JPH0672851A - Skin cosmetic - Google Patents

Abstract

PURPOSE:To obtain skin cosmetics having excellent moisture retention, no irritation and no greasy feeling, thus giving good application feeling with high durability, by using an amphiphilic lipid and a specific organopolysiloxane. CONSTITUTION:The objective cosmetics contain 1 to 40wt.% of an amphiphilic lipid such as phospholipid and 0.01 to 40wt.% of a compound of formula I and formula II (R<1>, R<2> are 1 to 4C alkyl; R<3> is 1 to 40C alkyl, alkenyl, fluoroalkyl; R<4> is 7 to 40C alkyl, alkenyl, fluoroalkyl; l is 2 or more; m is 3 or more and l+m is 5 to 6,000). In addition, the additives used in usual cosmetics such as salts, oil, emulsion, powder, ultraviolet scattering agent, pH adjuster, thickener, pigments, preservative, antioxidant, fungicidal or water-soluble solvents are suitably used to produce emulsion, dispersion, double-layered or solubilized preparations. Since the humectant is not flown off by sweat or water, the preparation can stay on the application site to sustain the moisture retention effect for hours.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a skin cosmetic having excellent moisturizing properties, non-irritating properties, non-greasiness, good feeling on use and 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 rough skin caused by water work, drying, rubbing and the like. These lotion emulsions, creams, etc. replenish the skin oil lost by water work, drying, rubbing, etc., and the addition of a moisturizing agent protects the skin by the action of replenishing the skin with an appropriate amount of water. It is a thing.

However, conventional lotions, emulsions and creams are easily washed away by sweat and water,
In many cases, the moisturizing component replenished to the skin was also washed away with sweat and water along with the sebum component, and the moisturizing effect was reduced over time. Further, when a large amount of a moisturizing component is added in an attempt to enhance the moisturizing effect, a sticky feeling is produced, which is not always satisfactory. In fact, many housewives suffer from rough hands because they frequently do water work such as cooking and washing. Also, many beauticians complain of dryness and inflammation caused by hair dye, perm solution, etc. in addition to rough hands caused by repeated shampooing.

[0004]

Therefore, the present invention forms a film having good spreadability, excellent moisturizing properties, and less sticky feeling and a good feeling in use, and can be easily prepared by water work or a skin washing process using soap. It is an object of the present invention to provide a skin cosmetic which can be moisturized to the skin for a long time without being washed off.

[0005]

Under the circumstances, as a result of intensive studies by the present inventors, as a result of using a combination of an amphipathic lipid as a moisturizing component and a specific organopolysiloxane, It was found that a skin cosmetic excellent in all of its durability and feeling of use can be obtained, and the present invention has been completed.

That is, the present invention comprises the following components (A) and (B): (A) amphipathic lipid, (B) in the molecule

[0007]

[Chemical 2]

(R ¹ and R ² each represent an alkyl group having 1 to 4 carbon atoms, and R ³ represents a linear, branched or cyclic alkyl group having 1 to 40 carbon atoms, an alkenyl group or a fluoroalkyl group. , R ⁴ represents a linear, branched or cyclic alkyl group, alkenyl group or fluoroalkyl group having 7 to 40 carbon atoms, l represents a number of 2 or more, m represents a number of 3 or more, and further l + m The present invention provides a skin cosmetic, comprising: an organopolysiloxane having a value of 5 to 6000).

The amphipathic lipid (A) in the present invention is
It is a solid substance having a hydrophobic portion and a hydrophilic portion in one molecule, and specific examples thereof include phospholipids, ceramides, sugar ceramides, ceramide-like structural substances and the like. The ceramide-like structural material referred to here is a lipid that has two long-chain hydrocarbon groups and an OH group and an amide group between them, and that the molecule can have a one-dimensional conformation. Says a derivative. Examples of such compounds include those represented by the following general formula (1) described in JP-A-62-228048.

[0010]

[Chemical 3]

(In the formula, R ⁵ is a linear or branched saturated or unsaturated hydrocarbon group having 10 to 26 carbon atoms, and R ^{6 is}
Represents a linear or branched saturated or unsaturated hydrocarbon group having 9 to 25 carbon atoms)

These amphipathic lipids (A) can be used alone or in combination of two or more, and are contained in 1.0 to 40.0% by weight (hereinafter simply referred to as% by weight) in the total composition of the skin cosmetic of the present invention. It is preferable to add 3.0 to 20.0%.

In the present invention, the organopolysiloxane as the component (B) has a function of maintaining the moisturizing action of the amphipathic lipid as the component (A), and has a feeling of use such as stickiness and skin feel after washing. It has the effect of improving.

The component (B) organopolysiloxane used in the present invention has at least 3 hydrocarbon groups having 7 to 40 carbon atoms in one molecule. The molecular form of the organopolysiloxane may be linear, branched or cyclic.

