JPH09249526A - Adhesive sheet for removing square plugs - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a pressure-sensitive adhesive sheet for removing corneal plugs for the purpose of improving the skin-beautifying effect by removing the corneal plugs clogging the pores of the skin such as around the nose and chin by the adhesive force of the adhesive. SOLUTION: One side of a flexible support made of a laminated film of a polyethylene film and an acrylic modified polyethylene film or a polyurethane-based single layer film is attached to one side.
An acrylic pressure-sensitive adhesive layer having a thickness of 5 to 100 μm is formed.
20% modulus as an adhesive sheet is 3kg / 20m
By setting the width to be less than or equal to m, excellent skin adhesion and keratin plug removability can be exhibited.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the removal of keratin plugs for the purpose of providing beautiful skin having a function of removing keratin fragments, sebum, dirt and the like clogged in the pores of the face, particularly around the nose and chin, by the adhesive force of the adhesive. For pressure-sensitive adhesive sheet.

[0002]

2. Description of the Related Art Pack cosmetics are one type of cosmetics and are usually used for removing skin stains such as the face and old stratum corneum. However, since there are countless pores in the skin, fragments of the old stratum corneum (horn pieces) are mixed with sebum secreted from the skin or mixed with dirt and clogged in the pores to form so-called horn plugs. When a keratotic plug is formed in the pores, the skin surface becomes black and rough, and in some cases, skin disorders such as acne may occur.

Conventionally, as methods for removing such keratin plugs, sebum and dirt on the face, a pack method in which a liquid component is applied to the face to raise the dirt and then rinsed or wiped off, and a film is formed by drying. There is a pack method in which a liquid component that becomes solid is applied to the face and dried to remove the film formed. In such a packing method, since the liquid component is applied by fingers, there are problems that the fingers are contaminated and that it takes time to wash it off and remove the film. Also, in the latter method, the so-called peel-off type pack, since the film adheres to the skin,
Even the normal stratum corneum may be exfoliated during exfoliation, which may cause pain during exfoliation or may cause tingling sensation after exfoliation. In particular, when the normal peeling of the stratum corneum is repeated, skin irritation such as redness occurs, so that the intended effect of beautiful skin cannot be obtained and pigmentation may sometimes occur.

Further, a face-adhesive type pack in which a water-containing gel adhesive layer is formed on a base material sheet such as a non-woven fabric has been proposed, but such a type pack focuses on the moisturizing effect. However, it is difficult to reliably remove even dirt on pores by simply removing dirt on the skin surface.

[0005]

SUMMARY OF THE INVENTION Therefore, the inventors of the present invention have problems with the conventional packs for removing keratin plugs, such as contamination of hands and fingers, removal of keratin plugs by time, and peeling of the film. As a result of extensive studies to eliminate the occasional pain and the inability to remove the keratin plug sufficiently, as a result, an adhesive sheet-like pack using a specific support and an acrylic adhesive as an adhesive It was found that by using, it is possible to easily remove keratin plugs on the face, especially around the nose and chin,
The present invention has been completed.

[0006]

That is, according to the present invention, a laminated film of a polyethylene film and an acrylic modified polyethylene film, or a flexible support having a thickness of 20 to 150 μm and made of a polyurethane-based monolayer film is provided on one surface of a support.
It is intended to provide a pressure-sensitive adhesive sheet for removing corrugated plugs, which comprises an acrylic pressure-sensitive adhesive layer having a thickness of 5 to 100 μm and has a 20% modulus in one direction of 3 kg / 20 mm width or less.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The support used in the pressure-sensitive adhesive sheet for removing square plugs of the present invention comprises a laminated film of a polyethylene film and an acrylic modified polyethylene film, or a polyurethane single layer film. When the adhesive sheet is applied to the skin surface, it has the flexibility to follow irregularities and curved surfaces of the skin.

