JPS6391311A - Gelatinous cosmetic - Google Patents

Abstract

PURPOSE:To obtain a gelatinous cosmetic, by blending an N-acyl neutral amino acid salt with hydroxy acid and having small temperature dependence of viscosity and hardness, good compatibility with many cosmetic ingredients, sufficient effect as a stabilizer and excellent transparency with hardly any irritation the skin. CONSTITUTION:A gelatinous cosmetic obtained by blending (A) an N-acyl neutral amino acid salt, preferably a basic amino acid salt of the N-acyl neutral amino acid having 8-20C acyl group which is a saturated or unsaturated fatty acid residue with (B) a hydroxy acid, e.g. beta-hydroxydecanoic acid, glycolic acid or lactic acid. The concentrations of the ingredients in the gelatinous cosmetic are 5-60wt% ingredient (A) and 0.01-10wt% ingredient (B). When used particularly as a detergent, the concentrations are preferably within the range of 25-50wt% ingredient (A) and 0.01-1wt% ingredient (B).

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is characterized by blending an N-acyl neutral amino acid salt with an oxyacid, and has low temperature dependence of viscosity and hardness in terms of stability. It has good compatibility with many cosmetic ingredients, has sufficient effect as a stabilizer, and has good transparency (PL+ is weakly acidic, so it causes less irritation to the skin, leaving your skin moist and smooth after use.) The purpose of the present invention is to provide a new gel-like cosmetic that provides the following effects.

[Prior art] There are many cosmetic bases that utilize emulsification, solubilization, etc., but many of the systems that utilize these are metastable, and most of them lose stability over time. □Tondo. For this reason, attempts have been made to increase the viscosity and hardness by adding natural or synthetic polymers, etc., in order to maintain stability for as long as possible, but while the stability is improved, it is extremely difficult to use. This results in problems such as stickiness and poor spreadability.Recently, various gelling agents have been developed, and attempts have been made to add structural viscosity to the system by blending them. However, there have been few cases of actual compounding, as many have poor compatibility with cosmetic ingredients or problems with stability.

[Problems to be solved by the invention] 'In view of the above circumstances, the present inventors have developed a product that has good compatibility with many cosmetic ingredients, has sufficient effect as a stabilizer, and has satisfactory usability. As a result of intensive research aimed at obtaining the desired properties, it was discovered that a gel-like cosmetic obtained by blending an N-acyl neutral amino acid salt and an oxyacid can solve these problems, and the present invention has been completed. It's arrived.

[Means for Solving the Problems] That is, the present invention provides a gel cosmetic characterized by blending one or more N-acyl neutral amino acid salts with one or more oxyacids. It is a fee.

The N-acyl neutral amino acids used in the present invention are preferably saturated or unsaturated fatty acid residues in which the acyl group has 8 to 20 carbon atoms, and examples of the neutral amino acids include sarcosine and N-methyl-β- Alanine is common.

As the basic substance that forms a salt with the N-acyl neutral amino acid used in the present invention, any well-known alkali substance that has been used conventionally may be used. For example, hydroxides of metal elements such as lithium, sodium, potassium, magnesium, calcium, boron, aluminum, monoethanolamine,
Jetanolamine, triethanolamine, morpholine, triisopropanolamine, 2-amino-2-methyl-1,3-propanegiol, 2-amino-2-
Examples include organic amines such as methyl-1-propatol, basic amino acids such as arginine, citrulline, nistidine, nitroxylidine, histidine, tryptophan, lysine, ornithine, and ammonia. The basic amino acid may be either an optically active form or a racemic form.

Among these, basic amino acids are preferred, and are particularly useful as cosmetics for cleaning.

The degree of neutralization of the N-acyl neutral amino acid salt is 0.4 equivalents of the basic substance per 1 equivalent (1 mol) of the N-acyl neutral amino acid! (0.4 mol) to 1.2 equivalent (1.2 mol), particularly preferably 0.6 equivalent (0.6 mol) or more. 0.
If the amount is less than 4 equivalents, gelation is difficult to occur and N-acyl neutral amino acid crystals will precipitate over time, and if it exceeds 1.2 equivalents, gelation will not occur, which is not preferable.

