JP5889618B2 - Absorbent article and method for evaluating skin care effect of absorbent article - Google Patents
Absorbent article and method for evaluating skin care effect of absorbent article Download PDFInfo
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- JP5889618B2 JP5889618B2 JP2011262634A JP2011262634A JP5889618B2 JP 5889618 B2 JP5889618 B2 JP 5889618B2 JP 2011262634 A JP2011262634 A JP 2011262634A JP 2011262634 A JP2011262634 A JP 2011262634A JP 5889618 B2 JP5889618 B2 JP 5889618B2
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Images
Landscapes
- Absorbent Articles And Supports Therefor (AREA)
Description
本発明は、使い捨ておむつや生理用ナプキン等の吸収性物品に関する。また本発明は、吸収性物品のスキンケア効果の評価方法に関する。 The present invention relates to absorbent articles such as disposable diapers and sanitary napkins. The present invention also relates to a method for evaluating the skin care effect of an absorbent article.
スキンケア剤の塗布された吸収性物品が種々提案されている。例えば特許文献１には、吸収性物品のトップシートの少なくとも一部に、２０℃において半固体又は固体であり、部分的に着用者の皮膚へ移ることができる有効量のローション組成物を適用することが記載されている。ローション組成物は、（ｉ）２０℃で可塑性もしくは流動性コンシステンシーを有するエモリエント剤を１０〜９５％、および（ii）該エモリエント剤を該トップシート上に固定化し得る固定化剤であって、少なくとも３５℃の融点を有する固定化剤を５〜９０％の割合で含むものである。固定化剤としては、例えばＣ14〜Ｃ22脂肪アルコールが用いられる。
Various absorbent articles coated with a skin care agent have been proposed. For example, in
本出願人もまた、スキンケア剤の塗布された吸収性物品を提案している（特許文献２参照）。この吸収性物品においては、表面シートに水溶性スキンケア剤が存在し、該水溶性スキンケア剤上であって該水溶性スキンケア剤よりも肌側に、特定のジアミド誘導体からなる油性スキンケア剤が存在している。この吸収性物品においては、該物品を着用した初期段階では、着用者の皮膚との接触によって油性スキンケア剤が着用者の皮膚へ移行し、これによって物品と皮膚との摩擦が低減されて、摩擦によって皮膚が傷つけられることが防止される。物品の着用後においては、油性スキンケア剤の下にあった水溶性スキンケア剤が排泄を契機に着用者の皮膚へ移行してそのスキンケア効果が発現するので、尿や便との接触に起因する皮膚のカブレが抑制される。 The present applicant has also proposed an absorbent article to which a skin care agent is applied (see Patent Document 2). In this absorbent article, a water-soluble skin care agent is present on the surface sheet, and an oily skin care agent comprising a specific diamide derivative is present on the water-soluble skin care agent and closer to the skin than the water-soluble skin care agent. ing. In this absorbent article, at the initial stage of wearing the article, the oily skin care agent is transferred to the wearer's skin by contact with the wearer's skin, thereby reducing the friction between the article and the skin. Prevents the skin from being damaged. After wearing the article, the water-soluble skin care agent that was under the oily skin care agent moves to the skin of the wearer when excreted, and the skin care effect is expressed, so the skin caused by contact with urine and stool The fog is suppressed.
しかしながら、上述の各吸収性物品において、表面シート等に施されたスキンケア剤によるスキンケア効果には、なお改善の余地があった。 However, in each of the above-described absorbent articles, there is still room for improvement in the skin care effect by the skin care agent applied to the top sheet or the like.
したがって本発明の課題は、前述した従来技術が有する欠点を解消し得る吸収性物品を提供することにある。 Therefore, the subject of this invention is providing the absorbent article which can eliminate the fault which the prior art mentioned above has.
前記課題を解決すべく本発明者は鋭意検討した結果、スキンケア剤が移行する前の着用者の皮膚の濡れ性と、スキンケア剤が移行した後の着用者の皮膚の濡れ性との関係が、スキンケア効果と密接に関連していることを知見した。 As a result of diligent study to solve the above problems, the present inventors have determined that the relationship between the wettability of the wearer's skin before the skin care agent is transferred and the wettability of the wearer's skin after the skin care agent is transferred, It was found to be closely related to the skin care effect.
本発明は前記知見に基づきなされたものであり、着用時に着用者の皮膚に当接する部材にスキンケア剤を施した吸収性物品において、
前記スキンケア剤として、吸収性物品を着用して該スキンケア剤が移行した状態での着用者の皮膚に対する水の接触角が、吸収性物品を着用する前の着用者の皮膚に対する水の接触角と略同じとなるものを用いた吸収性物品を提供するものである。
The present invention has been made based on the above findings, in an absorbent article having a skin care agent applied to a member that comes into contact with the wearer's skin when worn,
As the skin care agent, the contact angle of water with the skin of the wearer in a state where the absorbent product is worn and the skin care agent has transferred is the contact angle of water with the skin of the wearer before wearing the absorbent article. The present invention provides an absorbent article using a product that is substantially the same.
また本発明は、着用時に着用者の皮膚に当接する部材にスキンケア剤を施した吸収性物品のスキンケア効果の評価方法であって、
吸収性物品を着用して前記スキンケア剤が移行した状態での着用者の皮膚に対する水の接触角と、吸収性物品を着用する前の着用者の皮膚に対する水の接触角とを比較し、その大小関係に基づきスキンケア効果を評価する、吸収性物品のスキンケア効果の評価方法を提供するものである。
Further, the present invention is a method for evaluating the skin care effect of an absorbent article in which a skin care agent is applied to a member that comes into contact with the wearer's skin when worn,
Compare the contact angle of water with the skin of the wearer in a state where the skin care agent has been transferred while wearing the absorbent article, and the contact angle of water with the skin of the wearer before wearing the absorbent article. The present invention provides a method for evaluating the skin care effect of an absorbent article, which evaluates the skin care effect based on the magnitude relationship.
本発明の吸収性物品によれば、スキンケア剤が着用者の皮膚に移行した後の状態において皮丘よりも皮溝に一層多く存在しやすくなり、スキンケア効果を効果的に発現することができる。また本発明の評価方法によれば、スキンケア剤が移行した前後での皮膚に対する水の接触角の大小関係に基づいて、吸収性物品のスキンケア効果を容易に評価することができる。 According to the absorbent article of the present invention, the skin care agent is more likely to be present in the skin groove than in the dermis in the state after being transferred to the skin of the wearer, and the skin care effect can be effectively expressed. Further, according to the evaluation method of the present invention, the skin care effect of the absorbent article can be easily evaluated based on the magnitude relationship of the water contact angle with the skin before and after the skin care agent has been transferred.
以下本発明を、その好ましい実施形態に基づき説明する。本発明の吸収性物品は、着用者の皮膚に近い側に位置し、かつ着用者の皮膚に対向する表面シートと、着用者の皮膚から遠い側に位置する裏面シートとを有している。両シートの間には、液保持性の吸収体が配置されている。必要に応じ、表面シート上の左右両側部に一対の防漏カフが配置されることもある。 Hereinafter, the present invention will be described based on preferred embodiments thereof. The absorbent article of this invention has the surface sheet which is located in the side near a wearer's skin, and opposes a wearer's skin, and the back surface sheet located in the side far from a wearer's skin. A liquid-retaining absorber is disposed between both sheets. If necessary, a pair of leak-proof cuffs may be disposed on the left and right sides of the top sheet.
表面シート及び裏面シートとしては、当該技術分野において通常用いられているものと同様のものを用いることができる。表面シートとしては、例えば液透過性を有する親水性の不織布や穿孔フィルムなどを用いることができる。これらの不織布やフィルムは一般に熱可塑性樹脂から構成されている。裏面シートとしては、例えば液不透過性のフィルムや、液難透過性の不織布などを用いることができる。液不透過性のフィルムは透湿性を有していてもよい。 As the top sheet and the back sheet, the same sheets as those usually used in the technical field can be used. As the surface sheet, for example, a hydrophilic nonwoven fabric or a perforated film having liquid permeability can be used. These nonwoven fabrics and films are generally composed of a thermoplastic resin. As the back sheet, for example, a liquid-impermeable film or a liquid-impermeable nonwoven fabric can be used. The liquid-impermeable film may have moisture permeability.
