JP2007176860A - Cornoid lamella-removing sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a cornoid lemella-removing sheet even easier to visually recognize cornoid lemella removed from the skin with no need of bringing a color pigment in a wet adhesive to high concentrations. <P>SOLUTION: The cornoid lemella-removing sheet is obtained by holding, in a colored moisture-permeable holding material, the wet adhesive comprising (A) a water-soluble polymer that exhibits adhesivity in the presence of an aqueous medium, (B) a liquid plasticizer, (C) a filler and (D) the color pigment. In this cornoid lemella-removing sheet, it is preferable that the color pigment be e.g. black iron oxide, red iron oxide, carbon black, ultramarine, iron blue pigment, and the moisture-permeable holding material be a nonwoven fabric. Besides, it is preferable that the L-values and the b-values of the moisture-permeable holding material and the wet adhesive layer in the L*a*b* color specification system be 50 or less and 10 or less, respectively. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a square plug removal sheet that can efficiently remove square plugs formed in pores.

  The horn plugs formed around the nose and the like are keratinized with dirt and clogged with pores. If this is left as it is, the pores become conspicuous, which is not preferable for cosmetic purposes. In order to remove this square plug, it has been proposed to use a water-soluble polymer that exhibits adhesiveness in the presence of an aqueous medium. In this case, the wet pressure-sensitive adhesive containing a water-soluble polymer is generally held on a nonwoven fabric or the like, and in use, the nose is wetted with a small amount of water and is brought into contact with the face in a state where the pressure is applied. (For example, refer to Patent Documents 1 to 5).

  Recently, a sheet-like patch using a wet pressure-sensitive adhesive containing a black pigment has been proposed in order to make it easy to visually identify a horn plug removed from the skin (Patent Document 5).

  However, if the wet adhesive contains a black pigment, the skin may be dyed black. In order to reduce this, the pigment concentration may be lowered, but if this is done, a sufficient discrimination effect of the square plug cannot be obtained.

Japanese Patent Laid-Open No. 5-97627 JP-A-10-59819 Japanese Patent Laid-Open No. 11-12127 JP 2001-89352 A JP 2005-255637 A

  Therefore, the present invention provides a horn plug removal sheet that does not require a high concentration of a color pigment such as a black pigment in a wet adhesive, and that makes it easier to visually identify horn plugs removed from the skin. Objective.

  The present invention contains, in a colored moisture-permeable holder, (A) a water-soluble polymer that exhibits adhesiveness in the presence of an aqueous medium, (B) a liquid plasticizer, (C) a filler, and (D) a coloring pigment. The present invention provides a square plug removal sheet in which a wet pressure-sensitive adhesive is retained.

  In the square plug removal sheet of the present invention, since both the moisture-permeable holding body and the wet adhesive are colored, the square plug removed from the skin can be easily identified. Moreover, the skin residue of a coloring pigment can be decreased by making the coloring pigment density | concentration in a wet adhesive low.

  The water-soluble polymer (A) of the present invention that exhibits adhesiveness due to the presence of the aqueous medium swells or dissolves in contact with the aqueous medium, enters the pores, and then dries to form a film with high film strength. It exfoliates and removes horn plugs in the skin. Specifically, anionic, cationic or amphoteric salt-forming groups described in Patent Document 1, more specifically carboxyl groups, sulfonic acid residues, sulfuric acid residues, phosphoric acid residues, nitric acid Examples thereof include polymer compounds having a salt-forming group such as a residue, an amino group, and an ammonium group, and polyvinyl pyrrolidone and vinyl pyrrolidone-vinyl acetate copolymers mentioned in Patent Document 2. In particular, polymethacryloyloxyethyltrimethylammonium chloride is preferable in terms of excellent ability to remove horn plugs.

  The (B) liquid plasticizer of the present invention is compatible with Component A and exhibits the plasticizing effect of the film formed from Component A. Specific examples include polyols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, glycerin, sorbitol, mannitol, xylitol, and maltitol. It is done.

  (B) The liquid plasticizer is preferably used in an amount of 1 to 75 parts by mass, and more preferably 5 to 50 parts by mass with respect to 100 parts by mass of Component A.

  The filler (C) of the present invention is an inorganic or organic substance that is hardly soluble or insoluble in the mixture of the component A and the component B, and is obtained by removing the color pigment. The elastic modulus of the agent is adjusted to adjust the ability to remove the horn plug. Here, the wet pressure-sensitive adhesive liquid refers to a liquid in which an aqueous medium is appropriately added to the wet pressure-sensitive adhesive to facilitate application to the moisture-permeable holding body. As the filler, any of particulate, fibrous, and flaky forms can be used, and as the particulate form, silica, calcium carbonate, clay, titanium oxide, magnesium carbonate, etc .; as the fibrous form, glass fiber, carbon fiber, etc. However, examples of flakes include mica.

  (C) The filler is preferably used in an amount of 10 to 200 parts by mass, and more preferably 25 to 120 parts by mass with respect to 100 parts by mass of Component A.

