JP7142447B2 - Chemicals for wet wipes and wet wipes - Google Patents

Description

The present invention relates to a chemical solution for wet wipes and wet wipes.

2. Description of the Related Art Conventionally, wet wipes obtained by impregnating a sheet material such as non-woven fabric or paper with a chemical liquid are known as wipes for baby's buttocks, body or buttocks wipes for adults, and the like.
For wet wipes, it is common to incorporate a preservative into the chemical solution for the purpose of preserving during storage and use.
Parabens are widely used as preservatives. However, when parabens adhere to the skin, they may cause skin troubles such as rough skin and rashes. Therefore, body wipes in particular are desired to be paraben-free and preservative.
Therefore, for example, in Patent Document 1, as a formulation not containing parabens, a drug solution containing polyaminopropyl biguanide, quaternary ammonium salt, benzoate, citric acid, disodium ethylenediaminetetraacetate, and the balance being water is proposed.

JP 2013-151447 A

However, since the drug solution described in Patent Document 1 contains polyaminopropyl biguanide instead of parabens, it may still irritate the skin. In particular, for users with thin skin such as infants under the age of 3, there is a demand for less irritating quality.

An object of the present invention is to provide a chemical solution for wet wipes and a wet wipe that have an antiseptic effect and are mild.

In order to solve the above problems, the invention according to claim 1,
A chemical solution for wet wipes containing an antiseptic,
The preservative contains 0.3% by mass of hexylglycerin and 0.05-0.1 % by mass of sodium benzoate based on the total ingredients ,
99.0 to 99.25% by mass of all components is water,
It is characterized in that the pH of the chemical solution is adjusted in the range of 3-5.
ADVANTAGE OF THE INVENTION According to this invention, it can be made into the chemical|medical solution which suppressed the irritation|stimulation to skin, while having an antiseptic effect.

In addition, the invention according to claim 2 ,
A wet sheet in which a substrate sheet is impregnated with the chemical solution for a wet sheet according to claim 1 ,
The substrate sheet is characterized by forming a predetermined pattern in which high fiber density regions and low fiber density regions having a lower fiber density than the high fiber density regions are alternately arranged.
ADVANTAGE OF THE INVENTION According to this invention, it can be made into the wet sheet which has a antiseptic effect and has little irritation|stimulation to skin.

In addition, the invention according to claim 3 ,
The wet sheet according to claim 2 ,
The base sheet is impregnated with 140 to 350% by mass of the wet sheet chemical solution with respect to the dry mass of the base sheet.
According to the present invention, effects similar to those of claim 2 can be obtained.

ADVANTAGE OF THE INVENTION According to this invention, the chemical|medical solution for wet wipes and wet wipes which have antiseptic effect and are mild are provided.

Fig. 2 is a plan view showing a herringbone pattern wet sheet; FIG. 4 is a plan view showing a striped wet sheet; FIG. 4 is a plan view showing a grid pattern wet sheet. FIG. 3 is a plan view showing a mesh-patterned wet sheet; FIG. 4 is a plan view showing a wet sheet with a curvilinear pattern; FIG. 6 is a cross-sectional view along line VI-VI of FIGS. 1 to 5;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples.

<Wet sheet>
FIG. 1 is a plan view showing a wet sheet S according to this embodiment.
The wet sheet S is obtained by impregnating a base sheet 10 made of predetermined fibers with a chemical solution in which various components are added to purified water. It is a cleaning sheet used for wiping the buttocks.
In the product form, the wet sheet S is a sealed container having a sheet outlet that can be sealed with an opening/closing lid (for example, JP-A-2008-105746, JP-A-2007-176546, JP-A-2007- 176545, JP-A-2007-176544, JP-A-2006-341905) or a bag (eg JP-A-2005-088970).
In use, the wet sheet S is put directly into the container or bag, or the bag containing the wet sheet S is put into the container, and the user opens the outlet and removes the inner sheet. Pull out and use.

<Base material sheet>
The base sheet 10 is a non-woven fabric manufactured by known techniques such as spunlace, air-through, air-laid, point-bond, spun-bond, and needle-punch using predetermined fibers as a fiber material. Specific fibers include, for example, cellulose fibers such as rayon, lyocell, tencel, and cotton; polyolefin fibers such as polyethylene, polypropylene, and polyvinyl alcohol; polyester fibers such as polyethylene terephthalate and polybutylene terephthalate; and polyamide fibers such as nylon. are mentioned. These can be used alone or in combination of two or more. Also, the base sheet 10 may be made of paper.

