JPH11180844A - Cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cosmetic with excellent moisturizing ability. SOLUTION: This cosmetic contains each an anionic surfactant bearing two- long chain bipolar group and a common surfactant, also containing an intermolecular compound composed of the above two kinds of surfactant; wherein the former surfactant, an N,N-amidodialkyl-type anionic surfactant bearing two-long-chain bipolar group, is shown by the general formula [R1 is a 8-18C long-chain hydrocarbon group; R2 is either meaningless (in this case, the two carbonyl groups are linked to each other) or a 1-6C hydrocarbon group; X and Y each has, when containing an oxyalkylene chain 1-50 in the number of addition moles, the terminals bear sulfate and phosphate groups, or when containing no such oxyalkylene chain, a 1-3C alkylene chain with the terminals bear carboxyl and sulfone groups], specifically, N,N'-bis(lauroylacido)ethane-N,N '-di(sodium propionate).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a cosmetic, and more particularly to a cosmetic having an excellent moisturizing function.

[0002]

2. Description of the Related Art The moisturizing function of cosmetics is an important factor. For this purpose, lipid and sugar derivatives having a moisturizing function have been proposed, but those which can meet the needs have not been developed yet, and improvement thereof has been desired.

[0003]

The present inventor has made intensive studies to improve such disadvantages of the prior art, and as a result,
They found that cosmetics containing an intermolecular compound consisting of a specific two-chain dipolar group-containing anionic surfactant and another anionic surfactant have a remarkably excellent moisturizing function, The present invention has been completed. That is, an object of the present invention is to provide a cosmetic having an excellent moisturizing function.

[0004]

The invention of claim 1 of the present invention is a cosmetic containing at least two kinds of anionic surfactants, one of which is a N-chain containing two long-chain dipolar groups. , N-amidodialkyl-type anionic surfactants, the other being one long-chain, one-polar group-containing anionic surfactants, and cosmetics containing these intermolecular compounds. .

Further, the invention of claim 2 of the present invention provides a two-chain
The polar group-containing N, N-amidodialkyl type anionic surfactant has a general formula (1)

[0006]

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[R ₁ is a long-chain hydrocarbon group having 8 to 18 carbon atoms, R ₂ has no meaning (in this case, two carbonyl groups are linked), or has 1 to 8 carbon atoms. 6 hydrocarbon groups, X and Y, have an addition mole number of 1 to 50.
When containing an oxyalkylene chain of, a sulfuric acid group at its terminal,
A compound having a phosphoric acid group, and having no oxyalkylene chain, having an alkylene chain having 1 to 3 carbon atoms and a carboxyl group or a sulfone group at the terminal thereof] or a general formula (2)

[0008]

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(R ₃ is a long chain hydrocarbon group having 7 to 17 carbon atoms, R ₂ is a hydrocarbon group having 1 to 6 carbon atoms, X is
And when Y contains an oxyalkylene chain having an addition mole number of 1 to 50, those having a sulfate group or a phosphate group at its terminal;
The cosmetic according to claim 1, which is represented by an alkylene chain having 1 to 3 carbon atoms and having a carboxyl group and a sulfone group at its terminal when it does not contain an oxyalkylene chain. .

A third aspect of the present invention is a cosmetic containing at least two kinds of anionic surfactants, one of which is an N, N-amide containing two long-chain two-carboxyl groups. 3. The cosmetic according to claim 1, wherein the cosmetic is a dialkyl-type anionic surfactant, and the other is a one-chain, one-carboxyl group-containing anionic surfactant.

Further, the invention according to claim 4 of the present invention provides:
A cosmetic containing at least two kinds of anionic surfactants, one of which is an N, N-amidodialkyl-type anionic surfactant containing two long-chain, two-sulfate groups, and the other is one. 3. A long-chain monosulfate or sulfone group-containing anionic surfactant.
It is a cosmetic of the description.

