CN1993098A - sheet body cleansing material - Google Patents

Abstract

The present invention provides a sheet-like body cleansing material comprising a sheet made of a woven or nonwoven fabric and an aqueous cleansing solution containing 10 to 30 mass% of a surfactant and 10 to 25 mass% of ethanol, wherein the sheet-like body cleansing material contains 0.5 to 4g of the aqueous cleansing solution per 1g of the sheet.

Description

sheet body cleansing material

technical field

The present invention relates to a sheet-shaped body cleansing material which is used by adding water and lathering.

Background technique

Conventionally, a cleansing sheet is known in which a nonwoven fabric or the like is impregnated with a surfactant, and then foamed with water (Patent Document 1, Patent Document 2, and Patent Document 3). Since the sheet is used to massage the skin for cleansing, it needs to have appropriate strength and soft touch, and the cleanser containing surfactant must be a cleanser with low irritation and good foaming properties. However, the existing cleansing sheets may damage the skin by rubbing the skin excessively for cleansing, and cannot fully meet the needs.

These cleansing sheets are stored in overlapping sealed packages, and there are problems such as sticking of the sheets to each other and blistering when taken out during storage. These problems related to the appearance and convenience of the product will give consumers a very bad impression, so it is not ideal.

In addition, in general, high-concentration aqueous solutions of surfactants are highly viscous, making it difficult to impregnate tablets effectively during the manufacturing process.

Patent Document 4 describes a wet fiber sheet impregnated with a cleaning composition having a pH of 3 to 6 containing a specific amount of ethanol. However, this fiber sheet uses ethanol, benzoic acid, and parabens in combination for mold prevention, and when used for wiping applications such as wet tissues, it foams and is difficult to use.

Patent Document 1: Japanese Patent Laid-Open No. 2003-27094

Patent Document 2: Japanese Patent Laid-Open No. 2002-363063

Patent Document 3: Japanese Patent Laid-Open No. 2003-95861

Patent Document 4: Japanese Patent Application Laid-Open No. 11-99088

Contents of the invention

The present invention provides a sheet-shaped body cleansing material, which is obtained by impregnating an aqueous cleansing liquid containing 10-30% by mass of surfactant and 10-25% by mass of ethanol in a sheet made of woven or non-woven fabric The formed sheet-shaped body cleansing material contains 0.5 to 4 g of aqueous cleansing liquid per 1 g of the sheet.

The present invention relates to a sheet-shaped body cleansing material capable of suppressing foaming when the sheet is taken out of a container, excellent in touch on the skin, and good in use.

The inventors of the present invention have found that by impregnating woven or nonwoven fabrics with an aqueous cleaning solution containing a surfactant and ethanol at a specific ratio, foaming can be suppressed when each piece is taken out of the container, and the skin feels excellent. , A sheet-shaped body cleansing material with good usability.

The sheet-shaped body cleansing material of the present invention does not adhere to each other when the sheet is in the container, suppresses foaming when the sheet is taken out of the container, has excellent antiseptic effect, has excellent touch on the skin, and has a good feeling of use. At the same time, since the aqueous cleaning liquid has a low viscosity, the impregnation property of the liquid at the time of manufacture is excellent.

The surfactant used in the present invention may be any of foaming anionic surfactants, nonionic surfactants, and amphoteric surfactants suitable for use as body cleansers.

As anionic surfactants, for example, polyoxyalkylene alkyl ether sulfates, alkyl sulfates, alkyl ether carboxylates, fatty acid amide ether carboxylates, higher fatty acid salts, alkyl phosphate ester salts, N - Acyl amino acid salts, acylated isethionates, acylated taurates, N-alkylamide alkanol sulfates, polyoxyalkylene fatty acid amide ether sulfates.

The alkyl group or acyl group of these anionic surfactants is preferably a straight chain having 10 to 14 carbon atoms, and may contain an alkyl group branched by a part of methyl groups. In addition, some or all of the alkyl groups may be alkenyl groups. As the counter ion, alkali metals such as sodium and potassium are preferable.