For example, as shown in FIG. A predetermined pattern is formed by alternately arranging the fiber density regions 12 .
As the predetermined pattern, for example, as shown in FIG. 1, there is a herringbone pattern in which continuous V-shaped portions are formed by lines that are bent in opposite directions at predetermined intervals.
In the present invention, the angle of the V-shaped portion of the herringbone pattern (the angle at which the line is bent) is not particularly limited. can be

Moreover, as the pattern formed on the base sheet 10, other than the herringbone pattern, for example, a striped pattern, a lattice pattern, a mesh pattern, a curvilinear pattern, and the like can be used. 2 to 5 respectively show a base sheet 10 having a striped pattern (FIG. 2), a grid pattern (FIG. 3), a mesh pattern (FIG. 4), and a curvilinear pattern (FIG. 5).

In addition, in FIGS. 1 to 5, the portion of the high fiber density region 11 is dotted for convenience of explanation.
In addition, the "high fiber density region 11" as used herein means a region having a higher fiber density than the low fiber density region 12, and the density is not particularly limited as long as it is higher than the low fiber density region 12. .
Also, the “low fiber density region 12 ” means a region having a lower fiber density than the high fiber density region 11 , and the density is not particularly limited as long as it is lower than the high fiber density region 11 .

Since the base sheet 10 has the high fiber density region 11 and the low fiber density region 12, the contact area with the skin is reduced, and the friction with the skin can be reduced. As a result, the wet sheet S of the present invention can be used even by people with sensitive skin, infants, and the like, since irritation to the skin can be reduced.
In addition, since the linear recesses (low fiber density regions 12) are provided, liquid diffusion and liquid permeability are superior to those of a flat base sheet, so that the base sheet 10 is evenly and evenly filled with the chemical solution. It will be applied.

The number of lines in each pattern formed by the high fiber density regions 11 and the low fiber density regions 12 is preferably 3 to 7 lines/cm.
Here, the number of lines (lines/cm) as used herein means how many linear high-fiber-density regions 11 and linear low-fiber-density regions 12 are present per 1 cm. there is
That is, it means how many fibers are present in the direction perpendicular to the direction parallel to the linear high fiber density regions 11 and the linear low fiber density regions 12 provided in parallel (the direction in which the number is the largest). is doing. In other words, 4 fibers/cm means that two linear high fiber density regions 11 and two linear low fiber density regions 12 are provided in 1 cm.
When the number of lines is less than 3 lines/cm, the surface of the base sheet 10 approaches a flat surface, and dirt that has once been captured tends to transfer. Further, when the number of lines exceeds 7 lines/cm, the volume of the space formed by the high fiber density region 11 and the low fiber density region 12 becomes too small, so that the low fiber density region 12 is stained with a desired amount. cannot be guaranteed.

FIG. 6 is a sectional view taken along line VI-VI in FIGS. 1 to 5. FIG.
The height (thickness) Hm from the back surface of the high fiber density region 11 is, for example, preferably 200 μm or more and less than 600 μm, and the height (thickness) Hd from the back surface of the low fiber density region 12 is, for example, 150 μm or more. , less than 200 μm.
At this time, the height difference between the high fiber density region 11 and the low fiber density region 12 is preferably about 50 to 100 μm.
If the height difference is less than 50 μm, a large trapping effect by the low fiber density region 12 cannot be expected, and the desired wiping amount cannot be secured. This is because the thickness increases and the flexibility and the feeling of touch are impaired.

Further, the fiber basis weight of the high fiber density region 11 is preferably, for example, about 40 to 60 g/m ² , and the fiber basis weight of the low fiber density region 12 is, for example, about 10 to 20 g/m ² . preferable.
When the fiber basis weight satisfies the above range, a suitable thickness can be obtained, and both strength and flexibility of the base sheet 10 can be ensured.

In the present embodiment, the convex portion is the high fiber density region 11 and the concave portion is the low fiber density region 12. However, the present invention is not limited to this, and the convex portion is the low fiber density region 12 and the concave portion is the high fiber density region. It may be the fiber density region 11 .

<Chemical solution>
The chemical liquid is mainly composed of water (purified water) and contains an antiseptic.
The water content is 99.0 to 99.25% by mass with respect to all components of the chemical solution. Further, the antiseptic is blended at a ratio of 0.75 to 1.0% by mass with respect to the total components of the chemical solution. Further, it is preferable that the pH of the chemical solution is adjusted to a weakly acidic range of 3 to 5.
With such a configuration, the chemical solution of the present embodiment has antiseptic effect while suppressing irritation to the skin. Therefore, the wet sheet S impregnated with this chemical solution can be used even by people with sensitive skin, infants, and the like.

