JP2019001071A - 積層体および皮膚貼付用シート - Google Patents
積層体および皮膚貼付用シート Download PDFInfo
- Publication number
- JP2019001071A JP2019001071A JP2017117994A JP2017117994A JP2019001071A JP 2019001071 A JP2019001071 A JP 2019001071A JP 2017117994 A JP2017117994 A JP 2017117994A JP 2017117994 A JP2017117994 A JP 2017117994A JP 2019001071 A JP2019001071 A JP 2019001071A
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- Prior art keywords
- fiber
- component
- fibers
- granular material
- skin
- 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.)
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/728—Hydrophilic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/748—Releasability
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2535/00—Medical equipment, e.g. bandage, prostheses, catheter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2555/00—Personal care
- B32B2555/02—Diapers or napkins
Abstract
【解決手段】第1の繊維を含む繊維基材層と、前記繊維基材層に積層された繊維集合体と、を備え、前記繊維集合体が、水溶性の第1成分を主成分として含む第2の繊維と、ヒドロゲルを形成し得る第2成分を含む粒状体と、を備え、前記第2の繊維が前記第2成分を含むとき、前記粒状体に含まれる前記第2成分の質量比率が、前記第2の繊維に含まれる前記第2成分の質量比率よりも大きく、前記第1の繊維の平均繊維径D1と、前記第2の繊維の平均繊維径D2とが、D1>D2の関係を満たす、積層体。
【選択図】図2
Description
本実施形態に係る積層体は、第1の繊維を含む繊維基材層と、繊維基材層に積層された繊維集合体と、を備える。繊維集合体は、水溶性の第1成分を主成分として含む第2の繊維と、ヒドロゲルを形成し得る第2成分を含む粒状体と、を備える。
繊維基材層は、繊維集合体を支持する役割を担う。繊維基材層は、第1の繊維を含んでおり、例えば、織物、編物、不織布、フェルト等の繊維構造体により構成される。このような繊維基材層は高いガス透過性(水蒸気、酸素等の気体の透過性)を有する。そのため、積層体を皮膚に接触させている間、皮膚の呼吸や汗腺の閉塞が抑制される。特に、長時間にわたって積層体を皮膚に接触させて使用する場合、繊維基材層がガス透過性を有することが重要である。また、繊維基材層は伸縮性を有するため、可動部位等への貼り付けに適している。
繊維集合体は、水溶性の第1成分を主成分として含む第2の繊維と、ヒドロゲルを形成し得る第2成分を含む粒状体とを備え、例えば、不織布状であり、綿状であり得る。繊維集合体は、水分の存在下で皮膚に作用して、第1成分および第2成分による効果を与える。
第2の繊維は、水溶性の第1成分を主成分(第2の繊維の50質量%以上を占める成分)として含む。そのため、積層体を、水分の存在下において皮膚に接触させたとき、水分によって第1成分(第2の繊維の一部または全部)が溶解して、皮膚に作用する。さらに、第1成分が溶解することにより、第2成分を含む粒状体を、皮膚に接触させることができる。なお、第2の繊維には、第1成分とともに、第2成分および/または第3成分が含まれ得る。
