不織布の見かけ体積とは、不織布をシートとして見たときの面となる部分の面積に前記厚みの測定法で得られる値を高さとして乗して算出した。
[平均繊維径(μm)]
繊維シートから試験片(縦×横=5cm×5cm)を採取し、試験片の表面における中央部(対角線の交点を中心とする部分)を、走査型電子顕微鏡(SEM)を使用して1000倍の倍率で写真撮影した。得られた写真の中央部(対角線の交点)を中心として写真上に半径30cmの円を描き、その円内から無作為に100本の繊維を選定し、長さ方向の中央部又はそれに近い箇所での繊維径をノギスにより測定し、その平均値を採って平均繊維径(数平均繊維径)とした。なお、測定に当たっては、写真に撮影されている繊維が繊維シートの最表面に位置する繊維であるか、又は内側に位置する繊維であるかを区別せずに、SEM写真に写っている繊維のすべてを対象として平均繊維径を求めた。
白度及び透明度は、次の手順で測定した。
(1)測定試料を10×10cmに裁断し重量、厚みを測定する。
(2)黒色のアクリル板(メタクリル樹脂押出板、(株)クラレ製「コモグラス」、12.5cm×12.5cm、厚み3mm)の白度(WI値)を色差計(コニカミノルタ(株)製「色彩色差計CR−410」)で測定する。
(3)(2)の黒色のアクリル板の上に試料を載置し、白度(WI値)を色差計で測定する。
(4)試料にスプレーでイオン交換水を含浸させ、700%含水率になるまで水分調整を行う。
(5)試料をハンドローラー(幅4cm×重量280g、線圧70g/cm)で押さえ、試料と黒色のアクリル板との間に溜まった空気を抜き出すとともに、試料を黒色のアクリル板に密着させる。
(6)湿潤状態で黒色のアクリル板に密着した試料の白度(WI値)を色差計で測定する。
なお、シート質量に対して700質量%の水を含浸させたときの白度(%)は、黒色のアクリル板のWI値(W0)と、試料にイオン交換水を700質量%含浸させ、黒色のアクリル板に密着させたときのWI値(W1)との差(W1−W0)として求めることができる。W0は6.67であった。
JIS L1913(一般短繊維不織布)6.3.2(湿潤時の引張強さ及び伸び率試験)に記載の方法に準拠して測定した。具体的には、サンプルを20℃±2℃の水中に自重で沈降するまで置くか、又は1時間以上水中に沈めておいた後、浸漬液から取り出して、定速伸長形引張試験機((株)島津製作所製)を用いて、速やかに30%伸長時応力を不織布の幅(CD)方向について測定した。
(透明繊維)
テンセル bright:テンセル繊維、LENZING社製「TENCEL」、繊度1.7dtex(平均繊維径12μm)×平均繊維長38mm、酸化チタン含有量0.00質量%、目付50g/m2の不織布における保水率1183%
レーヨン bright:レーヨン繊維、ダイワボウレーヨン(株)製「コロナBH」、繊度1.7dtex(平均繊維径12μm)×平均繊維長44mm、酸化チタン含有量0.00質量%
ポリエステル bright:ポリエチレンテレフタレート(PET)繊維、繊度1.56dtex(平均繊維径11.4μm)×平均繊維長51mm、酸化チタン含有量0.09質量%
T型ポリエステル brightブライトT型PET:断面形状がT型のPET繊維、繊度2.2dtex(平均繊維径14μm)×平均繊維長51mm、酸化チタン含有量0.09質量%
ソフィスタ bright:芯部がポリエチレンテレフタレートで構成され、鞘部がエチレン−ビニルアルコール共重合体(EVOH)で構成された芯鞘複合繊維、クラレ(株)製「ソフィスタ」、平均繊維径2.2dtex(平均繊維径13.5μm)×平均繊維長51mm、芯部の酸化チタン含有量0.05質量%
(不透明繊維)
テンセル dull:テンセル繊維、LENZING社製「LENZING Lyocell」、繊度1.7dtex(平均繊維径12μm)×平均繊維長38mm、酸化チタン含有量0.75質量%
レーヨン dull:レーヨン繊維、繊度1.7dtex(平均繊維径12μm)×平均繊維長38mm、酸化チタン含有量0.60質量%
ポリエステル semi dull:PET繊維、繊度1.56dtex(平均繊維径11.4μm)×平均繊維長51mm、酸化チタン含有量0.50質量%
ソフィスタ semi dull:芯部がポリエチレンテレフタレートで構成され、鞘部がエチレン−ビニルアルコール共重合体(EVOH)で構成された芯鞘複合繊維、クラレ(株)製「ソフィスタ」、平均繊維径2.2dtex(平均繊維径13.5μm)×平均繊維長51mm、芯部の酸化チタン含有量0.50質量%
太繊度レーヨン dull:レーヨン繊維、繊度5.5dtex(平均繊維径21.3μm)×平均繊維長51mm、酸化チタン含有量0.60質量%。
PP−MB:MFR(230℃、2.16kg)=1100g/10分のポリプロピレン
Ny−MB:MFR(230℃、2.16kg)=45g/10分のポリアミド6
[非多孔性透明層のフィルム]
PEラミ:低密度ポリエチレンフィルム(ポリエチレン:東ソー(株)製「LDポリエチレン ペトロセン」)、厚み15μm
