JP7265835B2 - 吸収性物品及び製造方法 - Google Patents
吸収性物品及び製造方法 Download PDFInfo
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- JP7265835B2 JP7265835B2 JP2016574442A JP2016574442A JP7265835B2 JP 7265835 B2 JP7265835 B2 JP 7265835B2 JP 2016574442 A JP2016574442 A JP 2016574442A JP 2016574442 A JP2016574442 A JP 2016574442A JP 7265835 B2 JP7265835 B2 JP 7265835B2
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- monomer
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- absorbent article
- copolymer
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Images
Classifications
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Landscapes
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- Absorbent Articles And Supports Therefor (AREA)
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- Laminated Bodies (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Graft Or Block Polymers (AREA)
Description
コアを形成するために基材に結合されるコポリマーを含む吸収性物品、及びパーソナルケア製品に有用なかかる物品の製造方法を記載する。
体液を吸収させるためのパーソナルケア製品が知られている。このような製品としては、成人用失禁製品、おむつ、トレーニングパンツ、女性用ケア製品、及び創傷ドレッシングなどが挙げられる。従来、このようなパーソナルケア製品は、概して、ある程度のセルロース繊維(例えば、木材パルプフラッフなど)を含む。木材パルプフラッフは、体液用に好適な吸収剤であることが知られている。一般に、1グラムの木材パルプフラッフは、尿などの排泄された体液を約5~約8グラム吸収することができる。乳幼児用おむつなどのパーソナルケア製品は、概して、少なくとも約200~400グラムの尿を吸収する能力を有する。したがって、かかる乳幼児用おむつを木材パルプフラッフから形成するときには、相対的に多量の木材パルプフラッフを使用しなければならない。
高い吸収能及び速い吸収速度を有する吸収性物品が求められている。高い吸収能を備える薄型吸収性物品を提供することが求められている。速い吸収速度を損なわずに、吸収性物品の吸収能を所望の最終用途のため、容易に制御又は調整できるものであることもまた求められている。ロール・トゥ・ロールプロセスに適している簡易なプロセスを提供すること、並びにひいては製造を容易にすること、が必要とされている。
本明細書で使用する場合、用語
「a」、「an」、及び「the」は、互換的に使用され、1つ又は2つ以上を意味する。
「及び/又は」は、記載された場合の1つ若しくは両方が起こる可能性があることを示すために用いられ、例えば、A及び/又はBとは、(A及びB)並びに(A又はB)を含む。
「(メタ)アクリレート」は、アクリレート(CH2=CHCO-)構造若しくはメタクリレート(CH2=CCH3CO-)構造のいずれか、又はその組合せを含む化合物を指す。
Ar-CO-R13
のものが挙げられる[式中、Arは、C1~C12アルキル基、C1~C12アルコキシ基、又はフェニル基で任意選択的に置換されていてもよい6~12個の炭素原子を有する置換又は非置換アリール基であり、R13は、C1~C6アルキル基、3~14個の炭素原子を有するシクロアルキル基、又はArである。]。例示的なII型開始剤としては、ベンゾフェノン、4-(3-スルホプロピルオキシ)ベンゾフェノンナトリウム塩、ミヒラーケトン、ベンジル、アントラキノン、5,12-ナフタセンキノン、アセアントラセンキノン、ベンズ(A)アントラセン-7,12-ジオン、1,4-クリセンキノン、6,13-ペンタセンキノン、5,7,12,14-ペンタセンテトロン、9-フルオレノン、アントロン、キサントン、チオキサントン、2-(3-スルホプロピルオキシ)チオキサンテン-9-オン、アクリドン、ジベンゾスベロン、アセトフェノン、及びクロモンが挙げられる。
かかるコポリマーが、(メタ)アクリル酸又はその塩から選択される第1のモノマー、親水性である第2のモノマー、及び親水性架橋モノマーである1重量%超の第3のモノマー、から誘導され、
コアにおける酸性官能基のうち、少なくとも50%が塩形成カチオンにより中和されている、吸収性物品。