粒状体は、ヒドロゲルを形成し得る第2成分を含む。そのため、水分の存在下で積層体を皮膚に接触させたとき、ヒドロゲルを含む粒状体は皮膚に密着して、皮膚に直接的に作用し得る。この点を考慮すると、粒状体は、第2成分とともに水を含んでいることが好ましい。積層体を皮膚に接触させたとき、水分を供給することなく、粒状体を皮膚に密着できるためである。さらに、粒状体は保水性を備えるため、長時間にわたって皮膚の乾燥を抑制することができる。なお、積層体を皮膚に接触させた後、水分を供給してもよいことは上記の通りである。この場合、粒状体は、供給された水分を取り込み保持することができる。
例えば、繊維基材層に含まれる第1の繊維の平均繊維径D1が過度に大きい場合、繊維集合体と繊維基材層との間に、平均繊維径D1よりも小さく、平均繊維径D2よりも大きな平均繊維径を有する繊維で構成される第3の層(中間層)を配してもよい。中間層の材質は特に限定されず、繊維基材層と同様であってもよい。
以下、積層体の製造方法を、図面を参照しながら具体的に説明するが、積層体の製造方法はこれに限定されるものではない。図1は、繊維集合体の製造に用いられる電界紡糸装置の構成例を示す側面図である。なお、繊維基材層を電界紡糸法により製造する場合にも、同様の構成を備える装置を使用することができる。
まず、第1成分と第2成分と水とを含む原料液20を調製する。原料液20において、第1成分は溶解しており、第2成分は溶解しているか、あるいは、分散している。
電界紡糸に用いられる電界紡糸装置10は、例えば、原料液20を放出するための放出体11と、放出された原料液20をプラスに帯電させる帯電手段と、ターゲット12を支持するコンベアベルト13と、を備えている。コンベアベルト13は、ターゲット12とともに、繊維集合体を収集するコレクタ部として機能する。
(1)原料液の調製
超純水に、ヒアルロン酸ナトリウム(ヒアルロン酸Na)を1.5質量%、コラーゲンペプチド(酵素分解コラーゲンペプチド、平均分子量2,000)を10質量%となるように混合して溶解させることにより、原料液(せん断速度1s−1における粘度:10.5Pa・S)を得た。
得られた原料液を、印加電圧45kVの条件で、不織布上に電界紡糸して積層体を得た。不織布上に形成された繊維集合体は、平均繊維径D2が60nmの第2の繊維と、平均粒径D3が約2.5μmの粒状体と、を備えていた。不織布は、厚み:60μm、単位面積当たりの質量:9.4g/m2であり、第1繊維は、平均繊維径D1:550nmであり、ポリウレタンを50質量%、ポリエーテルサルフォンを50質量%含んでいた。
繊維集合体に含まれる成分を算定するため、上記(2)と同じ紡糸条件で、別途、繊維集合体を作製した。得られた繊維集合体全体の赤外吸光スペクトルを、顕微赤外吸光測定装置(ThermoFisher Scientific社製、Nicolet6700)を用いてKBr法により取得した(図3)。また、繊維集合体から、マニュピレータ(マイクロサポート社製、AXIS-PRO)を用いて粒子径2μmの粒状体を3粒取り出し、KBr板状に配置した後、同様にして赤外吸光スペクトルを取得した(図4)。
繊維基材層として医療用サージカルテープ(3M社製、商品名マイクロポア、レーヨン不織布、平均繊維径D1:20μm)を用いたこと以外は、実施例1と同様にして積層体を得た。医療用サージカルテープ上に形成された繊維集合体は、平均繊維径D2が60nmの第2の繊維と、平均粒径D3が約1μmの粒状体と、を備えていた。
リン酸緩衝液(pH7.4、10mM)に、ヒアルロン酸Naを1.5質量%、コラーゲンペプチドを10質量%となるように混合して溶解させたこと以外、実施例1と同様にして原料液(せん断速度1s−1における粘度:13.1Pa・S)を調製し、実施例2と同じ医療用サージカルテープ上に繊維集合体を形成して、積層体を得た。医療用サージカルテープ上に形成された繊維集合体は、平均繊維径D2が60nmの第2の繊維と、平均粒径D3が約1μmの粒状体と、を備えていた。リン酸緩衝液は、所定量のpH調整剤(リン酸二水素ナトリウム2水和物およびリン酸水素二ナトリウム)を、超純水に溶解することにより調製した。