[0012]

Next, an embodiment of the present invention will be described. The N, N-amidodialkyl-type anionic surfactant containing two long-chain dipolar groups in the present invention has a long-chain hydrophobic group having 18, 16, 14, 12, 10, 10 or 8 carbon atoms, and has a polar group. Examples thereof include a carboxyl group, a sulfate group, a sulfone group, and a phosphate group. As a counter ion, a monovalent or divalent alkali metal ion, alkaline earth metal ion, ammonium ion, or organic ammonium ion is applied. However, the organic ammonium ion may be any basic amino acid such as lysine and arginine as long as it has this type of molecular structure. As an example, N, N'-bis (2-lauramidoethyl) ethylenediamine-N, N'-di (sodium acetate) may be mentioned. A mixture with a homologue having a different hydrophobic group in the molecular structure of the compound is also blended within the scope of the present invention. In addition to N, N'-bis (2-lauramidoethyl) ethylenediamine-N, N'-di (sodium acetate), more specifically, for example, N, N'-bis (2-myristolamidoethyl) Ethylenediamine-
N, N'-di (sodium acetate), N, N'-bis (2
-Palmitoiramidoethyl) ethylenediamine-N,
N'-di (sodium acetate), N, N'-bis (2-lauramidoethyl) ethylenediamine-N, N'-di (sodium propionate), N, N'-bis (2-myristoylamidoethyl) Ethylenediamine-N, N'-di (sodium propionate), N, N'-bis (2-palmitoiramidoethyl) ethylenediamine-N, N'-
Di (sodium propionate), N, N'-bis (lauroylamide) ethane-N, N'-di (sodium acetate), N, N'-bis (myristoylamide) ethane-
N, N'-di (sodium acetate), N, N'-bis (palmitoylamide) ethane-N, N'-di (sodium acetate), N, N'-bis (lauroylamide) ethane-
N, N'-di (sodium propionate), N, N'-
Bis (myristoylamide) ethane-N, N′-di (sodium propionate), N, N′-bis (palmitoylamido) ethane-N, N′-di (sodium propionate), N, N′-bis ( Lauroylamide) butane-
N, N'-di (potassium acetate), N, N'-bis (myristoylamide) butane-N, N'-di (potassium acetate), N, N'-bis (palmitoylamide) butane-
N, N'-di (potassium acetate), N, N'-bis (lauroylamide) ethane-N, N'-di (potassium ethanesulfonate), N, N'-bis (myristoylamide)
Butane-N, N′-di (potassium ethanesulfonate),
N, N'-bis (palmitoylamide) ethane-N,
N′-di (potassium ethanesulfonate).
In the present invention, the N, N-amidodialkyl type is
It has two N-acyl groups as long-chain hydrophobic groups, and means a molecular structure in which two methylene groups are respectively bonded to nitrogen atoms of two CONs. Therefore, the N, N-amidodialkyl-type anionic surfactant containing two long-chain dipolar groups applied to the present invention is not limited to the compounds or homologues described herein, and is known. And those having an ethylene oxide chain, for example. In particular, the compounds represented by the above formulas 3 and 4 are suitable for the present invention. The blending amount of the anionic surfactant containing two long-chain dipolar groups of the present invention in the present cosmetic is not particularly limited, but is in the range of 0.001 to 80% by weight from a practical viewpoint.

As the at least one other anionic surfactant used in addition to the above-mentioned N, N-amidodialkyl type anionic surfactant containing a two-long-chain dipolar group, specifically, a long-chain hydrophobic group Carbon number 18, 16, 14, 12, 1
0 or 8, the polar group is a carboxyl group, a sulfate group, a sulfonic group, or a phosphate group, and the counter ion is a monovalent or divalent alkali metal ion, alkaline earth metal ion, ammonium ion or organic ammonium It is an anionic surfactant containing one long chain and one polar group which is an ion. The amount of the anionic surfactant containing one long-chain and one polar group of the present invention to be added to the present cosmetic composition is not particularly limited.
001 to 80% by weight.

