JP2014079324A - 吸収性物品 - Google Patents
吸収性物品 Download PDFInfo
- Publication number
- JP2014079324A JP2014079324A JP2012228234A JP2012228234A JP2014079324A JP 2014079324 A JP2014079324 A JP 2014079324A JP 2012228234 A JP2012228234 A JP 2012228234A JP 2012228234 A JP2012228234 A JP 2012228234A JP 2014079324 A JP2014079324 A JP 2014079324A
- Authority
- JP
- Japan
- Prior art keywords
- water
- mass
- resin powder
- absorption
- absorbent
- 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
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Images
Classifications
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Abstract
【解決手段】吸収性物品は、下記(a)〜(d)の要件を満足する吸水性樹脂粉末が配置された吸水層と、前記吸水層の下層に配置され、セルロースアセテート繊維を含む拡散層とを有する。
(a)嵩密度:0.45g/ml〜0.62g/ml
(b)ボルテックス法による吸収速度:20秒〜50秒
(c)荷重下通液速度:10秒以下
(d)吸湿ブロッキング率:5%以下
【選択図】図2
Description
(1−Xcosθa)<0
〔式中、θaは、繊維と同じ材料から作られ、若しあれば、同じ表面処理を有する平面フィルム上で測定した水の前進接触角であり、Xは、下記式:
X=Pw/{4r+(π−2)D}
(式中、Pwは、繊維の濡れ周長であり、そしてrは、繊維断面を取り囲む外接円の半径であり、そしてDは、繊維断面をわたす短軸寸法である)を満足する繊維断面の形状係数である〕
(a)嵩密度:0.45g/ml〜0.62g/ml
(b)ボルテックス法による吸収速度:20秒〜50秒
(c)荷重下通液速度:10秒以下
(d)吸湿ブロッキング率:5%以下
(a)嵩密度:0.45g/ml〜0.62g/ml
(b)ボルテックス法による吸収速度:20秒〜50秒
(c)荷重下通液速度:10秒以下
(d)吸湿ブロッキング率:5%以下
前記吸水層には、体液を吸収するための吸水性樹脂粉末が配置されている。以下、本発明で使用する吸水性樹脂粉末について説明する。前記吸水性樹脂粉末は、(a)嵩密度が0.45g/ml〜0.62g/mlである。前記吸水性樹脂粉末の嵩密度は、0.50g/ml以上であることが好ましく、0.52g/ml以上であることがより好ましく、0.61g/ml以下であることが好ましく、0.60g/ml以下であることがより好ましい。前記嵩密度は、吸水性樹脂粉末の形状の指標となる。嵩密度が前記範囲内であれば、吸水性樹脂粉末の間に体液の通路としての空隙ができやすくなる。その結果、吸収速度、繰り返し吸収速度が良好になる。嵩密度の測定方法については、後述する。
スチレン、α−メチルスチレン、ビニルトルエン及びヒドロキシスチレン等のスチレン、並びにビニルナフタレン及びジクロルスチレン等のスチレンのハロゲン置換体等。
(ii)炭素数2〜20の脂肪族エチレンモノマー;
エチレン、プロピレン、ブテン、イソブチレン、ペンテン、ヘプテン、ジイソブチレン、オクテン、ドデセンおよびオクタデセンなどのアルケン;並びに、ブタジエンおよびイソプレンなどのアルカジエン。
(iii)炭素数5〜15の脂環式エチレンモノマー;
ピネン、リモネン及びインデンなどのモノエチレン性不飽和モノマー;並びに、シクロペンタジエン、ビシクロペンタジエン及びエチリデンノルボルネンなどのポリエチレン性ビニル重合性モノマー。
・信越化学工業株式会社製
