JP7022152B2 - 吸収体及び吸収性物品 - Google Patents
吸収体及び吸収性物品 Download PDFInfo
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- JP7022152B2 JP7022152B2 JP2019562711A JP2019562711A JP7022152B2 JP 7022152 B2 JP7022152 B2 JP 7022152B2 JP 2019562711 A JP2019562711 A JP 2019562711A JP 2019562711 A JP2019562711 A JP 2019562711A JP 7022152 B2 JP7022152 B2 JP 7022152B2
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Description
また本発明は、前記の本発明の吸収体を具備する吸収性物品である。
乾燥した濾紙の中央部に生理食塩水1gを付与して該中央部を湿らし、水平な台の上に載置された該濾紙の該中央部に、測定対象の吸水性ポリマー0.1gを均一に散布する。例えば、アドバンテック東洋製濾紙No.4A(φ150)の中央部(φ100)を生理食塩水で湿らし、該中央部に吸水性ポリマーを均一散布することができる。吸水性ポリマーを散布してから1分経過後、濾紙を垂直に傾けた状態で台の上方5mmの位置で支持し、該支持を解除して該濾紙を落下させる。この濾紙の落下操作を100回繰り返し、その間に濾紙から脱落した吸水性ポリマーの総重量aと、濾紙上に残留した吸水性ポリマーの総重量bとから、次式により吸水性ポリマーの粘着率を算出する。粘着率=b/(a+b)
(手順2)測定サンプルの全体を生理食塩水に浸漬し、浸漬開始から30分後に該測定サンプルを該生理食塩水から取り出す。
(手順3)容量300mlのビーカーに直径35mm、軸方向長さ12mmの円柱形撹拌子及び生理食塩水300mlを入れ、マグネティックスターラーを用いて回転数600±5rpmで該攪拌子を回転させて該生理食塩水を攪拌する。この攪拌中の生理食塩水に前記手順2を経た測定サンプルを投入し、その投入から30秒後に該測定サンプルを該生理食塩水から取り出す。
(手順4)前記手順3を経た湿潤状態の測定サンプルを、槽内の温度が105℃に設定された恒温槽の該槽内に12時間静置した後、その乾燥状態の測定サンプルの重量(攪拌処理後サンプル重量)を測定する。
(手順5)前記初期サンプル重量及び前記攪拌処理後サンプル重量それぞれから吸水性ポリマー以外の部材の総重量を減算し、初期吸水性ポリマー重量(W0)及び攪拌処理後吸水性ポリマー重量(W1)をそれぞれ算出する。そして次式により、測定サンプル(吸収性シート)の吸水性ポリマー固定率を算出する。
吸水性ポリマーの固定率(%)=(W1/W0)×100
また、前記手順1において、測定サンプルとして、5cm四方の吸収性シートを用意できない場合(例えば、吸収性シートのサイズが小さいために、測定サンプルのサイズが5cm四方に満たない場合)は、評価対象のシートからサイズが5cm四方に満たない小サイズの測定サンプルを複数採取し、それら複数の測定サンプルの片面の面積の合計が25cm2となるようにする。そして、複数の測定サンプルそれぞれについて、前記手順1~5に従って吸水性ポリマー固定率を測定し、そうして得られた複数の吸水性ポリマー固定率の平均値を、当該吸収性シートの吸水性ポリマー固定率とする。
・マグネティックスターラー:HI-304N(HANNA社製、反転スターラー)
・攪拌子:スターヘッド NALGENE(6600-0035)〔35φ×12mm〕
・ビーカー:300ml〔78φ×103mm〕
前記シリコーン系接着剤の素材(ベースポリマー)としては、例えば、ポリジメチルシロキサンポリマー重合体を例示できる。
前記ゴム系接着剤の素材(ベースポリマー)としては、例えば、天然ゴム、ポリイソプレン、スチレン-ブタジエン共重合体(SBR)、スチレン-イソプレン-スチレンブロック共重合体(SIS)、スチレン-ブタジエン-スチレンブロック共重合体(SBS)、スチレン-エチレン-ブタジエン-スチレンブロック共重合体(SEBS)、スチレン-エチレン-プロピレン-スチレンブロック共重合体(SEPS)を例示できる。
同様の観点から、基材層20の坪量は、好ましくは5g/m2以上、さらに好ましくは8g/m2以上、そして、好ましくは40g/m2以下、さらに好ましくは25g/m2以下である。