As the anionic surfactant containing one long chain and one polar group in the present invention, higher fatty acid salts, alkane sulfonates, α-olefin sulfonates, sulfonates of higher fatty acid esters, and sulfonic acids of higher fatty acid amides Sulfonates such as salts, sulfates such as alkyl sulfates, alkyl ether sulfates, sulfates of higher fatty acid esters, sulfates of higher fatty acid alkylolamides, and phosphates such as alkyl phosphates and alkyl ether phosphates And carboxyl group-containing N-acylamino acid-based anionic surfactants, and polyoxyethylene alkyl ether carboxylate.

In the present invention, N,
N-amidodialkyl type anionic surfactant and one long chain 1
As for the combination with the polar group-containing anionic surfactant, the same case as the case where both polar groups are different is applied. However,
In either case, an intermolecular compound must be formed between the two. Therefore, in this respect, the case where the polar groups are the same is more desirable. Also, comparing the case where both polar groups are a carboxyl group and the case of a sulfate group, the latter case is more advantageous than the former case because it can be used in a wider pH range and in a neutral region. The presence of the intermolecular compound in the present invention was determined by thermal analysis (DSC) based on the results of a thermal analysis (DSC) measurement. The N, N-amidodialkyl-type anionic surfactant containing two long-chain dipolar groups and the one long-chain one polar group were used. This was confirmed by the significant difference between the thermal analysis profiles of each of the anionic surfactants alone and those of various mixed systems.

The cosmetic composition of the present invention has the above-mentioned composition. If necessary, other surfactants, emulsifying auxiliaries, fragrances, coloring agents, preservatives, pigments, etc. may be used in the range for achieving the object of the present invention. It can also be appropriately compounded within. The present invention is a broadly defined cosmetic for skin or hair. Therefore, it also includes cleansing cosmetics.

[0017]

The present invention will be described below with reference to examples. A practical test was performed as an evaluation test for moisture retention. That is, 20
The cosmetics prepared in Examples and Comparative Examples were
Judgment was made from the results of evaluation in terms of the moisturizing effect after continuous use for weeks.

The criteria are as follows.

[0019]

[Table 1]

Examples 1 to 9, Comparative Example 1 Compound N, N'-bis (lauroylamide) ethane-N, N'-di (sodium propionate) according to the present invention
And sodium laurate at a total concentration of 500 mM, and the molar fraction of sodium laurate was 0.1, 0.2, 0.
3, 0.4, 0.5, 0.6, 0.7, 0.8,.
Prepare an aqueous solution that has been changed to 9 and 1.0. These are used as test samples of Example 1, Example 2, Example 3, Example 4, Example 5, Example 6, Example 7, Example 8, Example 9, and Comparative Example 1 in this order. These were subjected to the above evaluation test. The evaluation results are as follows.

[0021]

[Table 2]

Residues obtained by freeze-drying the aqueous solutions of Examples 2 and 8, N, N'-bis (lauroylamide) ethane-N, N'-di (sodium propionate) and laurine Thermal analysis (DSC, temperature range of -10 to 350 ° C, heating rate 1
0 / min). As a result, the thermal profiles of the samples of Example 2 and Example 8 were N, N′-bis (lauroylamido) ethane-N, N′-di (sodium propionate) and sodium laurate, respectively. Significantly different from the thermal profile. This indicates the formation of an intermolecular compound between them.

Example 10 In the above formula 4, R ₁ is a long-chain hydrocarbon group having 11 carbon atoms, R ₂ is an ethylene group, and X and Y each represent an addition mole number of 5
Oxyalkylene chain and a sulfuric acid group at the end of the compound, the counter ion is sodium ion and sodium lauryl sulfate at a total molar concentration of 50 mM, and the moisturizing property of an aqueous solution in which the molar fraction of sodium lauryl sulfate is 0.6 Was significantly better than the moisturizing properties of sodium lauryl sulfate. In the case of sodium lauryl sulfate alone, rough skin occurred. On the other hand, in the case of the mixed system, skin roughness does not occur or may occur depending on the mole fraction, but the degree is only slight. In the residue obtained by freeze-drying the aqueous solution of Example 10, and in the above Chemical Formula 4, R ₁ is a long-chain hydrocarbon group having 11 carbon atoms, R ₂ is an ethylene group, X and Y
Thermal analysis (DSC, temperature range of -10 to 350 ° C., using a compound having an oxyalkylene chain having an addition mole number of 5 and a sulfuric acid group at the end thereof and a counter ion of sodium ion and sodium lauryl sulfate as samples) Heating rate 10
/ Min). As a result, the thermal profile of the sample of Example 10 is significantly different from the thermal profiles of the two single samples constituting the sample. This indicates the formation of an intermolecular compound between them.

