JP5431307B2 - 段階的容量挙動を示す吸収性組成物 - Google Patents
段階的容量挙動を示す吸収性組成物 Download PDFInfo
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- JP5431307B2 JP5431307B2 JP2010504917A JP2010504917A JP5431307B2 JP 5431307 B2 JP5431307 B2 JP 5431307B2 JP 2010504917 A JP2010504917 A JP 2010504917A JP 2010504917 A JP2010504917 A JP 2010504917A JP 5431307 B2 JP5431307 B2 JP 5431307B2
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- absorbent
- trigger mechanism
- polymer composition
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- superabsorbent polymer
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- Compositions Of Macromolecular Compounds (AREA)
- Multicomponent Fibers (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Description
修正された遠心保持容量(Modified Centrifuge Retention Capacity(mCRC))試験
この試験は、ヒドロゲルを形成するポリマーの限定された液体条件における自由膨潤容量を決定する。得られる保持容量は、試料(g/g)のグラム重量当たりに保持される液体のグラム量として表される。この方法では、300から600μmの粒群の乾燥超吸収性ポリマー組成物粒子0.2000±0.0050gがティーバッグに入れられる。超吸収性ポリマー組成物粒子を、例えば、米国オハイオ州メンターに事業所を持つW.S.タイラー社から入手可能なRO-TAP 機械式ふるい振とう機Model Bを用いて事前にふるい分けすることができる。ふるいは、10分間行われる。形式番号1234Tの熱シール可能なフィルター紙等の例えばDexter Corporation (米国コネチカット州Windsor Locksに事業所を持つ)から入手可能な熱シール可能なティーバッグ材料が大半の用途で役に立つ。バッグは、このバッグ材料の5インチ×3インチ(12.7cm×7.6cm)のサンプルを半分に折り、開放端のうちの2つを熱シールし2.5インチ×3インチ(6.4cm×7.6cm)の矩形のパウチを形成することにより作成される。熱シール部は、材料の端部の内側約0.25インチ(0.6cm)である。
サンプルをパウチ内に入れた後、パウチの残っていた開放端も熱シールされる。空のバッグも対象例として用いられるべく作成することができる。10mlの生理的食塩水溶液(すなわち、0.9重量%の塩化ナトリウム水溶液)が容器内に入れられる。容器は、ティーバッグを平置きできるように十分大きいが、生理的食塩水が過度に大きな面積にわたって広がることを防止するべく十分に小さい。生理的食塩水のための容器は、8から15平方インチ(52から97平方cm)の底部断面積を持つべきである。適切な容器は、VWR International(米国、ペンシルバニア州、ウェストチェスターに事業所を持つ)から入手可能なカタログナンバー25384-056の直径100mmのペトリ皿である。ティーバッグは、完全に湿潤するまで低く下げられて、生理的食塩水内に定められた時間置かれる(以下参照)。生理的食塩水内に定められた時間浸潤された後、290G(分散を含めて286から292G)で3分間遠心分離される。Gは、急速な加速あるいは重力を受ける物体にかかる慣性力の単位として定義され、海水面で32ft/sec/secに等しい。
吸収された生理的食塩水の量は、ティーバッグの重量を測ることにより決定される。バッグ自身により留められている溶液を考慮に入れると、超吸収性ポリマー組成物試料により留められている溶液の量が、定められた浸潤時間で、超吸収性ポリマー組成物のグラム当たりの流体のグラム量として表現された超吸収性ポリマー組成物の修正された遠心保持容量(mCRC)である。さらに具体的には、修正された遠心保持容量は、次の式により定義される。
