WO2016157915A1

WO2016157915A1 - Nonwoven fabric to be adhered to skin and method for manufacturing same

Info

Publication number: WO2016157915A1
Application number: PCT/JP2016/001886
Authority: WO
Inventors: 明秀石澤; 真希伊藤
Original assignee: 王子ホールディングス株式会社
Priority date: 2015-04-03
Filing date: 2016-04-01
Publication date: 2016-10-06
Also published as: KR101999628B1; JPWO2016157915A1; JP6579192B2; TWI637089B; KR20170104620A; CN107407026A; CN107407026B; TW201641769A

Abstract

Provided are a nonwoven fabric to be adhered to the skin, said nonwoven fabric having excellent liquid retention properties and high adhesiveness to the skin, and a method for manufacturing the same. The nonwoven fabric to be adhered to the skin, which is to be impregnated with a liquid before using, comprises an aqueous binder having a glass transition point of 10^°C or lower, has a basis weight of 20-80 g/m² inclusive, and has a thickness of 1 mm or less before the impregnation with the liquid.

Description

Non-woven fabric for skin application and method for producing the same

The present invention relates to a non-woven fabric for skin application, and more particularly to a non-woven fabric for skin application used by absorbing liquids such as chemicals and lotions and attaching to skin such as the face, body, hands and feet, and a method for producing the same.

Conventionally, non-woven fabrics for skin use that absorb and absorb liquids such as chemicals and lotions are used for medical purposes and cosmetic purposes. Non-woven fabric for skin application for medical purposes includes, for example, a wound dressing and a drug sustained release patch. Moreover, there exist a face mask etc. in the nonwoven fabric for skin affixing for beauty purposes, for example. These non-woven fabrics for skin application absorb and retain an appropriate amount of liquid (retention property), follow the undulation of the applied site, adhere to the skin, and maintain it (stickiness), etc. Various qualities are required.

In recent years, hydrophilic fibers such as cellulosic fibers having higher hydrophilicity than synthetic fibers are preferably used as the main component of the non-woven fabric for skin application in order to obtain good liquid retention.

Patent Document 1 discloses a fine cellulose fiber comprising specific fine cellulose fibers on one surface or both surfaces of a nonwoven fabric layer containing cellulosic fibers as a constitution for obtaining good stickiness in addition to liquid retention. A nonwoven fabric structure in which nonwoven fabric layers are laminated and integrated is disclosed.

JP 2014-205924 A

However, in Patent Document 1, it is necessary to produce fine cellulose fibers made of specific fine cellulose, which increases the cost. Therefore, the configuration of Patent Document 1 is intended for high-end products and is not suitable for general-purpose products.

The present invention aims to provide a non-woven fabric for skin application and a method for producing the same, which are different from Patent Document 1 but have good liquid retention and sticking properties.

The non-woven fabric for skin application of the present invention and a method for producing the same for solving the above-described problems have the following aspects.

[1] A non-woven fabric for skin application to be used by including a liquid, comprising an aqueous binder having a glass transition point of 10 ° C. or lower, and having a basis weight of 20 g / m ² or more and 80 g / m ² or less, A non-woven fabric for skin application, having a thickness of 1 mm or less before including a liquid.

[2] The non-woven fabric for skin application according to [1], wherein the aqueous binder is an ethylene vinyl acetate copolymer.

[3] The non-woven fabric for skin application is a dry non-woven fabric obtained by joining a plurality of fiber sheets formed by an airlaid method with an aqueous binder and then compressing them, [1] or [2 ] The nonwoven fabric for skin affixing of description.

[4] The skin affixing nonwoven fabric according to any one of [1] to [3], wherein the skin affixing nonwoven fabric has a cellulose-based fiber as a main component.

[5] The non-woven fabric for skin application contains cellulosic fibers in an amount of 50% by mass or more based on the total mass of the non-woven fabric for skin application, from [1] to [4] The nonwoven fabric for skin affixation as described in any one.

[6] The skin-bonding nonwoven fabric contains the aqueous binder in an amount of 5% by mass to 30% by mass, according to any one of [1] to [5] Non-woven fabric for skin application.

