JP4266191B2 - Sheet-like body cleaning material - Google Patents

Description

  The present invention relates to a sheet-like body cleaning material that is gentle to the skin and has a good feeling of use.

Conventionally, a cleaning sheet used by impregnating a nonwoven fabric with a surfactant and adding water to foam is known (Patent Document 1, Patent Document 2, Patent Document 3). Since the sheet is used to massage and clean the skin, it is necessary to have a moderate strength and a soft feel, and the detergent containing the surfactant should have low irritation and good foaming Is also necessary. However, the conventional cleaning sheet is not satisfactory because it may damage the skin if it is rubbed too much for cleaning.
JP 2003-27094 A Japanese Patent Laid-Open No. 2002-363063 JP 200395861 A

  An object of the present invention is to provide a sheet-like body cleaning material that has a gentle touch on the skin and a good usability.

  By impregnating a specific non-woven fabric with a weakly acidic aqueous cleaning liquid containing a surfactant, the present inventors can obtain a sheet-like body cleaning material that has a gentle touch to the skin and a good feeling to use. I found it.

  The present invention impregnates a non-woven fabric made of a mixed fiber of ultrafine synthetic fibers and cellulosic fibers with an aqueous cleaning solution containing a surfactant and diluted 20-fold with water and having a pH of 3 to 6.5. A sheet-like body cleaning material is provided.

  The sheet-like body cleaning material of the present invention has a gentle touch on the skin and a good feeling on use.

  The sheet-like body cleaning material of the present invention is obtained by impregnating a specific mixed fiber nonwoven fabric with a weakly acidic aqueous cleaning liquid containing a surfactant. The surfactant used in the present invention may be any anionic surfactant, nonionic surfactant, or amphoteric surfactant having foaming properties suitable for use as a body cleanser.

  Examples of the anionic surfactant include polyoxyalkylene alkyl (or alkenyl) ether sulfate, alkyl (or alkenyl) sulfate, ether carboxylate, amide ether carboxylate, higher fatty acid salt, alkyl phosphate ester salt, Examples thereof include N-acyl amino acid salts, acylated isethionate salts, acylated taurates, N-alkylamide alkanol sulfate esters, polyoxyalkylene fatty acid amide ether sulfates, and the like. Of these, alkyl phosphate ester salts are preferred, and in particular, general formulas (1) and (2):

(In the formula, R represents an alkyl group or an alkenyl group having an average carbon number of 9 to 15 and a branching ratio of 10% or more, X ¹ , X ² and X ³ each represents a hydrogen atom or an alkali metal, and n represents ethylene oxide. It is a number from 0 to 5 indicating the average number of moles added)
The polyoxyethylene alkyl ether phosphate represented by these is preferable.

  Nonionic surfactants include, for example, polyoxyalkylene alkyl ether, polyoxyalkylene fatty acid ester, alkylamine oxide, alkyl saccharide, sucrose fatty acid ester, glycerin fatty acid ester, sorbitan fatty acid ester, polyoxyalkylene glycerin fatty acid ester, polyoxy Examples include alkylene sorbitan fatty acid ester, fatty acid alkanolamide, polyoxyalkylene hydrogenated castor oil, and the like.

  Examples of amphoteric surfactants include carbobetaine, sulfobetaine, imidazolinium betaine, and amide betaine.

  Of these, anionic surfactants are particularly preferable from the viewpoint of foamability.

  One or more surfactants can be used, and 10 to 30% by mass, especially 15 to 25% by mass in the total composition of the aqueous cleaning liquid can provide sufficient foaming and good usability. preferable.

The aqueous cleaning liquid used in the present invention contains the above-mentioned surfactant, and has a pH of 3 to 6.5, preferably 5 to 6, in a 20-fold water dilution. If it is in this range, the irritation | stimulation at the time of applying to skin is low and preferable.
The pH may be adjusted using an acid or alkaline aqueous solution.
The pH is measured using a pH meter at 25 ° C. for a diluted solution obtained by diluting an aqueous cleaning solution 20 times with ion-exchanged water.