The laminated film of the polyethylene film and the acrylic modified polyethylene film used as the support in the present invention is, for example, a two-layer film of ethylene / methyl methacrylate copolymer and polyethylene, or ethylene on both sides of the polyethylene film. / Three-layer film in which films of ethylene / methyl methacrylate copolymer and ethylene ionomer / methyl methacrylate copolymer are laminated, polyethylene on both surfaces of ethylene / methyl methacrylate copolymer and ethylene ionomer / methyl methacrylate copolymer film Examples include a three-layer film in which films are laminated. Since a monolayer film made of polyethylene alone is difficult to stretch and easily causes necking, the above polyethylene-based laminated film is used in the present invention.

As the polyurethane single layer film, it is preferable to use a single layer film made of polyester urethane or polyether urethane. These supports are preferably used in the form of a non-porous film from the viewpoint of mechanical strength.

Further, it is effective that the above-mentioned support is transparent or translucent in order to make the keratin plug removed from the skin surface easily visible.

The thickness of the support is 20 to 150 μm, preferably about 25 to 100 μm. When the thickness of the support is less than 20 μm, the self-supporting property of the pressure-sensitive adhesive sheet for removing keratin plug of the present invention, which is finally obtained, is poor (so-called “stiff”), and the operability of application is poor, and the application of application is poor. At times, the problem of sticking of the adhesive surfaces easily occurs.
On the other hand, when the thickness of the support is more than 150 μm, the sticking operability is improved, but the flexibility is deteriorated, and a feeling of discomfort is generated during sticking, and the followability to the curved surface of the skin is deteriorated.

In the present invention, the pressure-sensitive adhesive layer for removing square plugs formed on one surface of the above-mentioned support is formed of an acrylic pressure-sensitive adhesive with a thickness of 15 to 100 μm, preferably 20 to 60 μm. As the acrylic adhesive that can be used, specifically, a (meth) acrylic acid alkyl ester having an alkyl group having 1 to 14 carbon atoms, a vinyl monomer having a functional group in a side chain and / or an acrylic The thing which consists of a copolymer with a system monomer can be used conveniently.

The above-mentioned (meth) acrylic acid alkyl ester is a monomer for imparting tackiness as a pressure-sensitive adhesive, and for example, (meth) acrylic acid methyl ester, (meth) acrylic acid ethyl ester, (meth) Acrylic acid propyl ester, (meth) acrylic acid butyl ester,
(Meth) acrylic acid pentyl ester, (meth) acrylic acid hexyl ester, (meth) acrylic acid heptyl ester, (meth) acrylic acid octyl ester, (meth) acrylic acid nonyl ester, (meth) acrylic acid decyl ester, (meth ) Acrylic acid dodecyl ester,
(Meth) acrylic acid undecyl ester, (meth) acrylic acid tridecyl ester and the like can be used.
The alkyl group in the (meth) acrylic acid alkyl ester may be linear or branched. Among these (meth) acrylic acid alkyl esters, an alkyl group having 4 or more carbon atoms from the viewpoint of non-irritancy to the skin surface and adhesiveness (adhesiveness), particularly preferably from the viewpoint of adhesiveness (Meth) acrylic acid isooctyl ester,
It is preferable to use (meth) acrylic acid alkyl ester having about 6 to 10 alkyl groups such as (meth) acrylic acid 2-ethylhexyl ester and (meth) acrylic acid isononyl ester.

On the other hand, the vinyl-based and / or acrylic-based monomer having a functional group copolymerizable with the above-mentioned (meth) acrylic acid alkyl ester imparts appropriate cohesiveness to the pressure-sensitive adhesive layer formed on one surface of the support. A monomer for
For example, vinyl acetate, vinyl propionate, N-vinylpyrrolidone, acrylic acid, methacrylic acid, itaconic acid,
Maleic acid, acrylamide, methacrylamide, etc. can be used alone or in combination of two or more.