吸収体としては、フラップパルプの積繊体や、フラッフパルプと高吸収性ポリマーとの混合積繊体を用いることができる。吸収体は、物品の全域にわたって同じ厚みを有していてもよく、あるいは一部分、例えば着用者の排泄部に対向する部分が他の部分よりも厚くなっていてもよい。吸収体の坪量に関しても同様であり、物品の全域にわたって同じ坪量を有していてもよく、あるいは一部分、例えば着用者の排泄部に対向する部分が他の部分よりも高坪量になっていてもよい。 As the absorbent body, it is possible to use a laminated product of flap pulp or a mixed product of fluff pulp and superabsorbent polymer. The absorbent body may have the same thickness over the entire area of the article, or a part thereof, for example, a part facing the excretion part of the wearer may be thicker than the other part. The same applies to the basis weight of the absorbent body, which may have the same basis weight over the entire area of the article, or a part, for example, the part facing the excretion part of the wearer has a higher basis weight than the other part. It may be.
吸収性物品は、着用時に着用者の皮膚に当接する部材にスキンケア剤が施されている。スキンケア剤は、吸収性物品の着用中における着用者の皮膚のカブレ等の肌トラブルを抑制する目的で使用される。この目的のため、スキンケア剤は、着用時に着用者の皮膚に当接する部材である表面シートや防漏カフに施されることが好ましい。 In an absorbent article, a skin care agent is applied to a member that comes into contact with the wearer's skin when worn. The skin care agent is used for the purpose of suppressing skin troubles such as wear of the wearer's skin while wearing the absorbent article. For this purpose, the skin care agent is preferably applied to a surface sheet or a leak-proof cuff that is a member that comes into contact with the wearer's skin when worn.
スキンケア剤を例えば表面シートに施す場合、該スキンケア剤を該表面シートの全域にまんべんなく施すことができる。あるいは、スキンケア剤の存在域と非存在域とが形成されるように該スキンケア剤を不連続に施すことができる。後者の場合、例えばスキンケア剤の存在域と非存在域とが、所定の幅をもって吸収性物品の長手方向に延び、かつ両域が吸収性物品の幅方向に沿って交互に配置されるように、これらを形成することができる。 For example, when the skin care agent is applied to the top sheet, the skin care agent can be applied evenly over the entire surface sheet. Alternatively, the skin care agent can be applied discontinuously so as to form an existing area and a non-existing area of the skin care agent. In the latter case, for example, the presence area and non-existence area of the skin care agent extend in the longitudinal direction of the absorbent article with a predetermined width, and both areas are alternately arranged along the width direction of the absorbent article. These can be formed.
吸収性物品の表面シートや防漏カフ等に施されたスキンケア剤が、その効果を十分に発揮するためには、スキンケア剤が移行する前の着用者の皮膚の濡れ性と、スキンケア剤が移行した後の着用者の皮膚の濡れ性との関係が重要であることを本発明者は知見した。詳細には、スキンケア剤が移行する前の着用者の皮膚の濡れ性と、スキンケア剤が移行した後の着用者の皮膚の濡れ性とが略同じである場合には、該濡れ性が異なる場合に比べて、スキンケア効果が高くなることを知見した。皮膚の濡れ性は表面張力と関連するものなので、濡れ性の程度は例えば皮膚に対する水の接触角で表現することができる。そこで本発明者は、スキンケア剤の移行の前後での着用者の皮膚に対する水の接触角と、スキンケア効果との関係を種々検討した結果、スキンケア剤として、それが移行した着用者の皮膚に対する水の接触角が、吸収性物品を着用する前の着用者の皮膚に対する水の接触角と略同じになるものを用いることによって、吸収性物品のスキンケア効果を高め得ること知見した。 In order for the skin care agent applied to the surface sheet of the absorbent article, the leak-proof cuff, etc. to fully demonstrate its effects, the wettability of the wearer's skin before the skin care agent has been transferred and the skin care agent has been transferred. The present inventor has found that the relationship with the wettability of the wearer's skin is important. Specifically, when the wettability of the wearer's skin before the skin care agent is transferred and the wettability of the wearer's skin after the transfer of the skin care agent are substantially the same, the wettability is different. It was found that the skin care effect is higher than that. Since the wettability of the skin is related to the surface tension, the degree of wettability can be expressed by, for example, the contact angle of water with the skin. Therefore, as a result of various investigations on the relationship between the contact angle of water on the skin of the wearer before and after the transfer of the skin care agent and the skin care effect, the present inventor has obtained water as a skin care agent on the wearer's skin. It was found that the skin care effect of the absorbent article can be enhanced by using a contact angle of approximately the same as the contact angle of water on the skin of the wearer before wearing the absorbent article.
スキンケア剤の移行の前後での着用者の皮膚に対する水の接触角が略同じになると、スキンケア効果が高くなる理由について本発明者が検討した結果、以下のことが判明した。 As a result of investigation by the present inventor on the reason why the skin care effect is enhanced when the contact angle of water on the skin of the wearer before and after the transfer of the skin care agent becomes substantially the same, the following has been found.
ヒトの皮膚表面を拡大すると、多数の凹部が観察される。この凹部は「皮溝」と呼ばれている。一方、「皮溝」間の凸部は「皮丘」と呼ばれている。本発明者が検討したところ、排泄物が皮膚に付着することに起因するカブレ等の発生は、排泄物が皮溝に入り込んで、そこに滞留することが主たる原因であることが判明した。したがって、吸収性物品の着用状態において、排泄物が皮溝に入り込む前に、吸収性物品に施されたスキンケア剤を予め皮溝に移行させれば、排泄物が皮溝に入り込むことを阻止できると本発明者は考えた。そこで、吸収性物品に施されたスキンケア剤が着用者の皮膚に移行した後、どのような存在状態になっているかを種々調べたところ、皮膚に移行したスキンケア剤の存在状態は、皮膚の濡れ性、すなわち接触角と密接に関連していることが見いだされた。このことを図１（ａ）ないし（ｃ）に基づき説明する。 When the human skin surface is enlarged, a large number of recesses are observed. This recess is called a “skin groove”. On the other hand, the convex portion between “skin grooves” is called “skin”. As a result of investigation by the present inventor, it has been found that the occurrence of fog and the like due to the excrement adhering to the skin is mainly caused by excrement entering the skin groove and staying there. Therefore, in the wearing state of the absorbent article, if the skin care agent applied to the absorbent article is transferred to the skin groove in advance before the excrement enters the skin groove, the excrement can be prevented from entering the skin groove. The inventor thought. Therefore, after various investigations were made on the presence of the skin care agent applied to the absorbent article after the skin was transferred to the wearer's skin, the presence of the skin care agent transferred to the skin was determined to be wet with the skin. It was found to be closely related to sex, ie contact angle. This will be described with reference to FIGS.
吸収性物品を着用してスキンケア剤が移行した後の状態での着用者の皮膚に対する水との接触角をθ１とし、吸収性物品を着用する前の着用者の皮膚に対する水の接触角をθ２として説明を行う。吸収性物品を着用してスキンケア剤が皮膚に移行すると、移行の初期においては、スキンケア剤は皮膚の表面に塗り広げられた状態となっている。この状態から時間が経過すると、θ１がθ２よりも小さくなるスキンケア剤を吸収性物品に施したときには、スキンケア剤の表面張力が皮膚の表面張力よりも大きく、そのことに起因して、図１（ａ）に示すように、塗り広げられたスキンケア剤の凝集が生じる。凝集したスキンケア剤は、皮丘に集まる傾向があり、皮溝に留まりにくくなる。 The contact angle with water on the wearer's skin in a state after the absorbent article is worn and the skin care agent has been transferred is θ1, and the contact angle of water with the wearer's skin before wearing the absorbent article is θ2. Will be described. When the absorbent article is worn and the skin care agent is transferred to the skin, the skin care agent is spread on the surface of the skin in the initial stage of the transfer. When time passes from this state, when the skin care agent in which θ1 is smaller than θ2 is applied to the absorbent article, the surface tension of the skin care agent is larger than the surface tension of the skin, and as a result, FIG. As shown in a), aggregation of the spread skin care agent occurs. Agglomerated skin care agents tend to collect in the cuticle and become less likely to stay in the crevice.