Hexylglycerin or ethylhexylglycerin is used as a preservative.
Hexylglycerin and ethylhexylglycerin may be commercially available, chemically synthesized, naturally derived from animals or plants, or obtained by fermentation or genetic recombination.
Hexylglycerin or ethylhexylglycerin is a substance with a broad antibacterial spectrum and high antibacterial effect. In addition, hexylglycerin or ethylhexylglycerin has a moisturizing function, and by including this, the wet sheet S can be improved in water retention. By increasing the moisture retention of the wet sheet S, dirt can be wiped off without rubbing the wet sheet S many times, so it is possible to reduce irritation to the skin.

Preservatives also include sodium benzoate.
Sodium benzoate is, for example, a substance that has an antibacterial effect against mold, yeast, aerobic bacteria, and the like.
Sodium benzoate exerts antiseptic effect at pH 5 or less. That is, when the pH of the chemical solution is higher than 5, the antiseptic effect of sodium benzoate is almost lost. Also, in general, if the pH is lower than 3, it becomes strongly acidic, which may irritate the skin and cause rough skin. Therefore, it is preferable to adjust the pH of the chemical solution to the range of 3-5.

Specifically, 0.05 to 0.10% by mass of ethylhexylglycerin and 0.075 to 0.10% by mass of sodium benzoate are added to the total components of the chemical solution.
Alternatively, 0.1 to 0.5% by mass of hexylglycerin and 0.05 to 0.10% by mass of sodium benzoate are added to the total components of the chemical solution.
By blending in such a manner, the antiseptic effect can be exhibited more effectively.

In addition, antiseptics such as phenoxyethanol, benzalkonium chloride, cetylpyridinium chloride, and chelating agents can be blended.

Further, the impregnation rate of this chemical solution can be 140 to 350% by mass with respect to the dry mass of the base sheet 10 .
The conditions for measuring the dry mass of the base sheet 10 are a temperature of 25° C. and a humidity of 40%. The impregnation rate of 140% by mass means that the base sheet 10 with a dry mass of 100 g is impregnated with 140 g of the chemical solution. This means that 350 g of the chemical solution is impregnated with respect to 10.
If the impregnation rate is less than 140% by mass, the liquid does not sufficiently permeate, resulting in uneven impregnation, and the components in the solution tend to be unevenly distributed. easier.

EXAMPLES The present invention will be described in more detail below based on examples, but the present invention is not limited only to these examples.

1. Preparation of chemical solutions Chemical solutions 1 to 7 having the compositions shown in Table I were prepared. In addition, the numerical value of the composition in Table I means the mass %. The preparation was carried out by putting the amount of purified water shown in Table I in a beaker under an environment of 25° C., and sequentially adding the amount of each chemical component shown in Table I while stirring with a stirrer.

2. Preservative efficacy test A preservative efficacy test was conducted according to the procedures (1) to (4) in accordance with the preservative efficacy test method of the 17th revision of the Japanese Pharmacopoeia.
(1) Preparation of test spore solution Bacteria were inoculated on a soybean-casein-digest agar medium (SCDA), cultured at 35°C for 24 hours, and then adjusted to a bacterial count of 10 ⁷ /mL using physiological saline. was used as a test fungus solution.
Yeast was inoculated on a Sabouraud agar medium (SDA), cultured at 35° C. for 48 hours, and then diluted with physiological saline to a bacterial count of 10 ⁷ /mL to prepare a test bacterial solution.
The test mold was inoculated on a potato dextrose agar medium (PDA), cultured at 25° C. for 1 week, and then prepared with a 0.05% Tween 80 solution so that the number of spores would be 10 ⁶ /ml, which was used as the test spore solution. .
( ² ) Preparation of test sample Composition: 40% rayon, 40% PET, 20% binder (PP/PE). prepared. In addition, each of the chemical solutions 1 to 6 was diluted so that the mass ratio of water to the chemical solution was 1:9 (dilution ratio 90%).
Then, wet sheets 1 to 6 were prepared by impregnating each of the diluted chemical solutions 1 to 6 at an impregnation rate of 200% by mass, and used as test samples.
(3) Inoculation and Cultivation of Test Bacterial Solution A test sample was placed in a stomacher bag, and after inoculation with the prepared test bacterial solution and spore solution, the bag was sealed and cultured at 25°C.
(4) Viable cell count measurement Immediately after culturing, on days 7, 14, and 28, the test sample and SCDLP Broth or GPLP Broth were placed in a stomacher bag and stomached for 5 minutes. After that, a 10-fold dilution series of the test sample was prepared using sterilized physiological saline to obtain a test solution.
These test solutions were inoculated on SCDLP agar medium for bacteria, and on GPLP agar medium for fungi and yeast. After inoculation, the bacteria and yeast were cultured at 35°C for 48 hours and 72 hours, and the fungi were cultured at 25°C for 3 days and 5 days.