These monomers are copolymerized in the range of 0.5 to 20% by weight, preferably 1 to 10% by weight, based on the total monomers containing the above-mentioned (meth) acrylic acid alkyl ester. If the copolymerization amount is less than 0.5% by weight, sufficient cohesive force as a pressure-sensitive adhesive may not be imparted, and as a result,
At the time of exfoliation, the normal stratum corneum may be exfoliated and painful. Further, when the copolymerization amount exceeds 20% by weight, the cohesive force becomes unnecessarily high and the tackiness decreases, so that the horn plugs in pores may not be surely tacked and removed.

The pressure-sensitive adhesive used in the present invention is composed of a copolymer using the above-mentioned monomer, but considering the points of adhesion and cohesiveness to the skin surface, skin irritation and non-irritancy to the skin. The weight average molecular weight is preferably 100,000 or more, and the glass transition temperature (Tg) of the adhesive is 2
It is preferable to adjust the temperature to 50 ° K or less.

When the pressure-sensitive adhesive layer is formed on one surface of the support, the pressure-sensitive adhesive layer-forming surface of the support may be subjected to corona discharge treatment or primer treatment in order to improve anchoring properties with the support. preferable.

The pressure-sensitive adhesive sheet for removing plugs according to the present invention has the above-mentioned constitution and has a 20% modulus in one direction of 3 k.
It is an essential requirement that the width is g / 20 mm or less, and a preferable range is 0.1 to 1.0 kg / 2.
A range of 0 mm width is preferable. The modulus value is 3 kg / 20
If the width exceeds mm, a discomfort (stiffness) will occur when it is applied to the skin surface as a pressure-sensitive adhesive sheet for removing plugs.
Sufficient adhesion may not be obtained to the uneven parts such as the nose, and the desired keratin plug may not be reliably removed. That is, since the pressure-sensitive adhesive sheet for removing plugs of the present invention has the above-mentioned modulus value in one direction, it has appropriate flexibility and exhibits appropriate elongation, and has the effect of being able to be attached to the uneven portion with good adhesiveness without a feeling of discomfort. It is something to demonstrate. If desired, various heat stabilizers, ultraviolet light stabilizers, pigments and the like can be added to the support, and the back surface of the support can be subjected to surface treatment such as various printing and release treatment.

In order to prevent the contamination of the surface of the pressure-sensitive adhesive layer, it is preferable that the pressure-sensitive adhesive layer of the present invention is coated with a separator until the surface of the pressure-sensitive adhesive layer, and the separator is peeled and removed before use. Then, the sheet is attached to the target site, the keratin plug is sufficiently adhered, and then the sheet is removed. In addition, in using the pressure-sensitive adhesive sheet of the present invention, it is preferable to perform punching in accordance with an arbitrary position to be attached in advance from the viewpoint of ease of use.

[0020]

EXAMPLES Examples of the present invention will be shown below, and will be described more specifically. In the following text, “part” means “part by weight”.

Example 1 A monomer mixture consisting of 90 parts of 2-ethylhexyl acrylate, 5 parts of acrylate ethyl ester, and 5 parts of acrylic acid was copolymerized in ethyl acetate to give a glass transition temperature of 210 ° K and weight. A solution of an acrylic adhesive having an average molecular weight of 620,000 was prepared.

The resulting acrylic pressure-sensitive adhesive solution was applied onto a separator so that the thickness after drying was 30 μm, and dried to form a pressure-sensitive adhesive layer.

Next, the above-mentioned pressure-sensitive adhesive layer was transferred and laminated on one surface of a polyester urethane film (thickness: 50 μm) as a support to prepare the pressure-sensitive adhesive sheet for removing keratin plug of the present invention.

Example 2 As a support, a three-layer film (total thickness 80 μm) in which a 25 μm-thick ethylene / methyl methacrylate copolymer film is laminated on both sides of a 30 μm-thick polyethylene film
The acrylic pressure-sensitive adhesive layer was laminated in the same manner as in Example 1 except that the above was used to prepare the pressure-sensitive adhesive sheet for removing square plugs of the present invention.

Comparative Example 1 An acrylic pressure-sensitive adhesive layer was laminated in the same manner as in Example 1 except that a polyethylene terephthalate film having a thickness of 25 μm was used as a support to prepare a pressure-sensitive adhesive sheet for removing corrugated plugs.