KF−945{側鎖、オキシエチレン及びオキシプロピレン}、KF−6020{側鎖、オキシエチレン及びオキシプロピレン}、X−22−6191{側鎖、オキシエチレン及びオキシプロピレン}、X−22−4952{側鎖、オキシエチレン及びオキシプロピレン}、X−22−4272{側鎖、オキシエチレン及びオキシプロピレン}、X−22−6266{側鎖、オキシエチレン及びオキシプロピレン}
FZ−2110{両末端、オキシエチレン及びオキシプロピレン}、FZ−2122{両末端、オキシエチレン及びオキシプロピレン}、FZ−7006{両末端、オキシエチレン及びオキシプロピレン}、FZ−2166{両末端、オキシエチレン及びオキシプロピレン}、FZ−2164{両末端、オキシエチレン及びオキシプロピレン}、FZ−2154{両末端、オキシエチレン及びオキシプロピレン}、FZ−2203{両末端、オキシエチレン及びオキシプロピレン}及びFZ−2207{両末端、オキシエチレン及びオキシプロピレン}
・信越化学工業株式会社製
X−22−3701E{側鎖、4000}、X−22−162C{両末端、2300}、X−22−3710{片末端、1450}
BY16−880{側鎖、3500}、BY16−750{両末端、750}、BY16−840{側鎖、3500}、SF8418{側鎖、3500}
・信越化学工業株式会社製
X−22−343{側鎖、525}、KF−101{側鎖、350}、KF−1001{側鎖、3500}、X−22−2000{側鎖、620}、X−22−2046{側鎖、600}、KF−102{側鎖、3600}、X−22−4741{側鎖、2500}、KF−1002{側鎖、4300}、X−22−3000T{側鎖、250}、X−22−163{両末端、200}、KF−105{両末端、490}、X−22−163A{両末端、1000}、X−22−163B{両末端、1750}、X−22−163C{両末端、2700}、X−22−169AS{両末端、500}、X−22−169B{両末端、1700}、X−22−173DX{片末端、4500}、X−22−9002{側鎖・両末端、5000}
FZ−3720{側鎖、1200}、BY16−839{側鎖、3700}、SF8411{側鎖、3200}、SF8413{側鎖、3800}、SF8421{側鎖、11000}、BY16−876{側鎖、2800}、FZ−3736{側鎖、5000}、BY16−855D{側鎖、180}、BY16−8{側鎖、3700}
・信越化学工業株式会社製
KF−865{側鎖、5000}、KF−864{側鎖、3800}、KF−859{側鎖、6000}、KF−393{側鎖、350}、KF−860{側鎖、7600}、KF−880{側鎖、1800}、KF−8004{側鎖、1500}、KF−8002{側鎖、1700}、KF−8005{側鎖、11000}、KF−867{側鎖、1700}、X−22−3820W{側鎖、55000}、KF−869{側鎖、8800}、KF−861{側鎖、2000}、X−22−3939A{側鎖、1500}、KF−877{側鎖、5200}、PAM−E{両末端、130}、KF−8010{両末端、430}、X−22−161A{両末端、800}、X−22−161B{両末端、1500}、KF−8012{両末端、2200}、KF−8008{両末端、5700}、X−22−1660B−3{両末端、2200}、KF−857{側鎖、2200}、KF−8001{側鎖、1900}、KF−862{側鎖、1900}、X−22−9192{側鎖、6500}
FZ−3707{側鎖、1500}、FZ−3504{側鎖、1000}、BY16−205{側鎖、4000}、FZ−3760{側鎖、1500}、FZ−3705{側鎖、4000}、BY16−209{側鎖、1800}、FZ−3710{側鎖、1800}、SF8417{側鎖、1800}、BY16−849{側鎖、600}、BY16−850{側鎖、3300}、BY16−879B{側鎖、8000}、BY16−892{側鎖、2000}、FZ−3501{側鎖、3000}、FZ−3785{側鎖、6000}、BY16−872{側鎖、1800}、BY16−213{側鎖、2700}、BY16−203{側鎖、1900}、BY16−898{側鎖、2900}、BY16−890{側鎖、1900}、BY16−893{側鎖、4000}、FZ−3789{側鎖、1900}、BY16−871{両末端、130}、BY16−853C{両末端、360}、BY16−853U{両末端、450}
