JPH08283141A - Cosmetic - Google Patents

Abstract

PURPOSE: To obtain a cosmetic containing an amide group-containing ionic surfactant having a specific molecular structure, extremely low in skin irritation and excellent in storage stability and functional characteristics. CONSTITUTION: This cosmetic is prepared by including 0.01-15wt.%, preferably 0.05-1wt.% of a dihydrophobic group or dihydrophilic group-containing anionic surfactant of the formula (carbon number of RCO is 20, 18, 16, 14, 12, 10 or 8; X is H, an alkali metal ion, ammonium ion or an organic ammonium ion) therein, or as necessary, properly blending the surfactant with another surfactant, an emulsion auxiliary, a perfume, a coloring agent, a preservative, a pigment, etc. The cosmetic is applicable for basic cosmetics such as skin milk, skin cream, foundation, massage cream, face washing cream, lotion, scalp treatment, hair cream, shampoo and rinse, make up cosmetics and face and hair cosmetics.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to cosmetics having extremely low skin irritation, excellent storage stability and excellent organoleptic properties.

[0002]

2. Description of the Related Art Conventionally, (a) salts of sulfuric acid esters of aliphatic higher alcohols, phosphoric acid esters of aliphatic higher alcohols, N-long chain acylglutamic acid, etc. and basic substances such as caustic soda, caustic potash, triethanolamine, etc. Anionic surfactants, (b) ether type nonionic surfactants such as ethylene oxide adducts of aliphatic higher alcohols, (c) ester type nonionic surfactants composed of higher fatty acids and polyhydric alcohols, etc. Skin cosmetics containing as an emulsifier main component are known. However, these skin cosmetics cannot be said to have sufficient skin safety for consumers with sensitive skin disorders, and improvement thereof has been desired.

[0003]

The problem to be solved by the present invention is to develop a skin cosmetic having sufficient skin safety to satisfy consumers with sensitive skin disorders.

[0004]

Means for Solving the Invention The present inventors have conducted extensive studies in view of the above circumstances, and as a result, the specific emulsion skin cosmetics described below have excellent skin safety and surprisingly excellent storage stability. Finds that it also has excellent sensory characteristics,
The present invention has been completed.

That is, the present invention has the general formula (I)

Embedded image (However, the carbon number of RCO in the formula is 20, 18, 16, 1
4, 12, 10, 8 and X is hydrogen and an alkali metal ion, an ammonium ion, or an organic ammonium ion) and an amide group-containing 2 hydrophobic group 2 hydrophilic group-containing anionic surfactant The cosmetic is characterized by being blended in an amount of 0.01 to 15% by weight based on the total amount of the (composition).

Next, the structure of the present invention will be described. As the amide group-containing 2 hydrophobic group 2 hydrophilic group-containing anionic surfactant of the present invention, the intermediate used in the invention of British Patent 515,882 is used, and a phosphate group is introduced by a conventional method. Is synthesized. As the counter ion, an alkali metal such as sodium or potassium, an ammonium ion, an organic base such as triethanolamine, isopropanolamine, lysine, or an ammonium ion such as a basic amino acid is used. The anionic surfactant of the present invention is neutralized with a double equivalent of alkali. This is because an aqueous solution of such a compound has a pH close to that of skin and is desirable in terms of skin physiology.

The compounding amount of the amide group-containing 2 hydrophobic group 2 hydrophilic group-containing anionic surfactant of the present invention is such that the cosmetic (composition)
0.01 to 15% by weight (hereinafter, wt
%), Preferably 0.05 to 1 wt%. If it is less than 0.01 wt%, it is difficult to obtain a skin cosmetic that achieves the object of the present invention, and if it exceeds 15 wt%, it is not preferable in terms of usability.

Further, as shown in the experimental examples described below, the amide group-containing 2 hydrophobic group 2 hydrophilic group-containing anionic surfactant of the present invention is superior in skin safety as compared with conventional anionic surfactants. There is.

Using an aqueous solution containing 0.001 mol of an amide group-containing 2 hydrophobic group / hydrophilic group-containing anionic surfactant in 100 g as a sample, skin safety is performed according to the "human skin patch test" described below. A sex test was conducted. Table 1 shows the results.

[0010]

[Table 1]

The cosmetic of the present invention comprises 2 hydrophobic groups 2 as described above.
It consists of a hydrophilic group-containing anionic surfactant,
If necessary, other surfactants, emulsification aids, fragrances, colorants, preservatives, pigments and the like can be appropriately added within the range where the object of the present invention is achieved. The skin cosmetics of the present invention include skin milk, skin cream, foundation cream, massage cream, face wash cream, lotion,
It is applied to basic cosmetics such as scalp treatment, hair cream, hair shampoo, and hair conditioner, makeup cosmetics, and hair cosmetics.

[0012]

EXAMPLES The present invention will be described below with reference to examples. The storage stability test, human skin patch test, and feel (sensory test during use) test methods or measurement methods described in Examples are shown below.

(1) Storage stability test The sample was placed in a constant temperature bath at 45 ° C., and the emulsion state and appearance after standing for 6 months were observed. When no abnormality was observed (emulsion state was uniform and homogeneous emulsion was obtained). When formed), it was evaluated as good, and when abnormalities were observed (when oil was separated, when particles became coarse, etc.), it was evaluated as poor.

