JPH0739592B2 - Cream-like skin cleansing composition - Google Patents

Description

TECHNICAL FIELD The present invention relates to a creamy skin which maintains a stable state having sufficient softness even at a low temperature, does not cause deterioration in appearance, and has high skin safety. The present invention relates to a detergent composition.

Prior Art N-acyl acidic amino acid salts are by nature hypoallergenic,
The cream-type skin cleansing agent containing this as a main component exhibits excellent detergency even with weak acidity, and is therefore widely used for people with sensitive skin, alkaline hypersensitivity, and skin diseases. As described above, the creamy skin cleanser containing an N-acyl acidic amino acid salt as a main component is excellent in safety, but has a drawback that it lacks stability, especially at low temperature.
That is, when this skin cleansing agent is stored at a low temperature near 0 ° C., it loses its softness and becomes difficult to handle, and crystals are deposited to deteriorate the quality and appearance, and the creamy form cannot be maintained.

In order to improve such a defect, a stabilizer such as fatty acid diethanolamide may be added (see JP-A-50-11780).
No. 6, JP-A-56-106999) A method is proposed in which a large amount of nonionic surfactants having various HLB values are combined and combined (JP-A-58-89697). ,
Stabilizers such as fatty acid diethanolamide have a problem in their own safety, and the addition of such stabilizers inevitably impairs the favorable property of N-acyl acidic amino acid salt, i.e., non-ionic property. When a large amount of a surfactant is blended, there is a drawback that foaming power and detergency are reduced.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention An object of the present invention is to provide a composition having improved low-temperature stability without degrading the advantage of the creamy skin cleansing agent containing an N-acyl acidic amino acid salt as a main component, which is low irritation. It is to provide things.

Means for Solving the Problems The inventors of the present invention have a creamy skin cleansing agent having high skin safety, maintaining a stable state having sufficient softness even at low temperatures, and causing no deterioration in appearance. As a result of repeated studies to develop the above, a creamy skin cleansing composition containing N-acyl acidic amino acid salt as a main component was added to hydrolyzed protein and polyoxyethylene hydrogenated castor oil fatty acid ester type nonionic surfactant. It has been found that the object can be achieved by blending the above in a predetermined ratio, and the present invention has been completed based on this finding.

That is, the present invention relates to a creamy skin cleansing composition comprising an N-acyl acidic amino acid salt as a main component, 10 to 50% by weight of N-acyl acidic amino acid salt (A), hydrolyzed protein (based on the total amount of the composition). B) 0.5-10% by weight and HLB4
To 12 polyoxyethylene hydrogenated castor oil fatty acid ester type nonionic surfactant (C) 1 to 10% by weight, and the weight ratio of (B) + (C) / (A) is 1/10 to 1 / The present invention provides a composition characterized by being in the range of 2.

The N-acyl acidic amino acid salt used as a main component in the composition of the present invention is a compound in which an acyl group derived from a long-chain fatty acid is bonded to the nitrogen atom of an acidic amino acid, that is, an amino acid having two or more carboxyl groups. Salts of, for example, N-lauroyl glutamic acid, N-
Examples thereof include sodium salts, potassium salts, alkanolamine salts, basic amino acid salts and the like of myristoyl glutamic acid, N-cocoyl glutamic acid, N-lauroyl aspartic acid, N-myristoyl aspartic acid and the like. These may be used alone or as a mixture of two or more.

The content of the N-acyl acidic amino acid salt (A) in the composition of the present invention is the same as in the case of the creamy skin cleansing agent containing the N-acyl acidic amino acid salt as a main component, which has been known so far. It is selected within the range of 10 to 50% by weight based on the total amount.

Next, the hydrolyzed protein (B) added for stabilization in the composition of the present invention includes various naturally occurring proteins such as collagen, keratin, elastin, casein, egg white, soybean protein, etc. Or a polypeptide obtained by partial hydrolysis with oxygen,
General formula (R and R'in the formula are aminocarboxymethyl groups of amino acids Is a residue other than, and n is an integer of 2 or more). For use in the composition of the present invention, those having an average molecular weight of 1000 to 20000 are preferable.

The amount of this hydrolyzed protein used is in the range of 0.5 to 10% by weight, preferably 1 to 5% by weight, based on the total amount of the composition. If this amount is less than 0.5% by weight,
Sufficient low-temperature stability cannot be obtained, and if it exceeds 10% by weight, the performance as a detergent such as detergency and foaming ability is deteriorated, which is not preferable.