質量比率(質量%)=100×吸水性樹脂粉末の目付け(g/m2)/{吸水性樹脂粉末の目付け(g/m2)+短繊維の目付け(g/m2)}
質量比率(質量%)=100×吸水性樹脂粉末の目付け(g/m2)/吸収体の目付け(g/m2)
本発明の吸収性物品は、前記吸水層の下層に配置された拡散層を有している。前記拡散層は、セルロースアセテート繊維を含んでいる。セルロースアセテート繊維は、セルロース骨格を有しており、体液との親和性が高いため、体液の取り込み速度、拡散速度が早い。また、セルロース骨格が有する水酸基がアセチル化されており、実質的に吸水性を有さず、体液との親和性が高すぎない。そのため、セルロースアセテート繊維により拡散された体液は、最終的に吸水層中の吸水性樹脂粉末に吸収されやすい。よって、拡散層中の液残りが低減され、肌面への液戻りが抑制されるため、体液を吸収した後のドライ性が良好となる。
次に、本発明の吸収性物品の具体的な適用例について説明する。本発明の吸収性物品としては、例えば、失禁パッド、使い捨ておむつ、生理用ナプキン、母乳パッドなどの人体から排出される体液を吸収するために用いられる吸収性物品が挙げられる。
(嵩密度の測定方法)
JIS K6219−2(2005)に準じて嵩密度の測定を行う。試料である吸水性樹脂粉末を、質量及び容量既知の円筒容器(直径100mmのステンレス製容器、容量1000ml)の中心部へ該容器の上端から50mm以下の高さから注ぎ込む。このとき、注ぎ込まれた試料が円筒容器の上端よりも上方で三角錐を形成するように、十分な量の試料を円筒容器内に注ぎ込む。そして、へらを用いて円筒容器の上端よりも上方にある余剰の試料を払い落とし、この状態で該容器の質量を測定し、その測定値から容器の質量を差し引くことで、試料の質量を求め、これを容器の容量で除して、目的とする嵩密度を算出する。測定は5回行い(n=5)、上下各1点の値を削除し、残る3点の平均値を測定値とした。なお、これらの測定は23±2℃、相対湿度50±5%で行い、測定の前に試料を同環境で24時間以上保存した後に測定する。
100mLのガラスビーカーに、生理食塩水(0.9質量%塩化ナトリウム水)50mLとマグネチックスターラーチップ(中央部直径8mm、両端部直径7mm、長さ30mmで、表面がフッ素樹脂コーティングされているもの)を入れ、ビーカーをマグネチックスターラー(アズワン製、「HPS−100」)に載せる。マグネチックスターラーの回転数を600±60rpmに調整し、生理食塩水を撹拌させる。試料2.0gを、撹拌中の食塩水の渦の中心部で液中に投入し、JIS K 7224(1996)に準拠して該吸水性樹脂粉末の吸水速度(秒)を測定する。具体的には、試料である吸水性樹脂粉末のビーカーへの投入が完了した時点でストップウォッチをスタートさせ、スターラーチップが試験液に覆われた時点(渦が消え、液表面が平らになった時点)でストップウォッチを止め、その時間(秒)を吸水速度として記録する。測定は5回行い(n=5)、上下各1点の値を削除し、残る3点の平均値を測定値とした。なお、これらの測定は23±2℃、相対湿度50±5%で行い、測定の前に試料を同環境で24時間以上保存した後に測定する。
100mLのガラスビーカーに、試料である吸水性樹脂粉末0.32±0.005gを生理食塩水(0.9質量%塩化ナトリウム水)100mLに浸して60分間放置することで膨潤させた。別途、垂直に立てた円筒(内径25.4mm)の開口部の下端に、金網(目開き150μm、株式会社三商販売のバイオカラム焼結ステンレスフィルター30SUS)と、コック(内径2mm)付き細管(内径4mm、長さ8cm)とが備えられた濾過円筒管を用意し、コックを閉鎖した状態で円筒管内に、膨潤した測定試料を含む前記ビーカーの内容物全てを投入する。次いで、目開きが150μmで直径が25mmである金網を先端に備えた直径2mmの円柱棒を濾過円筒管内に挿入して、金網と測定試料とが接するようにし、更に測定試料に2.0kPaの荷重が加わるようおもりを載せる。この状態で1分間放置した後、コックを開いて液を流し、濾過円筒管内の液面が60mLの目盛り線から40mLの目盛り線に達する(つまり20mLの液が通過する)までの時間T1(秒)を計測する。計測された時間T1(秒)を用い、次式から2.0kPaでの荷重下通液速度を算出する。なお、式中、T0(秒)は、濾過円筒管内に測定試料を入れないで、生理食塩水20mlが金網を通過するのに要する時間を計測した値である。
