JPH0522760B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a cleaning agent exclusively for cosmetic sponges. More specifically, the present invention relates to a cleaning agent specifically for cosmetic sponges that has a good cleaning effect and does not deteriorate the microbial resistance of the cosmetic sponge even after repeated washing. In recent years, with the diversification of makeup behavior, makeup sponges have come into widespread use in various forms. For example, it is used for applying foundation throughout the year, and is also preferred for eye make-up and point make-up such as blushing due to its ease of use and finish. Furthermore, it is sometimes used as a tool for wiping off applied cosmetics. It can be used either with a dry sponge or with water. Since cosmetic sponges are used repeatedly over long periods of time, there is a possibility that resident bacteria from the user's face, hands, or in the air may adhere to them and breed.
Therefore, commercially available sponges are usually treated with antibacterial agents. In addition, most acrylonitrile butadiene rubber (hereinafter referred to as
The excess vulcanization accelerator contained in the sponge (called NBR) also has an antibacterial effect. On the other hand, there are cosmetic effects that prevent cosmetics from sticking and spreading on the skin (accumulation of oil and sebum in cosmetics worsens the sticking and spreading of cosmetics onto the skin), or from mixing different colors of cosmetics. It is preferable to wash the cosmetic sponge frequently from the surface and from the surface that has been used to keep it clean. However, since there is still no commercially available cleaning agent specifically for cosmetic sponges, many sponge users currently use solid soaps made of higher fatty acid salts to clean their sponges. However, as cosmetic sponges are repeatedly washed, microorganisms breed, mold grows, and they often become slimy and smelly, which has become a major cause of consumer complaints. In particular, there have been many complaints about sponges that are used after being dipped in water, as they create favorable conditions for the growth of microorganisms, and this has become a source of serious concern within the industry. The inventors of the present invention have conducted intensive research to solve the above problem, and have found that when a cosmetic sponge is washed with solid soap, which is conventionally used by many users, the antibacterial agent and excess Vulcanization accelerators are deactivated or washed away, and their antibacterial effect gradually decreases.However, if a specific surfactant is used, repeated washings will also remove the antibacterial agent and excess vulcanization accelerator. It was discovered that the antibacterial effect of the agent is maintained permanently without being deactivated or washed away. The present invention is based on the above findings. That is, the present invention is a cleaning agent exclusively for cosmetic sponges, which contains an acidic or neutral surfactant as a main component, has a good cleaning effect, and does not deteriorate the microbial resistance of the cosmetic sponge even after repeated washing. Hereinafter, the configuration of the present invention will be explained in detail. The acidic to neutral surfactants used in the present invention include anionic surfactants such as alkyl sulfates, polyoxyethylene alkyl sulfates, and alkylaryl sulfonates, and nonionic surfactants such as polyoxyethylene alkyl ethers and fatty acid ethanolamides. Surfactants and amphoteric surfactants such as imidazoline derivatives. Although higher fatty acid salts are anionic surfactants, as mentioned above, they are undesirable because they reduce antibacterial activity.Although nonionic surfactants are polyoxyethylene fatty acid esters, polyhydric alcohol fatty acid esters, and sucrose fatty acid esters is not preferable because the cleaning effect is insufficient. Furthermore, when using a nonionic surfactant with a low HLB, it is preferable to combine it with other surfactants so that the HLB of the entire detergent is 9 or more. Imidazoline derivatives are particularly preferred because they have detergency and antibacterial activity at the same time. In the present invention, one or more surfactants selected from the above acidic to neutral surfactants are used. The blending amount varies depending on the detergency of the surfactant itself, but generally it is 5% of the total amount of detergent.
Weight% to 100% by weight. Cosmetic sponges targeted by the present invention are NBR sponges and urethane sponges, particularly NBR sponges and urethane sponges that have been treated with antibacterial agents (including almost all commercially available cosmetic sponges). In addition to the above-mentioned essential ingredients, the cosmetic sponge cleansing agent of the present invention may contain other surfactants, thickeners such as water-soluble polymers and water-swellable clay minerals, and alkyl monoesters, if necessary. Alternatively, opacifiers such as diesters, humectants, powders, anti-caking agents such as carboxymethyl cellulose or starch, fragrances, pigments, chelating agents, preservatives and sterilizers, PH regulators, etc. are blended. Of course, these must be used under qualitative and quantitative conditions that do not impair the purpose of the present invention. The cosmetic sponge cleaning agent of the present invention does not promote the growth and proliferation of microorganisms, prevents odor, mold growth, deterioration, etc. even when the sponge is repeatedly washed, and has high cleaning power. It has the properties required as an agent. Next, the present invention will be explained in more detail with reference to Examples. The present invention is not limited thereby. The blending amount is in weight%. [Examples 1, 2, 3, Comparative Examples 1, 2] Example 1 Linear alkylbenzene sulfonate 27.0 Ammonium xylene sulfonate 1.6 N-decyl-dimethylamine oxide 2.7 Flavoring, coloring agent Appropriate amount Add water to make 100 . [Manufacturing method] Heat water to 70℃, add other ingredients and dissolve uniformly, then cool. Example 2 Polyoxyethylene lauryl sulfate 16.0 Linear alkylbenzenesulfonic acid 14.3 Caustic soda 2.2 Urea 8.0 Sequestering agent 0.05 Flavoring, coloring agent Appropriate amount Add water to make 100. [Manufacturing method] Heat water to 70℃, add the ingredients from ~ to dissolve uniformly, and then cool. Example 3 Alkyl sulfonate 4.5 Alkyl ether sulfonate 8.8 Fatty acid diethanolamide 6.0 Sequestering agent 0.06 Thickener 0.03 Citric acid 0.3 Preservative 0.45 Add water to make 100. [Manufacturing method] Heat water to 70℃, add ~ to dissolve uniformly, and then cool. Comparative example 1 Higher fatty acid sodium salt (soap base)
100.0 Sequestering agent 0.2 Perfume/Pigment Appropriate amount [Manufacturing method] Add fragrance and color to the soap base to make the product. Comparative example 2 Ethanol 16.0 Glycerin 12.9 Polyethylene glycol 5.8 Liquid paraffin 0.4 Stearic acid 9.3 Myristic acid 22.8 Caustic soda 10.3 Sequestering agent 0.01 Sugar 10.9 Salt 0.42 Flavoring/coloring appropriate amount Water Add to the remainder [manufacturing method], and then add and perform saponification reaction. conduct. Add to this and dissolve and mix. Add and cool to solidify. [Effect] Two types of NBR sponges containing excess vulcanization accelerator (one as is and the other treated with antibacterial treatment with zinc pyrithione) were used as test sponges to measure changes in antibacterial activity due to washing. First, a sponge is immersed in each of the aqueous solutions of Examples 1, 2, and 3 and Comparative Examples 1 and 2, and tap water. After a certain period of time had elapsed, the sponge was taken out, thoroughly washed with water (tap water), and cut into 1 cm cubic pieces to form test pieces. Pseudomonas aeruginosa odor sponge isolated bacteria (Pseudomonas sp.) and mold (Penicillium sp.) were used as test strains.
The cells were precultured at 30°C for 24 hours and at 25°C for 7 to 10 days. The antibacterial effect was measured by the size of the inhibition zone produced by the following method. On a meat juice agar medium (40°C), mix 10 ⁸ /ml of pre-cultured
(before and after). Immediately place the test piece on the medium and leave it to cool. After the medium has solidified, leave it in a constant temperature bath at 30°C and culture for 48 hours. Due to the antibacterial properties of the sponge, microorganisms cannot grow around the test piece, creating a transparent zone of growth inhibition. The diameter from the tip of the sponge to the edge of the inhibition zone was measured to determine the antibacterial activity. In the same manner, samples that had been precultured were also tested. However, in this case, the number of inoculated bacteria was 10 ⁷ /ml, the medium used was potato dextrose agar medium, and the judgment was made after culturing at 25° C. for 5 days. The measurement results are shown in Tables 1 and 2. Table 1 shows the measurement results for the NBR sponge treated with zinc pyrithione, and Table 2 shows the measurement results for the NBR sponge as it is.

