JP3234659B2 - Skin cosmetics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a skin cosmetic which has excellent moisturizing properties, has no irritating property or stickiness, has a good feeling in use, and has high durability.

[0002]

2. Description of the Related Art Conventionally, lotions, emulsions, creams and the like have been widely used for the purpose of protecting the skin from roughening due to water work, drying, friction and the like. These lotions, creams, etc. replenish the sebum lost by water work, drying, rubbing, etc., and further protect the skin by the action of replenishing the skin with appropriate moisture by adding a moisturizer. Things.

[0003] However, conventional lotions, emulsions, and creams are easily washed away by sweat or water.
In many cases, the moisturizing component supplied to the skin also decreased with time, such as flowing with sweat or water together with the sebum component. In addition, if a large amount of moisturizing component is added to improve the moisturizing effect, the feeling of sticky use is obtained, and it is not always satisfactory. In fact, many housewives are suffering from rough hands because they frequently perform water tasks such as cooking and washing. In addition, many hairdressers complain of dryness and inflammation due to hair dyes, perm solution, etc. in addition to rough hands due to repeated shampooing.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention forms a film having good spreadability, excellent moisturizing properties and a low feeling of stickiness and a good feeling of use, and can be easily formed by water work or a skin washing process using soap. An object of the present invention is to provide a skin cosmetic that can provide a moisturizing effect to the skin for a long time without being washed away.

[0005]

Under such circumstances, the present inventors have conducted intensive studies, and as a result, have found that a specific amphiphilic lipid as a moisturizing component and a specific copolymer of two (meth) acrylate derivatives are used. By using in combination with coalescence,
The present inventors have found that a skin cosmetic excellent in all of the moisturizing property, the durability and the feeling of use can be obtained, and have completed the present invention.

That is, the present invention provides a skin cosmetic containing the following components (A) and (B). (A) amphipathic lipid selected from cholesterol, cholesterol fatty acid ester, ceramide, sugar ceramide, ceramide-like structural substance (B) one or more copolymers of the following (1) and (2) (1) ) Long-chain alkyl (meth) acrylates which are esters of alcohols having 8 or more carbon atoms and (meth) acrylic acid (2) (meth) acrylates having a perfluoroalkyl group or a polyfluoroalkyl group having 4 or more carbon atoms

The amphiphilic lipid (A) in the present invention is
It is a solid substance having a hydrophobic part and a hydrophilic part in one molecule, and is specifically selected from cholesterol, cholesterol fatty acid ester, ceramide, sugar ceramide, and ceramide-like structural substance. The ceramide-like structural substance referred to herein is a lipid derivative having two long-chain hydrocarbon groups, a hydroxyl group and an amide group between them, and the molecule being able to adopt a one-dimensional conformation. Say Examples of such compounds include those represented by the following general formula (1) described in JP-A-62-228048.

[0008]

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[0009] (In the formula, R ¹ represents a straight-chain or branched-chain saturated or unsaturated hydrocarbon group of 10-26 carbon atoms, R ²
Represents a linear or branched saturated or unsaturated hydrocarbon group having 9 to 25 carbon atoms)

These amphiphilic lipids (A) can be used alone or in combination of two or more, and are contained in the total skin cosmetic composition of the present invention in an amount of 1.0 to 40.0% by weight (hereinafter simply referred to as%). ), And particularly preferably 3.0 to 20.0%.

In the present invention, the copolymer of the component (B) has a function of maintaining the moisturizing action of the amphiphilic lipid of the component (A), and has a sticky feeling, a feeling of use of the skin after washing, and the like. Has the effect of improving

The component (B) used in the present invention includes:
For example, those described in JP-A-3-46444 are mentioned. The long-chain alkyl (meth) acrylate (1), which is one of the raw materials of the component (B), is an ester of a straight-chain or branched-chain alcohol having 8 or more carbon atoms and (meth) acrylic acid. Examples of the alcohol include octyl alcohol, decyl alcohol, lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, eicosyl alcohol, behenyl alcohol, seryl alcohol, and melisyl alcohol. Number 1
8-32 alcohols are preferred.

The (meth) acrylate (2) having a perfluoroalkyl group having 4 or more carbon atoms or a polyfluoroalkyl group, which is the other raw material of the component (B), includes:
For example, the following are mentioned.

[0014]

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The component (B) used in the present invention is a copolymer of the above (1) and (2). The polymerization ratio (1) :( 2) is 10: 1 to 1 by weight. : 5, particularly preferably 7: 1 to 1: 1 in terms of low stickiness and solubility.

The molecular weight of the copolymer (B) is preferably from 1,000 to 2,000,000, particularly preferably from 10,000 to 2,000,000, in consideration of the friction resistance and stickiness of the obtained cosmetic. 000 to 500,000 are preferred.