Next, in the composition of the present invention, it is necessary to use a nonionic surfactant together with the above-mentioned hydrolyzed protein. This nonionic surfactant (C) is HLB4-12.
Polyoxyethylene hydrogenated castor oil fatty acid ester type. Examples of such nonionic surfactants include polyoxyethylene hydrogenated castor oil monoisostearate, polyoxyethylene hydrogenated castor oil triisostearate, polyoxyethylene hydrogenated castor oil pyroglutamate isostearate, and the like. You can This nonionic surfactant (C) is 1 based on the total amount of the composition.
It is necessary to blend within the range of -10 wt%, preferably 2-5 wt%. If this amount is less than 1% by weight, a sufficient low temperature stabilizing effect cannot be obtained, and if it is more than 10% by weight, the detergency and foaming power are deteriorated, which is not preferable.

In the composition of the present invention, the relative weight ratio of N-acyl acidic amino acid salt (A), hydrolyzed protein (B) and nonionic surfactant (C) is also important, and (B) +
It is necessary to set the weight ratio of (C) / (A) within the range of 1/10 to 1/2.

When this ratio is 1/10 or less, the low temperature stabilizing effect is not exhibited, and when it is more than 1/2, the original desirable properties of the N-acyl acidic amino acid salt are impaired.

In the composition of the present invention, in addition to the above-mentioned components (A) to (C), if desired, an additive component that is commonly used in a general skin cleansing agent may be added within a range that does not impair the basic performance. It can be contained in an amount. As such an additive component,
Fatty agents such as higher fatty acids, higher alcohols, higher fatty acid glycerides, moisturizers such as glycerin, propylene glycol, sorbitol, polyethylene glycol, bactericides, anti-inflammatory agents, antioxidants, chelating agents, fragrances, pigments and the like.

EXAMPLES Next, the present invention will be described in more detail with reference to Examples.

The evaluation of the physical properties in each example was carried out by the following methods.

(1) Hardness of cream Leave the detergent in a constant temperature bath at 0 ° C for 10 days, and use a B-type viscometer (BH
The viscosity was measured with a mold, No. 7 rotor, 2 rpm, manufactured by Tokyo Keiki Co., Ltd. and evaluated according to the following criteria.

○: 14000p or less Moderate hardness △: 14000 to 20000p Slightly hard ×: 20000p or more Very hard (2) Appearance of cream The gloss of the cleaning agent left for 10 days in a constant temperature bath at 0 ° C and the precipitation of crystals with the naked eye The following criteria were used for measurement.

⊚: Good ○: Slightly inferior, but no precipitation of crystals, etc. Δ: Disappearance of gloss, and precipitation of fine crystals ×: Significant precipitation of crystals (3) Ease of cream production The detergent was filled in a polyethylene tube and left in a constant temperature bath at 0 ° C. for 10 days, and then the ease with which the tube was taken out was evaluated.

◎: Easy to produce ○: Slightly hard but sufficient to produce Δ: Very hard and difficult to produce ×: Very hard to produce Example 1 25 parts by weight of monosodium N-lauroylglutamate (A), 15 parts by weight of propylene glycol, 10 parts by weight of polyethylene glycol Parts, polyoxyethylene hydrogenated castor oil monostearate (C) 3 parts by weight, glycerin monostearate 1 part by weight and lauric acid 2 parts by weight, and different amounts and total amount of hydrolyzed collagen (average molecular weight 10,000) (B) A cream containing purified water up to 100 parts by weight was prepared as follows.

That is, a predetermined amount of monosodium N-lauroylglutamate, hydrolyzed collagen, propylene glycol and polyethylene glycol was put in a beaker together with purified water and mixed, and the mixture was heated and dissolved to prepare a mixture (I) at 70 ° C.

Separately, polyoxyethylene hydrogenated castor oil monostearate, glycerin monostearate and lauric acid are put into a beaker and heated and dissolved to prepare a mixture (II) at 70 ° C.

Then, the mixture (II) is added to the mixture (I), and the mixture is stirred at 70 ° C. for 10 minutes to homogenize, and then cooled to room temperature with stirring to give a creamy skin cleanser.

The physical properties of the cleaning agent thus obtained are shown in Table 1.

As you can see from this table, the amount of hydrolyzed collagen is 0.5
Less than 1 part by weight is inferior in stability at low temperature,
All of the above 5 parts by weight have excellent physical properties.

It should be noted that those containing 12 parts by weight have good stability at low temperatures, but have extremely low detergency and foaming power and are not practical.

Example 2 N-lauroyl glutamate monosodium (A) 25 parts by weight, propylene glycol 15 parts by weight, polyethylene glycol 10 parts by weight, hydrolyzed collagen (B) 2 parts by weight, glycerin monostearate 1 part by weight, lauric acid 2 parts by weight. The amount of polyoxyethylene hydrogenated castor oil monostearate (C) shown in Table 2 and purified water up to a total amount of 100 parts by weight were mixed in the same manner as in Example 1 to prepare a creamy skin cleanser. Prepared.

The stability of this product is shown in Table 2.

As can be seen from this table, when the amount of the nonionic surfactant is less than 1 part by weight, the stability at low temperature is inferior, but when it is 1 part by weight or more, all of these physical properties are excellent.
It should be noted that those containing 13 parts by weight have good stability at low temperatures, but have extremely low detergency and foaming power, and are not practical.