逆に、θ１がθ２よりも小さくなるスキンケア剤を吸収性物品に施したときには、スキンケア剤の表面張力が皮膚の表面張力よりも小さく、そのことに起因して、スキンケア剤が皮膚に移行してから時間が経過しても、図１（ｃ）に示すように、皮膚の表面に塗り広げられたスキンケア剤の該塗り広げられた状態が維持されやすい。そのため、スキンケア剤は皮丘及び皮溝の双方に薄く存在し、皮溝に集中して分布しにくい。 On the contrary, when a skin care agent in which θ1 is smaller than θ2 is applied to the absorbent article, the surface tension of the skin care agent is smaller than the surface tension of the skin, which causes the skin care agent to move to the skin. Even when time elapses, as shown in FIG. 1C, the spread state of the skin care agent spread on the surface of the skin is easily maintained. Therefore, the skin care agent is thinly present in both the skin and the skin groove, and is difficult to concentrate and distribute in the skin groove.
これらに対して、θ１とθ２とがほぼ同じになるスキンケア剤を吸収性物品に施したときには、スキンケア剤の表面張力が皮膚の表面張力とほぼ同じであり、そのことに起因して、スキンケア剤が皮膚に移行してから時間が経過すると、皮膚の表面に塗り広げられた状態になっているスキンケア剤が、図１（ｂ）に示すように、皮溝に向けて凝集しやすくなる。その結果、皮丘に存在するスキンケア剤の量が減少し、スキンケア剤は皮溝に集中して分布するようになる。この状態が実現すると、排泄物が皮溝に入り込むことが阻止されるので、皮膚のカブレ等が起こりにくくなる。 On the other hand, when a skin care agent having substantially the same θ1 and θ2 is applied to the absorbent article, the surface tension of the skin care agent is substantially the same as the surface tension of the skin. When time elapses after the skin has moved to the skin, the skin care agent spread on the surface of the skin tends to aggregate toward the skin groove as shown in FIG. As a result, the amount of the skin care agent present in the cuticle decreases, and the skin care agent is concentrated and distributed in the skin groove. When this state is realized, the excrement is prevented from entering the skin crevice, so that the skin is less likely to be fogged.
図１（ｂ）に示すスキンケア剤の分布状態を実現するためには、上述したとおり、θ１とθ２とがほぼ同じになるスキンケア剤を選択することが重要である。つまり、表面張力が、皮膚の表面張力と同じスキンケア剤を選択することが重要である。「ほぼ同じ」とは、θ１とθ２とが同じである場合、及びθ１とθ２との差が、θ２の５％以下であることの双方を包含する。 In order to realize the distribution state of the skin care agent shown in FIG. 1B, it is important to select a skin care agent in which θ1 and θ2 are substantially the same as described above. That is, it is important to select a skin care agent having the same surface tension as that of the skin. “Substantially the same” includes both the case where θ1 and θ2 are the same, and the case where the difference between θ1 and θ2 is 5% or less of θ2.
接触角θ１は、着用時に着用者の皮膚に当接する部材として表面シートを用いた場合、例えば、以下の＜洗浄・馴化処理＞及び＜剤移行処理＞を経た皮膚について、以下の＜接触角の測定方法＞により測定できる。また、接触角θ２は、例えば、以下の＜洗浄・馴化処理＞を経た皮膚について、以下の＜接触角の測定方法＞で測定できる。以下の例では、便宜上、θ１として、実際に吸収性物品を着用した着用者の臀部等の皮膚に対する水の接触角ではなく、着用時に着用者の皮膚に当接する部材を用意し、該部材に施されたスキンケア剤を成人の前腕内側部の皮膚に移行させ、その皮膚に対する水との接触角を測定している。また、θ２として、スキンケア剤を移行させる前の成人の前腕内側部の皮膚に対する水の接触角を測定している。尤も、吸収性物品を実際に着用し、着用によってスキンケア剤を皮膚に移行させた後に、接触角を測定してもよい。その場合には、例えば着用者が乳幼児であるときは、着用者に吸収性物品を装着したのち、横に寝かせた状態で３０分経過した後に（２５℃、湿度５０％ＲＨ環境下）、接触角を測定すればよい。 When the surface sheet is used as a member that comes into contact with the wearer's skin when worn, the contact angle θ1 is, for example, the following <contact angle of the skin subjected to the following <cleaning / acclimation treatment> and <agent transfer treatment> It can measure by measuring method>. Further, the contact angle θ2 can be measured, for example, by the following <contact angle measurement method> for skin that has undergone the following <cleaning / acclimation treatment>. In the following example, for convenience, as θ1, a member that comes into contact with the skin of the wearer at the time of wearing is prepared instead of the contact angle of water on the skin of the wearer's buttocks or the like who actually wears the absorbent article. The applied skin care agent is transferred to the skin on the inner side of the adult forearm, and the contact angle with water on the skin is measured. Moreover, the contact angle of water with respect to the skin of the inner forearm of an adult before transferring the skin care agent is measured as θ2. However, the contact angle may be measured after actually wearing the absorbent article and transferring the skin care agent to the skin by wearing. In that case, for example, when the wearer is an infant, the wearer wears an absorbent article and then lies on its side for 30 minutes (25 ° C., humidity 50% RH environment) before contact. What is necessary is just to measure a corner.
＜洗浄・馴化処理＞
市販のマイルドタイプの洗顔料を泡立てて前腕をよく洗った後、水で十分にすすぐ。洗った部位の水を、日本製紙クレシア（株）製のキムタオル（登録商標）で軽くふき取る。その後、２５℃、湿度５０％ＲＨの環境可変室で１５分間馴化させる。
<Cleaning / acclimation treatment>
After washing the forearm thoroughly with foam of a commercially available mild facial cleanser, rinse thoroughly with water. The washed water is gently wiped with Kim Towel (registered trademark) manufactured by Nippon Paper Crecia Co., Ltd. Then, acclimatize for 15 minutes in an environment variable room at 25 ° C. and humidity 50% RH.