[7] The step of forming a plurality of fiber sheets by the airlaid method and the formed plurality of fiber sheets are joined to each other with an aqueous binder having a glass transition point of 10 ° C. or less, and the basis weight is 20 g / m ² or more and 80 g. A process for obtaining a dry nonwoven fabric of / m ² or less and a process for compressing the obtained dry nonwoven fabric so that the paper thickness is 1 mm or less.

According to the present invention, it is possible to provide a non-woven fabric for skin application that has good liquid retention and sticking properties.

It is a table | surface which shows the structure and test result of the nonwoven fabric for skin sticking which concern on an Example. It is a table | surface which shows the structure and test result of the nonwoven fabric for skin sticking which concerns on a comparative example.

Hereinafter, embodiments of the present invention will be described in detail. The embodiment of the present invention is not limited to the embodiment described below.

<Non-woven fabric for skin application>
The non-woven fabric for skin application of the present invention is a non-woven fabric for skin application provided for use by containing a liquid, and includes an aqueous binder having a glass transition point of 10 ° C. or less, and a basis weight of 20 g / m ² or more and 80 g / m. m ² or less, and the thickness before including the liquid is 1 mm or less.
The nonwoven fabric for skin application of the present invention contains hydrophilic fibers as a main component. The hydrophilic fiber is preferably a cellulosic fiber. The non-woven fabric for skin application of the present invention can be preferably obtained by joining a plurality of fiber sheets formed by the airlaid method to each other with an aqueous binder and compressing them.

The skin-bonding nonwoven fabric of the present invention has a laminated structure comprising a plurality of laminated fiber sheets and an aqueous binder distributed throughout the laminated plurality of fiber sheets. The aqueous binder is distributed substantially uniformly in the thickness direction of the laminated structure, and serves to bond adjacent fiber sheets to each other and to fix the internal fibers.

As described above, the nonwoven fabric for skin application of the present invention can be obtained by bonding fiber sheets to each other with an aqueous binder and compressing them. Therefore, the non-woven fabric for skin application of the present invention is in the same state without being subjected to a compression step, in which the fibers are in a state where the distance between the fibers is reduced by compression in the stage before being used. The thickness is thinner than the non-woven fabric for skin application. On the other hand, when the non-woven fabric for skin application according to the present invention is used for use by containing a liquid, water enters the internal voids, and the fibers themselves swell and the thickness is restored. be able to.

(Method for producing non-woven fabric for skin application)
The nonwoven fabric for skin application of the present invention can be obtained by compressing a dry nonwoven fabric produced by a dry method. Among the dry methods, a process of forming a fiber web by dry disaggregation of raw fibers (formation process), and a process of spraying an aqueous emulsion (aqueous binder) serving as a binder to the fiber web (binder spray) A so-called air laid method (sometimes referred to as an air laid method) is used. The airlaid method includes the Honshu paper manufacturing method, the Karl Croyer method, the Dunweb method, the J & J method, the KC method, the Scott method, etc. Among them, the Honshu paper manufacturing method is most preferably used. The produced dry nonwoven fabric is compressed under the condition that the thickness before the liquid is contained is 1 mm or less. For the compression, any known means such as passing through a slit or a calendar nip can be used.

(Thickness of non-woven fabric for skin application)
The non-woven fabric for skin application according to the present invention is in a state where the thickness is thin at the stage before use in order to improve the property of sticking to the skin following the undulation of the applied site and its durability (sticking property) It is formed by being compressed. In use, the thickness of the non-woven fabric for skin application is gradually restored to the original thickness by including a liquid.

The dry nonwoven fabric of the present invention has a thickness of not more than 1 mm, preferably not more than 0.8 mm, more preferably not more than 0.4 mm, in order to obtain a good sticking property. More preferably, it is 0.3 mm or less. The lower limit of the thickness before including the liquid is not particularly limited as long as the effect of the present invention is exerted, but there is a limit of the thickness (thinness) according to the basis weight or density, and the skin adhesive From the viewpoint of usability when used as a worn nonwoven fabric, it is usually 0.05 mm or more.

(Fiber used for non-woven fabric for skin application)
The non-woven fabric for skin application of the present invention contains hydrophilic fibers as raw fibers. The hydrophilic fiber is preferably a cellulosic fiber.