  The colored pigment (D) of the present invention is an inorganic or organic powdery substance that does not dissolve in water, oil, or solvent, does not dissolve in sweat or sebum, and does not stain the skin. The colored pigment in the present invention refers to a chromatic or black pigment and does not include extender pigments and white pigments. Specific examples include black iron oxide, black titanium oxide, medicinal charcoal, bengara, carbon black, ultramarine, bitumen, and various lakes. From the viewpoint that the color of the square plug is yellow or white and can be identified, black pigments such as black iron oxide and carbon black, and blue pigments such as bitumen, ultramarine, and blue No. 1 aluminum lake are preferable. .

  (D) The coloring pigment is preferably used in an amount of 0.1 to 20 parts by weight, more preferably 1 to 10 parts by weight, based on 100 parts by weight of Component A. Two or more of these pigments can be mixed and used.

  The wet pressure-sensitive adhesive of the present invention contains the components (A) to (D), and an aqueous medium is appropriately added to form a wet pressure-sensitive adhesive liquid. It is a plug removal sheet. Here, the aqueous medium refers to water and water obtained by appropriately adding a volatile hydrophilic solvent such as ethanol.

  In addition to the above components, various oils can be added to the wet pressure-sensitive adhesive of the present invention in order to adjust the pressure-sensitive adhesive force and peel strength. Specifically, hydrocarbon oils such as liquid paraffin, squalane and petrolatum, natural oils such as olive oil, jojoba oil and evening primrose oil, ester oils such as isopropyl myristate, cetyl isooctanoate and neopentyl glycol dicaprate, methylsilico -Silicone such as-, methylphenyl silicone, polyether-modified silicone and amino-modified silicone can be used.

  The colored moisture-permeable holding body of the present invention is a sheet having moisture permeability, and holds the wet pressure-sensitive adhesive composition on one side thereof. Specific examples include woven fabrics, nonwoven fabrics, knitted fabrics, etc., but nonwoven fabrics are preferred from the standpoint of following a three-dimensional shape. In the case of a non-woven fabric, various synthetic or natural polymers such as nylon, polyester, polyethylene, and polypropylene can be used.

  Moreover, as described in Patent Document 3, the moisture-permeable holding body may be a two-layer type including, for example, a water-repellent layer made of polypropylene fibers and a hydrophilic layer made of polypropylene fibers and rayon fibers. In this case, the wet adhesive composition is held in the hydrophilic layer. The hydrophilic layer can be easily dyed with a dye and is suitable for coloring a colorless moisture-permeable holding body.

  The thickness of the moisture-permeable holding body is preferably 170 to 1000 μm, more preferably 200 to 1000 μm. Furthermore, as described in Patent Document 4, the moisture-permeable holding body is, for example, a first water-repellent layer made of polypropylene fibers, a hydrophilic layer made of polypropylene fibers and rayon fibers, and a second water-repellent layer made of polyester fibers. A three-layer type composed of layers can also be used. The method for producing the nonwoven fabric is not particularly limited, and examples thereof include a heat embossing method, an air-through method, a spunlace method, and a needle punch method, and a combination of these methods or the above-described two-layer type or three-layer type may be used.

  For the hydrophilic layer, natural fibers such as cotton, hemp, and wool, and purified cellulose fibers such as acrylic fibers, lyocell fibers, and tencel fibers may be used. Further, the synthetic fiber may be subjected to a hydrophilic treatment.

  The form of the fiber can be a single, core-sheath composite, side-by-side composite fiber, or the like.

  The cross-sectional shape of the fiber is not particularly limited, and is not limited to a circular cross-section, and may be a cross-section having a triangular shape, a star shape, a four-leaf shape, a cloud shape, a C shape, a β shape, or the like, or a hollow shape.

  The fiber diameter is preferably 0.55 to 6.6 dtex, more preferably 1.1 to 5.5 dtex, from the viewpoint of softening the texture of the moisture-permeable holding body.

The basis weight of the moisture-permeable holding member, preferably to 15 to 100 / ^{m 2,} and more preferably set to 20 to 80 g / ^{m 2.} When the basis weight is within this range, the wet pressure-sensitive adhesive does not ooze out to the surface opposite to the wet pressure-sensitive adhesive holding surface of the moisture-permeable holding body, and the moisture-permeable holding body has an outer shape on the skin application surface. It is easy to get used to and is economically advantageous.

  The porosity of the moisture-permeable holding body is preferably 70 to 99%, and more preferably 85 to 99%. If it is this range, drying of a wet adhesive will be quick, and sufficient film strength of a wet adhesive can be obtained. Here, the porosity is a value calculated by the following equation.

Porosity (%) = ((ρ−ρ ′) / ρ) × 100
(ρ represents the true specific gravity of the moisture-permeable holder, and ρ ′ represents the apparent specific gravity of the moisture-permeable holder)
The moisture permeability of the moisture-permeable holding body is preferably 100 to 10,000 g / m ² · 24 hr in the measurement method according to JIS Z0208. If it is within this range, the air permeability is good and the wet adhesive dries quickly, and the wet adhesive liquid oozes out from the moisture permeable holder when the wet adhesive liquid is applied to the moisture permeable holder during the production of the wet adhesive. Production of the agent is not difficult.