＜剤移行処理＞
吸収性物品の表面シートを、前記のように洗浄・馴化処理をした大人前腕に擦り付けてスキンケア剤を移行させる。具体的には、底面の直径が５ｃｍの円筒状の重り１（荷重４５ｇ／ｃｍ2）を用い、図２に示すとおり、該重り１の底面に、吸収性物品の表面シート２を、その外面が下方を向くように取り付け、重り１の側面において表面シート２をゴム３でくくりつけて固定する。この状態の表面シート２を、大人の前腕の内側部に当接させ、その状態下に、重り１を軸周りに一方向に回転するように、１０ｃｍの１往復の間に６回転、指で動かす。このようにして、スキンケア剤を皮膚に擦り付ける。この操作は、２５℃、湿度５０％ＲＨの環境可変室で行う。
<Agent transfer treatment>
The surface sheet of the absorbent article is rubbed against the adult forearm that has been cleaned and conditioned as described above to transfer the skin care agent. Specifically, using a
＜接触角の測定方法＞
接触角の測定には、既報（ピエールアガシェ、フィリップハンバート編メジャリングザスキン、初版、発行２００４年、発行所：シュプリンガーフェアラーク、８７〜９０頁）に従い皮膚に滴下した水滴をカメラ等で撮影し、得られた画像から形状を計測することで行う。θ１を求める場合には、＜剤移行処理＞から直後（２５℃、湿度５０％ＲＨ環境下）の前腕内側部の皮膚に、約１０μｌのイオン交換水をマイクロピペッターで滴下し、その直後に、前記方法によって接触角を測定する。測定は、＜剤移行処理＞を施した皮膚の５箇所で行い、それらの平均値を接触角とする。θ２を求める場合には、＜洗浄・馴化処理＞から直後（２５℃、湿度５０％ＲＨ環境下）の前腕内側部の皮膚に、約１０μｌのイオン交換水をマイクロピペッターで滴下し、その直後に、前記方法によって接触角を測定する。測定箇所やその数は、θ１の測定時と同様とし、θ１と同様に平均値を接触角とする。θ１及びθ２の測定温度は２５℃とする。
<Measurement method of contact angle>
For contact angle measurement, water drops dripped onto the skin were photographed with a camera or the like according to the previous report (Pierre Agache, Philippe Humbert, Measuring The Skin, first edition, issue 2004, issuer: Springer Fairlark, pages 87-90) Then, the shape is measured from the obtained image. When obtaining θ1, about 10 μl of ion-exchanged water was dropped with a micropipette on the inner skin of the forearm immediately after <agent transfer treatment> (under an environment of 25 ° C. and humidity 50% RH). The contact angle is measured by the above method. The measurement is performed at five locations on the skin subjected to <agent transfer treatment>, and the average value thereof is taken as the contact angle. When obtaining θ2, about 10 μl of ion-exchanged water is dropped with a micropipette on the inner skin of the forearm immediately after <cleaning / acclimation treatment> (under an environment of 25 ° C. and humidity 50% RH). The contact angle is measured by the above method. The measurement location and the number thereof are the same as those at the time of measuring θ1, and the average value is set as the contact angle in the same manner as θ1. The measurement temperature of θ1 and θ2 is 25 ° C.
接触角θ１は、９０度以上１００度以下であることが好ましく、９５度以上９９度以下であることが更に好ましい。θ１が９０度以上１００度であることが好ましい理由は、前記のように洗浄した後の皮膚に対する水の接触角θ２は、測定対象者が異なっても、概ね９０度以上１００度以下となるという本発明者の知見に基づいている。 The contact angle θ1 is preferably 90 degrees or greater and 100 degrees or less, and more preferably 95 degrees or greater and 99 degrees or less. The reason why θ1 is preferably 90 degrees or more and 100 degrees is that the contact angle θ2 of water on the skin after washing as described above is approximately 90 degrees or more and 100 degrees or less even if the measurement subject is different. Based on the inventor's knowledge.
皮膚に対する水の接触角が、測定対象者が異なっても概ね同じ値になることは、以下の文献にも記載されている。
“Cutaneous differences between Black, African or Caribbean Mixed-race and Caucasian women”：biometrological approach of the hydrolipidic film. Skin Research and Technology 2008; 14: 327-335
同文献によれば、アフリカ系又はカリブ系の黒人２５人、アフリカ系又はカリブ系の混血２５人及びヨーロッパ系の白人２５人の額の皮膚の接触角を測定したところ、アフリカ系又はカリブ系の黒人の接触角の平均値は７１度、アフリカ系又はカリブ系の混血の接触角の平均値は６７度、ヨーロッパ系の白人の接触角の平均値は６７度であり、人種間での違いがないことが示されている。なお、同文献に記載されている接触角と、前記「９０度以上１００度以下」の接触角とは値に差があるが、この理由は、同文献では洗浄していない皮膚の接触角を測定しているのに対して、本発明では洗浄後の皮膚の接触角を測定していることによるものと推測される。この推測は、皮膚洗浄によって、皮膚の接触角が増大するとの報告が知られている（例えばColloids and Surfactants B, 8, 1997, 147-155参照）ことから裏付けられる。
It is also described in the following literature that the contact angle of water with the skin is substantially the same value even if the measurement subject is different.
“Cutaneous differences between Black, African or Caribbean Mixed-race and Caucasian women”: biometrological approach of the hydrolipidic film. Skin Research and Technology 2008; 14: 327-335
According to this document, when the skin contact angle of 25 African or Caribbean blacks, 25 African or Caribbean mixed races and 25 European whites was measured, the African or Caribbean The average contact angle for blacks is 71 degrees, the average contact angle for African or Caribbean mixed races is 67 degrees, and the average contact angle for European Caucasians is 67 degrees. It has been shown that there is no. The contact angle described in the same document and the contact angle of “90 ° or more and 100 ° or less” have a difference in value. In contrast to the measurement, in the present invention, it is assumed that the contact angle of the skin after washing is measured. This assumption is supported by reports that skin contact increases the skin contact angle (see, for example, Colloids and Surfactants B, 8, 1997, 147-155).
以上の観点から選定される好ましいスキンケア剤としては、例えば、エモリエント剤及びその固定化剤を含むものが挙げられる。エモリエント剤とは、例えば肌を軟化あるいは柔軟にしたり、肌を潤滑させたり、肌に湿気を付与したり、肌を保湿したり、肌を清浄にしたりするなどの肌の健康状態を向上させる働きを有する物質全般を包含する。とりわけ、スキンケア効果が特に高い点から、下記式（Ｉ）で表されるアミド誘導体をエモリエント剤として用いることが好ましい。 Examples of preferable skin care agents selected from the above viewpoint include those containing an emollient agent and its immobilizing agent. Emollients improve skin health by, for example, softening or softening the skin, lubricating the skin, applying moisture to the skin, moisturizing the skin, and purifying the skin. In general, substances having In particular, an amide derivative represented by the following formula (I) is preferably used as an emollient because the skin care effect is particularly high.
式（Ｉ）で表されるアミド誘導体は、主に、吸収性物品の着用開始によって着用者の皮膚に移行して排泄物が着用者の皮膚に直接触れるのを抑制することができる。これによって排泄物の皮膚への浸透が抑制してカブレの発生を抑制しやすい。また、皮膚と吸収性物品との摩擦を弱め、吸収性物品による皮膚への刺激や肌の傷つきを低減させるとともに、経皮吸収された後には皮膚を柔軟化し、あるいは皮膚のバリア機能を高めるという働きも有する。 The amide derivative represented by the formula (I) can mainly suppress the excrement from directly touching the wearer's skin by transferring to the wearer's skin when the absorbent article starts to be worn. As a result, the penetration of excrement into the skin is suppressed, and the occurrence of fog is easily suppressed. It also reduces friction between the skin and the absorbent article, reduces skin irritation and skin damage caused by the absorbent article, and softens the skin after percutaneous absorption or enhances the barrier function of the skin. It also has a function.
式（Ｉ）で表されるアミド誘導体からなるエモリエント剤の固定化剤は、吸収性物品における着用者の肌に当接する部材、例えば表面シートや防漏カフに施されたエモリエント剤を、該部材に固定する目的で用いられる。この目的のために固定化剤は油性の物質であることが好ましい。そのような物質としては、例えば炭素数１４〜２２の脂肪族モノアルコール、炭素数１２〜２２の脂肪族モノカルボン酸、該カルボン酸と炭素数１４〜２２の脂肪族モノアルコールとのエステルなどが知られている。本発明者ら検討した結果、これらの物質のうち、炭素数１４〜２２の脂肪族モノアルコールを固定化剤として用いると、式（Ｉ）で表されるアミド誘導体に起因するべたつき感の発生を効果的に低減できることが判明した。また、式（Ｉ）で表されるアミド誘導体の固定化効果が特に高くなることも判明した。 The emollient fixing agent comprising the amide derivative represented by the formula (I) is a member that comes into contact with the wearer's skin in an absorbent article, for example, an emollient applied to a surface sheet or a leak-proof cuff. It is used for the purpose of fixing to. For this purpose, the fixing agent is preferably an oily substance. Examples of such substances include aliphatic monoalcohols having 14 to 22 carbon atoms, aliphatic monocarboxylic acids having 12 to 22 carbon atoms, and esters of the carboxylic acids with aliphatic monoalcohols having 14 to 22 carbon atoms. Are known. As a result of the study by the present inventors, among these substances, when an aliphatic monoalcohol having 14 to 22 carbon atoms is used as a fixing agent, stickiness caused by the amide derivative represented by the formula (I) is generated. It has been found that it can be effectively reduced. It has also been found that the immobilization effect of the amide derivative represented by the formula (I) is particularly high.