【table】

【table】

[Table] Diameter of inhibition zone for untreated products
(Note) The concentrations of Examples 1 to 3 and Comparative Examples 1 to 2 are the same as in Table 1.
From the results in Tables 1 and 2, it is clear that the cosmetic sponge cleaning agent of the present invention does not reduce the antibacterial effect of sponges compared to tap water or cleaning agents that use higher fatty acids that have been commonly used in the past. it is obvious. Next, NBR treated with antibacterial treatment with zinc pyrithione
Approximately 1.0 g of foundation was evenly applied to one side of a sponge (containing a vulcanization accelerator; oval shape of 6 cm x 5.5 cm) to prepare Comparative Examples 1 and 2, Examples 1, 2, and 3.
(concentrations are the same as in Tables 1 and 2) for 15 minutes, taken out, washed with water, and visually evaluated the cleaning effect. The results are shown in Table 3. As is clear from the results in Table 3, Example 1,
It can be seen that Nos. 2 and 3 have very good cleaning effects. In Comparative Examples 1 and 2, the sponges after washing had a sticky feel that was thought to be due to residual oil, which is not preferable.

【table】

[Table] Next, five types of cosmetic sponges were actually washed 25 times using Example 1 and Comparative Example 1. Measurements were made. Measuring the effect is
The above-mentioned method for measuring the size of the growth inhibition zone was used and the results are shown in Tables 4 and 5. Sponge 1... antibacterial treated with zinc pyrithione
NBR sponge. Sponge 2...Untreated NBR sponge. Sponge 3...Another untreated NBR sponge. Sponge 4...Another untreated NBR sponge. Sponge 5...Another untreated NBR sponge. (All contain a vulcanization accelerator) In Example 1 and Comparative Example 1, aqueous solutions having the same concentrations as in Tables 1 to 3 were used.

[Table] Test strain; Pseudomonas aeruginosa
Diameter of inhibition zone of test article
Survival rate (%) =

Claims (1)

[Scope of Claims] 1 (1) One or more anionic surfactants selected from alkyl sulfates, polyoxyethylene alkyl sulfates, or alkylaryl sulfonates; (2) polyoxyethylene alkyl ethers; , one or two selected from fatty acid ethanolamide
(3) one or more nonionic surfactants selected from alkylimidazoline derivatives;
or two or more amphoteric surfactants, a vulcanization accelerator and/or an antibacterial agent whose main component is one or more surfactants listed in (1), (2), and (3) above. A cleaning agent for acrylonitrile butadiene rubber or urethane cosmetic sponges.