荷重下通液速度(秒)=(T1−T0)
測定は5回行い(n=5)、上下各1点の値を削除し、残る3点の平均値を測定値とした。なお、これらの測定は23±2℃、相対湿度50±5%で行い、測定の前に試料を同環境で24時間以上保存した後で測定する。
試料10.0gを底面の直径52mm、高さ22mmのアルミニウムカップ(東洋エコー株式会社、ホイルコンテナー、品番107)に均一に入れ、40℃、相対湿度80%RHの恒温恒湿槽中で3時間静置する。その後12メッシュの金網(目開き1.4mm)で軽く篩い、吸湿によりブロッキングして12メッシュをパスしない測定サンプルの粉末状物の質量、および12メッシュをパスした試料の質量を測定し、次式に従って目的とする吸湿ブロッキング率を算出する。
吸湿ブロッキング率(%)=100×(放置後の12メッシュをパスしない試料の質量)/(放置後の12メッシュをパスしない試料の質量+放置後の12メッシュをパスした試料の質量)
測定は5回行い(n=5)、上下各1点の値を削除し、残る3点の平均値を測定値とした。なお、測定は23±2℃、湿度50±5%で行い、測定の前に試料を同環境で24時間以上保存した後で測定する。
吸収倍率の測定は、JIS K 7223(1996)に準拠して行う。目開き63μmのナイロン網(JIS Z8801−1:2000)を幅10cm、長さ40cmの長方形に切断して長手方向中央で二つ折りにし、両端をヒートシールして幅10cm(内寸9cm)、長さ20cmのナイロン袋を作製する。測定試料1.00gを精秤し、作製したナイロン袋の底部に均一になるように入れる。試料の入ったナイロン袋を、生理食塩水に浸漬させる。浸漬開始から60分後にナイロン袋を生理食塩水から取り出し、1時間垂直状態に吊るして水切りした後、試料の質量F1(g)を測定する。また、試料を用いないで同様の操作を行い、そのときの質量F0(g)を測定する。そして、これら質量F1、F0および試料の質量から、次式に従って、目的とする吸収倍率を算出する。
吸収倍率(g/g)=(F1−F0)/試料の質量
保水量の測定は、JIS K 7223(1996)に準拠して行う。目開き63μmのナイロン網(JIS Z8801−1:2000)を幅10cm、長さ40cmの長方形に切断して長手方向中央で二つ折りにし、両端をヒートシールして幅10cm(内寸9cm)、長さ20cmのナイロン袋を作製する。測定試料1.00gを精秤し、作製したナイロン袋の底部に均一になるように入れる。試料の入ったナイロン袋を、生理食塩水に浸漬させる。浸漬開始から60分後にナイロン袋を生理食塩水から取り出し、1時間垂直状態に吊るして水切りした後、遠心脱水器(コクサン(株)製、型式H−130C特型)を用いて脱水する。脱水条件は、143G(800rpm)で2分間とする。脱水後の質量R1(g)を測定する。また、試料を用いないで同様の操作を行い、そのときの質量R0(g)を測定する。そして、これら質量R1、R0および試料の質量から、次式に従って、目的とする保水量を算出する。
保水量(g/g)=(R1−R0−試料の質量)/試料の質量
<合成例1>
水溶性エチレン性不飽和モノマー(a1−1){アクリル酸、三菱化学株式会社製、純度100%}155質量部(2.15モル部)、内部架橋剤(b1){ペンタエリスリトールトリアリルエーテル、ダイソ−株式会社製}0.6225質量部(0.0024モル部)及び脱イオン水340.27質量部を撹拌・混合しながら1℃に保った。この混合物中に窒素を流入して溶存酸素量を0.1ppm以下とした後、1質量%過酸化水素水溶液0.31質量部、1質量%アスコルビン酸水溶液1.1625質量部及び0.5質量%の2,2’−アゾビス[2−メチル−N−(2−ヒドロキシエチル)−プロピオンアミド]水溶液2.325質量部を添加・混合して重合を開始させた。混合物の温度が85℃に達した後、85±2℃で約10時間重合することにより含水ゲル(1)を得た。
「細断ゲル(2)を通気型バンド乾燥機{200℃、風速5m/秒}で乾燥」を「細断ゲル(2)を通気型バンド乾燥機{150℃、風速5m/秒}で乾燥」に変更したこと以外、合成例1と同様にして、吸水性樹脂粉末2を得た。