Among these anionic surfactants, for example, the alkyl phosphate monoester salt represented by the general formula (1) and the alkyl phosphate diester salt represented by the general formula (2) contained in the alkyl phosphate ester salt are preferably expressed in a mass ratio of Alkyl phosphoric acid monoester salt: Alkyl phosphoric acid diester salt=60:40～100:0 contains.

(In the formula, R represents an alkyl group with an average carbon number of 9 to 15, X ¹ , X ² and X ³ represent a hydrogen atom or an alkali metal, and n represents a number of 0 to 5 representing the average number of moles of ethylene oxide added. )

Examples of nonionic surfactants include polyoxyalkylene alkyl ethers, polyoxyalkylene fatty acid esters, alkyl amine oxides, alkyl saccharates, sucrose fatty acid esters, glycerin fatty acid esters, Sorbitan fatty acid ester, polyoxyalkylene glycerol fatty acid ester, polyoxyalkylene sorbitan fatty acid ester, fatty acid alkanolamide, polyoxyalkylene cured castor oil, etc. The alkyl group or acyl group of these nonionic surfactants is preferably a straight chain having 10 to 14 carbon atoms, and may contain a part of methyl-branched alkyl groups.

Examples of the amphoteric surfactant include alkyldimethylcarbonylbetaine, alkyldimethylsulfobetaine, imidazolium betaine, fatty acid amide betaine and the like. The alkyl group or acyl group of these amphoteric surfactants is preferably a straight chain having 10 to 14 carbon atoms, and may contain a part of methyl-branched alkyl groups.

From the viewpoint of foaming properties, the aqueous cleaning solution used in the present invention preferably contains an anionic surfactant and an amphoteric surfactant. The mass ratio, anionic surfactant/amphophoteric surfactant, is preferably 1-10, more preferably 2-5.

The surfactant is contained in an amount of 10 to 30% by mass, preferably 15 to 30% by mass, of the entire composition of the aqueous cleaning solution. If it is less than 10% by mass, sufficient foaming cannot be obtained, and if it is greater than 30% by mass, the usability decreases or formulation is difficult.

In addition, the aqueous cleaning solution contains 10 to 25% by mass of ethanol, preferably 15 to 25% by mass of ethanol. If it is less than 10% by mass, the effects of low viscosity and anti-corrosion cannot be sufficiently obtained, and if it is more than 25% by mass, foaming during use will decrease.

Usually, surfactants form associations with higher order structures at high concentrations, increasing the viscosity of the cleaning solution. This is the cause of difficulty in handling during production and foaming during storage. Since the formation of surfactant aggregates can be suppressed by adding ethanol, it is considered that these problems have been solved.

The aqueous cleaning solution used in the present invention may contain a foam booster in addition to the surfactant. For foaming body washes, it is extremely important to ensure high foaming properties. Usually, adding ethanol lowers the foamability, but in the present invention, higher foamability can be achieved by adding a foam booster other than the surfactant.

As the foam booster, fatty acids, higher alcohols, alkyl glyceryl ethers, and the like can be used.

The fatty acid is preferably a fatty acid having 10 to 18 carbon atoms, and examples thereof include lauric acid, myristic acid, palmitic acid, stearic acid, and isostearic acid.

The higher alcohol is preferably an alcohol having 10 to 18 carbon atoms, for example, lauryl alcohol, cetyl alcohol, myristyl alcohol, stearyl alcohol, isostearyl alcohol, etc.

Examples of the alkyl glyceryl ether include ethers having a straight-chain or branched-chain alkyl or alkenyl group having 4 to 12 carbon atoms. For example, it is preferred to have n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, n-hexyl, isohexyl, n-heptyl, n-octyl, 2-ethylhexyl, n-nonyl, n-decyl An alkyl group having 4 to 12 carbon atoms such as n-dodecyl group or n-dodecyl group.

One or more of these foam boosters can be used, and from the viewpoint of foaming during use and quality maintenance during long-term storage, they are contained in an amount of 1 to 10% by mass, more preferably 2 to 10% by mass, in the entire composition of the aqueous cleaning solution. 5% by mass of foam booster.