固定化剤として用いられる炭素数１４〜２２の脂肪族モノアルコールとしては、例えばラウリルアルコール、ミリスチルアルコール、セチルアルコール及びステアリルアルコールなどの飽和脂肪族モノアルコールや、オレイルアルコール及びリノリルアルコールなどの不飽和脂肪族モノアルコールなどを用いることができる。これらのアルコールは単独で又は２種以上を組み合わせて用いることができる。飽和脂肪族モノアルコール及び不飽和脂肪族モノアルコールのうち、飽和脂肪族モノアルコールを用いることが、式（Ｉ）で表されるアミド誘導体に起因するべたつき感の発生を効果的に低減できる点から好ましい。飽和脂肪族モノアルコールとしては、特にセチルアルコール及びステアリルアルコールを用いると、式（Ｉ）で表されるアミド誘導体に起因するべたつき感の発生を一層効果的に低減できる。とりわけステアリルアルコールを用いることが有利である。 Examples of the aliphatic monoalcohol having 14 to 22 carbon atoms used as a fixing agent include unsaturated aliphatic monoalcohols such as lauryl alcohol, myristyl alcohol, cetyl alcohol and stearyl alcohol, and unsaturateds such as oleyl alcohol and linolyl alcohol. An aliphatic monoalcohol can be used. These alcohols can be used alone or in combination of two or more. Among saturated aliphatic monoalcohols and unsaturated aliphatic monoalcohols, the use of saturated aliphatic monoalcohols can effectively reduce the occurrence of stickiness caused by the amide derivative represented by formula (I). preferable. When cetyl alcohol and stearyl alcohol are used as the saturated aliphatic monoalcohol, the occurrence of stickiness caused by the amide derivative represented by the formula (I) can be more effectively reduced. In particular, it is advantageous to use stearyl alcohol.
また、式（Ｉ）で表されるアミド誘導体と炭素数１４〜２２の脂肪族モノアルコールとの使用の比率は、該脂肪族モノアルコールの使用量を、該アミド誘導体に対して相対的に多くすることが好ましい。特に、該アミド誘導体と該脂肪族モノアルコールとの合計質量に対して、該脂肪族モノアルコールを６０〜９０質量％、好ましくは７０〜８５質量％とすることで、べたつき感の抑制とスキンケア効果の発現とを首尾良くバランスさせることができる。 The ratio of the use of the amide derivative represented by the formula (I) and the aliphatic monoalcohol having 14 to 22 carbon atoms is such that the amount of the aliphatic monoalcohol used is relatively large relative to the amide derivative. It is preferable to do. In particular, when the aliphatic monoalcohol is 60 to 90% by mass, preferably 70 to 85% by mass with respect to the total mass of the amide derivative and the aliphatic monoalcohol, the stickiness can be suppressed and the skin care effect can be obtained. Can be well balanced with the expression of.
式（Ｉ）で表されるアミド誘導体と炭素数１４〜２２の脂肪族モノアルコールとを混合してスキンケア剤を得るためには、例えばこれらを６０〜１００℃に加熱して液状にした状態下に混合すればよい。このようにして得られたスキンケア剤を、吸収性物品における着用者の皮膚に当接する部材である表面シートや防漏カフに施すためには、該スキンケア剤を例えば６０〜８０℃に加熱して液状にした状態下に、塗布、噴霧、浸漬等の方法で該部材の表面に付着させればよい。具体的には、例えばダイコーター方式、スロットスプレー方式、カーテンスプレー方式、メルトブローン方式、スパイラルスプレー方式、グラビア方式、ビード方式等を用いることができる。 In order to obtain a skin care agent by mixing the amide derivative represented by the formula (I) and an aliphatic monoalcohol having 14 to 22 carbon atoms, for example, in a state in which they are heated to 60 to 100 ° C. To be mixed. In order to apply the skin care agent thus obtained to a surface sheet or a leak-proof cuff which is a member that contacts the skin of the wearer in the absorbent article, the skin care agent is heated to, for example, 60 to 80 ° C. What is necessary is just to make it adhere to the surface of this member by methods, such as application | coating, spraying, and immersion, in the liquefied state. Specifically, for example, a die coater method, a slot spray method, a curtain spray method, a melt blown method, a spiral spray method, a gravure method, a bead method and the like can be used.
吸収性物品における着用者の皮膚に当接する部材にスキンケア剤を直接施すことに代えて、間接的に施す手段を採用することもできる。例えば、吸収性物品における表面シートにスキンケア剤を上述の各種の方法で直接施した後、該スキンケア剤が施されていない防漏カフを該表面シートと当接させる。この当接によって、表面シートに施されていたスキンケア剤の一部が防漏カフに移行して、間接的に防漏カフにスキンケア剤が施される。なお、当接状態下に加圧を行ってスキンケア剤の移行が促進するようにしてもよい。 Instead of directly applying the skin care agent to the member in contact with the wearer's skin in the absorbent article, a means for applying it indirectly may be employed. For example, after a skin care agent is directly applied to the top sheet of the absorbent article by the various methods described above, a leak-proof cuff that is not provided with the skin care agent is brought into contact with the top sheet. By this contact, a part of the skin care agent applied to the top sheet is transferred to the leak-proof cuff, and the skin care agent is indirectly applied to the leak-proof cuff. In addition, you may make it accelerate | stimulate the transfer of a skin care agent by performing pressurization under a contact state.
また、本発明において十分なスキンケア効果が発現するスキンケア剤の使用量（表面シート等への付着量）は、坪量で表して好ましくは０．３〜２ｇ／ｍ2、更に好ましくは０．５〜１ｇ／ｍ2である。 Moreover, the usage-amount (adhesion amount to a surface sheet etc.) of the skin care agent in which sufficient skin care effect expresses in this invention is preferably 0.3-2 g / m < 2 > expressed by basic weight, More preferably, it is 0.5. ˜1 g / m 2 .
吸収性物品における着用者の皮膚に当接する部材として表面シートにスキンケア剤を施す場合には、それに先立ち、表面シートに親水化処理を施しておくことが好ましい。例えば表面シートが各種の不織布からなる場合には、該不織布の構成繊維の表面に親水化剤を付着させたり、該構成繊維中に親水化剤を練り込んだりすることで、親水化処理を行うことができる。その後に、繊維の表面にスキンケア剤を上述の各種の方式で施せばよい。 When a skin care agent is applied to the topsheet as a member that contacts the wearer's skin in the absorbent article, it is preferable to perform a hydrophilic treatment on the topsheet prior to that. For example, when the surface sheet is made of various nonwoven fabrics, a hydrophilic treatment is performed by attaching a hydrophilic agent to the surface of the constituent fibers of the nonwoven fabric or kneading the hydrophilic agent into the constituent fibers. be able to. Thereafter, the skin care agent may be applied to the surface of the fiber by the various methods described above.