Example 3 A creamy skin cleansing agent was prepared in the same manner as in Example 1 using the components shown in Table 3. The low temperature stability of the sample thus obtained is shown in Table 3.

As can be seen from this table, the composition of the present invention (No. 1) using the polyoxyethylene hydrogenated castor oil fatty acid ester has good low temperature stability, but the composition using another nonionic surfactant ( No.2,3) and the ones replaced with other polymer compounds (No.4,5) did not have good low temperature stability.

Formulation Example A creamy skin cleansing agent having the following weight composition was prepared in the same manner as in Example 1. All of them showed good stability and cleanability at room temperature and low temperature.

(1) Prescription A N-myristoyl monosodium glutamate 21.0% Hydrolyzed collagen (MW 10000) 2.0% N-lauroyl-N-methyl-β-alanine sodium 30% aqueous solution 9.0% N-cocoyl-N-methyltaurine sodium 30% Aqueous solution 6.0% Myristic acid 3.0% Polyoxyethylene (30) hydrogenated castor oil triisostearate (HLB6.5) 3.0% Sorbitan monostearate 1.0% Propylene glycol 20.0% Polyethylene glycol 1500 10.0% Purified water 25.0% Perfume suitable amount ( 2) Formulation B N-lauroylglutamate mononatrium 2.5% Hydrolyzed collagen (MW 2000) 3.0% N-cocoyl-N-methyl-β-alanine sodium 30% aqueous solution 6.0% Ethylene glycol distearate ester 0.5% Monopyroglutamate monoisostester Acrylic acid POE (40) hardening Mashi 3.0% Oil (HLB 10.8) Sorbitan monostearate 0.5% Propylene glycol 15.0% Polyethylene glycol 400 8.0% Sodium pyrrolidonecarboxylate 50% Aqueous solution 5.0% Purified water 34.0% Perfume Suitable amount (3) Formula C N-lauroylglutamate mononatrium 18.0 % N-hardened tallow fatty acid monosodium glutamate 5.0% hydrolyzed keratin (MW 1000) 3.0% polyoxyethylene (40) hydrogenated castor oil monolaurate (HLB 10.5) 4.0% coconut oil fatty acid diethanolamide 1.0% glyceryl mono Stearate 0.5% Coconut oil fatty acid 3.0% Propylene glycol 20.0% Sorbitol 8.0% Sodium pyrrolidonecarboxylate 50% Aqueous solution 4.0% Citric acid 0.2% Purified water 33.3% Perfume Appropriate amount (4) Formula D N-lauroylglutamate mononatrium 20.0% N-Cocoil Gluta Mononatrium acidate 5.0% Hydrolyzed casein (MW 20000) 2.0% Polyoxyethylene (50) hydrogenated castor oil triisostearate (HLB 9.3) 2.0% Lauric acid diethanolamide 2.0% Ethylene glycol distearate 1.0% Propylene glycol 10.0% Polyethylene glycol 1500 12.0% 2,4,4'-Trichloro-2'-hydroxydiphenyl ether 0.2% Allantoin 0.2% Sodium pyrrolidonecarboxylate 50% Aqueous solution 5.0% Purified water 59.4% Perfume Suitable amount (5) Formula EN -Monocalcium lauroylglutamate 20.0% N-Myristoylmonoglutamate monopotassium 15.0% Hydrolyzed collagen (MW 10000) 4.0% POE (40) hydrogenated castor oil monopyroglutamate monoisostearate (HLB 10.8) 3.0% Lauric acid 4.0% Propylene glycol 10.0 % Glycerin 5.0 % Sorbitol 7.0% Purified water 32.0% Perfume Suitable amount

Claims (3)

[Claims] 1. A creamy skin cleansing composition comprising an N-acyl acidic amino acid salt as a main component, wherein 10 to 50% by weight of N-acyl acidic amino acid salt (A) and hydrolyzed protein (B) based on the total amount of the composition. ) 0.5-10 wt% and HLB4-12 polyoxyethylene hydrogenated castor oil fatty acid ester type nonionic surfactant (C) 1-10 wt% and (B) +
A composition characterized in that the weight ratio of (C) / (A) is in the range of 1/10 to 5/10. 2. The hydrolyzed protein has an average molecular weight of 1000 to 20.
The composition of claim 1 which is a hydrolyzate of 000 collagen proteins. 3. A polyoxyethylene hydrogenated castor oil ester type nonionic surfactant comprises polyoxyethylene hydrogenated castor oil monofatty acid ester, polyoxyethylene hydrogenated castor oil trifatty acid ester and polyoxyethylene hydrogenated castor oil pyroglutamic acid isostearic acid. Claim 1 which is at least one kind selected from esters
The composition according to the item.