(b)コアを形成する第1の基材にコポリマーを不可逆的に結合させるため、重合性溶液を重合させることと、を含み、
コアにおける酸性官能基のうち、少なくとも50%が塩形成カチオンにより中和されている、吸収性物品の製造方法。
Ax=(Ww-Wd)/Wd
式中、Wwは円形試験片の湿式重量であり、Wdは円形試験片の乾式重量である。3片の測定結果を平均したものを結果として記録する。
水素化ナトリウム(6グラムの60重量%鉱油分散体)を500mLの丸底フラスコに量り取った。石油エーテル(15mL)を添加し、撹拌し、鉱油に溶解させた。この液体をデカントした。石油エーテルによる洗浄を更に2回繰り返し、洗浄毎にデカントを行った。次に、フラスコにテトラヒドロフラン(200mL)を添加した。ガスの発生速度を調節するため、約10分以上かけて固体4-ヒドロキシベンゾフェノン(19.8グラム)を少量ずつ添加した。得られた黄色混合物を30分間撹拌し、プロパンスルトン(13.4グラム、Alfa Aesar,Ward Hill,MA)を加えて30分間撹拌した後、終夜還流した。混合物を室温まで放冷し、イソプロパノール(15mL)を添加して30分撹拌し、固体を濾過し、窒素気流下で乾燥して、オフホワイト色の固体として所望の生成物を得た(33.8グラム)。以下の調製例に使用するため、0.1グラム/mLの脱イオン水溶液を調製した。
ポリアミドを、ポリプロピレンスパンボンドメルトブロースパンボンド(SMS)不織布ウェブ(50gsm、商品名「4148 KIARA FILTRATION MEDIA」で入手可能、20% 4-ポイントスクエアボンド(矩形4点接着)(4-point square bond)、PGI Polymers Inc.,Mooresville,NCから入手可能)に置き換えたことを除き、比較例C1の手順に従って同様に行なった。0.5% MBAを含む、比較例C1に記載の重合性溶液を使用した。上記の液体吸収量についての試験方法に従い、脱イオン水及び0.9重量%食塩水溶液の吸収量を測定した。結果を表2に示す。
ポリアミドを、2種類の異なるポリプロピレン不織布:
(1)白色PP:12~15gsmの白色スパンボンド材料、及び
(2)青色PP:坪量18gsmの熱接着した青色材料(Shalag Industries,Ltd.(Oxford,NC)から、商品番号SH-PPL-18Bで入手可能)で置き換えたことを除き、比較例C1の手順に従って同様に行なった。
2-ヒドロキシエチルメタクリレート(HEMA、アクリル酸の重量に対し20重量%)を、比較例C1のとおりに調製した中和したアクリル酸溶液に添加し、エタノール/脱イオン水の1:1体積/体積混合物により希釈して、最終的に総モノマー溶液の20重量%を維持して重合性溶液を調製した。S-BPを添加し、MBAの量を変えて、比較例C1に記載のとおりに重合性溶液(各5g)を調製し、総モノマー重量に対し様々な量の架橋剤を提供した。これらの重合性溶液を青色PP(2層)上に被覆し、グラフト化させた。被覆プロセスは、余分な重合性溶液の除去に2.28kgの荷重を使用しなかった点において、比較例C1における記載からわずかに変更した。その代わりに、上側PETフィルムを接着剤により下側のPETフィルムに結合させて、被覆した基材上にそっと載せた。上側PETの重量は、余分な重合性溶液を絞り出すのに実質的に十分なものであった。次に、グラフト化材料を洗浄し、乾燥し、水及び食塩水の吸収について(吸収速度及び量の両方を)評価した。グラフト化複合体を、適した洗浄液(0.9%食塩水又は脱イオン水、基材片毎に500mLの液体)に30分間浸漬し、時折静かに撹拌して、洗浄を達成した。前述と同じ手順で洗浄を3回行った。結果は、表4に示すとおりである。結果は、第2のモノマーを併用することと、架橋密度を増加させることとの組み合わせにより、吸収速度を増加可能であることを示す。この結果は、吸収される流体の量をほとんど低下させずに、又は全く低下させずに達成される。
HEMAの代わりにN,N-ジメチルアクリルアミド(DMA)を使用したことを除き、実施例1に記載のとおりに、様々な量のMBAを含む重合性溶液を調製した。上記実施例1のとおりに試料を被覆し、グラフト化し、洗浄し、乾燥し、液体吸収量の試験方法に従い脱イオン水の吸収について試験した。結果は、表5に示すとおりである。
様々な第2のモノマーを使用し、架橋剤としてのポリエチレングリコールジアクリレート(PEGDA,MW 575,Sigma-Aldrich(Milwaukee,WI))の量は変えて、重合性溶液を調製した。モノマー原液を以下に一覧とする原材料と混合することにより、溶液を調製した。実施例3、4、5、及び7は、すべてアクリル酸の総重量に対し20重量%の第2のモノマーを含有する。実施例4~7は、それぞれ架橋剤モル当量の0.5%のMBAを含有するのに対し、実施例3は、架橋剤モル当量の3%のMBAを含有する。
重合性溶液を、前述のとおりモノマー原液、S-BPを2-アクリルアミド-2-メチル-1-プロパンスルホン酸ナトリウム塩(AMPS-Na、水中50重量%、Lubrizol,Wickliffe,OH)と一緒にしたものと、アクリル酸に対し0.5重量%のMBAと、により調製した。アクリル酸の量に対し5重量%、7.5重量%、及び10重量%のAMPS-Naを添加した。実施例1に記載のとおりに青色PP(2層)を被覆し、グラフト化し、洗浄し、乾燥し、上記の液体吸収量の試験方法に従い脱イオン水及び食塩水の吸収について試験した。結果は、表7に示すとおりである。