測定台に重さ2.5g、半径12.5mmの円形プレートを載置し、その状態での円形プレートの上面の位置を測定の基準点Aとする。次に円形プレートを取り除き、測定台に測定対象を置き、その上に円形プレートを再び載置し、その状態での円形プレートの上面の位置を位置Bとする。測定機器にはレーザ変位計(株式会社キーエンス製、CCDレーザ変位センサーLK-080)を用いる。前記基準点Aと前記位置Bとの差を、測定対象の厚み、即ち、測定対象の0.5cN/cm2(=0.05kPa)圧力下での厚みとする。
繊維交絡層3における吸水性ポリマー含有率R3Pは、好ましくは55質量%以上、さらに好ましくは60質量%以上、そして、好ましくは80質量%以下、さらに好ましくは70質量%以下である。
繊維交絡層3における繊維含有率R3Fは、好ましくは20質量%以上、さらに好ましくは30質量%以上、そして、好ましくは45質量%以下、さらに好ましくは40質量%以下である。
吸収層側30(吸収層21との隣接面側)における繊維3Fの含有率は、該吸収層側30の全質量に対して、好ましくは30質量%以上、さらに好ましくは40質量%以上、そして、好ましくは100質量%以下、さらに好ましくは90質量%以下である。
非吸収層側31における繊維3Fの含有率は、該非吸収層側31の全質量に対して、好ましくは10質量%以上、さらに好ましくは20質量%以上、そして、好ましくは80質量%以下、さらに好ましくは70質量%以下である。
例えば前記実施形態では、吸収層21は基材層20の片面のみに形成されていたが、基材層20の両面に形成されていてもよく、即ち、基材層20の両面に吸水性ポリマーP1が固定されていてもよい。特に、図4に示す吸収体1Cにおいて、基材層20の両面に吸収層21が形成されていると、帯状基材層20Sがヨレて反転しても、吸水性ポリマーP1と繊維交絡層3との接触が維持されるという効果が奏される。
<2> 前記吸収層の吸水性ポリマーが、ホットメルト接着剤によって前記基材層の一面に固定されている前記<1>に記載の吸収体。
<3> 前記基材層が不織布又は樹脂フィルムを含む前記<1>又は<2>に記載の吸収体。
<4> 前記繊維交絡層がパルプ繊維を含む前記<1>~<3>のいずれか1項に記載の吸収体。
<6> 前記繊維交絡層における前記吸水性ポリマーの含有率が、該繊維交絡層の全質量に対して、好ましくは20質量%以上、さらに好ましくは50質量%以上、そして、好ましくは80質量%以下、さらに好ましくは70質量%以下である前記<5>に記載の吸収体。
<7> 前記繊維交絡層における前記吸水性ポリマーの含有率の方が、該繊維交絡層における繊維の含有率よりも高い前記<5>又は<6>に記載の吸収体。
<8> 前記繊維交絡層における前記吸水性ポリマーの含有率と該繊維交絡層における繊維の含有率との比が、前者>後者を前提として、前者/後者として、好ましくは1.1以上、さらに好ましくは1.3以上、そして、好ましくは3.5以下、さらに好ましくは2.5以下である前記<7>に記載の吸収体。
<9> 前記繊維交絡層における前記吸水性ポリマーの含有率が、好ましくは55質量%以上、さらに好ましくは60質量%以上、そして、好ましくは80質量%以下、さらに好ましくは70質量%以下である前記<7>又は<8>に記載の吸収体。
<10> 前記繊維交絡層における繊維の含有率が、好ましくは20質量%以上、さらに好ましくは30質量%以上、そして、好ましくは45質量%以下、さらに好ましくは40質量%以下である前記<7>~<9>のいずれか1項に記載の吸収体。
<11> 前記繊維交絡層の前記吸水性ポリマーが、前記吸収層に入り込んでいる前記<5>~<10>のいずれか1項に記載の吸収体。
<12> 前記繊維交絡層において、前記吸収層との隣接面側(前記吸収層側)の方が、該隣接面とは反対側(非吸収層側)よりも繊維の含有率が高い前記<5>~<11>のいずれか1項に記載の吸収体。
<13> 前記繊維交絡層において、繊維が前記吸収層との隣接面側(前記吸収層側)に偏在し、前記吸水性ポリマーが該吸収層側とは反対側(非吸収層側)に偏在している前記<5>~<12>のいずれか1項に記載の吸収体。
<15> 前記繊維交絡層の前記吸収層側とは反対側(非吸収層側)における繊維の含有率が、該反対側の全質量に対して、好ましくは10質量%以上、さらに好ましくは20質量%以上、そして、好ましくは80質量%以下、さらに好ましくは70質量%以下である前記<1>~<14>のいずれか1項に記載の吸収体。
<16> 前記繊維交絡層における繊維の坪量が、好ましくは50g/m2以上、さらに好ましくは90g/m2以上、そして、好ましくは200g/m2以下、さらに好ましくは170g/m2以下である前記<1>~<15>のいずれか1項に記載の吸収体。
<17> 前記繊維交絡層は、繊維どうしの融着による結合点を有しておらず、カード法若しくはエアレイド法によって製造されたウエブ、又はパルプシートの解繊物の積繊体である前記<1>~<16>のいずれか1項に記載の吸収体。