The copolymer of component (B) may be used alone or in combination of two or more. The amount of the copolymer in the skin cosmetic of the present invention varies depending on the amount of the amphipathic lipid (A). Usually, it is desirably 0.01% to 40.0%, particularly 0.1 to 20%.

In the skin cosmetic of the present invention, in addition to the above essential components, salts, oils, emulsifiers and the like usually used in cosmetics are used.
Powders, UV scattering agents, pH adjusters, thickeners, pigments, preservatives, antioxidants, UV absorbers, fragrances, chelating agents, astringents, bactericides, activating agents such as activators, ethanol, glycerin, etc. Can be blended within a range that does not impair the effects of the present invention. Furthermore, the skin cosmetic of the present invention can be produced by a conventional method, and its dosage form includes any type such as an emulsion type, a dispersion type, a two-layer type, and a solubilized type.

[0019]

The skin cosmetics of the present invention have excellent moisturizing properties, are free from irritation and stickiness, have a good feeling of use, and moisturizing ingredients remain on the application site for a long time without being washed away by sweat or water. Lasts.

[0020]

The present invention will be described in more detail with reference to the following examples, which do not limit the present invention in any way.

Example 1 After stirring and dissolving all components of the composition shown in Table 1 except for purified water and a water-soluble solvent at 70 to 80 ° C., add purified water and a water-soluble solvent at 70 to 80 ° C. with stirring. While continuing to cool, each emulsion was obtained. The obtained emulsion was subjected to a practical test and a skin moisturizing effect test based on the following test methods.

(1) Practical test (panel test) Ten female panelists used the skin after cleaning,
The usability was evaluated according to the following criteria. The evaluation items were two items of low stickiness at the time of application and moist feeling of the hand skin after washing with soap. Evaluation results are based on the following three-level criteria.
It is shown in Table 1. ○: 6 or more out of 10 respondents answered “good”. Δ: 3 to 5 out of 10 respondents answered that they were good. ×: Less than 3 out of 10 respondents answered “good”.

(2) Skin Moisturizing Effect Test A glass cup (inner diameter 2 cm) containing acetone / ether (volume ratio 1: 1) was attached to the inner side of the human forearm, and degreased for 10 minutes to induce rough skin. . The five samples shown in Table 1 were uniformly applied to the rough skin (20 μl / 3.14)
cm ² ) and dried for 10 minutes. Immediately after drying, and 2
After being kept at 0 ° C. and 40% RH for 24 hours, the skin surface conductance was measured to evaluate the water retention ability. The higher the skin surface conductance value, the higher the water retention amount, and thus the higher the moisturizing effect. The evaluation results are shown in Table 1 according to the following three-step criteria. ：: Equal to or higher than the skin surface conductance value of healthy skin. Δ: Slightly lower than the skin surface conductance value of healthy skin. ×: significantly lower than skin surface conductance value of healthy skin.

[0024]

[Table 1]

As is clear from Table 1, the skin cosmetics of the present invention have a better feeling of use and a longer lasting moisturizing effect than the comparative products.

Example 2 (Emulsion)

[0027]

[Table 2]

(Preparation method) (1) to (6) are mixed, heated and dissolved, and kept at 70 ° C. to obtain an oil phase. Separately (7)-(9)
Is heated and dissolved at 70 ° C. to obtain an aqueous phase. The oil phase is added to the aqueous phase and sufficiently emulsified by an emulsifier. After emulsification, cool while stirring to obtain a product.

The emulsion had a refreshing feel on use.

[0030]

[0031]

[0032]

[0033]

[0034]

[0035]

[0036]

[0037]

[0038]

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroshi Ota 3 Kao dormitory, Asahigaoka-cho, Hanamigawa-ku, Chiba City, Chiba Prefecture (56) References JP-A-4-100534 (JP, A) JP-A-61-289009 ( JP, A) JP-A-4-210613 (JP, A) JP-A-4-89422 (JP, A) JP-A-4-89418 (JP, A) JP-A-4-221306 (JP, A) JP 62-228048 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A61K ^7/ 00-7/50

Claims (1)

(57) [Claims] 1. A skin cosmetic comprising the following components (A) and (B): (A) amphipathic lipid selected from cholesterol, cholesterol fatty acid ester, ceramide, sugar ceramide, ceramide-like structural substance (B) one or more copolymers of the following (1) and (2) (1) ) Long-chain alkyl (meth) acrylates which are esters of alcohols having 8 or more carbon atoms and (meth) acrylic acid (2) (meth) acrylates having a perfluoroalkyl group or a polyfluoroalkyl group having 4 or more carbon atoms