メチレンビスアクリルアミド(MBA、0.48グラム)をモノマー原液に添加し、アクリル酸に対し4重量%の架橋剤を提供し、第1の溶液を準備した。
実施例1に記載のものと同様の手順により、アクリルアミド及びアクリル酸(75%中和)を様々な比で含有する重合性溶液を調製した。アクリルアミドの使用量は、モノマーの総重量に対し2重量%、5重量%、10重量%、及び20重量%とした。重合性溶液は、モノマーの総含有量に対し2重量%のMBAを含有するよう処方し、比較例C1に記載のとおりS-BPを添加した。実施例1に記載のとおりに青色PP(2層)を被覆し、グラフト化し、洗浄し、乾燥し、評価した。全部で4種の試料(2%、5%、10%及び20%のアクリルアミド)は、グラフト化複合体のg当たり20~30グラムの脱イオン水を吸収したものの、すべてが、120秒超の吸収時間を示した。
S-BPを使用し、実施例1と同様にして、20重量%のHEMA及び80重量%のアクリル酸(75%中和)と、5%又は10% MBA(対モノマーの総重量)のいずれか、及び様々な量のポリエチレングリコール6000(PEG 6000)とを含む重合性溶液を調製した。実施例1に記載のとおりに青色PP(2層)を被覆し、グラフト化し、洗浄し、乾燥し、評価した。5% MBAを使用することにより得られた結果を表9に示し、10% MBAを使用することにより得られた結果を表10に示す。
Claims (8)
- 第1の基材と、コアを形成するために前記第1の基材に不可逆的に結合されるコポリマーと、を含み、
前記コポリマーが、(メタ)アクリル酸又はその塩から選択される第1のモノマー、親水性である第2のモノマー、及び親水性架橋モノマーである1重量%超の第3のモノマー、から誘導され、
前記コアが酸性官能基を含み、前記酸性官能基のうち、少なくとも50%が塩形成カチオンにより中和されており、
前記コアは、以下の条件(A)及び(B)の少なくとも一つを満たし、
前記コポリマーはイタコナミン酸又はイタコナミン酸塩から誘導される繰り返し単位を含まない、吸収性物品。
条件(A):前記コアが超吸収ポリマーの粒子を含まない。
条件(B):前記コアがセルロース系ナノフィブリルを含まない。 - 前記第2のモノマーが、2-ヒドロキシエチルメタクリレート、2-ヒドロキシプロピル(メタ)アクリレート、3-ヒドロキシプロピル(メタ)アクリレート、N,N-ジメチルアクリルアミド、及びアクリルアミドのうち、少なくとも1つから選択される、請求項1に記載の吸収性物品。
- 前記第3のモノマーが、メチレンビスアクリルアミド及びポリエチレングリコールジアクリレートのうち、少なくとも1つから選択される、請求項1に記載の吸収性物品。
- 液体透過層である第2の層を更に含む、請求項1に記載の吸収性物品。
- 液体不透過層である第3の層を更に含み、前記第2の層と前記第3の層との間に前記コアが挟み込まれている、請求項4に記載の吸収性物品。
- 前記吸収性物品が、おむつ、女性用衛生パッド、動物用衛生パッド、創傷ケア物品、及び化学的吸収パッドから選択される、請求項1に記載の吸収性物品。
- 前記コポリマーが、更にII型光開始剤から誘導される、請求項1~6のいずれか一項に記載の吸収性物品。
- (a)(i)(メタ)アクリル酸又はその塩から選択される第1のモノマー、(ii)親水性である第2のモノマー及び(iii)親水性架橋モノマーである1重量%超の第3のモノマーを含む重合性溶液を、第1の基材に接触させることと、
(b)コアを形成する前記第1の基材にコポリマーを不可逆的に結合させるため、前記重合性溶液を重合させることと、を含み、
前記コアが酸性官能基を含み、前記酸性官能基のうち、少なくとも50%が塩形成カチオンにより中和されており、
前記コアが、以下の条件(A)及び(B)の少なくとも一つを満たし、
前記コポリマーはイタコナミン酸又はイタコナミン酸塩から誘導される繰り返し単位を含まない、吸収性物品の製造方法。
条件(A):前記コアが超吸収ポリマーの粒子を含まない。
条件(B):前記コアがセルロース系ナノフィブリルを含まない。
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CN106470654A (zh) | 2017-03-01 |
EP3160412B1 (en) | 2021-05-05 |
EP3160412A4 (en) | 2018-02-28 |
US11076999B2 (en) | 2021-08-03 |
WO2015200131A8 (en) | 2016-12-29 |
US20170112685A1 (en) | 2017-04-27 |
WO2015200131A1 (en) | 2015-12-30 |
JP2017522946A (ja) | 2017-08-17 |
EP3160412A1 (en) | 2017-05-03 |
CN106470654B (zh) | 2020-08-25 |
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