11:放出体
12:ターゲット
13:コンベアベルト
14:電圧印加装置
15:対電極
16:第1支持体
17:第2支持体
18:パイプ
20:原料液
(1)原料液の調製
超純水に、ヒアルロン酸ナトリウム(ヒアルロン酸Na)を1.5質量%、コラーゲンペプチド(酵素分解コラーゲンペプチド、平均分子量2,000)を10質量%となるように混合して溶解させることにより、原料液(せん断速度1s−1における粘度:10.5Pa・s)を得た。
繊維集合体に含まれる成分を算定するため、上記(2)と同じ紡糸条件で、別途、繊維集合体を作製した。得られた繊維集合体全体の赤外吸光スペクトルを、顕微赤外吸光測定装置(ThermoFisher Scientific社製、Nicolet6700)を用いてKBr法により取得した(図3)。また、繊維集合体から、マニュピレータ(マイクロサポート社製、AXIS-PRO)を用いて粒子径2μmの粒状体を3粒取り出し、KBr板上に配置した後、同様にして赤外吸光スペクトルを取得した(図4)。
リン酸緩衝液(pH7.4、10mM)に、ヒアルロン酸Naを1.5質量%、コラーゲンペプチドを10質量%となるように混合して溶解させたこと以外、実施例1と同様にして原料液(せん断速度1s−1における粘度:13.1Pa・s)を調製し、実施例2と同じ医療用サージカルテープ上に繊維集合体を形成して、積層体を得た。医療用サージカルテープ上に形成された繊維集合体は、平均繊維径D2が60nmの第2の繊維と、平均粒径D3が約1μmの粒状体と、を備えていた。リン酸緩衝液は、所定量のpH調整剤(リン酸二水素ナトリウム2水和物およびリン酸水素二ナトリウム)を、超純水に溶解することにより調製した。
Claims (10)
- 第1の繊維を含む繊維基材層と、前記繊維基材層に積層された繊維集合体と、を備え、
前記繊維集合体が、
水溶性の第1成分を主成分として含む第2の繊維と、
ヒドロゲルを形成し得る第2成分を含む粒状体と、を備え、
前記第2の繊維が前記第2成分を含むとき、
前記粒状体に含まれる前記第2成分の質量比率が、前記第2の繊維に含まれる前記第2成分の質量比率よりも大きく、
前記第1の繊維の平均繊維径D1と、前記第2の繊維の平均繊維径D2とが、
D1>D2の関係を満たす、積層体。 - 前記第2の繊維の前記平均繊維径D2と、前記粒状体の平均粒径D3とが、
D2<D3の関係を満たす、請求項1に記載の積層体。 - 前記第1の繊維の前記平均繊維径D1と、前記粒状体の前記平均粒径D3とが、
D1<D3の関係を満たす、請求項2に記載の積層体。 - 少なくとも一部の前記粒状体が、前記第2の繊維で支持されている、請求項1〜3のいずれか一項に記載の積層体。
- 前記第2の繊維の前記平均繊維径D2が500nm以下である、請求項1〜4のいずれか一項に記載の積層体。
- 前記粒状体の平均粒径D3が0.2μm以上である、請求項1〜5のいずれか一項に記載の積層体。
- 請求項1〜6のいずれか一項に記載の積層体を備える、皮膚貼付用シート。
- 前記第1成分が、コラーゲン類である、請求項7に記載の皮膚貼付用シート。
- 前記第2成分が、ヒアルロン酸塩、ヒアルロン酸誘導体、水溶性アルギン酸塩およびアルギン酸誘導体よりなる群から選択される少なくとも1つである、請求項7に記載の皮膚貼付用シート。
- 前記第1成分が、コラーゲン類であり、
前記第2成分が、ヒアルロン酸塩、ヒアルロン酸誘導体、水溶性アルギン酸塩およびアルギン酸誘導体よりなる群から選択される少なくとも1つであり、
前記繊維および前記粒状体の少なくとも一方が、前記第1成分および前記第2成分以外の第3成分をさらに含む、請求項7に記載の皮膚貼付用シート。
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