前記の表面シートを構成する不織布としては、例えば各種の熱可塑性樹脂から構成される繊維を含むものを用いることができる。熱可塑性樹脂としては、ポリエチレンやポリプロピレン等のポリオレフィン樹脂、ポリエチレンテレフタレート等のポリエステル樹脂などを用いることができる。繊維は、これらの樹脂の単独繊維又は２種以上の樹脂を含むブレンド繊維や複合繊維であり得る。繊維の太さは概ね０．５〜８．９ｄｔｅｘ、特に、概ね１〜５．６ｄｔｅｘの範囲内である。これらの繊維に加えて、天然繊維や半天然繊維を不織布中にブレンドすることもできる。不織布の坪量は、１０〜６０ｇ／ｍ2、特に１５〜３０ｇ／ｍ2とすることが好ましい。 As a nonwoven fabric which comprises the said surface sheet, what contains the fiber comprised, for example from various thermoplastic resins can be used. As the thermoplastic resin, polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, and the like can be used. The fiber may be a single fiber of these resins or a blend fiber or a composite fiber containing two or more resins. The thickness of the fiber is generally in the range of 0.5 to 8.9 dtex, in particular approximately 1 to 5.6 dtex. In addition to these fibers, natural fibers and semi-natural fibers can also be blended into the nonwoven fabric. The basis weight of the nonwoven fabric is preferably 10 to 60 g / m 2 , particularly preferably 15 to 30 g / m 2 .
前記アミド誘導体としては、モノアミド誘導体、ジアミド誘導体、トリアミド誘導体及びポリアミド誘導体などが挙げられる。式（Ｉ）において、Ｒ1の好ましい例としては、炭素数１〜１８のアルキル基；炭素数１〜１８のモノ又はジ−ヒドロキシアルキル基；炭素数１〜６のアルコキシ基で置換された炭素数１〜１８のアルキル基；及びヒドロキシ基と炭素数１〜６のアルコキシ基で置換された炭素数１〜１８のアルキル基が挙げられる。特に炭素数１〜１８のアルキル基；炭素数２〜１２のモノ−又はジ−ヒドロキシアルキル基；炭素数１〜６のアルコキシ基で置換された炭素数２〜１２のアルキル基；ヒドロキシ基と炭素数１〜６のアルコキシ基で置換された炭素数２〜１２のアルキル基であることが好ましい。Ｒ2の好ましい例としては、炭素数１〜１２の直鎖又は分岐鎖のアルキレン基、特に炭素数２〜６の直鎖又は分岐鎖のアルキレン基が挙げられる。Ｒ3の好ましい例としては、水素原子、又は炭素数１〜６のアルコキシ基で置換された炭素数１〜６のアルキル基が挙げられる。Ｒ4の好ましい例としては、炭素数２〜３４の直鎖又は分岐鎖の二価炭化水素基、特に炭素数２〜３４の直鎖又は分岐鎖のアルキレン基；及び１〜４個の二重結合を有する炭素数２〜３４のアルケニレン基が挙げられ、とりわけ炭素数２〜２４の直鎖又は分岐鎖のアルキレン基；及び１〜４個の二重結合を有する炭素数２〜２４のアルケニレン基が好ましい。Ｒ5の好ましい例としては、炭素数１〜１８のアルキル基；炭素数１〜１８のモノ又はジ−ヒドロキシアルキル基；炭素数１〜６のアルコキシ基で置換された炭素数１〜１８のアルキル基；及びヒドロキシ基と炭素数１〜６のアルコキシ基で置換された炭素数１〜１８のアルキル基が挙げられる。Ｒ6の好ましい例としては、水素原子、又は炭素数１〜６のアルコキシ基で置換された炭素数１〜６のアルキル基が挙げられる。式（Ｉ）で表されるアミド誘導体は単独で又は２種以上を組み合わせて用いることができる。特に好ましいアミド誘導体は、後述する実施例において用いた式（１）で表されるジアミド誘導体である。 Examples of the amide derivatives include monoamide derivatives, diamide derivatives, triamide derivatives, and polyamide derivatives. In formula (I), preferred examples of R 1 include an alkyl group having 1 to 18 carbon atoms; a mono- or di-hydroxyalkyl group having 1 to 18 carbon atoms; a carbon substituted with an alkoxy group having 1 to 6 carbon atoms. And an alkyl group having 1 to 18 carbon atoms; and an alkyl group having 1 to 18 carbon atoms substituted with a hydroxy group and an alkoxy group having 1 to 6 carbon atoms. In particular, an alkyl group having 1 to 18 carbon atoms; a mono- or dihydroxyalkyl group having 2 to 12 carbon atoms; an alkyl group having 2 to 12 carbon atoms substituted with an alkoxy group having 1 to 6 carbon atoms; a hydroxy group and carbon It is preferable that it is a C2-C12 alkyl group substituted by the C1-C6 alkoxy group. Preferable examples of R 2 include a linear or branched alkylene group having 1 to 12 carbon atoms, particularly a linear or branched alkylene group having 2 to 6 carbon atoms. Preferable examples of R 3 include a hydrogen atom or an alkyl group having 1 to 6 carbon atoms substituted with an alkoxy group having 1 to 6 carbon atoms. Preferable examples of R 4 include linear or branched divalent hydrocarbon groups having 2 to 34 carbon atoms, particularly linear or branched alkylene groups having 2 to 34 carbon atoms; and 1 to 4 double groups. And a C2-C34 alkenylene group having a bond, especially a C2-C24 linear or branched alkylene group; and a C2-C24 alkenylene group having 1-4 double bonds Is preferred. Preferred examples of R 5 include an alkyl group having 1 to 18 carbon atoms; a mono- or di-hydroxyalkyl group having 1 to 18 carbon atoms; and an alkyl group having 1 to 18 carbon atoms substituted with an alkoxy group having 1 to 6 carbon atoms. Group; and an alkyl group having 1 to 18 carbon atoms substituted with a hydroxy group and an alkoxy group having 1 to 6 carbon atoms. Preferable examples of R 6 include a hydrogen atom or an alkyl group having 1 to 6 carbon atoms substituted with an alkoxy group having 1 to 6 carbon atoms. The amide derivatives represented by the formula (I) can be used alone or in combination of two or more. A particularly preferred amide derivative is a diamide derivative represented by the formula (1) used in Examples described later.
式（Ｉ）で表されるアミド誘導体は、３６℃における粘度が５０００ｍＰａ・ｓ以下、特に２００〜５０００ｍＰａ・ｓ、とりわけ５００〜２０００ｍＰａ・ｓのものを使用するか、そのようになるように必要に応じて粘度調節したものを用いることが、該アミド誘導体の皮膚への移行性が良好となることから好ましい。粘度の測定は例えば以下のようにして行うことができる。 The amide derivative represented by the formula (I) should be used so that the viscosity at 36 ° C. is 5000 mPa · s or less, particularly 200 to 5000 mPa · s, particularly 500 to 2000 mPa · s. It is preferable to use a material whose viscosity is adjusted according to the good transferability of the amide derivative to the skin. The viscosity can be measured, for example, as follows.
アミド誘導体の粘度は、音叉型振動式粘度計（本発明では代表的にVIBRO NISCOMETERCJV5000（株式会社エー・アンド・デイ社製）を使用）を用いて測定を行う。予め１００℃程度に加熱したアミド誘導体を室温まで徐冷し、３６℃での粘度を測定する。 The viscosity of the amide derivative is measured using a tuning fork type vibration viscometer (typically, VIBRO NISCOMETERCJV5000 (manufactured by A & D Co., Ltd.) is used in the present invention). The amide derivative previously heated to about 100 ° C. is gradually cooled to room temperature, and the viscosity at 36 ° C. is measured.
式（Ｉ）で表されるアミド誘導体に加えて、その他のエモリエント剤をスキンケア剤に配合することもできる。そのような他のエモリエント剤としては、例えば流動パラフィン、シリコーンオイル、動植物油（オリーブ油、ホオバ油、ベニバナ油、スクワラン及びスクワレン等）、モノグリセライド、ジグリセライド、トリグリセライド、脂肪族エーテル（ミリスチル−１，３−ジメチルブチルエーテル、パルミチル−１，３−ジメチルブチルエーテル、ステアリル−１，３−ジメチルブチルエーテル、パルミチル−１，３−メチルプロピルエーテル、ステアリル−１，３−メチルプロピルエーテル等）、イソステアリル−コレステロールエステル、パラフィンワックス等が挙げられる。 In addition to the amide derivative represented by the formula (I), other emollients can be added to the skin care agent. Examples of such other emollients include liquid paraffin, silicone oil, animal and vegetable oils (olive oil, jojoba oil, safflower oil, squalane and squalene, etc.), monoglyceride, diglyceride, triglyceride, aliphatic ether (myristyl-1,3- Dimethylbutyl ether, palmityl-1,3-dimethylbutyl ether, stearyl-1,3-dimethylbutyl ether, palmityl-1,3-methylpropyl ether, stearyl-1,3-methylpropyl ether, etc.), isostearyl-cholesterol ester, paraffin A wax etc. are mentioned.
