JP2008001627A - Skin cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems wherein a mixing ratio of a conventional skin cleaner to water regulated so that a solid product may not be formed in a container and debris-like matter may be formed when being rubbed on the surface of the skin is hardly regulated, and the skin cleaner can not be used in a bath when the skin is wet because a type of the skin cleaner solidified by being coated on the skin and rubbed lightly, and removed with the soil and old horny substance present on the skin comprises a cationic surfactant and a polymer solidified by being reacted therewith. <P>SOLUTION: The skin cleaner is used for removing the soil and the horny substance getting old by being changed to the eraser debris-like matter by being coated and rubbed on the skin and being removed with the soil and the horny substance. The skin cleaner contains water, at least a polymer having a reactive group reactive with a cation, a cationic surfactant and an ampholytic surfactant. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a skin cleanser.

  The skin cleanser is for removing dirt and old keratin on the skin. Here, it refers to a type that is applied to the skin and lightly rubbed to remove them together with the solidified one.

Conventional skin cleansing agents consist of a cationic surfactant and a polymer that reacts with it to solidify. For example, it is a skin cleaning material like patent document 1. FIG.
JP 2005-187338 A

  In this conventional example, by applying a small amount to the skin and gently massaging it, an eraser scrap can be produced, and at the same time, dirt and old keratin can be removed. You can see visually that it was cleaned.

However, in the above-mentioned conventional examples, all the commercially available products are composed of water and an eraser scrap polymer, and a cationic surfactant that reacts with the polymer, and the mixing ratio with water Is also subtle. In other words, the mixing amount must be adjusted so that solid matter does not come out in the container and becomes scrapy when rubbed on the skin surface.
Thus, since the mixing ratio with water is delicate, if the skin is wet with water, it becomes difficult to produce debris.

In addition, the conventional one is liable to cause dripping and difficult to massage. That is, the water resistance is poor. For this reason, it could hardly be used during bathing where the skin was wet.
Therefore, the present invention provides a cleaning agent that reliably produces debris even when the skin is wet.

  In view of the above situation, the present inventor has completed the skin cleanser of the present invention as a result of diligent research, and the feature of the present inventor is that it is in the form of an eraser scrap when applied to the skin and rubbed. It removes dirt and old keratin, etc. together with its waste, and contains at least water, a polymer having a reactive group that reacts with a cation, a cationic surfactant, and an amphoteric surfactant. There is in point to do.

  Here, the polymer having a reactive group that reacts with a cation is an anionic water-soluble polymer, and is generally a carboxyvinyl polymer or the like. This is a polymerized acrylic acid monomer. However, any material may be used as long as it reacts with the cationic surfactant and rubs to become an eraser scrap (gel).

  The content of this polymer is suitably 0.2 to 7% by weight of the entire skin cleanser of the present invention. If it is 0.2% or less, gel formation is insufficient, and if it is 7% or more, the viscosity of the gel increases and it is difficult to use.

Any cationic surfactant may be used as long as it reacts with the above-described polymer. Usually an ammonium salt. For example, monoalkyltrimethylammonium salt, dialkyltrimethylammonium salt, alkylpyridinium salt, dialkylmoriphonium salt and others.
The mixing amount is suitably 0.2 to 7% by weight as described above.

Although the above-mentioned combination produces eraser scraps, this alone does not or does not cause much scraping on wet skin. In order to solve this problem, an amphoteric surfactant is mixed in the present invention.
An amphoteric surfactant is a surfactant containing a cationic active group and an anionic active group in the molecule. This shows the property of an anionic surfactant in the alkaline region and the property of a cationic surfactant in the acidic region when dissolved in water.

  Examples of amphoteric surfactants include alkylamino fatty acid salts, alkylbetaines, alkylamine oxides, etc., for example, lauryldimethylaminoacetic acid betaine, 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, coconut oil alkyl Examples include dimethylamine oxide solution, N-lauroyl-N′-carboxymethyl-N′-hydroxyethylethylenediamine sodium, lauric acid amidopropyl hydroxysulfobetaine solution, and the like. Any of them can be used, but alkylbetaines are preferred because they are less irritating to the skin.

  The mixing amount of the amphoteric surfactant is preferably 0.1 to 5% by weight, and more preferably 0.5 to 3% by weight. If it is 0.1 or less, the effect is small, and if it is 5 or more, foaming increases and the reactivity becomes poor.