((遠心分離後のサンプル及びバッグ重量)−(遠心分離後の空バッグ重量)−(乾燥サンプル重量))/(乾燥サンプル重量)
限定された液体条件下における超吸収性ポリマー組成物の自由膨潤容量を完全に特徴づけるために、超吸収性材料の複数のサンプルが上述したように準備され、複数のティーバッグに入れられる必要がある。各ティーバッグは、それぞれ自身の10mlの生理的食塩水溶液に浸潤されなければならない。個々のサンプルが生理的食塩水溶液に浸潤される時間は5分刻みで5から240分である。各浸潤時間は、ただ1つのレプリカで行われる。
本発明の典型的な容量の階段状膨潤挙動が仮説的に図17に示されている。データ点は、上述したように特定の浸潤時間で測定された容量値である。最初の(初期の)吸収容量は、図17に示されるように、膨潤曲線の最初のプラトーとして見ることができる。同様に、第2の吸収容量は、図17に示されるように、膨潤曲線の第2のプラトーとして見ることができる。それ以降の吸収容量は、同様に決定することができる。
・平坦な底部を有するプラスチックトレイ。このトレイは、その上にガラスフリットをその壁部に触れることなく載置することが可能な十分な広さを有する。この試験方法には、22.9cm×22.9cm(9インチ×9インチ)の底面積と、1.3〜2.5cm(0.5〜1インチ)の深さを有するプラスチックトレイが一般的に使用される。
・「C」(20〜25ミクロン)の空隙率を有する直径12.5cmの焼結ガラスフリット。このフリットは、食塩水中での平衡化により事前に作成される。フリットは、少なくとも2部の新鮮な食塩水で洗浄するのに加えて、AUL測定前に食塩水中に少なくとも12時間浸漬させるべきである。
・ワットマン(Whatman)社製のグレード1、直径12.5cmの円形のフィルタ紙。
・食塩水の供給(0.9重量%塩化ナトリウム蒸留水溶液)。
AUL(0.9psi)=(B−A)/SA
ただし、
A=乾燥SAPを含むAULユニットの重量
B=60分間吸収後の、SAPを含むAULユニットの重量
SA=実際のSAPの重量
・電子てんびん、0.001gの精度、100g最小容量。
・図4を参照して、膨潤率試験装置910は、負荷下吸収(AUL)試験方法で上述した、シリンダ920、ピストン930及び重り990を備えるAULアッセンブリ925を含む。ただし、AUL試験では317の重りを用いたが、ここでは、100gの重りを用いる。この100gの重りは、米国ペンシルベニア州のウエストチェスター所在のVWRインターナショナル(VWR International)社から部品番号12727-141として入手可能である、またはその同等物が使用される。
・膨潤率試験装置910は、超吸水体サンプル950の膨潤中に吸上げられた侵襲液体を除去するのに使用されるAULチャンバも含む。このユニットは、要求吸収性テスタ(demand absorbency tester:DAT)と同様である。この試験装置は、米国マサチューセッツ州ダナーズ所在のM/Kシステムズ社(M/K Systems)から入手可能なGATS(gravimetric absorbency test system:重力測定吸収性試験装置)、並びに、非特許文献3に説明されている装置と同様である(この文献は、本明細書の記載と矛盾しない限りにおいて、引用することを以って本明細書の一部となす)。直径2.5cmの領域内に限定して設けられたポートを有する、ポーテッドディスク935も利用される。
・液体層−ペトリ皿、プラスチック重り皿または過剰な液体を保持できる同様のもの。
・ステンレス鋼ワイヤまたは例えば8メッシュプラスチックスクリーンなどの大きな領域を有するプラスチックメッシュスクリーン。
・真空源‐吸引装置、ハウス真空ラインまたは真空ポンプ。
・側枝付きフラスコ960(図4)、フラスコの上部には、ゴム栓946及びチューブ955が嵌められている。
・ゴムまたはプラスチック製チューブ970(図4)。
・1秒間間隔で120分間計測可能なタイマー。
・ペーパータオルまたはティッシュ。
・静電気防止布。例えば、米国ニュージャージー州ワイコフ所在のイルフォードフォト社(Ilford Photo Corp.)から部品番号203547として入手可能なものまたは同等物。
・バルク超吸水性材料を示す粒径の分布が、試験に使用されるべきである。このことは、典型的には、回転分割機(spinning riffler)の使用を必要とする。適切な分割機は、英国ロンドン所在のマイクロスケール社(Microscal Limited)から市販されているModel SR 1Bである。分割機には、各個別のサンプル重量が0.160+/−0.005gmなどの十分な量の超吸水性材料を入れるべきである。