The aqueous cleansing liquid used in the present invention may further contain a skin care agent. Examples of skin care agents include humectants such as polyhydric alcohols, sodium lactate, sorbitol, and sodium hyaluronate; fats and waxes derived from vegetable oils; hydrocarbons such as liquid paraffin and vaseline; sterols such as cholesterol and phytosterols class; fatty acid esters, etc.

These skin care agents can be used in one or more types, and are contained in the entire composition at 1 to 20% by mass, more preferably at 5 to 17% by mass, from the viewpoint of improving the usability.

In addition to the above ingredients, the aqueous cleaning solution may also contain fungicides such as 2,4,4'-trichloro-2'-hydroxydiphenyl ether and carbanilide; potassium glycyrrhizinate, acetic acid Anti-inflammatory agents such as tocopherol; preservatives such as methyl paraben, ethyl paraben, propyl paraben, butyl paraben, sodium benzoate, isopropyl cresol, etc.; Chelating agents such as ethylenediaminetetraacetic acid or its salts, hydroxyethyldiphosphonic acid or its salts; others, fragrances, cooling agents such as 1-menthol, pigments, ultraviolet absorbers, antioxidants, plant extracts, etc.

Thus, the water contained in the aqueous cleansing liquid which mainly contains a surfactant and which may contain various components is preferably 30 to 70% by mass.

The pH of the 20-fold water dilution of the aqueous cleansing solution used in the present invention is 3-12, more preferably 5-10, from the viewpoint of foaming during use and low skin irritation.

Adjustment of pH can be performed using the aqueous acid or alkali solution.

Here, the pH was measured using a pH meter at 25° C. for a diluted solution obtained by diluting the aqueous cleaning solution 20 times with ion-exchanged water.

The woven or nonwoven fabric used in the present invention is a material impregnated with the above-mentioned aqueous cleaning solution. For example, a nonwoven fabric, a woven fabric, a woven fabric, etc. which consist of hydrophilic fiber and/or hydrophobic fiber are mentioned. Examples of hydrophilic fibers include cellulose fibers, pulp, rayon, and acrylic resins, and examples of hydrophobic (synthetic) fibers include polyethylene, polypropylene, polyester, polyamide, polystyrene, nylon, and acetic acid. fiber etc.

As the above-mentioned woven fabric or nonwoven fabric, a nonwoven fabric composed of mixed fibers of ultrafine synthetic fibers and hydrophilic fibers is preferable. As the ultrafine synthetic fibers, ultrafine fibers or separated fibers (separated fibers) composed of fibers such as polyethylene, polypropylene, polyester, polyamide, polystyrene, nylon, and cellulose acetate are preferable. The fineness of the ultrafine synthetic fibers is preferably 0.1 to 3.3 dtex, more preferably 0.1 to 1.1 dtex. Here, dtex is the weight per unit length (10000m) of the fiber. The lower the number the finer the fiber.

Fibers having a fiber diameter of 10 μm or less are preferable from the viewpoint of good touch and increased foaming due to air entrapment.

In the case of isolated fibers, an isolated fiber whose fineness before division is 1.1 to 4.4 dtex and whose number of divisions is 4 to 22 is preferable from the viewpoint of foaming because the distance between fibers is narrowed.

In addition, examples of the hydrophilic fiber include cellulose fibers (cotton, pulp, rayon, cuprammonium fiber, tencel, Lyocel fiber, etc.), acrylic resin, and the like, and rayon is preferable.

The fiber length of the fiber is not limited, but it is preferably a fiber of 5 to 60 mm from the viewpoint of increasing density and foaming.

There is no limit to the shape of the fiber, and it can be changed within the range that does not affect the touch, such as triangle and star.

Considering the durability of the sheet and the touch of the skin, the mixing ratio of ultrafine synthetic fibers and hydrophilic fibers is preferably ultrafine synthetic fibers:hydrophilic fibers=20:80 (wt/wt), more preferably 40 : 60 (wt/wt) ~ 60: 40 (wt/wt).

The basis weight of the nonwoven fabric is preferably 30 to 100 g/m ² , more preferably 40 to 60 g/m ² .