By adding this amphoteric surfactant, eraser scraps are very easily produced even when the skin is slightly wet, and the water resistance is improved. This has the great advantage that it can be used during bathing.
Moreover, there is little irritation | stimulation and safety | security is high compared with a cationic activator.

Furthermore, you may add a hydrophilic thickener here. Examples include pectin, carrageenan, xanthan gum, guar gum, methylcellulose and the like.
When this hydrophilic thickener is mixed, not only the stability of the cleaning agent itself is improved, but also a moisturizing effect is given to the skin, and an eraser scrap is easily produced. The mixing amount of the thickener is not particularly limited, but is preferably about 0.01 to 5% by weight.

  Furthermore, you may mix polyhydric alcohol like glycerol with said essential component. This is because the moisturizing effect and eraser scraps are more likely to come out. As the polyhydric alcohol, not only the glycerin but also ethylene glycol or polyethylene glycol can be used. The mixing amount is 1 to 20% by weight, and 3 to 15% by weight is more preferable.

  The above components are completed by adding water to 100% by weight, but other components may be added without departing from the spirit of the present invention. For example, plant extracts, vitamins, coloring agents, fragrances and the like.

The cleaning agent of the present invention is used by applying an appropriate amount of the cleaning agent to the skin (which may be wet) and rubbing the skin so that it is gently massaged. If it does in this way, a liquid will solidify and it will become scraps of eraser. It removes dirt and stale keratin from the skin.
After that, wash the waste with water or lukewarm water. This can be done easily. And it may or may not be maintained after normal cleaning.

The skin cleanser of the present invention has the following effects.
(1) Since it is solid and removes dirt and the like, it is visually easy to understand and is preferred by users.
(2) Since water resistance is high, eraser scraps are easily produced even in slightly wet parts, and there is little dripping.

  Hereinafter, based on an Example, this invention is demonstrated in detail.

Example 1
Examples and Comparative Examples were prepared by mixing the following components.
Examples were prepared by mixing a polymer having a reactive group that reacts with a cation, a cationic surfactant, an amphoteric surfactant, a thickener, water and the like. The mixing amount is as shown in Table 1, and the component names in the table are as follows.
A: Carbopol 940 from Noveon, a carboxyvinyl polymer
B: Behenyltrimethylammonium salt C: Amphoteric surfactant, lauryldimethylaminoacetic acid betaine D: Amphoteric surfactant, 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine E: Amphoteric surfactant, coconut oil Alkyldimethylamine oxide solution F: thickener, pectin G: glycerin H: water

A few of these examples were applied to the skin and lightly massaged from above to solidify. And various effects were judged. The results are also shown in Table 1.
Here, in the state of generation of scraps, ◎ represents “very good”, ◯ represents “good”, and Δ represents “scraps but less effective”.
In terms of water resistance, it was confirmed whether or not eraser scraps could be visually confirmed by rubbing lightly with a sufficiently damp hand. That is, the comparison was made using the conventional example in a wet state, the conventional example in a wet state, and the product of the present invention in a wet state. ◎ is “a lot of waste like the visual confirmation in the non-wet state of the conventional example”, ○ is “same or slightly less than the visual confirmation in the non-wet state of the conventional example” , X represents “a level equivalent to or slightly less than that of the conventional visual confirmation in a wet state”.
In stability, ◎ represents “very stable”, ◯ represents “stable”, and x represents “unstable (separation, etc.)”.

Further, Comparative Example 1 in Table 1 contains a thickener but does not mix an amphoteric surfactant, and Comparative Example 2 contains a polyhydric alcohol but does not mix an amphoteric surfactant. 3 is a mixture of a large amount of double-sided surfactant.
All these comparative examples were not only poor in stability, but could hardly be used when the skin was wet.

Claims (4)

By applying it to the skin and rubbing it, it turns into an eraser scrap and removes dirt and keratin with the scrap, and at least a reactive group that reacts with water and cations. A skin cleanser comprising a polymer having a cationic surfactant, and an amphoteric surfactant. The mixing amount of the polymer is 0.2 to 7% by weight, the cationic surfactant is 0.2 to 7% by weight, and the amphoteric surfactant is 0.1 to 5% by weight. Skin cleanser. The skin cleanser according to claim 1 or 2, further comprising a hydrophilic thickener. Furthermore, the skin cleansing agent of Claims 1-3 which mixes a polyhydric alcohol.