Comparative Example 2 100 parts of natural rubber, 80 parts of terpene resin, 50 parts of zinc white
Part of the rubber-based pressure-sensitive adhesive solution dissolved in toluene is applied onto the separator so that the thickness after drying is 50 μm,
It dried and formed the adhesive layer. The obtained pressure-sensitive adhesive layer was transferred and laminated on one surface of the support used in Example 2 to prepare a pressure-sensitive adhesive sheet for removing keratotic plugs.

The following tests were conducted on the pressure-sensitive adhesive sheets for removing keratin plugs obtained in the above Examples and Comparative Examples, and the results are shown in Table 1.

<20% modulus and elongation> JIS
20% modulus and elongation were measured according to K7311.

<Adhesiveness> Attach each adhesive sheet to the nose,
After 30 seconds, it was peeled off and the removability of the horn plug was determined according to the following criteria. ：: It was confirmed that the square plug was removed. X: It was not possible to sufficiently confirm that the horn plug was removed.

<Adhesive Remaining> Each adhesive sheet is attached to the nose,
After 30 seconds, the adhesive was peeled off, and the state of the adhesive residue after peeling was determined according to the following criteria. ：: No adhesive residue phenomenon was observed at the sticking site. X: Adhesive adhesive residue phenomenon was observed at the applied site.

<Feeling of sticking> Sticking each adhesive sheet on the nose,
Uncomfortable feeling until peeling and removing after 30 seconds was determined according to the following criteria. ：: No discomfort was felt during application. X: A feeling of strangeness was felt during application.

<Pain during peeling> Each adhesive sheet was attached to the nose and peeled off after 30 seconds, and the pain during peeling was judged according to the following criteria. ：: I did not feel much pain. X: I felt pain.

[0033]

[Table 1]

[0034]

INDUSTRIAL APPLICABILITY As described above, the pressure-sensitive adhesive sheet for removing keratin plugs of the present invention is excellent in flexibility and tackiness because it has a specific film as a support and an acrylic pressure-sensitive adhesive layer laminated on the film. The square plugs of the pores of the skin, especially of the nose can be reliably removed and the skin-beautifying effect is excellent.

Further, since the pressure-sensitive adhesive sheet of the present invention can adhesively remove only corneal plugs without peeling normal keratin, it can exert an effect of not irritating the skin surface and having less irritation.

Front page continued (72) Inventor Hiroaki Sasaki 1-2 1-2 Shimohozumi, Ibaraki City, Osaka Prefecture Nitto Denko Corporation (72) Inventor Yoshio Matsumoto 2-11-10 Higashiobashi, Higashinari-ku, Osaka City, Osaka Inside Shiseido Viewtech Co., Ltd. (72) Inventor Yuriko Hamaguchi 2-11-10 Higashiobashi, Higashinari-ku, Osaka City, Osaka Prefecture Inside Shiseido Viewtech Co., Ltd.

Claims (3)

[Claims] 1. An acrylic pressure-sensitive adhesive layer having a thickness of 15 to 100 μm is formed on one side of a flexible support having a thickness of 20 to 150 μm, which is a laminated film of a polyethylene film and an acrylic modified polyethylene film, or a polyurethane type single layer film. The pressure-sensitive adhesive sheet for removing corrugated plugs, which has a unidirectional 20% modulus of 3 kg / 20 mm or less. 2. The acrylic adhesive has a weight average molecular weight of 10.
The pressure-sensitive adhesive sheet for removing corrugated plugs according to claim 1, which has a glass transition temperature of 250 ° K or lower. 3. An acrylic pressure-sensitive adhesive comprising an alkyl (meth) acrylate having an alkyl group having 1 to 14 carbon atoms, and a vinyl monomer and / or an acrylic monomer having a functional group in a side chain. A pressure-sensitive adhesive sheet for removing keratin plug according to claim 1, which is made of the copolymer of