JPH0753657B2 - Skin cleanser - Google Patents

Description

TECHNICAL FIELD The present invention relates to a skin cleansing agent containing a bactericide whose bactericidal effect is stabilized for a long period of time by incorporating a clay mineral.

[Prior Art] It is generally known that the disinfectant contained in a skin cleanser has a decreased disinfectant effect or is deteriorated by storage or storage for a long period of time, resulting in poor disinfectant effect and discoloration. Further, deterioration or deterioration of the active agent or the fragrance in the skin cleanser also promotes the reduction of the bactericidal effect of the bactericide contained in the skin cleanser.

Stabilizers, usually antioxidants, sequestrants, etc. (either individually or in combination) to prevent deteriorating or rancidity of the skin cleanser without compromising the efficacy of the formulated germicide. Added to skin cleanser. Typical stabilizers include, for example, ethylenediaminetetraacetic acid (hereinafter referred to as EDTA) alkali salt, ethane-1-hydroxy-1,1.
-Diphosphonic acid (hereinafter referred to as EHDP) and its alkali salts, and organic acids such as citric acid. Skin cleansing agents containing these additives suppress the reduction of bactericidal effect,
It shows some improved stability but is not satisfactory.

[Problems to be Solved by the Invention] An object of the present invention is to provide a skin cleansing agent containing a bactericide which has an improved reduction of the bactericidal effect caused by storage or storage without impairing the bactericidal effect of the bactericide. To provide.

[Means for Solving Problems] The above-mentioned object of the present invention is achieved by incorporating a clay mineral in a proportion defined in the present invention into a skin cleansing agent containing a bactericide.

The skin cleansing agent of the present invention is a skin cleansing agent in the form of a solid, cream or liquid containing an anionic surfactant (hereinafter referred to as an anionic surfactant), a clay mineral and a bactericide, and is usually a body part. It is used for the purpose of cleaning.

The anion activator used in the skin cleansing agent of the present invention,
Fatty acid soaps such as sodium fatty acid and potassium potassium; N-acyl amino acid salts such as N-cocoyl-sodium glutamate, sodium N-lauroyl-L-glutamate and sodium N-myristoyl-L-glutamate; higher alcohol sulfates such as sodium lauryl sulfate Ester salts; polyoxyethylene higher alcohol sulfuric acid ester salts such as sodium lauryl ether sulfate; higher alcohol sulfosuccinic acid ester salts such as disodium lauryl sulfosuccinate; sodium isethionate and the like can be used, and one or two of these anion activators can be used. Use more than one seed. Not only anionic surfactants, but also nonionic surfactants represented by polyoxyethylene stearyl ether and polyoxyethylene nonylphenyl ether, and 2-alkyl-N-carboxyethyl-N-hydroxyethylimidazolium betaine. It is possible to mix the above-mentioned amphoteric surfactant as an auxiliary activator with the anionic activator which is the main activator. The blending amount varies depending on the form of the skin cleanser, and in the case of a solid skin cleanser containing a fatty acid salt as the main active agent such as soap, 65 to 95% by weight based on the total amount of the composition, sodium lauryl ether sulfate is used. In the case of a liquid skin cleansing agent such as a body shampoo containing a synthetic active agent such as the above as the main active agent, it is preferable to use 15 to 30% by weight.

As the disinfectant of the skin cleanser of the present invention, a disinfectant that is usually used in skin cleansers can be used, but 2,4,4'-trichloro-2'-hydroxydiphenyl ether (hereinafter referred to as DP-300 Carbon) such as 3,4,4'-trichlorocarbanilide (hereinafter referred to as TCC), benzethonium chloride, zinc bis (2-hydridylcio) -N-oxide, piroctone olamine, photosensitizers, and undecylenic acid. Unsaturated fatty acids having 8 to 22 atoms, sulfur and the like are preferable, and DP-300, TCC and benzethonium chloride are particularly preferable. As the bactericide, one kind or two or more kinds of these compounds are used within the range of 0.001 to 5% by weight, preferably 0.05 to 0.4% by weight, based on the total amount of the composition.