・真空装置。AULチャンバ940と側枝付きフラスコ960の上部にはめ込まれたチューブとを接続するのにチューブ970を使用する。真空源(図示せず)とフラスコ960の側枝980との間を接続するのにチューブ970を使用する。この側枝付きフラスコ960の目的は、サンプルから除去されたあらゆる液体を、真空装置に入る前に閉じ込めることである。側枝付きフラスコ960の安定性を高めるために、リングスタンドまたはリングスタンドと同様の固定器具にフラスコを取り付けることが望ましい。
・液体槽。液体槽皿(図示せず)の底部に、ワイヤメッシュ(図示せず)又は同様の大型メッシュプラスチックスクリーンを配置する。前記スクリーンは、AULアッセンブリ925を前記液体槽の上から下まで保持するように配置し、液体のサンプルへの自由なアクセスを可能にする。
(湿潤重量−乾燥重量)/(乾燥重量−容器重量)=超吸水性材料の湿潤率(液体g/超吸水体g)
従来のSAPは、次の特性を有する。
・平均粒径=400μm
・SAP拡散係数=2×10−6cm2/秒
・SAPのmCRC=30g/g
・平均粒径=400μm
・SAP拡散係数=6×10−6cm2/秒
・SAPのmCRC=30g/g
・1回目の侵襲及び保持期間:mCRC=8g/g
・2回目の侵襲及び保持期間:mCRC=15g/g
・3回目の侵襲及び保持期間:mCRC=21g/g
・70mlの液体侵襲を3回行い、その後、それぞれ4分、5分及び6分間保持する(すなわち、各液体侵襲間の間隔または侵襲後の時間)。
・吸収系における超吸水性材料の量=65重量%
・パッドの密度=0.24g/cc
・サージ材料の坪量=76gsm
・液体接触領域=21.5cm2、パッド810の前端縁部830から11.4cmの所に位置する(図13)。
・吸収系は、腹臥位状態で試験する。
・パッド形状840(図13)。
・平均粒径=400μm
・SAP拡散係数=2×10−6cm2/秒
・SAPのmCRC=30g/g
・70mlの液体侵襲を3回行い、その後、それぞれ4分、5分及び6分間保持する(すなわち、各液体侵襲間の間隔または侵襲後の時間)。
・吸収系における超吸水性材料の量=65重量%
・パッドの密度=0.24g/cc
・サージ材料の坪量=76gsm
・液体接触領域=21.5cm2、パッド810の前端縁部830から11.4cmの所に位置する(図13)。
・吸収系は、腹臥位状態で試験する。
・パッド形状840(図13)。
表4は、各回70mlの3回の液体侵襲時の吸上げ率をそれぞれ示す。
表7及び表8は、各回70mlの3回の液体侵襲時の吸上げ率及び標的領域の濡れ厚さをそれぞれ示す。
比較例(対照)の吸収物品は、従来の砂時計状の形状を有し、65%の市販の超吸水性材料と、35%の市販の針葉樹繊維を含む。各吸収性コアは、約24gm/cm3の乾燥密度を有し、各吸収物品は68gsmの吸い上げ層(すなわちサージ層)を含む。対照(比較例7)、段階的容量型オリジナル(例7−1)、段階的容量型Lite(例7−2)、段階的容量型X-Lite(例7−3)の各コードに、12個の物品を用いる。
Claims (13)
- 吸収性組成物であって、
少なくとも5g食塩水/1g組成物の第1の総吸収容量を有する超吸水性ポリマー組成物と、
カプセルに含まれ該カプセルが液体により溶解することにより放出され、吸収性組成物が流体と接触した後から各々が前記カプセルの溶解速度により決定される所定の解放時間後に前記超吸水性ポリマー組成物の吸収容量に影響を与え始める物質である、複数のトリガー機構として、第1のトリガー機構及び第2のトリガー機構とを含み、
前記第1のトリガー機構は、5分後ないし60分後の第1の解放時間を有し、前記第1のトリガー機構の解放後は、前記超吸水性ポリマー組成物が、修正された遠心保持容量(mCRC)試験で測定して前記第1の総吸収容量よりも少なくとも25%大きい第2の総吸収容量を有し、
前記第2のトリガー機構は、10分後ないし120分後であり且つ前記第1の解放時間の少なくとも5分後の第2の解放時間を有し、前記第2のトリガー機構の解放後は、前記超吸水性ポリマー組成物が、前記mCRC試験で測定して前記第2の総吸収容量よりも少なくとも25%大きい第3の総吸収容量を有することを特徴とする吸収性組成物。 - 請求項1に記載の吸収性組成物であって、
前記トリガー機構は、15分後ないし180分後であり且つ前記第2の解放時間の少なくとも5分後の第3の解放時間を有する第3のトリガー機構をさらに含み、
前記第3のトリガー機構の解放後は、前記超吸水性ポリマー組成物が、前記mCRC試験で測定して前記第3の総吸収容量よりも少なくとも25%大きい第4の総吸収容量を有することを特徴とする吸収性組成物。 - 請求項2に記載の吸収性組成物であって、