As raw materials for cellulosic fibers, it is possible to use wood pulp (conifers, hardwoods), rug pulp, linter pulp, linen pulp, non-wood pulp such as straw, three bases, and husk pulp, waste paper pulp, and the like. In particular, wood pulp fibers are useful and preferred industrially. As such wood pulp fiber, ground pulp (GP), refiner ground pulp (RGP), thermomechanical pulp (TMP) which is mechanical pulp, sulfite pulp, kraft pulp, etc. which are chemical pulps can be used. In addition, regenerated fibers such as rayon (cellulose fiber produced by the viscose method) and Tencel (registered trademark) (purified cellulose fiber by solvent spinning) can also be used. One kind of the above-mentioned cellulosic fibers may be used, or two or more kinds may be used.

As a raw material of the cellulosic fiber used in the present invention, softwood kraft pulp (NKP) is particularly suitable from the viewpoint of supply amount, quality stability, cost and the like.

The non-woven fabric for skin application of the present invention is mainly composed of hydrophilic fibers, and is preferably 50% by mass or more, more preferably 60% by mass or more, and still more preferably based on the total mass of the non-woven fabric for skin application. The hydrophilic fiber is contained in an amount of 70% by mass or more, particularly preferably 75% by mass or more. When the blending amount of the hydrophilic fiber is large, the water absorption amount of the non-woven fabric for skin application increases and the liquid retention becomes good. About the upper limit of the compounding quantity of a hydrophilic fiber, from a viewpoint of the minimum value of the compounding quantity of the aqueous binder mentioned later, and the intensity | strength obtained by it, Preferably it is 95 mass% or less.

The non-woven fabric for skin application of the present invention may contain hydrophobic fibers of any material depending on the situation. When using a hydrophobic fiber, it is preferable that the compounding quantity is 0.01 mass% or more and 30 mass% or less on the basis of the total mass of the raw material fiber of the nonwoven fabric for skin sticking. By including hydrophobic fibers in an amount within this range, the non-woven fabric for skin application can ensure adequate liquid retention and can appropriately transfer the retained liquid to the skin application site. .

Examples of hydrophobic fibers include polyolefin fibers such as polyethylene (PE) and polypropylene (PP), polyester (PET) fibers, and nylon fibers. Moreover, the composite fiber formed by combining synthetic resins having different melting points can be used. There are PE / PP, PE / PET, PP / PET, low-melting point PET / PET, low-melting point PP / PP, nylon 6 / nylon 66, etc. as combinations of the composite fiber resins. It is. The composite fiber includes a side-by-side type composite fiber obtained by spinning different resins in parallel, a core-sheath type composite fiber obtained by spinning the low melting point resin as the outside and the high melting point resin as the inside, and any of them can be used.

The average fiber length of the raw fibers of the non-woven fabric for skin application is preferably 1 to 10 mm, more preferably 1 to 6 mm. It is also possible to use a mixture of fibers having different fiber lengths. When the average fiber length of the raw fibers is within this range, it is easy to form a web by the airlaid method, and it is easy to obtain a uniform dispersion state of the fibers.

In addition, the average fiber diameter of the raw fiber of the non-woven fabric for skin application is preferably 3 μm or more, more preferably 3 to 100 μm, still more preferably 5 to 80 μm, and particularly preferably 10 to 60 μm. The average fiber length and average fiber diameter were each measured at five points with an optical microscope and calculated as the average value.

(Water-based binder)
The nonwoven fabric for skin application of the present invention contains an aqueous binder having a glass transition point (Tg) of 10 ° C. or lower. In the present invention, the aqueous binder is used for fixing the fibers together.

Examples of aqueous binders include aqueous solutions such as casein, sodium alginate, hydroxyethylcellulose, sodium carboxymethylcellulose, polyvinyl alcohol (PVA), and sodium polyacrylate, each having a glass transition (Tg) of 10 ° C. or less. And emulsions such as polyacrylic acid ester, acrylic / styrene copolymer, polyvinyl acetate, ethylene / vinyl acetate copolymer (EVA), acrylonitrile / butadiene copolymer, methyl methacrylate / butadiene copolymer, An emulsion type binder such as styrene / butadiene copolymer latex (SBR) can be used. Among these, an emulsion type binder of ethylene / vinyl acetate copolymer (EVA) or styrene / butadiene copolymer latex (SBR) can be suitably used.