Example 11 In the above formula (3), R ₁ is a long-chain hydrocarbon group having 12 carbon atoms, and R ₂ has no meaning.
A compound having an oxyalkylene chain having an added mole number of 5 and a sulfuric acid group at the end thereof and having a counter ion of sodium ion and sodium lauryl sulfate having a total molar concentration of 50 mM
The moisture retention of the aqueous solution in which the molar fraction of sodium lauryl sulfate was 0.6 was significantly better than the moisture retention of sodium lauryl sulfate. In the case of sodium lauryl sulfate alone, rough skin occurred. On the other hand, in the case of the mixed system, skin roughness does not occur or may occur depending on the mole fraction, but the degree is only slight. The residue obtained by freeze-drying the aqueous solution of Example 11, and in the above chemical formula 4, R ₁ is a long-chain hydrocarbon group having 11 carbon atoms, and R ₂ does not mean anything, X and Y each have an oxyalkylene chain having an added mole number of 5 and a sulfuric acid group at its terminal;
Thermal analysis (DSC, -1) using three kinds of samples, a compound whose counter ion is sodium ion and sodium lauryl sulfate
(A temperature range of 0 to 350 ° C., and a heating rate of 10 / min). As a result, the thermal profile of the sample of Example 11 is significantly different from the thermal profiles of the two single samples constituting the sample. This indicates the formation of an intermolecular compound between them.

[0025]

As described above, it is apparent that the present invention provides a cosmetic having an excellent moisturizing function.

Claims (4)

[Claims] 1. A cosmetic containing at least two kinds of anionic surfactants, one of which is a two-long chain 2
A polar group-containing N, N-amidodialkyl-type anionic surfactant, one of which is a long-chain, one-polar group-containing anionic surfactant, containing these intermolecular compounds. Cosmetics. 2. An N, N-amidodialkyl-type anionic surfactant containing a two-chain dipolar group is represented by the general formula (1): ## STR1 ## [R ₁ is a long chain hydrocarbon group having 8 to 18 carbon atoms, R ₂
Does not mean anything (in this case, two carbonyl groups are connected), or a hydrocarbon group having 1 to 6 carbon atoms, X and Y represent an oxyalkylene chain having 1 to 50 additional moles. If it contains, it has a sulfuric acid group or a phosphoric acid group at its terminal, and if it does not contain an oxyalkylene chain, it has an alkylene chain having 1 to 3 carbon atoms and a carboxyl group or a sulfone group at its terminal.] Or the general formula (2): (R ₃ is a long-chain hydrocarbon group having 7 to 17 carbon atoms, R ₂
Is a hydrocarbon group having 1 to 6 carbon atoms, and when X and Y contain an oxyalkylene chain having an addition mole number of 1 to 50, those having a sulfuric acid group or a phosphoric acid group at the terminal, and not containing an oxyalkylene chain In this case, the cosmetic is represented by an alkylene chain having 1 to 3 carbon atoms and a carboxyl group or a sulfone group at its terminal). 3. Cosmetics containing at least two kinds of anionic surfactants, one of which is a two long chain 2
3. The cosmetic according to claim 1, which is a carboxyl group-containing N, N-amidodialkyl type anionic surfactant, and the other is a one-long chain one-carboxyl group-containing anionic surfactant. Fees. 4. A cosmetic containing at least two kinds of anionic surfactants, one of which is a two-long chain 2
3. An anionic surfactant containing a sulfate group containing an N, N-amidodialkyl type anionic surfactant, wherein the other is a one long chain, one sulfate group or a sulfone group-containing anionic surfactant. The cosmetic described.