(2) Human Skin Patch Test On the skin of the flexor side of the forearm of 25 subjects, 0.1 g of the sample was occluded for 24 hours using a patch test plaster with a circular lint cloth having a diameter of 1.0 cm. After the cloth was applied, the skin condition of 25 test subjects of each sample was evaluated and judged according to the criteria shown in Table 2 below. As the determination result, the one with the strongest reaction was used after 1 hour and 24 hours after the removal of the adhesive bandage, and the evaluation was shown by the number of persons with (±) or more.

[0015]

[Table 2]

(3) Feeling (sensory test during use) Twenty female test subjects were applied twice a day in the morning and evening for 30 days to perform a sensory test to test the moisturizing and irritating properties. Moisture retention is evaluated as "moist after use"
The number of respondents who answered "I feel irritation after use" was indicated by the number of respondents who answered "I feel irritation after use."

Examples 1 to 4 and Comparative Examples 1 to 4 [Skin milk] Examples and Comparative Examples were prepared by mixing various emulsifier components as shown in Table 3 and various raw materials as shown in Table 4. An example skin milk was prepared and tested for various properties.

[0018]

[Table 3]

(1) Composition

[Table 4]

(2) Preparation method The components (A) and (B) are uniformly dissolved at a temperature of 80 ° C., and the component (A) is injected with stirring to emulsify the component (B). Prepare by cooling to a temperature of 30 ° C. with stirring. (3) Characteristics Table 3 shows the results of testing the various characteristics according to each example and comparative example. From these results, it is clear that the skin milk of the present invention is excellent in skin safety, storage stability and sensory characteristics during use.

Example 5 [Scalp Treatment (Scalp Treatment)] (1) Composition (1) The acyl group of the general formula (I) has 18 carbon atoms (stearoyl group) of 0.5, and the counter ion is trivalent. Anion surfactant of the present invention which is ethanol ammonium ion (2) 1,3-butylene glycol 6.5 (3) polyethylene glycol 1500 5.0 (4) ethanol 5.5 (5) causticari 0.05 (6) ) Purified water 46.95 (7) 2-hexyldecyl palmitate 10.0 (8) Squalane 5.0 (9) Butylparaben 0.2 (10) Vitamin C 0.15 (11) Flavor 0.05 (12 ) Purified water 19.9 (13) Carboxyvinyl polymer 0.2 These numerical values are wt% with respect to the total amount of the composition, and the same applies to the following examples.

(2) Preparation method A mixture of (7), (8), (9), (10) and (11) dissolved at 75 ° C was kept at 75 ° C (1) and (2). , (3), (4) and (6)
Was added to the mixture with stirring and cooled with stirring to obtain a scalp treatment.

(3) Characteristics The scalp treatment of the present invention was excellent in skin safety, storage stability and sensory characteristics during use.

Example 6 [Cream foundation] (1) Composition (1) Cetostearyl alcohol 1.0 (2) Jojoba oil 15.0 (3) Glycerin monostearate 2.0 (4) Propylene glycol monolaurate 3. 0 (5) Anion surfactant of the present invention in which the acyl group of the general formula (I) has 18 carbon atoms (stearoyl group) and is 0.5 and the counter ion is an ammonium ion (6) Propylene glycol 4 .0 (7) Methylparaben 0.3 (8) Perfume 0.1 (9) Purified water Residue of all components (10) Titanium oxide 8.0 (11) Talc 4.0 (12) Iron oxide 0.5

(2) Preparation method Oil phase components (1), (2), (3), (4) and aqueous phase components (5), (6)
, (7), (8) and (9) and pigment components (10), (11) and (12) were mixed by a conventional method to obtain a cream foundation.

(3) Characteristics The cream foundation of the present invention was excellent in skin safety, storage stability and sensory characteristics during use.

Example 7 [Lotion] (1) Composition (1) The anionic interface of the present invention in which the acyl group of the general formula (I) has 8 carbon atoms and the counter ion is a calcium ion. Activator (2) Glycerin 4.0 (3) 1,3 Butylene glycol 4.0 (4) Ethanol 7.0 (5) Methylparaben 0.5 (6) Citric acid 0.01 (7) Sodium citrate 0.0. 1 (8) Perfume 0.05 (9) Purified water 84.24

(2) Preparation Method The above components were mixed by a conventional method to obtain a lotion.

(3) Characteristics The lotion of the present invention was excellent in skin safety, storage stability and sensory characteristics during use.

[0030]

As described above, the cosmetics of the present invention are excellent in skin safety, storage stability and sensory characteristics during use, and are extremely useful.

Claims (1)

[Claims] 1. A compound of the general formula (I) (However, the carbon number of RCO in the formula is 20, 18, 16, 1
4, 12, 10, and 8 and X is hydrogen and an alkali metal ion, an ammonium ion, or an organic ammonium ion), and the amide group-containing 2 hydrophobic group 2 hydrophilic group-containing anionic surfactant is 0. Cosmetics characterized by being blended in an amount of 01 to 15% by weight.