The aqueous cleaning liquid used in the present invention can further contain a foaming agent. As the foam booster, fatty acids, higher alcohols, alkyl glyceryl ethers and the like can be used.
As the fatty acid, those having 10 to 18 carbon atoms are preferable, and examples thereof include lauric acid, myristic acid, palmitic acid, stearic acid, and isostearic acid.
As the higher alcohol, those having 10 to 18 carbon atoms are preferable, and examples thereof include lauryl alcohol, cetyl alcohol, myristyl alcohol, stearyl alcohol, and isostearyl alcohol.
Examples of the alkyl glyceryl ether include those having a linear or branched alkyl group or alkenyl group having 4 to 12 carbon atoms. For example, n-butyl group, isobutyl group, tert-butyl group, n-pentyl group, isopentyl group, n-hexyl group, isohexyl group, n-heptyl group, n-octyl group, 2-ethylhexyl group, n-nonyl group , N-decyl group, n-dodecyl group and the like having an alkyl group having 4 to 12 carbon atoms are preferable.

  One or more types of foaming agents can be used, and 1 to 10% by mass, particularly 2 to 5% by mass in the total composition of the aqueous cleaning liquid is used to maintain foaming and long-term storage quality. It is preferable from the viewpoint.

The aqueous cleaning liquid used in the present invention can further contain a skin care agent. Skin care agents include humectants such as polyhydric alcohols, sodium lactate and sodium hyaluronate; hydrocarbons such as liquid paraffin and petrolatum, sterols such as cholesterol and phytosterols, and oily components such as animal and vegetable oils and ester oils. .
One or more kinds of these skin care agents can be used, and it is preferably contained in the total composition in an amount of 1 to 20% by mass, particularly 5 to 17% by mass in order to improve the feeling of use.

In addition to the above-mentioned components, the aqueous washing liquid further includes a bactericidal agent such as triclosan and trichlorocarbanilide; an anti-inflammatory agent such as potassium glycyrrhizinate and tocopherol acetate; methylparaben, ethylparaben, propylparaben, butylparaben, sodium benzoate, Preservatives such as isopropylmethylphenol; chelating agents such as ethylenediaminetetraacetic acid or salts thereof, hydroxyethanediphosphonic acid or salts thereof; other cooling agents such as fragrances and l-menthol, dyes, ultraviolet absorbers, antioxidants , Plant extracts, ethanol and the like.
Thus, it is preferable that the water contained in the aqueous washing | cleaning liquid which has surfactant mainly and may contain various components is 30-70 mass%.

In the present invention, the sheet-like base material impregnated with the aqueous cleaning liquid is a nonwoven fabric made of a mixed fiber of ultrafine synthetic fibers and cellulosic fibers.
As the ultrafine synthetic fibers, ultrafine fibers or split fibers made of hydrophobic fibers such as polyethylene, polypropylene, polyester, polyamide, polystyrene, nylon, acetate, etc. are preferable. The fineness of the ultrafine synthetic fiber is preferably 0.1 to 3.3 dtex, particularly preferably 0.1 to 1.1 dtex. Here, dtex is the weight per unit length (10000 m) of the fiber. The lower this number, the finer the fiber. When expressed in terms of fiber diameter, it is preferably 10 μm or less because the feel is good and foaming of the cleaning agent is increased by suitably entraining air during use.
In the case of split fibers, the fineness before split is preferably 1.1 to 4.4 dtex, and the split number is preferably 4 to 22 in terms of foaming because the distance between the fibers becomes narrow.

  The fiber length of the fibers is preferably 5 to 60 mm because of high density and foaming at the time of use. Further, the shape of the fiber can be changed within a range that does not affect the touch, such as a triangle or a star.

  Examples of cellulosic fibers include cotton, rayon, cupra, tencel, and lyocell, with rayon being particularly preferred.

The mixing ratio of ultrafine synthetic fiber and cellulosic fiber is as follows: ultrafine synthetic fiber: cellulosic fiber = 20: 80 (wt / wt) to 80:20 (wt / wt), particularly 40:60 (wt / wt) to 60: 40 (wt / wt) is preferable because both the durability of the sheet and the feel to the skin can be achieved.
Nonwoven having a basis (basis weight) is, 30~100g / m ^2, it is preferred in particular 40 to 60 g / m ^2.

Further, the shape, size, etc. of the sheet-like substrate are not particularly limited, and those having a shape such as a circle, a square, a rectangle and the like can be selected according to the purpose.
The thickness is preferably 0.1 to 4 mm, particularly 0.2 to 3 mm, from the viewpoint of ease of use and portability. 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 , particularly preferably 0.1 to 0.25 g / cm ³ from the viewpoint of the impregnation property of the aqueous cleaning liquid and foaming during use.