前記トリガー機構は、20分後ないし240分後であり且つ前記第3の解放時間の少なくとも5分後の第4の解放時間を有する第4のトリガー機構をさらに含み、
前記第4のトリガー機構の解放後は、前記超吸水性ポリマー組成物が、前記mCRC試験で測定して前記第4の総吸収容量よりも少なくとも25%大きい第5の総吸収容量を有することを特徴とする吸収性組成物。 - 請求項1に記載の吸収性組成物であって、
前記超吸水性ポリマー組成物が、膨潤率試験で測定して従来の超吸水性材料の膨潤率よりも少なくとも20%大きい膨潤率を有することを特徴とする吸収性組成物。 - 請求項4に記載の吸収性組成物であって、
前記超吸水性ポリマー組成物が、膨潤率試験で測定して従来の超吸水性材料の膨潤率よりも少なくとも50%大きい膨潤率を有することを特徴とする吸収性組成物。 - 請求項5に記載の吸収性組成物であって、
前記超吸水性ポリマー組成物が、膨潤率試験で測定して従来の超吸水性材料の膨潤率よりも少なくとも100%大きい膨潤率を有することを特徴とする吸収性組成物。 - 吸収性複合材料であって、
不水溶性の繊維性マトリックスと、
少なくとも5g食塩水/1g組成物の第1の総吸収容量を有する超吸水性ポリマー組成物と、
カプセルに含まれ該カプセルが液体により溶解することにより放出され、吸収性複合材料が流体と接触した後から各々が前記カプセルの溶解速度により決定される所定の解放時間後に前記超吸水性ポリマー組成物の吸収容量に影響を与え始める物質である、複数のトリガー機構として、第1のトリガー機構及び第2のトリガー機構とを含み、
前記第1のトリガー機構は、5分後ないし60分後の第1の解放時間を有し、前記第1のトリガー機構の解放後は、前記超吸水性ポリマー組成物が、修正された遠心保持容量(mCRC)試験で測定して前記第1の総吸収容量よりも少なくとも25%大きい第2の総吸収容量を有し、
前記第2のトリガー機構は、10分後ないし120分後であり且つ前記第1の解放時間の少なくとも5分後の第2の解放時間を有し、前記第2のトリガー機構の解放後は、前記超吸水性ポリマー組成物が、前記mCRC試験で測定して前記第2の総吸収容量よりも少なくとも25%大きい第3の総吸収容量を有することを特徴とする吸収性複合材料。 - 請求項7に記載の吸収性複合材料であって、
前記トリガー機構は、15分後ないし180分後であり且つ前記第2の解放時間の少なくとも5分後の第3の解放時間を有する第3のトリガー機構をさらに含み、
前記第3のトリガー機構の解放後は、前記超吸水性ポリマー組成物が、前記mCRC試験で測定して前記第3の総吸収容量よりも少なくとも25%大きい第4の総吸収容量を有することを特徴とする吸収性複合材料。 - 請求項8に記載の吸収性複合材料であって、
前記トリガー機構は、20分後ないし240分後であり且つ前記第3の解放時間の少なくとも5分後の第4の解放時間を有する第4のトリガー機構をさらに含み、
前記第4のトリガー機構の解放後は、前記超吸水性ポリマー組成物が、前記mCRC試験で測定して前記第4の総吸収容量よりも少なくとも25%大きい第5の総吸収容量を有することを特徴とする吸収性複合材料。 - 請求項7に記載の吸収性複合材料であって、
前記超吸水性ポリマー組成物が、膨潤率試験で測定して従来の超吸水性材料の膨潤率よりも少なくとも20%大きい膨潤率を有することを特徴とする吸収性複合材料。 - 請求項10に記載の吸収性複合材料であって、
前記超吸水性ポリマー組成物が、膨潤率試験で測定して従来の超吸水性材料の膨潤率よりも少なくとも50%大きい膨潤率を有することを特徴とする吸収性複合材料。 - 請求項11に記載の吸収性複合材料であって、
前記超吸水性ポリマー組成物が、膨潤率試験で測定して従来の超吸水性材料の膨潤率よりも少なくとも100%大きい膨潤率を有することを特徴とする吸収性複合材料。 - 吸収性物品であって、
少なくとも5g食塩水/1g組成物の第1の総吸収容量を有する超吸水性ポリマー組成物を含有する吸収性コアと、
カプセルに含まれ該カプセルが液体により溶解することにより放出され、吸収性コアが流体と接触した後から各々が前記カプセルの溶解速度により決定される所定の解放時間後に前記超吸水性ポリマー組成物の吸収容量に影響を与え始める物質である、複数のトリガー機構として、第1のトリガー機構及び第2のトリガー機構とを含み、
前記第1のトリガー機構は、5分後ないし60分後の第1の解放時間を有し、前記第1のトリガー機構の解放後は、前記超吸水性ポリマー組成物が、修正された遠心保持容量(mCRC)試験で測定して前記第1の総吸収容量よりも少なくとも25%大きい第2の総吸収容量を有し、