更に本発明で用いるスキンケア剤には必要に応じて、セラミド類、プソイドセラミド、スフィンゴ糖脂質、スフィンゴリン脂質等を配合してもよい。セラミド類には、脳や皮膚から抽出、精製された天然セラミドと、微生物学的方法又は化学的方法によって合成された合成セラミドとが含まれる。プソイドセラミドは、例えば特開昭６２−２２８０４８号公報及び特開昭６３−２１６８５２号公報等に記載された方法に従って製造することができる。プソイドセラミドとして好ましいものとしては、次の式（II）で表わされる化合物が挙げられる。 Furthermore, ceramides, pseudoceramides, glycosphingolipids, sphingophospholipids and the like may be blended in the skin care agent used in the present invention, if necessary. Ceramides include natural ceramides extracted and purified from brain and skin, and synthetic ceramides synthesized by microbiological or chemical methods. Pseudoceramide can be produced according to the methods described in, for example, JP-A-62-228048 and JP-A-63-216852. Preferable examples of pseudoceramide include compounds represented by the following formula (II).
スフィンゴ糖脂質及びスフィンゴリン脂質には、前記のセラミド類と同様に、天然由来のものと合成物とがある。スフィンゴ糖脂質としては、例えば、構成糖がグルコース、マンノース、ガラクトース、グルクロン酸、グルコサミン等からなるものが挙げられ、セレブロシド及びその硫酸エステルも含まれる。スフィンゴリン脂質としてはスフィンゴミエリンが例示される。 Glycosphingolipids and glycosphingolipids are naturally derived and synthetic, as with the ceramides described above. Examples of the sphingoglycolipid include those in which the constituent sugar is composed of glucose, mannose, galactose, glucuronic acid, glucosamine, and the like, and cerebroside and sulfate thereof. Examples of sphingophospholipids include sphingomyelin.
本発明の吸収性物品の具体例としては、使い捨ておむつ、生理用ナプキン、失禁パッド、パンティライナー、おりものシート等が挙げられるが、これらに限られず、人体から排泄される排泄物の吸収保持に用いられる物品を広く包含する。 Specific examples of the absorbent article of the present invention include disposable diapers, sanitary napkins, incontinence pads, panty liners, and vaginal sheets, but are not limited to these, for absorbing and holding excreta excreted from the human body. Widely encompasses the articles used.
以上のとおり、装着前後における着用者の皮膚の接触角θ１，θ２がほぼ同じ吸収性物品は、スキンケア効果が高いものである。これを別の側面から見ると、新規のスキンケア剤を開発し、該スキンケア剤を有する吸収性物品の性能を評価したい場合には、該スキンケア剤を吸収性物品に施し、該吸収性物品の着用の前後における着用者の皮膚の接触角を測定し、両者の大小関係を比較することで、該吸収性物品のスキンケア効果の程度を客観的に評価することができることを意味している。特に、上述した＜剤移行処理＞を行うことで、実際に吸収性物品を着用しなくても、吸収性物品のスキンケア効果を簡便に評価できる。つまり本発明によれば、吸収性物品のスキンケア効果の評価方法も提供される。この評価方法においては、吸収性物品の装着前後における着用者の皮膚の接触角θ１，θ２がほぼ同じ場合には、吸収性物品のスキンケア効果が高いと評価し、異なる場合は吸収性物品のスキンケア効果が高くないと評価する。また、θ１が９０度以上１００度以下の場合には、吸収性物品のスキンケア効果が高いと評価し、θ１が９０度未満又は１００度超の場合には、吸収性物品のスキンケア効果が高くないと評価することもできる。このような評価方法は、新規なスキンケア剤を有する吸収性物品の開発等に極めて有用である。 As described above, an absorbent article having substantially the same contact angle θ1, θ2 of the wearer's skin before and after wearing has a high skin care effect. Viewed from another aspect, when developing a new skin care agent and evaluating the performance of the absorbent article having the skin care agent, the skin care agent is applied to the absorbent article and the absorbent article is worn. This means that the degree of skin care effect of the absorbent article can be objectively evaluated by measuring the contact angle of the wearer's skin before and after the comparison and comparing the magnitude relationship between the two. In particular, by performing the <agent transfer treatment> described above, the skin care effect of the absorbent article can be easily evaluated without actually wearing the absorbent article. That is, according to this invention, the evaluation method of the skin care effect of an absorbent article is also provided. In this evaluation method, when the contact angles θ1 and θ2 of the wearer's skin before and after mounting of the absorbent article are substantially the same, it is evaluated that the skin care effect of the absorbent article is high. Evaluate that the effect is not high. Moreover, when θ1 is 90 degrees or more and 100 degrees or less, it is evaluated that the skin care effect of the absorbent article is high. When θ1 is less than 90 degrees or more than 100 degrees, the skin care effect of the absorbent article is not high. It can also be evaluated. Such an evaluation method is extremely useful for developing an absorbent article having a novel skin care agent.
以下、実施例により本発明を更に詳細に説明する。しかしながら本発明の範囲は、かかる実施例に制限されない。特に断らない限り、「部」は及び「質量部」を意味する。 Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited to such examples. Unless otherwise specified, “part” means “part by mass”.
〔実施例１〕
（１）スキンケア剤の調製
スキンケア剤におけるエモリエント剤として、以下の式（１）で表されるジアミド誘導体を用いた。このジアミド誘導体の３６℃での粘度は１８００ｍＰａ・ｓであった。このジアミド誘導体の固定化剤としてステアリルアルコールを用いた。ジアミド誘導体とステアリルアルコールとを８０℃に加熱して溶融させ均一に混合した。使用量は、ジアミド誘導体２部に対してステアリルアルコール８部とした。このようにしてスキンケア剤を得た。
[Example 1]
(1) Preparation of skin care agent A diamide derivative represented by the following formula (1) was used as an emollient agent in a skin care agent. The viscosity of this diamide derivative at 36 ° C. was 1800 mPa · s. Stearyl alcohol was used as a fixing agent for the diamide derivative. The diamide derivative and stearyl alcohol were heated to 80 ° C. and melted and mixed uniformly. The amount used was 8 parts stearyl alcohol per 2 parts diamide derivative. In this way, a skin care agent was obtained.
（２）モデル表面シートの製造
モデル表面シートとして、使い捨ておむつの表面シートに、前記の（１）で得られたスキンケア剤を施したものを作製した。表面シートとしては、芯成分がポリプロピレンで、鞘成分がポリエチレンである繊度３．３ｄｔｅｘの芯鞘型複合繊維を原料とする坪量３０ｇ／ｍ2のエアスルー不織布を使用した。この不織布の原料繊維には、予め親水化剤による親水化処理を施しておいた。この不織布に、スプレーコーターを用いて前記の（１）で得られたスキンケア剤を不織布の全面に施した。スプレーコーターの塗工は、スキンケア剤を８０℃に加熱溶融させて行った。スキンケア剤の塗工量は、５０μｇ／ｃｍ2（０．５ｇ／ｍ2）とした。
(2) Production of model surface sheet A model surface sheet was prepared by applying the skin care agent obtained in (1) above to the surface sheet of a disposable diaper. As the surface sheet, an air-through nonwoven fabric having a basis weight of 30 g / m 2 made of a core-sheath type composite fiber having a fineness of 3.3 dtex and having a core component of polypropylene and a sheath component of polyethylene was used. The raw fiber of this nonwoven fabric was previously subjected to a hydrophilic treatment with a hydrophilizing agent. The skin care agent obtained in the above (1) was applied to the entire surface of the nonwoven fabric using a spray coater. The spray coater was applied by heating and melting the skin care agent at 80 ° C. The coating amount of the skin care agent was 50 μg / cm 2 (0.5 g / m 2 ).