In addition, the shape, size, etc. of the sheet are not limited, and a sheet having a shape of a circle, a square, or a rectangle can be selected according to the purpose.

From the viewpoint of use and portability, the thickness is preferably 0.1 to 4 mm, more preferably 0.2 to 3 mm. The thickness is a value measured under a load of 3.7 g/cm ² .

The density (apparent specific gravity) is preferably 0.01 to 0.3 g/cm ³ , more preferably 0.1 to 0.25 g/cm ³ , from the viewpoint of impregnation with the aqueous cleaning solution and foaming when water is added during use.

The body cleansing material of the present invention is preferably entrained with sufficient air when it is used for lathering with water in order to improve foamability and detergency. For this reason, the porosity represented by the following formula of the woven or nonwoven fabric is preferably 70 to 99%, more preferably 85 to 99%.

Porosity (%)=(1-(ρ’/ρ))×100

(In the formula, ρ: the specific gravity of the sheet, ρ': the apparent specific gravity of the sheet)

In the body cleansing material of the present invention, the distance between fibers of the nonwoven fabric is preferably 1 to 100 μm, more preferably 1 to 50 μm, from the viewpoint of excellent liquid impregnation and formation of finer foam.

The distance between fibers was calculated by the following method. Setting: the thickness of the non-woven fabric is L (cm), the weight per unit area is w (g/m ² ), the fineness of the constituent fiber i is Di (dtex), the weight ratio of the constituent fiber i is αi (%), The average diameter of the constituent fibers is Fd (μm), and the average distance Dp between fibers is represented by the following formula.

[number 1]

Average distance between fibers Dp = average distance between fiber centers Δ - average diameter Fd

$<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 10000</span>}<span\; class="notranslate">\; \&times;</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; w</span>}\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; p</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}\mathrm{<span\; class="notranslate">\; \&alpha;\; i</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; Di</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 0.5</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; Fd</span>}$

The fineness Di was determined by the type of each fiber using a differential scanning calorimeter, and calculated from the determined fiber density di (g/cm ³ ) and the diameter Fdi (μm) of the constituent fiber i by the following formula.

Di=1000000(cm)×sectional area (cm ² )×specific gravity (g/cm ³ )

＝1000000×π(Fdi/2) ² ×di

In addition, the nonwoven fabric is not limited to a single layer, and may be multilayered. When multiple layers are, for example, three layers, it is preferable to use a latent crimp fiber or the like in the middle layer and provide a buffer layer to squeeze out air, which further increases foaming.

The manufacturing method of the non-woven fabric is not limited. From the aspect of touch, in addition to the spunlace method (spunlace), wet spunbond method, thermal bond method (thermal bond), method, hot air method (air through), Resin bonding, etc.

In addition, it is also possible to provide a thick density gradient of fibers in the nonwoven fabric and perform patterning by embossing or the like, and it is also possible to provide high-density portions and low-density portions.

In the present invention, such a substrate is impregnated with the aforementioned aqueous cleaning solution. The impregnation rate is 0.5 to 4 g, preferably 1 to 3 g, more preferably 2 to 2.5 g per 1 g of the tablet.

The sheet-shaped body cleansing material impregnated with an aqueous cleansing liquid is used as a wet type cleansing material, and is preferably stored in a sealed package.

The sheet-shaped body cleansing material of the present invention is suitable for body cleansing, especially as a face washing material.

The sheet-shaped body cleansing material of the present invention foams when added with water, and the sheet is used to cleanse the body in a manner of massaging. For example, when using as a face-washing material, it is preferable to use by the following method.

First, take out 1 tablet and spread it out, while adding water a little at a time, knead the tablet lightly to make it fully foamed. Next, gently fold the foaming sheet in 4, massage the entire face gently and clear, and rinse the foam well. At this time, it is preferable not to wash too much forcefully so as not to irritate the skin.

Example

Sheet-shaped body cleansing materials (aqueous cleansing solution content: 2.3 g/g (sheet)) of the composition shown in Table 1 were produced, and foaming properties during use, skin feel, foaming when taken out, and viscosity were evaluated. The results are shown in Table 1 together.