前記第2のトリガー機構は、10分後ないし120分後であり且つ前記第1の解放時間の少なくとも5分後の第2の解放時間を有し、前記第2のトリガー機構の解放後は、前記超吸水性ポリマー組成物が、前記mCRC試験で測定して前記第2の総吸収容量よりも少なくとも25%大きい第3の総吸収容量を有することを特徴とする吸収性物品。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/796,585 | 2007-04-28 | ||
US11/796,585 US8383877B2 (en) | 2007-04-28 | 2007-04-28 | Absorbent composites exhibiting stepped capacity behavior |
PCT/IB2008/050784 WO2008132617A1 (en) | 2007-04-28 | 2008-03-04 | Absorbent composites exhibiting stepped capacity behavior |
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JP2010525135A JP2010525135A (ja) | 2010-07-22 |
JP2010525135A5 JP2010525135A5 (ja) | 2014-01-09 |
JP5431307B2 true JP5431307B2 (ja) | 2014-03-05 |
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EP (1) | EP2142156A1 (ja) |
JP (1) | JP5431307B2 (ja) |
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AU (1) | AU2008243891B2 (ja) |
BR (1) | BRPI0809839B8 (ja) |
MX (1) | MX2009011694A (ja) |
WO (1) | WO2008132617A1 (ja) |
ZA (1) | ZA200906656B (ja) |
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-
2007
- 2007-04-28 US US11/796,585 patent/US8383877B2/en active Active
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2008
- 2008-03-04 JP JP2010504917A patent/JP5431307B2/ja not_active Expired - Fee Related
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- 2008-03-04 KR KR1020097022421A patent/KR101479794B1/ko active IP Right Grant
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BRPI0809839A2 (pt) | 2014-09-23 |
US20130150817A1 (en) | 2013-06-13 |
EP2142156A1 (en) | 2010-01-13 |
US20080269705A1 (en) | 2008-10-30 |
JP2010525135A (ja) | 2010-07-22 |
KR101479794B1 (ko) | 2015-01-06 |
BRPI0809839B8 (pt) | 2021-06-22 |
AU2008243891A1 (en) | 2008-11-06 |
US8957278B2 (en) | 2015-02-17 |
US8383877B2 (en) | 2013-02-26 |
WO2008132617A1 (en) | 2008-11-06 |
ZA200906656B (en) | 2011-02-23 |
KR20100015949A (ko) | 2010-02-12 |
AU2008243891B2 (en) | 2013-03-21 |
BRPI0809839B1 (pt) | 2019-03-26 |
MX2009011694A (es) | 2009-11-10 |
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