  The body cleaning material of the present invention preferably incorporates air when used with water added in order to improve foaming and improve cleanability. For this purpose, the nonwoven fabric preferably has a porosity represented by the following formula of 70 to 99%, particularly 85 to 99%.

Porosity (%) = (1− (ρ ′ / ρ)) × 100
(Where ρ: specific gravity of the sheet, ρ ′: apparent specific gravity of the sheet)

In the body cleaning material of the present invention, it is preferable that the average interfiber distance of the nonwoven fabric is 1 to 100 μm, particularly 1 to 50 μm, from the viewpoint of excellent liquid impregnation and formation of finer bubbles.
The average interfiber distance is calculated by the following method. The thickness of the nonwoven fabric is L (cm), the basis weight 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 (%), and the average diameter of the constituent fibers is Fd. Assuming (μm), the average interfiber distance Dp is expressed by the following equation.

The fineness Di is determined by using the differential scanning calorimeter to identify the type of each fiber, and from the density of the specified fiber di (g / cm ³ ) and the diameter Fdi (μm) of the constituent fiber i, Calculated.
Di = 1 million (cm) × cross-sectional area (cm ² ) × specific gravity (g / cm ³ )
= 1000000 × π (Fdi / 2) ² × di

  Further, the nonwoven fabric is not limited to a single layer but may be a multilayer. In the case of multiple layers, for example, three layers, it is preferable to provide a cushion layer using latent crimped fibers or the like in the intermediate layer to extrude air to further increase foaming.

The method for producing the nonwoven fabric is not particularly limited, but in addition to the spunlace method, a wet spunbond method, a thermal bond method, an air-through method, a resin bond method, and the like are preferable in terms of touch.
A non-woven fabric may be provided with a density density gradient of fibers, or patterned by embossing or the like to provide a high density portion and a low density portion.

  In the present invention, such a nonwoven fabric is impregnated with the aqueous cleaning liquid. The impregnation rate is preferably 1 to 3 g / g, particularly 2 to 2.5 g / g, with respect to 1 g of the sheet.

  The sheet-like body cleaning material of the present invention is a wet type cleaning material in which a specific nonwoven fabric is impregnated with an aqueous cleaning liquid as described above, and is suitable for body cleaning, particularly as a face wash. In the wet type sheet-like cleaning material, it is preferable to store in a hermetically sealed package in order to prevent volatilization of the liquid agent.

  The sheet-like body cleaning material of the present invention can be washed by adding water during use and foaming and massaging the body using the sheet.

Examples and Comparative Examples A sheet-like body cleaning material (amount of impregnation of aqueous cleaning liquid 2.3 g / g (sheet)) having the composition shown in Table 1 was produced, and foamed, feel to the skin, usability, and applied to the skin. Irritation was evaluated. The results are also shown in Table 1.

(Evaluation methods)
(1) Foaming properties, skin feel, usability:
An appropriate amount of water was added to each sheet-like body cleaning material and foamed using a specialized panel, and the face was washed with this and rinsed with tap water. The foaming property, feel to the skin and usability at that time were subjected to sensory evaluation and judged according to the following criteria. Usability refers to ease of use as a cleaning sheet, and it is preferable that water can be used smoothly without foaming or curling when foamed and applied to the skin.
A: Very good.
○: Good.
Δ: Normal.
X: Bad.

(2) Skin irritation:
The cup shake method was used for evaluation. That is, a solution obtained by diluting each aqueous washing solution 5 times with ion-exchanged water is prepared, and 10 mL of this aqueous solution is put in a glass cup having a diameter of 3.5 cm placed on the forearm of 10 professional panels and brought into contact with the skin for 30 minutes a day. I let you. After performing this continuously for 3 days, the skin condition was evaluated according to the following criteria.
○: No more than 5 people were found to drop.
Δ: Dropping was observed in 6 or more people, but no erythema was observed.
X: Dropping and erythema were observed in 6 or more people.

Claims (3)

An aqueous cleaning solution containing 10 to 30% by mass of an anionic surfactant and diluted 20 times with water and having a pH of 3 to 6.5 is applied to a nonwoven fabric composed of mixed fibers of ultrafine synthetic fibers and cellulosic fibers. Impregnated sheet-like body cleaning material. Anionic surfactant, a sheet-like body cleaning material of claim 1 wherein the alkyl phosphate ester salts. The sheet-like body cleaning material according to claim 1 or 2 , wherein the aqueous cleaning liquid contains 1 to 10% by mass of a foam increasing agent.