（３）θ２の測定
前記の＜洗浄・馴化処理＞を経た５人の健常な成人を被験者とし、該被験者の前腕内側部の皮膚それぞれについて、前記の＜接触角の測定方法＞に従って、接触角θ２を測定し、平均値を測定した。
(3) Measurement of θ2 Five healthy adults who have undergone the above <cleaning / acclimation treatment> were subjects, and the contact angle was determined for each skin on the inner side of the forearm of the subject according to the above <Measurement Method of Contact Angle> θ2 was measured and the average value was measured.
（４）θ１の測定
θ２の測定を行った前記被験者のθ２の測定部位に、前記で作製した表面シートを用いて前記の＜剤移行処理＞を行った後、前記の＜接触角の測定方法＞に従って、接触角θ１を測定し、平均値を測定した。その結果を図３のグラフに示す。
(4) Measurement of θ1 After performing the above <agent transfer process> on the measurement site of θ2 of the subject who measured θ2, using the surface sheet prepared above, the above <Method for measuring contact angle>>, The contact angle θ1 was measured, and the average value was measured. The result is shown in the graph of FIG.
〔比較例１〕
ワセリン４部に対してステアリルアルコール１部を使用してスキンケア剤を調製し、かつ不織布へのスキンケア剤の塗工量を０．５ｇ／ｍ2の代わりに１０．２ｇ／ｍ2とした以外は、実施例１と同様にして不織布にスキンケア剤を施した。この不織布について実施例１と同様に、θ１を測定した。その結果を図３のグラフに示す。
[Comparative Example 1]
Use 1 parts of stearyl alcohol to prepare a skin care agent to petrolatum 4 parts, and except that the 10.2 g / m 2 of coating weight of skin care agent to a nonwoven fabric instead of 0.5 g / m 2 is The skin care agent was applied to the nonwoven fabric in the same manner as in Example 1. For this nonwoven fabric, θ1 was measured in the same manner as in Example 1. The result is shown in the graph of FIG.
〔比較例２〕
実施例１において、ジアミド誘導体５部に対してステアリルアルコール５部を用いてスキンケア剤を調製した。これ以外は実施例１と同様に、θ１を測定した。その結果を図３のグラフに示す。
[Comparative Example 2]
In Example 1, a skin care agent was prepared using 5 parts of stearyl alcohol with respect to 5 parts of the diamide derivative. Except for this, θ1 was measured in the same manner as in Example 1. The result is shown in the graph of FIG.
〔評価〕
実施例及び比較例（ただし比較例２は除く。）で得られたモデル表面シートを用い、Ｔｅｗａｍｅｔｅｒによって、被験者のＴＥＷＬ（経皮水分蒸散量）の測定を行った。ＴＥＷＬは皮膚から蒸発する水の量（ｇ／ｍ2／ｈｒ）を示し、その値が高いほど一般的に皮膚のバリア機能は低下していると言われている。そこで本評価では、実施例及び比較例で得られたモデル表面シートによるスキンケア効果をＴＥＷＬで評価することとした。効果の程度は、ＴＥＷＬの変化量（ΔＴＥＷＬ）で示す。具体的には、接触角を測定したのと同様の手順で、実施例１及び比較例１で調製したスキンケア剤を、１０人の健常な成人の前腕内側部の皮膚にそれぞれ移行させ、移行前後でのＴＥＷＬの値をそれぞれ測定し、平均を求めた。そして、スキンケア剤塗布前のＴＥＷＬの値から、スキンケア剤塗布後のＴＥＷＬの値を差し引くことによって、ＴＥＷＬの変化量（ΔＴＥＷＬ＝スキンケア剤塗布前のＴＥＷＬの値−スキンケア剤塗布後のＴＥＷＬの値）を求めた。ＴＥＷＬの測定は、マルチプローブアダプターＭＰＡ５に、テヴァメーターTewameter TM300（いずれもCourage + Khazaka electric GmbH製）を取り付けたものを用い、２３．２℃、湿度４７％ＲＨの条件下で行った。その結果を以下の表１に示す。
[Evaluation]
Using the model surface sheets obtained in Examples and Comparative Examples (excluding Comparative Example 2), the TEWL (transcutaneous moisture transpiration) of the subject was measured by Tewmeter. TEWL indicates the amount of water (g / m 2 / hr) that evaporates from the skin, and it is generally said that the higher the value, the lower the barrier function of the skin. Therefore, in this evaluation, the skin care effect by the model surface sheets obtained in the examples and comparative examples was evaluated by TEWL. The degree of the effect is indicated by the change amount of TEWL (ΔTEWL). Specifically, the skin care agent prepared in Example 1 and Comparative Example 1 was transferred to the skin of the inner part of the forearm of 10 healthy adults in the same procedure as the contact angle was measured. The TEWL values were measured and the average was determined. Then, by subtracting the value of TEWL after applying the skin care agent from the value of TEWL before applying the skin care agent, the amount of change in TEWL (ΔTEWL = the value of TEWL before applying the skin care agent−the value of TEWL after applying the skin care agent) Asked. TEWL was measured using a multi-probe adapter MPA5 with a Tevameter TM300 (both manufactured by Courage + Khazaka electric GmbH) under the conditions of 23.2 ° C. and humidity 47% RH. The results are shown in Table 1 below.
図３及び表１に示す結果から明らかなように、実施例１で得られたモデル表面シートを用いてスキンケア剤を皮膚に移行させると、比較例１で得られたモデル表面シートを用いてスキンケア剤を皮膚に移行させた場合に比べて、ＴＥＷＬの変化量（ΔＴＥＷＬ）が大きくなり、実施例１の方が比較例１よりもスキンケア効果が高いことが判る。 As is clear from the results shown in FIG. 3 and Table 1, when the skin care agent was transferred to the skin using the model surface sheet obtained in Example 1, skin care was performed using the model surface sheet obtained in Comparative Example 1. Compared with the case where the agent is transferred to the skin, the amount of change in TEWL (ΔTEWL) increases, and it can be seen that the skin care effect of Example 1 is higher than that of Comparative Example 1.
Claims (4)
前記スキンケア剤として、吸収性物品を着用して該スキンケア剤が移行した状態での着用者の皮膚に対する水の接触角θ１が、吸収性物品を着用する前の着用者の皮膚に対する水の接触角θ２と同じとなるか、又はθ１とθ２との差がθ２の５％以下となるものを用い、
前記スキンケア剤は、エモリエント剤及びその固定化剤を含み、
前記エモリエント剤として下記式（Ｉ）で表されるアミド誘導体を用い、
前記アミド誘導体と前記脂肪族モノアルコールとの合計質量に対して前記脂肪族モノアルコールを６０〜９０質量％用い、
前記部材に施された前記アミド誘導体及び前記脂肪族モノアルコールの合計の坪量が０．３〜２ｇ／ｍ 2 である、吸収性物品。 In an absorbent article in which a skin care agent is applied to a member that comes into contact with the wearer's skin when worn,
As the skin care agent, the water contact angle θ1 to the wearer's skin in a state where the absorbent article is worn and the skin care agent has been transferred is the water contact angle to the wearer's skin before wearing the absorbent article. Use the same as θ2 , or the difference between θ1 and θ2 is 5% or less of θ2 ,
The skin care agent comprises an emollient and its immobilizing agent,
Using an amide derivative represented by the following formula (I) as the emollient,
60 to 90% by mass of the aliphatic monoalcohol is used with respect to the total mass of the amide derivative and the aliphatic monoalcohol,
The basis weight of the total of the amide derivative and the aliphatic monoalcohol has been subjected to said member is 0.3 to 2 g / m 2, the absorbent article.
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