PETフィルム:PETフィルム(東レ(株)製「ルミラーPX52」)、厚み12μm。
テンセル(bright)繊維100質量部を均一に解繊した後、目付100g/m2のセミランダムカードウェブを常法により作製し、このカードウェッブを開口率25%、穴径0.3mmのパンチングドラム支持体上に載置して速度10m/分で長手方向に連続的に移送すると同時に、上方から高圧水流を噴射して交絡処理を行って、交絡した繊維ウェブ(不織布)を製造した。この交絡処理に当たっては、穴径0.10mmのオリフィスをウェブの幅方向に沿って0.6mmの間隔で設けてあるノズル2本を使用し(隣接するノズル間の距離20cm)、1列目のノズルから噴射した高圧水流の水圧を2.0MPa、2列目のノズルから噴射した高圧水流の水圧を3.0MPaとして行った。さらに細かい網目を有する全体に平坦な支持体に載置して連続的に移送すると共に高圧水流を噴射して交絡処理を行った。この交絡処理は、穴径0.10mmのオリフィスをウェブの幅方向に沿って0.6mmの間隔で設けてあるノズル2本を使用して、いずれも高圧水流の水圧4.0MPaの条件下で行った。さらに130℃で乾燥して、目付けが100g/m2のスパンレース不織布で形成された保液シートを得た。
表1に示す目付量に変更したセミランダムカードウェブを作製する以外は実施例1と同様にして保液シートを得た。
テンセル(bright)繊維を単独で用いる代わりに、テンセル(bright)繊維とレーヨン(bright)繊維とを表1に示す割合で均一に混綿したセミランダムカードウェブを作製する以外は実施例4と同様にして保液シートを得た。
テンセル(bright)繊維の代わりに、レーヨン(bright)繊維を用いたセミランダムカードウェブを作製する以外は実施例4と同様にして保液シートを得た。
テンセル(bright)繊維の代わりに、ソフィスタ(bright)繊維を用いたセミランダムカードウェブを作製する以外は実施例4と同様にして保液シートを得た。
テンセル(bright)繊維の代わりに、ポリエステル(bright)繊維を用いたセミランダムカードウェブを作製する以外は実施例4と同様にして保液シートを得た。
表2に示す目付量に変更したセミランダムカードウェブを作製する以外は実施例10と同様にして保液シートを得た。
表3に示す目付量に変更したセミランダムカードウェブを作製する以外は実施例8と同様にして保液シートを得た。
テンセル(bright)繊維100質量部の代わりに、テンセル(bright)繊維50質量部及びソフィスタ(bright)繊維50質量部を均一に混綿した後、目付50g/m2のセミランダムカードウェブを作製する以外は実施例1と同様にして保液シートを得た。
テンセル(bright)繊維100質量部の代わりに、テンセル(bright)繊維50質量部及びポリエステル(bright)繊維50質量部を均一に混綿した後、2回目の交絡処理における高圧水流の水圧を3.0MPaとし、目付70g/m2のセミランダムカードウェブを作製する以外は実施例1と同様にして保液シートを得た。
テンセル(bright)繊維100質量部の代わりに、テンセル(bright)繊維30質量部、ポリエステル(bright)繊維50質量部及びポリエステル(semi dull)繊維20質量部を均一に混綿した後、目付52g/m2のセミランダムカードウェブを作製する以外は実施例1と同様にして保液シートを得た。
テンセル(bright)繊維を単独で用いる代わりに、表3に示す割合でテンセル(bright)繊維とテンセル(dull)繊維とを均一に混綿したセミランダムカードウェブを作製する以外は実施例4と同様にして保液シートを得た。
ポリアミド樹脂(MFR=45g/10分)100質量部を用いて、一般的なメルトブローン製造設備を使用し、紡糸温度280℃、エアー温度280℃、エアー圧力0.4MPa、孔径0.3mmφ、単孔吐出量0.3g/孔・分、速度19m/分で口金における紡糸孔数400個(1列配置)にてメルトブローン紡糸を行い、回転するネットコンベアを支持体として捕集し、目付10g/m2のメルトブローン不織布シートを製造し、巻き取った。
目付を70g/m2に変更する以外は実施例1と同様にしてスパンレース不織布を製造した。Tダイ押出し成形機を用いて、ポリエチレンフィルムをスパンレース不織布の上に押出コーティングして保液シートを製造した。
ポリプロピレン樹脂(MFR=1100g/10分)100質量部を用いて、一般的なメルトブローン製造設備を使用し、紡糸温度260℃、エアー温度270℃、エアー圧力0.4MPa、孔径0.3mmφ、単孔吐出量0.2g/孔・分、口金における紡糸孔数400個(1列配置)にてメルトブローン紡糸を行い、速度50m/分で回転するネットコンベアを支持体として捕集し、目付5g/m2のメルトブローン不織布シートを製造し、巻き取った。
テンセル(bright)繊維の代わりに、テンセル(dull)繊維を用いて、目付91g/m2のセミランダムカードウェブを作製する以外は実施例1と同様にして保液シートを得た。