Table II shows the results of a preservative efficacy test using Aspergillus aspergillus for wet sheets 1 to 6 according to the above procedure (Examples 1 to 3, Comparative Examples 1 to 3). In Table II, <10 ¹ indicates that no bacteria were detected by 0.1 ml culture of the test solution.

As shown in Examples 1 to 3 in Table II, in the formulations of the chemical solutions 1 to 3, mold became below the detection limit on the 28th day.
In addition, as shown in Example 1 and Comparative Example 2, when chemical solution 1 and chemical solution 5 are compared, 10 ¹ mold remains when HDI is used as an auxiliary agent, but when sodium benzoate is used, 10 1 mold remains. mold was below the detection limit.

In addition, Table III shows that from the results of Table II, wet wipe 1 using Chemical Solution 1, which is the most effective and cost-effective formulation, was subjected to the above procedure for all bacterial species (Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa) fungi, Candida, and Aspergillus) are the results of preservative efficacy tests (Examples 4 to 8).

As shown in Examples 4 to 8 in Table III, the formulation of Chemical Solution 1 is effective against all bacterial strains.

3. Moisturizing Function Test A stanlace nonwoven fabric (basis weight: 34 g/m ² ) composed of 40% rayon, 40% PET, and 20% binder (PP/PE) was cut into 200 mm×185 mm pieces. Wet sheets 7, 8, and 9 were prepared by impregnating the chemical liquids 1, 4, and 7 at an impregnation rate of 300% by mass into a laminate of 10 sheets of the nonwoven fabric.
Then, the wet sheets 7, 8, and 9 were each left in a constant temperature bath at 50°C for 30 minutes, then taken out and weighed to determine the rate of mass reduction from the initial stage. The results are shown in Table IV (Example 9 and Comparative Examples 4 and 5).

As shown in Table IV, the wet sheet 7 using the chemical solution 1 is less likely to dry than the wet sheets 8 and 9 using the chemical solutions 4 and 7, and has high water retention.
Therefore, since the wet sheet 7 has a high water retention property, the dirt can be wiped off without rubbing the wet sheet 7 repeatedly, so that irritation to the skin can be reduced.

4. Confirmation Test for Yellowing Wet sheets 7, 8, and 9 impregnated with chemical solutions 1, 4, and 7 were prepared in the same manner as in the moisturizing function test.
Then, the wet sheets 7, 8, and 9 were each left under a UV lamp of 253.7 nm for 3 days, and then the color difference was measured. The results are shown in Table V (Example 10 and Comparative Examples 6 and 7 ).
In addition, the wet sheets 7, 8, and 9 were each allowed to stand in a constant temperature bath at 60°C for 3 days, then taken out and measured for color difference. The results are shown in Table V (Example 11 and Comparative Examples 8 and 9). .
A color difference meter (manufacturer: NIPPON DENSYOKU, product name: spectral color difference meter, model number: NF333, ND120) was used to measure the color difference. In addition, it shows that yellowishness is so strong that b value is high.

Here, yellowing means that organic acids (dehydroacetic acid and sorbic acid) and benzoic acid, which are generally used as preservatives, react with oxygen in the air (oxidation reaction) or are decomposed by ultraviolet rays. This is a phenomenon in which the nonwoven fabric turns yellow. In particular, in the case of wet wipes used as baby wipes, there is an opportunity to warm them before use, and warming accelerates the oxidation reaction, so yellowing is more likely to proceed.
As shown in Table V, wet sheet 7 using chemical solution 1 can be prevented from yellowing due to ultraviolet light or heating as compared to wet sheet 9 using chemical solution 7 .
In addition, it can be seen that even the wet sheet 8 using the chemical solution 4 can prevent yellowing. This is probably because it contains ethylhexylglycerin.

S wet sheet 10 base sheet 11 high fiber density region 12 low fiber density region

Claims (3)

A chemical solution for wet wipes containing an antiseptic,
The preservative contains 0.3% by mass of hexylglycerin and 0.05-0.1 % by mass of sodium benzoate based on the total ingredients ,
99.0 to 99.25% by mass of all components is water,
A chemical solution for a wet sheet, characterized in that the pH of the chemical solution is adjusted to a range of 3-5. A wet sheet in which a substrate sheet is impregnated with the chemical solution for a wet sheet according to claim 1 ,
A wet sheet characterized in that the substrate sheet is formed with a predetermined pattern in which a high fiber density region and a low fiber density region having a lower fiber density than the high fiber density region are alternately arranged. . 3. The wet sheet according to claim 2 , wherein the base sheet is impregnated with the wet sheet chemical in an amount of 140 to 350% by mass with respect to the dry mass of the base sheet.

Images