As described later, the non-woven fabric for skin application of the present invention has a basis weight set in a predetermined range in order to secure a property (liquid retention) that absorbs and retains an appropriate amount of liquid. On the other hand, the non-woven fabric for skin application according to the present invention is in a stage before being used in order to improve the property of sticking to the skin following the undulations of the applied site and its durability (stickiness). It is formed by being compressed so that the thickness is thin. And by including a liquid in use, the thickness of the non-woven fabric for skin application is gradually restored to the original thickness. Thus, by reducing the thickness by compression, the non-woven fabric for skin application tends to feel somewhat hard or feel like a film in the stage immediately after application. In the present invention, by using a water-based binder having a glass transition point (Tg) of 10 ° C. or less, it is possible to reduce the hardness and the film feeling accompanying the thickness reduction.

From the viewpoint of obtaining such an effect, the glass transition point (Tg) of the aqueous binder of the present invention is 10 ° C. or less, preferably 5 ° C. or less. The lower limit of the glass transition point (Tg) is not particularly limited as long as the effects of the present invention are exhibited. The glass transition point (Tg) is, for example, preferably −100 ° C. or higher, more preferably −50. ° C or higher, more preferably -30 ° C or higher.

The applied amount of the aqueous binder in the skin-adhering nonwoven fabric of the present invention is 5 to 30% by mass based on the total mass of the skin-adhering nonwoven fabric from the viewpoint of the balance between the strength and liquid retention of the skin adhesive nonwoven fabric. 10 to 25% by mass is more preferable.

In the aqueous binder, if necessary, a hydrophilizing agent for promoting water absorption and a pigment for coloring can be dispersed.

Examples of hydrophilizing agents include nonionic surfactants such as polyoxyethylene alkyl ethers, sorbitan fatty acid esters, sucrose fatty acid esters, and polyglycerin fatty acid esters, amphoteric surfactants such as alkylamide betaines, and polyoxyethylene alkyl ether sulfates. And anionic surfactants such as sulfosuccinate and dioctylsulfosuccinate Na salt. In the present invention, not only one type but also two types or three or more types can be mixed and used.

The addition amount of the hydrophilizing agent is not particularly limited. However, as the addition amount increases, the amount eluted from the non-woven fabric for skin application increases, so care must be taken. Preferably, the content is 0.01 to 3% based on the total mass of the non-woven fabric for skin application.

The basis weight of the non-woven fabric for skin application of the present invention is in the range of 20 to 80 g / m ² , preferably in the range of 30 to 50 g / m ² . When the basis weight is less than 20 g / m ^2, the amount of hydrophilic fibers contained per unit area is small, so that the water absorption amount of liquids such as chemicals and lotions becomes insufficient. Moreover, rigidity is low and there exists a tendency for usability to worsen when using as a skin-bonding nonwoven fabric. When the basis weight exceeds 80 g / m ² , the water absorption per unit area is large and the liquid retention is good, but the sticking property is deteriorated.

(Surface fiber layer)
The nonwoven fabric for skin application of the present invention may include a surface fiber layer on one side or both sides for the purpose of modifying the surface such as changing the softness (texture) or texture.

The surface fibrous layer, in view of the surface modification effect by stiffness and laminated as a skin sticking nonwoven, preferably in the range of per side 0.5 ~ 20g / m ^2, more preferably 0.5 ~ 10g / m ² More preferably, it is 1.0 to 3.0 g / m ² .

Cellulose fibers such as rayon and cotton are desirable from the viewpoint of water absorption and softness as the fibers used for the surface fiber layer, but other fibers such as other natural fibers and synthetic fibers (for example, polyester) can be used. It is also possible to use a mixture.

<Example 1>
A dry nonwoven fabric was manufactured as follows using an airlaid nonwoven fabric machine manufactured by Honshu Paper.

Rayon fiber (manufactured by Daiwabo Rayon Co., Ltd., 1.7 dtex (fiber diameter: 12 μm × fiber length: 29 mm) [fiber for surface fiber layer 1], commercially available softwood bleached kraft pulp (NBKP) on a traveling mesh conveyor Pulp fibers [fibers for intermediate fiber layer 1] obtained by defibrating pulp with a dry defibrating device and the same rayon fibers [fibers for surface fiber layer 2] used in the surface fiber layer 1 in this order The surface fiber layer 1 (target basis weight 2.0 g / m ² ), the intermediate fiber layer 1 (target basis weight 28.6 g / m ² ), and the surface fiber layer 2 (target basis weight) 2.0 g / m ² ) in this order was formed.