(Evaluation method)

(1) Foaming properties when using, skin feel, and foaming when taking out:

A special representative adds an appropriate amount of water to each sheet-shaped body cleansing material to make bubbles, washes the face with this, and rinses with tap water. Sensory evaluation was performed on the foaming property at this time, the touch on the skin, and the foaming at the time of taking out, and the judgment was based on the following criteria.

(foaming properties, skin feel)

◎: very good

○: good

△: Normal

×: Poor

(foaming when taken out)

◎: None

○: Almost none

△: Yes

×: many

(2) Viscosity

Measured at 25°C using a BM/BL type viscometer manufactured by Tokimec Inc. As the rotor, No. 2 was used, and the rotation speed was 60 rpm.

Table 1 Example comparative example 1 2 3 1 2 3 4 Aqueous liquid (%) Polyoxyethylene(2) Alkyl(12,13) Ether Phosphoric Acid 15.0 15.0 15.0 5.0 30.0 15.0 15.0 Lauryl Hydroxysultaine 5.0 5.0 5.0 1.7 10.0 5.0 5.0 Lauric acid 1.0 1.0 1.0 1.0 1.0 1.0 1.0 myristic acid 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Glycerol mono-2-ethylhexyl ether 2.0 2.0 2.0 2.0 2.0 2.0 2.0 glycerin 15.0 - 20.0 15.0 15.0 15.0 15.0 Butanediol 6.0 6.0 6.0 6.0 6.0 6.0 6.0 Sodium Benzoate 0.3 0.3 0.3 0.3 0.3 0.3 0.3 pH adjuster Appropriate amount Appropriate amount Appropriate amount Appropriate amount Appropriate amount Appropriate amount Appropriate amount spices 0.2 0.2 0.2 0.2 0.2 0.2 0.2 ion exchange water 34.5 49.5 29.5 47.8 14.5 49.5 24.5 ethanol 20.0 20.0 20.0 20.0 20.0 5.0 30.0 pH of 20 times dilution in water (25°C) 7 7 7 7 7 7 7 non-woven fabric Ultrafine synthetic fiber: polyethylene-polypropylene separation fiber (fineness 0.14dtex) (%) 50 50 50 50 50 50 50 Hydrophilic fiber: rayon (fineness 1.7dtex) (%) 50 50 50 50 50 50 50 Porosity (%) 90.9 90.9 90.9 90.9 90.9 90.9 90.9 Average distance between fibers (μm) 4.9 4.9 4.9 4.9 4.9 4.9 4.9 Weight per unit area (g/m ² ) 55 55 55 55 55 55 55 Foaming during use ◎ ◎ ◎ x △ ◎ △ Skin feel when using ◎ ○ ○ x △ ○ x Blistering when taking out ◎ ◎ ◎ ◎ △ x ◎ Viscosity (mPa·s) twenty three 18 35 13 35 84 20

Claims (6)

1. A sheet-shaped body cleansing material, which is formed by impregnating an aqueous cleansing liquid containing 10 to 30% by mass of a surfactant and 10 to 25% by mass of ethanol in a sheet made of woven or nonwoven fabric The sheet-shaped body cleansing material of , which contains 0.5 to 4 g of an aqueous cleansing liquid per 1 g of the sheet. 2. sheet-shaped body cleansing material as claimed in claim 1, is characterized in that, water-based cleansing liquid contains anionic surfactant and amphoteric surfactant, and its mass ratio, i.e. anionic surfactant/amphoteric surfactant is 1 to 10. 3. The sheet-shaped body cleansing material according to claim 1 or 2, wherein the surfactant is an alkyl phosphate ester salt. 4. The sheet-shaped body cleansing material according to any one of claims 1 to 3, wherein the aqueous cleansing liquid contains 1 to 10% by mass of a foam booster other than a surfactant. 5. The sheet-shaped body cleansing material according to any one of claims 1 to 4, wherein the woven or non-woven fabric is a non-woven fabric made of mixed fibers of ultrafine synthetic fibers and hydrophilic fibers. cloth. 6. The sheet-shaped body cleansing material according to any one of claims 1 to 5, wherein the hydrophilic fibers are cellulose fibers.