「細断ゲル(2)を通気型バンド乾燥機{200℃、風速5m/秒}で乾燥」を「細断ゲル(2)を通気型バンド乾燥機{150℃、風速2m/秒}で乾燥」に変更したこと以外、合成例1と同様にして、吸水性樹脂粉末3を得た。
「重量平均粒子径を400μmに調整」を「重量平均粒子径を530μmに調整」に変更したこと以外、合成例3と同様にして、吸水性樹脂粉末4を得た。
「重量平均粒子径を400μmに調整」を「重量平均粒子径を320μmに調整」に変更したこと以外、合成例2と同様にして、吸水性樹脂粉末5を得た。
「重量平均粒子径を400μmに調整」を「重量平均粒子径を280μmに調整」に変更したこと以外、合成例1と同様にして、吸水性樹脂粉末6を得た。
「(B)表面改質剤としてシリカ(東新化成株式会社製、「アエロジル380」)0.5質量部、及び、カルボキシ変性ポリシロキサン(信越化学工業株式会社製、「X−22−3701E」)0.02質量部」を「(B)表面改質剤としてシリカ(東新化成株式会社製、「アエロジル380」)0.5質量部」に変更したこと以外、合成例2と同様にして、吸水性樹脂粉末7を得た。
「(B)表面改質剤としてシリカ(東新化成株式会社製、「アエロジル380」)0.5質量部、及び、カルボキシ変性ポリシロキサン(信越化学工業株式会社製、「X−22−3701E」)0.02質量部」を「(B)表面改質剤としてシリカ(東新化成株式会社製、「アエロジル200」)0.5質量部」に変更したこと以外、合成例2と同様にして、吸水性樹脂粉末8を得た。
「(B)表面改質剤としてシリカ(東新化成株式会社製、「アエロジル380」)0.5質量部、及び、カルボキシ変性ポリシロキサン(信越化学工業株式会社製、「X−22−3701E」)0.02質量部」を「(B)表面改質剤としてカルボキシ変性ポリシロキサン(信越化学工業株式会社製、「X−22−3701E」)0.02質量部」に変更したこと以外、合成例2と同様にして、吸水性樹脂粉末9を得た。
「(B)表面改質剤としてシリカ(東新化成株式会社製、「アエロジル380」)0.5質量部、及び、カルボキシ変性ポリシロキサン(信越化学工業株式会社製、「X−22−3701E」)0.02質量部」を「(B)表面改質剤としてアミノ変性ポリシロキサン(信越化学工業株式会社製、「KF−880」)0.02質量部」に変更したこと以外、合成例2と同様にして、吸水性樹脂粉末10を得た。
「重量平均粒子径を400μmに調整」を「重量平均粒子径を600μmに調整」に変更したこと以外、合成例1と同様にして、比較吸水性樹脂粉末1を得た。
「重量平均粒子径を400μmに調整」を「重量平均粒子径を280μmに調整」に変更したこと以外、合成例2と同様にして、比較吸水性樹脂粉末2を得た。
100質量部の吸水性樹脂粉末7に対し、ポリエチレングリコール(三洋化成工業製、「PEG200」)2質量部を加えて、85℃で60分撹拌させた。得られた樹脂粉末の重量平均粒子径を400μmに調整して、比較吸水性樹脂粉末3を得た。
市販品(住友精化株式会社製、「アクアキープSA60SXII」)を比較吸水性樹脂粉末4として用いた。
<吸収体1>
第1シートとして、エアスルー不織布(金星製紙株式会社製、「LD18」、目付け18g/m2)を用いた。ポリエステル原綿(芯鞘構造(芯:ポリエチレンテレフタレート、鞘:ポリエチレン))を開繊し得られた短繊維をエアレイ法により、第1シート上に堆積させて第1ウエブ層を形成した。得られた第1ウエブ層上に、吸水性樹脂粉末1を散布した。吸水性樹脂粉末1上に、ポリエステル原綿(芯鞘構造(芯:ポリエチレンテレフタレート、鞘:ポリエチレン))を開繊し得られた短繊維をエアレイ法により、堆積させて第2ウエブ層を形成した。第2ウエブ層上に、第2シートとしてのエアスルー不織布(金星製紙株式会社製、「LD18」、目付け18g/m2)を積層して積層体を得た。得られた積層体を、表面温度が150℃の加圧ロールで処理して、吸収体No.1を得た。
「吸水性樹脂粉末1」を「吸水性樹脂粉末2〜10」または「比較吸水性樹脂粉末1〜4」に変更したこと以外は、吸収体No.1と同様にして吸収体No.2〜10、比較吸収体No.1〜4を得た。
SAP目付け、または原綿目付けを変更したこと以外は、吸収体No.2と同様にして吸収体No.11〜14を得た。