<19> 前記吸収層の前記吸水性ポリマーの粘着率が、好ましくは0.5以上、さらに好ましくは0.7以上、そして、好ましくは0.95以下、さらに好ましくは0.85以下である前記<1>~<18>のいずれか1項に記載の吸収体。
<20> 前記吸収層における繊維の含有率が、該吸収層の全質量に対して、好ましくは30質量%以下、さらに好ましくは10質量%以下であり、より好ましくはゼロ即ち該吸収層に繊維が全く含まれていない前記<1>~<19>のいずれか1項に記載の吸収体。
<21> 前記吸収層が前記基材層の両面に形成されている前記<1>~<20>のいずれか1項に記載の吸収体。
<22> 繊維の含有率が、前記繊維交絡層の前記吸収層との隣接面側、該繊維交絡層の該隣接面とは反対側、前記吸収層の順で高い前記<1>~<21>のいずれか1項に記載の吸収体。
<24> 前記基材層は、一方向に長い複数の帯状基材層を含んで構成され、該複数の帯状基材層は、それらの長手方向を一致させて、該長手方向と直交する幅方向に隣り合うように配されている前記<1>~<23>のいずれか1項に記載の吸収体。
<25> 前記複数の帯状基材層どうしは、それらの一部が分断されずに一体となっている前記<24>に記載の吸収体。
<26> 前記<1>~<25>のいずれか1項に記載の吸収体を具備する吸収性物品。
<27> 前記吸収体は、前記繊維交絡層が前記吸収性シートよりも着用者の肌から近くなるように配されている前記<26>に記載の吸収性物品。
Claims (19)
- 基材層、及び該基材層の一面に固定された吸水性ポリマーを含む吸収層を有する吸収性シートと、繊維交絡層とを備え、該吸収層の吸水性ポリマーと該繊維交絡層とが隣接しており、
前記基材層は、一方向に長い複数の帯状基材層を含んで構成され、該複数の帯状基材層は、それらの長手方向を一致させて、該長手方向と直交する幅方向に隣り合うように配されている吸収体。 - 前記吸収層の吸水性ポリマーが、ホットメルト接着剤によって前記基材層の一面に固定されている請求項1に記載の吸収体。
- 前記基材層が不織布又は樹脂フィルムを含む請求項1又は2に記載の吸収体。
- 前記繊維交絡層がパルプ繊維を含む請求項1~3のいずれか1項に記載の吸収体。
- 前記繊維交絡層が吸水性ポリマーを含む請求項1~4のいずれか1項に記載の吸収体。
- 前記繊維交絡層における前記吸水性ポリマーの含有率が、該繊維交絡層の全質量に対して、20質量%以上80質量%以下である請求項5に記載の吸収体。
- 前記繊維交絡層における前記吸水性ポリマーの含有率の方が、該繊維交絡層における繊維の含有率よりも高い請求項5又は6に記載の吸収体。
- 前記繊維交絡層における前記吸水性ポリマーの含有率と該繊維交絡層における繊維の含有率との比が、前者>後者を前提として、前者/後者として、1.1以上3.5以下である請求項7に記載の吸収体。
- 前記繊維交絡層において、前記吸収層との隣接面側の方が、該隣接面とは反対側よりも繊維の含有率が高い請求項5~8のいずれか1項に記載の吸収体。
- 前記繊維交絡層において、繊維が前記吸収層との隣接面側に偏在し、前記吸水性ポリマーが該吸収層側とは反対側に偏在している請求項5~9のいずれか1項に記載の吸収体。
- 前記繊維交絡層の前記吸収層との隣接面側における繊維の含有率が、該隣接面側の全質量に対して、30質量%以上100質量%以下である請求項1~10のいずれか1項に記載の吸収体。
- 前記繊維交絡層は、繊維どうしの融着による結合点を有しておらず、カード法若しくはエアレイド法によって製造されたウエブ、又はパルプシートの解繊物の積繊体である請求項1~11のいずれか1項に記載の吸収体。
- 前記吸収層の前記吸水性ポリマーの前記基材層に対する固定率が、10%以上90%以下である請求項1~12のいずれか1項に記載の吸収体。
- 前記吸収層の前記吸水性ポリマーの粘着率が、0.5以上0.95以下である請求項1~13のいずれか1項に記載の吸収体。
- 前記吸収層が前記基材層の両面に形成されている請求項1~14のいずれか1項に記載の吸収体。
- 繊維の含有率が、前記繊維交絡層の前記吸収層との隣接面側、該繊維交絡層の該隣接面とは反対側、前記吸収層の順で高い請求項1~15のいずれか1項に記載の吸収体。
- さらに、前記吸収性シート及び前記繊維交絡層を一体的に被覆する被覆シートを備える請求項1~16のいずれか1項に記載の吸収体。
- 前記複数の帯状基材層どうしは、それらの一部が分断されずに一体となっている請求項1~17のいずれか1項に記載の吸収体。
- 請求項1~18のいずれか1項に記載の吸収体を具備する吸収性物品。
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