The clay mineral used in the skin cleanser of the present invention has a layered structure based on silicon dioxide (Si ₂ O ₅ ²⁻ ) _∞ and has a particle size of 5
Particles having fine crystal or colloidal properties in the range of 0 μm or less, preferably 0.05 to 30 μm. This clay mineral exhibits plasticity and ion exchange properties when wet. Typical clay minerals include, for example, kaolinite, pyroferrite, montmorillonite, sericite, talc (talc), and gibbsite, which are sterilized by blending one or more of these with a skin cleanser. The bactericidal effect of the agent is stabilized. Especially, the effect is remarkable in kaolin-based clay and talc containing kaolinite as a main component.
The clay mineral is used in an amount of 1 to 50% by weight, preferably 3 to 30% by weight, based on the total amount of the composition.

In addition to the above-mentioned components, the skin cleansing agent of the present invention may contain other components as required. For example, fatty acids, higher alcohols, hydrocarbons, fats and oils, lanolin and esters such as superfatting agents. , Fragrances, pigments, sucrose, polysaccharides, water-soluble polymers, vitamins, plant extracts and the like can be added.

[Effects of the Invention] With the skin cleanser of the present invention, almost no decrease in the bactericidal effect due to storage or storage for a long period of time is observed, and inconvenient phenomena such as discoloration and odor of the skin cleanser occur. It is possible to obtain a skin cleansing agent having good detergency, foamability and finish.

[Examples] Next, the effects of the present invention will be specifically described by showing Examples of the present invention and Comparative Examples. The method for evaluating the stability of the bactericidal effect of the skin cleanser is as follows.

Stability Evaluation After preparing various skin cleansing agents according to the present invention and leaving them in a high temperature bath at 35 ° C. for 21 days to conduct a heat resistance test, they were sterilized by foot odor evaluation after foot washing with a tester. The effect was judged and evaluated as the daily stability of the bactericidal effect. The bactericidal effect is determined using a 5-step method according to the following criteria,
The average score determined by the name tester was rounded off to obtain the evaluation score. The criteria for determining the bactericidal effect are as follows.

Criteria for bactericidal effect: 4 points: Significant improvement is recognized as compared with the comparative product.

3 points: Improvement is recognized as compared with the comparative product.

2 points: Some improvement is recognized as compared with the comparative product.

1 point: equivalent to the comparative product.

0 points: Inferior to the comparative product.

Examples 1 to 3 Solid soaps having the composition shown in Table 1 were prepared by a conventional method, and the stability over time was evaluated. The results are shown in the table.

By adding kaolin, good results showing satisfactory storage durability of bactericidal effect were obtained.

Examples 4 to 6 Solid soap was prepared in the same manner as in Examples 1 to 3 except that a kaolin / talc mixed clay mineral was used instead of kaolin, and the stability over time was evaluated. The results are shown in Table 2.

Even with the combination of kaolin and talc, almost the same results as when the single kaolin of Examples 1 to 3 was used were observed.

Examples 7 to 15 Liquid skin cleansing agents having the compositions shown in Tables 3, 4, and 5 were prepared by a conventional method, and their stability over time was evaluated.
The results are shown in Tables 3, 4, and 5.

By incorporating talc, satisfactory results were obtained in terms of preservation durability of bactericidal effect.

Good results were also obtained when two kinds of fungicides were used in combination.

Even when Vitamin E (dl-α-tocopherol acetate) was added as the other component, a satisfactory bactericidal effect was obtained.

Examples 16 to 18 The solid skin cleansing agents shown in Table 6 were prepared and blended.

All showed good bactericidal effects.

Examples 19 to 21 Creamy skin cleansing agents shown in Table 7 were prepared and blended.

All showed good bactericidal effects.

Examples 22 to 24 Liquid skin cleansing agents shown in Table 8 were prepared and blended.

All showed good bactericidal effects.

Claims (3)

[Claims] 1. An anionic surfactant and a bactericide 0.001 to 5
%, And 1 to 50% by weight of clay minerals. 2. The bactericide is 2,4,4'-trichloro-
2'-hydroxydiphenyl ether, 3,4,4'-trichlorocarbanilide, benzethonium chloride,
One or more compounds selected from the group consisting of unsaturated carboxylic acids having 8 to 22 carbon atoms such as zinc bis (2-hyridyl sio) -N-oxide, piroctone olamine, photosensitizers, undecylenic acid, and sulfur. The skin cleansing agent according to claim 1. 3. The skin cleansing according to claim 1, wherein the clay mineral has a layered structure based on (Si ₂ O ₅ ²⁻ ) _∞ and the particle size is in the range of 0.05 to 30 μm. Agent.