第1シートとして、エアスルー不織布(金星製紙株式会社製、「LD18」、目付け18g/m2)を用いた。ポリエステル原綿(芯鞘構造(芯:ポリエチレンテレフタレート、鞘:ポリエチレン))を開繊し得られた短繊維と、吸水性樹脂粉末2とを混合し、得られた混合物をエアレイ法により、第1シート上に堆積させてウエブ層を形成した。得られたウエブ層上に、第2シートとしてのエアスルー不織布(金星製紙株式会社製、「LD18」、目付け18g/m2)を積層して積層体を得た。得られた積層体を、表面温度が150℃の加圧ロールで処理して、吸収体No.15を得た。
「吸水性樹脂粉末2」を「比較吸水性樹脂粉末1」に変更したこと以外は、吸収体No.15と同様にして比較吸収体No.5を得た。
第1シートとしてのスパンレース不織布(目付け35g/m2)の上に合成ゴム系ホットメルト接着剤(目付け10g/m2)を塗布した後、吸水性樹脂粉末2を散布した。吸水性樹脂粉末2上に、第2シートとしてのエアスルー不織布(目付け18g/m2)を積層して、積層体を得た。得られた積層体を170℃で熱圧着して、吸収体No.16を得た。
「吸水性樹脂粉末2」を「比較吸水性樹脂粉末1」に変更したこと以外は、吸収体No.15と同様にして比較吸収体No.6を得た。
<実施例1>
上から順に透液性エアスルー不織布、吸収体No.1、拡散層、不透液性ポリエチレンシートを積層して吸収性物品1を作製した。前記吸収体No.1の平面視形状は長方形(長手方向45cm、幅方向20cm)とした。前記拡散層には、セルロースアセテート原綿(ダイセル社製、平均置換度2.4、繊維断面形状:Y型)を用いた。この拡散層は実質的に吸収性を有さない。前記拡散層の平面視形状は長方形(長手方向42cm、幅方向18cm)、セルロースアセテート原綿の目付けを250g/m2とした。なお、吸収体の中心と拡散層の中心が一致するように配置した。
「吸収体No.1」を「吸収体No.2〜16」または「比較吸収体No.1〜6」に変更したこと以外は、実施例1と同様にして、吸収性物品2〜16、比較吸収性物品1〜6を得た。
人工尿(塩化カリウム0.03質量%、硫酸マグネシウム0.08質量%、塩化ナトリウム0.8質量%及び脱イオン水99.09質量%)の中に吸収性物品を浸し、60分放置して調製し、十分に湿らせた吸収性物品を作製した。また、吸収性物品を80℃、2時間加熱乾燥して、十分に乾燥させた吸収性物品を作製した。十分に湿らせた吸収性物品の上に、SDME(Surface Dryness Measurement Equipment)試験器(WK system社製)の検出器を置き、100%ドライネス値を設定した。次に、十分に乾燥させた吸収性物品の上に、SDME試験器の検出器を置き0%ドライネスを設定し、SDME試験器の校正を行った。次に、測定する吸収性物品の中央に金属リング(内径50mm、長さ50mm)をセットし、人工尿20mlを注入し、30分放置後2回目の人口尿20mlを注入した。2回目の人工尿を吸収し終えるまでの時間を測定し吸収速度を求めた。吸収し終えた後、直ちに金属リングを取り去り、吸収性物品の中央にSDME検出器を載せて、表面ドライネス値の測定を開始し、測定開始から2分後、および4分後の値を記録した。なお、人工尿、測定雰囲気及び放置雰囲気は、25±5℃、65±10%RHで行った。結果を表3に示した。
拡散層の繊維を表4に示した繊維に変更したこと以外は、実施例2と同様にして、比較吸収性物品7〜20を得た。比較吸収性物品20の拡散層はレーヨン繊維(再生植物繊維)からなり、吸収性を有する。
人工尿(塩化カリウム0.03質量%、硫酸マグネシウム0.08質量%、塩化ナトリウム0.8質量%及び脱イオン水99.09質量%)の中に吸収性物品を浸し、60分放置して調製し、十分に湿らせた吸収性物品を作製した。また、吸収性物品を80℃、2時間加熱乾燥して、十分に乾燥させた吸収性物品を作製した。十分に湿らせた吸収性物品の上に、SDME(Surface Dryness Measurement Equipment)試験器(WK system社製)の検出器を置き、100%ドライネス値を設定した。次に、十分に乾燥させた吸収性物品の上に、SDME試験器の検出器を置き0%ドライネスを設定し、SDME試験器の校正を行った。