An aqueous binder liquid that is a mixed liquid of an aqueous binder and a hydrophilizing agent was sprayed onto the fiber web. Next, the fiber web was passed through a hot air dryer (atmospheric temperature 170 ° C.) to bond the fibers. Next, the fibrous web was inverted, and an aqueous binder liquid was sprayed from the side opposite to the surface where the binder liquid was first sprayed. At this time, an equal amount of an aqueous binder solution was sprayed on each of both surfaces so that the total binder solid content on both surfaces was 9.8 g / m ² . Next, the web was again passed through a hot air dryer (atmospheric temperature 170 ° C.) to obtain a dry nonwoven fabric having a basis weight of 42.5 g / m ² (target basis weight 43.0 g / m ² ). Next, the obtained dry nonwoven fabric is compressed so that the thickness of the finally obtained nonwoven fabric for skin application is 0.23 mm, thereby having a thickness of 1 mm or less (0.23 mm). A non-woven fabric for skin application was obtained.

Here, in the aqueous binder liquid, the ethylene vinyl acetate copolymer (EVA) (glass transition point (Tg) −17 ° C.) sold as product A is used as the aqueous binder, and the dioctylsulfosuccin is used as the hydrophilizing agent. Nate Na salt was used in an amount of 0.12% by mass with respect to the obtained non-woven fabric for skin application.

<Example 2>
The target basis weight of each fiber layer is defined as surface fiber layer 1 (2.0 g / m ² ), intermediate fiber layer 1 (29.7 g / m ² ), and surface fiber layer 2 (2.0 g / m ² ), As the aqueous binder, the ethylene vinyl acetate copolymer (EVA) (Glass transition point (Tg) −19 ° C.) of the sale item B is used, and the total binder solid content on both sides of the aqueous binder is 10.1 g / m ^2. A dry nonwoven fabric having a basis weight of 43.9 / m ² was obtained in the same manner as in Example 1 except for the above. Next, the obtained dry nonwoven fabric is compressed so that the thickness of the finally obtained nonwoven fabric for skin application is 0.74 mm, thereby having a thickness of 1 mm or less (0.74 mm). A non-woven fabric for skin application was obtained.

<Example 3>
The target basis weight of each fiber layer is defined as surface fiber layer 1 (2.0 g / m ² ), intermediate fiber layer 1 (27.9 g / m ² ), and surface fiber layer 2 (2.0 g / m ² ), As an aqueous binder, the ethylene vinyl acetate copolymer (EVA) (Glass transition point (Tg) 4 ° C.) of Sales C is used, and sucrose fatty acid ester is used as a hydrophilic agent, and the obtained non-woven fabric for skin application In the same manner as in Example 1, except that the total solid content of both surfaces of the aqueous binder was 7.7 g / m ² , the basis weight was 40. A dry nonwoven fabric of 1 g / m ² was obtained. Next, the obtained dry nonwoven fabric is compressed so that the thickness of the finally obtained nonwoven fabric for skin application is 0.34 mm, thereby having a thickness of 1 mm or less (0.34 mm). A non-woven fabric for skin application was obtained.

<Example 4>
The target basis weight of each fiber layer is defined as surface fiber layer 1 (2.0 g / m ² ), intermediate fiber layer 1 (27.6 g / m ² ), and surface fiber layer 2 (2.0 g / m ² ), Styrene / butadiene copolymer (SBR) (Glass transition point (Tg) -19 ° C) of Sales D is used as an aqueous binder, and sucrose fatty acid ester is used as a hydrophilizing agent. A basis weight of 42 was obtained in the same manner as in Example 3 except that the amount used was 0.56% by mass with respect to the nonwoven fabric, and the total solid content of the aqueous binder was 10.5 g / m ^2. A dry nonwoven fabric of 0.7 / m ² was obtained. Next, the obtained dry nonwoven fabric is compressed so that the thickness of the finally obtained nonwoven fabric for skin application is 0.35 mm, thereby having a thickness of 1 mm or less (0.35 mm). A non-woven fabric for skin application was obtained.