テンセル(bright)繊維の代わりに、レーヨン(dull)繊維を用いて、目付70g/m2のセミランダムカードウェブを作製する以外は実施例1と同様にして保液シートを得た。
テンセル(bright)繊維100質量部の代わりに、レーヨン(bright)繊維50質量部及びレーヨン(dull)繊維50質量部を均一に混綿した後、目付90g/m2のセミランダムカードウェブを作製する以外は実施例1と同様にして保液シートを得た。
テンセル(bright)繊維の代わりに、ポリエステル(semi dull)繊維を用いて、目付90g/m2のセミランダムカードウェブを作製する以外は実施例1と同様にして保液シートを得た。
テンセル(bright)繊維100質量部の代わりに、テンセル(dull)繊維30質量部、レーヨン(dull)繊維50質量部及びセミダルPET繊維20質量部を均一に混綿した後、目付70g/m2のセミランダムカードウェブを作製する以外は実施例1と同様にして保液シートを得た。
テンセル(bright)繊維の代わりに、太繊度レーヨン(dull)繊維を用いて、目付50g/m2のセミランダムカードウェブを作製する以外は実施例1と同様にして保液シートを得た。
テンセル(bright)繊維の代わりに、ソフィスタ(semi dull)繊維を用いて、目付70g/m2のセミランダムカードウェブを作製する以外は実施例1と同様にして保液シートを得た。
テンセル(bright)繊維の代わりに、テンセル(dull)繊維を用いて、目付30g/m2のセミランダムカードウェブを作製する以外は実施例1と同様にして保液シートを得た。
テンセル(bright)繊維の代わりに、ポリエステル(semi dull)繊維を用いて、目付30g/m2のセミランダムカードウェブを作製する以外は実施例1と同様にして保液シートを得た。
市販の綿不織布(旭化成せんい(株)製「ベンコットM−3II」、目付50g/m2の不織布における保水率843%)を用いた。
市販の綿不織布(旭化成せんい(株)製「ベンコットJクロス300」)を用いた。
目付を202g/m2に変更する以外は実施例1と同様にして保液シートを得た。
Claims (20)
- 液状成分を吸収可能な保液層を含み、かつ前記保液層が透明繊維を含む不織繊維集合体で形成されている保液シートであって、下記に示す透明度が0.27以下である保液シート。
透明度=シート質量に対して700質量%の水を含浸させたときの白度(%)/目付量(g/m2) - 透明繊維がカルボキシル基を実質的に含まないセルロース系繊維を含む請求項1記載の保液シート。
- 透明繊維が再生セルロース繊維を含む請求項1又は2記載の保液シート。
- 透明繊維が溶剤紡糸セルロース繊維を含む請求項1〜3のいずれかに記載の保液シート。
- 透明繊維がさらにレーヨン繊維を含む請求項4記載の保液シート。
- 溶剤紡糸セルロース繊維の割合が、保液層全体に対して30質量%以上である請求項1〜5のいずれかに記載の保液シート。
- 透明繊維が、着色剤の含有量0.1質量%以下の透明繊維である請求項1〜6のいずれかに記載の保液シート。
- 着色剤が酸化チタンである請求項7記載の保液シート。
- 不織繊維集合体を形成する繊維が平均繊維径1〜15μmの短繊維である請求項1〜8のいずれかに記載の保液シート。
- 短繊維の平均繊維長が20〜70mmであるとともに、不織繊維集合体の見掛密度が0.08〜0.15g/cm3であり、かつ空隙率が90〜95%である請求項9記載の保液シート。
- 不織繊維集合体が、セミランダムウェブ、パラレルウェブ又はクロスウェブを水流絡合させたスパンレース不織布である請求項1〜10のいずれかに記載の保液シート。
- 不織布集合体の目付が30〜100g/m2である請求項1から11のいずれかに記載の保液シート。
- 保液層の一方の面に、透明樹脂で形成された非多孔性の透明層が積層されている請求項1〜12のいずれかに記載の保液シート。
- 保液層の少なくとも一方の面に、メルトブローン不織布で形成された密着層が積層されている請求項1〜13のいずれかに記載の保液シート。
- メルトブローン不織布が、着色剤の含有量0.1質量%以下の透明繊維で形成されている請求項14記載の保液シート。
- JIS L1913に準拠した湿潤時の30%伸長時応力が、少なくとも一方向において1.5N/5cm以上である請求項1〜15のいずれかに記載の保液シート。
- シート質量に対して700質量%の水を含浸させたときの白度(%)が1〜10%である請求項1〜16のいずれかに記載の保液シート。
- 保液層に液状成分を含浸させた請求項1〜17のいずれかに記載の保液シート。
- 化粧料を含む液状成分を保液層に含浸させたスキンケアシートである請求項18記載の保液シート。
- フェイスマスクである請求項19記載の保液シート。
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