次に、測定する吸収性物品の中央に金属リング(内径50mm、長さ50mm)をセットし、人工尿20mlを注入し、30分放置後2回目の人口尿20mlを注入し、さらに30分放置後3回目の人口尿20mlを注入した。3回目の人工尿を吸収し終えるまでの時間を測定し吸収速度を求めた。吸収し終えた後、直ちに金属リングを取り去り、吸収性物品の中央にSDME検出器を載せて、表面ドライネス値の測定を開始し、測定開始から2分後、および4分後の値を記録した。さらに30分放置後、4回目の人口尿20mlを注入した。4回目の人工尿を吸収し終えるまでの時間を測定し吸収速度を求めた。吸収し終えた後、直ちに金属リングを取り去り、吸収性物品の中央にSDME検出器を載せて、表面ドライネス値の測定を開始し、測定開始から2分後、および4分後の値を記録した。なお、人工尿、測定雰囲気及び放置雰囲気は、25±5℃、65±10%RHで行った。結果を表4に示した。
Claims (9)
- 下記(a)〜(d)の要件を満足する吸水性樹脂粉末が配置された吸水層と、前記吸水層の下層に配置され、セルロースアセテート繊維を含む拡散層とを有することを特徴とする吸収性物品。
(a)嵩密度:0.45g/ml〜0.62g/ml
(b)ボルテックス法による吸収速度:20秒〜50秒
(c)荷重下通液速度:10秒以下
(d)吸湿ブロッキング率:5%以下 - 前記吸水性樹脂粉末の吸収倍率が、40g/g〜55g/gである請求項1に記載の吸収性物品。
- 前記吸水性樹脂粉末の保水量が、20g/g〜45g/gである請求項1または2に記載の吸収性物品。
- 前記吸水性樹脂粉末は、(a1)水溶性エチレン性不飽和モノマーおよび/または加水分解により(a1)水溶性エチレン性不飽和モノマーを生成する(a2)加水分解性モノマーと、(b)内部架橋剤とを含有する単量体組成物を重合してなる(A)架橋重合体を、(B)表面改質剤で処理して得られたものである請求項1〜3のいずれか一項に記載の吸収性物品。
- 前記(B)表面改質剤の処理量が、前記(A)架橋重合体100質量部に対して、0.001質量部〜1質量部である請求項4に記載の吸収性物品。
- 前記(B)表面改質剤が、アミノ変性ポリシロキサン、カルボキシ変性ポリシロキサン、および、シリカよりなる群から選択される少なくとも一種である請求項4または5に記載の吸収性物品。
- 前記吸水層が、吸水性樹脂粉末を内包した複数の吸水性樹脂粉末存在領域と、この吸水性樹脂粉末存在領域に隣接する吸水性樹脂粉末非存在領域とを有している請求項1〜6のいずれか一項に記載の吸収性物品。
- 前記吸水層が、エアレイ法によって作製されたエアレイド吸水層であり、かつ前記吸水性樹脂粉末の質量比率が、エアレイド吸水層の全質量に対して62質量%〜99.5質量%である請求項1〜7のいずれか一項に記載の吸収性物品。
- 前記吸水層の平面視形状が、前記拡散層の平面視形状と略同一またはそれよりも大きく形成されており、前記吸水層が拡散層の上面の全面を覆うように配置されている請求項1〜8のいずれか一項に記載の吸収性物品。
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Also Published As
Publication number | Publication date |
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EP2907493A1 (en) | 2015-08-19 |
CN104736116A (zh) | 2015-06-24 |
EP2907493B1 (en) | 2017-11-29 |
WO2014061379A1 (ja) | 2014-04-24 |
EP2907493A4 (en) | 2016-07-20 |
JP6128791B2 (ja) | 2017-05-17 |
CN104736116B (zh) | 2018-05-29 |
US9492583B2 (en) | 2016-11-15 |
TW201420088A (zh) | 2014-06-01 |
US20160199527A1 (en) | 2016-07-14 |
TWI590810B (zh) | 2017-07-11 |
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