<Comparative Example 1>
The target basis weight of each fiber layer is defined as surface fiber layer 1 (2.0 g / m ² ), intermediate fiber layer 1 (27.2 g / m ² ), and surface fiber layer 2 (2.0 g / m ² ), As an aqueous binder, ethylene vinyl acetate copolymer (EVA) (Glass transition point (Tg) 14 ° C.) of sale product E is used, and sucrose fatty acid ester is obtained as a hydrophilic agent. In the same manner as in Example 3 except that the total solid content on both sides of the aqueous binder was 11.1 g / m ² , the basis weight was 42.7. A dry nonwoven fabric of / m ² was obtained. Next, the obtained dry nonwoven fabric is compressed so that the thickness of the finally obtained nonwoven fabric for skin application is 0.78 mm, thereby having a thickness of 1 mm or less (0.78 mm). A non-woven fabric for skin application was obtained.

<Comparative example 2>
The target basis weight of each fiber layer is defined as surface fiber layer 1 (2.0 g / m ² ), intermediate fiber layer 1 (27.6 g / m ² ), and surface fiber layer 2 (2.0 g / m ² ), As the aqueous binder, ethylene vinyl acetate copolymer (EVA) (Glass transition point (Tg) 20 ° C.) of sale product F is used, and sucrose fatty acid ester is obtained as the hydrophilic agent, and the obtained non-woven fabric for skin application The basis weight was 39.5 in the same manner as in Example 3 except that the total solid content of both surfaces of the aqueous binder was 7.5 g / m ^2. A dry nonwoven fabric of / m ² was obtained. Next, the obtained dry nonwoven fabric is compressed so that the thickness of the finally obtained nonwoven fabric for skin application is 0.33 mm, thereby having a thickness of 1 mm or less (0.33 mm). A non-woven fabric for skin application was obtained.

<Comparative Example 3>
First, a dry nonwoven fabric having a basis weight of 44.2 g / m ² was obtained by the same method as described in Example 1. Next, the obtained dry nonwoven fabric is compressed so that the finally obtained nonwoven fabric for skin application has a thickness of 1.02 mm, thereby having a thickness exceeding 1 mm (1.02 mm). A non-woven fabric for skin application was obtained.

The following measurements and evaluation tests were conducted on the non-woven fabric for skin application of Examples and Comparative Examples obtained as described above. In FIG. 1 and FIG. 2, the structure and test result of the nonwoven fabric for skin sticking which concern on an Example and a comparative example are shown.

<Measurement and evaluation test items>
I. Basis weight Basis weight was measured according to Japanese Industrial Standards JIS P8124 “Paper and paperboard—Method of measuring basis weight”.

II. Thickness The thickness was measured in accordance with Japanese Industrial Standard JIS P8118 “Paper and paperboard—Test method for thickness and density”.

III. Wet tensile strength The wet tensile strength in the machine direction (MD) was measured according to Japanese Industrial Standard JIS P8135 “Paper and paperboard—wet tensile strength test method”.

Since the non-woven fabric for skin application is used with a chemical solution or lotion, it has wet tensile strength as one of the required qualities related to the application. The wet tensile strength is preferably as large as possible so long as the sticking property is not adversely affected. In this example, the wet tensile strength specification was set to 12.0 N / 100 mm or more, and a sample satisfying this specification was subjected to an evaluation test. The wet tensile strength was ensured by adjusting the amount of aqueous binder sprayed.

IV. Stiffness (Rigidity)
Stiffness was measured in accordance with the handle ohmmeter method of Japanese Industrial Standard JIS L1096 “Textile and Textile Fabric Testing Method”. It shows that rigidity is so high that rigidity is large.

The non-woven fabric to be applied to the skin is used after being applied with a chemical solution or a lotion, and is used by being applied to the skin, and therefore has an appropriate rigidity as one of the required qualities related to the application. On the premise that the range is easy to handle, the stiffness (rigidity) was evaluated to be better as it was smaller (lower) from the viewpoint of the ability to follow the undulation of the pasted site.

V. Water absorption time (liquid retention)
In accordance with the method for measuring sedimentation velocity shown in item 6 (1) of the Ministry of Health, Labor and Welfare “Medical Gauze / Medical Absorbent Cotton Standard” (see attached sheet of No. 0600011 dated June 30, 2005) The time taken for the basket containing the sample to fall into the water and sink below the water surface was measured, and this was taken as the water absorption time. The water absorption time of 5 seconds or less was defined as the required quality related to the use of the non-woven fabric for skin application. It was evaluated that the shorter the water absorption time, the higher the water absorption and the better the liquid retention.