The N-acyl neutral amino acid salt may be added as a salt, or may be added separately to form a salt in the system.

The concentration of N-acyl neutral amino acid salt in gel cosmetics varies depending on the type of acyl group, neutral amino acid, basic amino acid, and degree of neutralization, but is 5 to 80% by weight, preferably 5 to 60% by weight. % by weight, 20-6 when used as a cleaning agent
0% by weight, preferably 25-50% by weight.

Examples of the oxyacid used in the present invention include β-oxydecanoic acid, glycolic acid, lactic acid, malic acid, tartaric acid, and citric acid.

The blending amount is 0.01 to 10% by weight based on the total amount of gel cosmetic.
It is. When used as a cleaning agent, 0.01 to IM amount%
, in other cases, 1 to 10% by weight is preferred.

If it is less than 0.01%, it will be difficult to form a gel, and if it exceeds 10%, the system will have a bad odor.

Depending on the desired purpose, the gel cosmetic composition of the present invention may further contain general ingredients used in cosmetic compositions within a range that does not impair the effects of the present invention. especially,
Humectants such as polyhydric alcohols are useful as viscosity modifiers, usability modifiers, and dissolving agents. It is preferable to blend the oxyacid in an amount of 3 to 10 times the amount of MiI of the oxyacid to be added. As other auxiliary ingredients, fragrances, dyes, drugs, foaming enhancers, viscosity modifiers, fragrances, dyes, etc. can be added as appropriate.

To produce the gel cosmetic of the present invention, for example, a mixture of N-acyl neutral amino acid salt, water, and optionally adjuvants is dissolved at 70 to 80°C, and then an oxyacid is added.
It may be cooled by leaving it to stand, or by stirring and cooling under vacuum. When used as a cleaning agent, use i! Take il in your hands, add water and whisk to use.

The gel cosmetic of the present invention may be used in its gel form as a moisture essence jelly or the like, or may be used as a cream or milky lotion by adding oil or the like.

[Effects of the Invention] In terms of stability, the gel cosmetic composition of the present invention has low temperature dependence of viscosity and hardness, and has good compatibility with many cosmetic ingredients.
It also has sufficient effect as a stabilizer (1) and has a slightly acidic pH, so it is less irritating to the skin and leaves the skin moist and smooth after use. Moreover, depending on the selection of essential components and auxiliary components, transparent gels can also be prepared, which can further increase the commercial value.

[Examples] Next, Examples and Comparative Examples will be given to specifically clarify the present invention, but the present invention is not limited thereto. The blending amount is M%.

(Hereinafter in the margin) (Hereinafter in the margin) (Manufacturing method) After heating and dissolving ■ to approximately 70°C, add ■, then add ■ dissolved in ■ to neutralize it, and finally mix ■.

(Effect) The temperature dependence of the viscosity of Examples 1 to 4 was determined by the following test method. Pack 500g of the sample into a mayonnaise bottle with a diameter of 10cm and leave it in a constant temperature bath at 0℃, 25℃, and 50℃ for 2 days and nights. Once the temperature has become constant, take out the sample and instantly use a Brookfield viscometer (Tokyo Keiki Seisakusho). ) The viscosity was measured under each temperature condition. The results are shown in Figure 1.

The unit is centipoise.

As is clear from Figure 1, the emulsions of Examples 1 to 4 have almost no temperature dependence of viscosity under each temperature condition.

(Margin below) Genozu University at night *Polyoxyethylene; hereinafter.

(Manufacturing method) Add ■■■■ and [phase] to [phase], heat and melt,
Keep at 0°C (Part A), mix other ingredients, heat and dissolve and keep at 70°C (Part B), add Part B to Part A, pre-emulsify, homogenize with a homomixer, and emulsify. After that, cool it down.

(Effect) Using the same method as in Examples 1 to 4, the viscosity was measured under each temperature condition, and it was confirmed that the viscosity change due to temperature was small (Figure 2).