  If it is in the above range, there is no risk that the wet adhesive will ooze out from the surface of the holding body during use and the problem such as smearing of the fingers will occur, or the tensile strength is not sufficient, so there is no risk of tearing or tearing during peeling. Sufficient followability to the skin is obtained.

  A colored moisture-permeable holding body can be obtained, for example, by dyeing a nonwoven fabric with a dye. Examples of the dye include acid dyes, mordant dyes, basic dyes, disperse dyes, direct dyes, sulfur dyes, vat dyes, sulfur vat dyes, izock dyes, reactive dyes, azo dyes, xanthene dyes, quinoline dyes Any of dyes, triphenylmethane dyes, anthraquinone dyes, indigo dyes, nitro dyes, pyrene dyes, nitroso dyes and the like can be used. The dyeing method is not particularly limited, and examples thereof include a batch type and a continuous type. As the dyeing machine, specifically, a beam dyeing machine is preferable. The dyeing concentration, temperature, pH, bath ratio, time, pressure, liquid flow direction, flow rate, water to be used, etc. may be appropriately determined depending on the fiber to be dyed, the nonwoven fabric and the amount thereof. In order to dye uniformly, an anionic dispersant, a nonionic leveling agent, or an anionic leveling agent may be used. A general surfactant may be used at the time of washing.

  The L value in the L * a * b * color system of the colored moisture-permeable holding body and the wet pressure-sensitive adhesive layer is preferably 50 or less, and the b value is preferably 10 or less. More preferably, both have an L value of 40 or less and a b value of 0 or less, and more preferably, both have an L value of 30 or less and a b value of 0 or less. In this case, the moisture-permeable holding body is preferably dyed in the same color as the wettable pressure-sensitive adhesive layer, specifically black or blue.

  The L value, a value, and b value in the L * a * b * color system indicate values measured using a colorimeter (Minolta CR-200). In addition, L value, a value, and b value of a wet adhesive layer apply | coat a wet adhesive liquid to a petri dish so that the thickness after drying may be set to 1 mm, and measure it after drying.

  The composition shown in Table 1 was stirred and dissolved and dispersed to prepare a wet adhesive solution. The obtained wet pressure-sensitive adhesive liquid was applied to a release-treated surface of a polypropylene film having a silicone treatment on one side so as to have a thickness of about 300 μm. After a multilayer nonwoven fabric (thickness 220 to 380 μm) was placed on the coated surface from the hydrophilic layer, the moisture was evaporated through a hot air drying oven at 80 ° C. The moisture content of the wet adhesive thus obtained was 16 to 22% by mass.

  Here, the nonwoven fabric was dyed as follows. In other words, the non-woven fabric is rewound onto a punching roll with a hole, set in a beam dyeing machine, and 4% of the azo dye (Ciba Specialty, Terasil Black BFE or Terasil Blue BLF) is added to the weight of the fiber to be dyed. The dye was passed through the nonwoven fabric using a pump at 130 ° C./30 minutes for dyeing. Then, it washed and dried 10 times with 90 degreeC warm water, and obtained the dyeing nonwoven fabric.

  The following items were evaluated based on the following evaluation criteria by five panelists. For adhesion of adhesive to fingers, visibility, skin residue, etc., after applying water to the nose of each paneler, press the wet adhesive layer surface of the above-mentioned square plug removal sheet onto the nose with a finger, about After drying for 10 minutes, it was peeled off and evaluated. The result was shown by the average value of the five evaluation points.

(Color unevenness)
The square plug removal sheet was observed from the wet adhesive side and evaluated according to the following criteria.
4: No color unevenness is observed at all.
3: Almost no color unevenness is observed.
2: Clear color unevenness is recognized.
1: Remarkable color unevenness is observed.

(Adhesive adhesion to fingers)
4: Adherence to the finger is not recognized at all.
3: Almost no adhesion to fingers.
2: Adherence to a clear finger is recognized.
1: Remarkable adhesion to a finger is recognized.

(Ease of seeing the removed square plug)
4: The horn plug is easily recognized with the naked eye.
3: It takes effort to recognize the horn plug with the naked eye.
2: It takes effort to recognize the horn plug with the naked eye, but it is recognized with a loupe.
1: It takes effort even with a loupe to recognize a horn plug.

(Adhesive skin residue)
4: No skin residue is observed.
3: Almost no skin residue is observed.
2: Obvious skin residue is recognized.
1: Remarkable skin residue is recognized.

Claims (3)

  A wet pressure-sensitive adhesive containing (A) a water-soluble polymer that exhibits adhesiveness due to the presence of an aqueous medium, (B) a liquid plasticizer, (C) a filler, and (D) a color pigment on a colored moisture-permeable holder. Retained square plug removal sheet.   The square plug removal sheet according to claim 1, wherein the moisture-permeable holding body is made of a nonwoven fabric.   The square plug removal sheet according to claim 1 or 2, wherein both the L value in the L * a * b * color system of the moisture-permeable holding body and the wet pressure-sensitive adhesive layer are 50 or less and the b value is 10 or less.