VI. Sticking property As the sticking property of the skin-bonding nonwoven fabric, the skin sensation and appearance (fit feeling) when the skin-bonding nonwoven fabric was pasted were evaluated in five levels by a sensory test by five users.

Specifically, first, a sample having a size of 100 × 100 mm was folded in eight, and 10 g of a commercially available cosmetic liquid was added to infiltrate uniformly. Next, the sample that had been folded after penetration was affixed to the skin at the base of the arm, and the degree of adhesion was judged from the skin sensation and appearance (fitness). It evaluated that sticking property was so favorable that the adhesion degree was large. The average score of 5 users was calculated with 5 being the best and 1 being the worst, and the rating was expressed as an integer from 5 to 1.

<Evaluation>
In each of the examples and comparative examples, the water absorption time was 5 seconds or less, which were substantially side by side, and satisfied the set required quality. On the other hand, regarding the sticking property, the comparative example was evaluated 3 or 2, whereas in all examples, better evaluation 4 or evaluation 5 was obtained.

As a sample in which the glass transition temperature (Tg) and basis weight of the aqueous binder are the same and the thickness before including the liquid is different, Example 1 (0.23 mm), Example 2 (0.74 mm), and comparison Example 3 (1.02 mm) was compared. Comparative Example 3 having a thickness exceeding 1 mm had high rigidity and poor sticking property. In Example 1 and Example 2, as the thickness before including the liquid was smaller, the stiffness was smaller and the sticking property was better. *

Example 3 (Tg 4 ° C.) and Comparative Example 2 (Tg 20 ° C.) were compared as samples in which the glass transition temperature (Tg) of the aqueous binder was different and the basis weight and the thickness before including the liquid were the same. Although the rigidity was comparable, the sticking property by sensory evaluation was evaluation 4 better than that of Example 3 to evaluation 3 of Comparative Example 2.

Similarly, as a sample in which the glass transition temperature (Tg) of the aqueous binder is different and the basis weight and the thickness before including the liquid are the same, Example 2 (Tg-19 ° C.) and Comparative Example 1 (Tg 14 ° C.) Compared. Example 2 was less rigid than Comparative Example 1 and had good stickiness by sensory evaluation (Comparative Example 1 was evaluated 3 whereas Example 2 was better than that) Evaluation 4).

The non-woven fabric for skin application of the present invention has both good liquid retention and sticking properties, and is suitably used for medical purposes, cosmetic purposes, etc. for absorbing and adhering liquids such as chemicals and lotions. be able to.

Claims

A non-woven fabric for skin application provided for use with a liquid, including an aqueous binder having a glass transition point of 10 ° C. or lower, a basis weight of 20 g / m 2 or more and 80 g / m 2 or less, and including a liquid A non-woven fabric for skin application, having a thickness of 1 mm or less before being applied.
The skin-bonding nonwoven fabric according to claim 1, wherein the aqueous binder is an ethylene vinyl acetate copolymer.
The skin adhesive according to claim 1 or 2, wherein the skin adhesive nonwoven fabric is a dry nonwoven fabric obtained by joining a plurality of fiber sheets formed by an airlaid method with an aqueous binder and then compressing the same. Wear non-woven fabric.
The non-woven fabric for skin application according to any one of claims 1 to 3, wherein the non-woven fabric for skin application is mainly composed of cellulosic fibers.
The said skin sticking nonwoven fabric contains a cellulosic fiber in the quantity of 50 mass% or more on the basis of the total mass of the skin sticking nonwoven fabric, It is any one of Claim 1 to 4 characterized by the above-mentioned. Non-woven fabric for skin application.
The skin adhesive nonwoven fabric according to any one of claims 1 to 5, wherein the skin adhesive nonwoven fabric contains the aqueous binder in an amount of 5% by mass to 30% by mass.
The step of forming a plurality of fiber sheets by the airlaid method and the formed plurality of fiber sheets are bonded to each other with an aqueous binder having a glass transition point of 10 ° C. or less, and the basis weight is 20 g / m 2 or more and 80 g / m 2. A method for producing a skin-bonding nonwoven fabric, comprising: a step of obtaining the following dry nonwoven fabric; and a step of compressing the obtained dry nonwoven fabric so that the paper thickness is 1 mm or less.