(Comparison of usability) Table 1 shows Examples 5 to 8 and Comparative Example 1.
The results of a test on the feel of the product when applied to the face are shown.

The method involved applying a specific product to the left half of the face and a comparative product to the right half of the face, and summarizing the results by self-reporting the usability from immediately after application until 2 hours later.

The criteria for judgment are as follows.

1. Spreading of the emulsion on the skin during application ◎: Compared to Comparative Example 1, more than 80% of the beauty technicians were satisfied that the emulsion spread well on the skin.

○: Compared to Comparative Example 1, more than 60% of beauty technicians were satisfied that the product spread well on the skin.

Δ: Compared to Comparative Example 1, more than 40% of the beauty technicians were satisfied that it spread well on the skin.

×: Compared to Comparative Example 1, less than 40% of the beauty technicians were satisfied that the product spread well on the skin.

2. Skin condition immediately after application ◎: Compared to Comparative Example 1, more than 80% of the beauty technicians were satisfied that their skin became moist and smooth immediately after application.

○: Compared to Comparative Example 1, more than 60% of the beauty technicians were satisfied that their skin became moist and smooth immediately after application.

Δ: Compared to Comparative Example 1, more than 40% of the beauty technicians were satisfied that their skin became moist and smooth immediately after application.

×: Compared to Comparative Example 1, less than 40% of the beauty technicians were satisfied that the skin became moist and smooth immediately after application.

3. Skin condition 2 hours after application ◎: Compared to Comparative Example 1, more than 80% of the beauty technicians were satisfied that the skin was moist and smooth even 2 hours after application.

○: Compared to Comparative Example 1, more than 60% of the beauty technicians were satisfied that their skin remained moist and smooth even 2 hours after application.

Δ: Compared to Comparative Example 1, more than 40% of the beauty technicians were satisfied that their skin remained moist and smooth even 2 hours after application.

×: Compared to Comparative Example 1, less than 40% of beauty technicians applied 2
I was not satisfied with how moist and smooth my skin felt even after hours.

Scalp treatment (manufacturing method) ①~O are heated and melted and kept at 70°C (Part A). ①~■ are mixed, heated and melted and kept at 70°C (Part B).

Part B was added to part A, pre-emulsified, and uniformly emulsified using a homomixer. After emulsification, the mixture was cooled to 30° C. while stirring to obtain a scalp treatment.

(Effect) Using the same method as Examples 1 to 4, the viscosity of Examples 9 to 12 under each temperature condition was measured, and it was confirmed that the viscosity change due to temperature was small.

(Usability) As a result of examining the feeling of use when Examples 9 to 12 and Comparative Example 2.3 were applied to the scalps of 20 beauty technicians, as shown in Table 1, the results of Example 9-12 and Comparative Example 2.3 were compared to Comparative Example 2.3. Scores 9 to 12 were judged to have good spreadability, moistness and smoothness, and sufficient durability.

(Hereinafter in the margin) (Hereinafter in the margin) (Effect) ゛Comparative Examples 4 to 6 are in liquid or solid form and cannot be filled into tubes, whereas Examples 1 to 4 are in gel form and when filled in tubes, they cannot be filled into containers. It was easy to take out the contents. The cleaning power was also far superior to that of soap-type cleansing foams, and the skin did not feel tight after use.

Furthermore, when measurements were made in the same manner as in Examples 1 to 4, it was confirmed that the temperature dependence of the viscosity was very small.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams showing the temperature dependence of the viscosity of the gel cosmetic composition of the present invention. 0---0 Examples 1 and 5 △□△ Examples 2 and 6 0□mouth Examples 3 and 7 ◇□◇ Example cow and 8 Patent applicant Shisei Doro Co., Ltd. 1

Claims (3)

[Claims] (1) A gel cosmetic comprising an N-acyl neutral amino acid salt and an oxyacid. (2) Claim No. 1, wherein the N-acyl neutral amino acid salt is a basic amino acid salt of an N-acyl neutral amino acid.
Gel-like cosmetics described in Section 1. (3) Claim No. (
The gel cosmetic according to item 1) or item (2).