R contained in the organopolysiloxane (B)
Examples of the alkyl group represented by ¹ and R ² include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, and an n-butyl group, but a methyl group is preferable. Also,
The alkyl, alkenyl or fluoroalkyl group represented by R ³ and R ⁴ may be linear, branched or cyclic, but R ³ is an alkyl group having 1 to 4 carbon atoms, and R ⁴ has 7 to 40 carbon atoms (more preferably 12 to
22 and particularly preferably 16 to 18) alkyl group, alkenyl group or fluoroalkyl group. Specific examples of R ⁴ include octyl, nonyl, decyl,
Undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, triacontyl, tetratriacontyl, octatriacontyl, tetracontyl,
2-heptyl undecyl, 2-undecyl pentadecyl, 2-decyl tetradecyl, 2-decyl pentadecyl, 2-ethylhexyl, 2-octyl dodecyl, 2-
Undecyl tetradecyl, methyl-branched isostearyl,
Examples thereof include methyl-branched dodecyl (propylene tetramer) and methyl-branched nonyl (propylene trimer) groups.
Also, l + m is 5 to 6000, but 200 to 300
0 is preferable, and further, l = m = 150 to 7
It is preferable that 1 + m is 50 to 300 and 1500. Here, l and m are obtained as an average degree of polymerization calculated from the weight average molecular weight.

The organopolysiloxane (B) is
Those having a melting point of 10 to 50 ° C, particularly 20 to 40 ° C are preferable. The melting point of the organopolysiloxane was measured using a differential scanning calorimeter (DSC).

The organopolysiloxane (B) may have a structure having both the polysiloxane units at any position in the molecule, but from the viewpoint of easy production,
It is preferable that each unit is directly bonded to each one block, and both terminal residues are bonded to the unit to have a simple structure. Further, it is preferable that the both-terminal residues -OSiR ⁷ R ⁸ R ⁹ in which (R ⁷ to R ⁹ is an alkyl group having 1 to 4 carbon atoms) is.

Specific examples of the organopolysiloxane (B) include those represented by the following general formula (2).

[0019]

[Chemical 4]

Commercially available products of the organopolysiloxane (B) include XF42-A7154 and XF42-A504.
8, XF42-A5047 [manufactured by Toshiba Silicone Co., Ltd.]
Etc. can be used.

The above organopolysiloxane (B) can be used alone or in combination of two or more kinds,
The blending amount in the skin cosmetic of the present invention varies depending on the blending amount of the amphipathic lipid (A), but is usually 0.01% to 40.0%,
It is particularly preferable that the amount is 2 to 20%.

In the skin cosmetic of the present invention, in addition to the above-mentioned essential components, salts, oils, emulsifiers, which are usually used in cosmetics,
Powders, UV scattering agents, pH adjusters, thickeners, pigments, preservatives, antioxidants, UV absorbers, fragrances, chelating agents, astringents, bactericides, activators, etc., ethanol, glycerin, etc. The water-soluble solvent can be added 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 dosage form such as an emulsion type, a dispersion type, a two-layer type and a solubilizing type.

[0023]

EFFECTS OF THE INVENTION The skin cosmetics of the present invention have excellent moisturizing properties, good feeling of use without irritation or stickiness, and moisturizing ingredients remain on the application site for a long time without being washed away by sweat or water, and have a moisturizing effect. Persists.

[0024]

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

Example 1 Of the compositions shown in Tables 1 to 4, all components except purified water and a water-soluble solvent were dissolved by stirring at 70 to 80 ° C. and then stirred at 70 to 8
Purified water at 0 ° C. and a water-soluble solvent were added and cooled with continuous stirring to obtain each cream. The obtained cream was subjected to a practical test and a skin moisturizing effect test based on the following test methods.

(1) Practical test (panel test) We asked 10 female panelists to use it on the skin after washing,
The feeling of use was evaluated based on the following criteria. The evaluation items are two items, namely, the degree of stickiness during application and the moist feeling of the hand skin after soap washing. The evaluation results are based on the following three criteria
It shows in Table 1-4. ⊚: 9 or more out of 10 people answered good. ◯: 6 to 8 out of 10 respondents answered good. Δ: 3 to 5 out of 10 people answered good. X: Less than 3 out of 10 people 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 inside of the forearm, and degreasing treatment was performed for 10 minutes to induce rough skin. . Table 1 on rough skin
The 5 kinds of samples shown in (1) are uniformly applied (20 μl / 3.1).
4 cm ² ) and dried for 10 minutes. Immediately after drying and after being kept at 20 ° C. and 40% RH for 24 hours, the skin surface conductance was measured to evaluate the water retention ability. It should be noted that 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 Tables 1 to 4 according to the following three-stage criteria. ◯: Equal to or higher than the skin surface conductance value of normal skin. Δ: Slightly lower than the skin surface conductance value of normal skin. X: Remarkably lower than the skin surface conductance value of normal skin.

[0028]

[Table 1]

[0029]

[Table 2]

[0030]

[Table 3]

[0031]

[Table 4]

1): Octadecyl-modified silicone [in the formula (2), l = 750, m = 750, R ⁴ = C ₁₈ H ₃₇ ] 2): Octadecyl-modified silicone [in the formula (2), l =
^{500, m = 500, R 4} = C 18 H 37 ] 3): During octadecyl-modified silicone [formula (2), l =
50, m = 50, R ⁴ = C ₁₈ H ₃₇ ] 4): Hexadecyl-modified silicone [in the formula (2), l =
^{500, m = 500, R 4} = C 16 H 33 ] 5): in hexadecyl-modified silicone [formula (2), l =
75, m = 75, R ⁴ = C ₁₆ H ₃₃ ] 6): octyl-modified silicone [in the formula (2), l = 75]
0, m = 750, R ⁴ = C ₈ H ₁₇ ] 7): docosyl-modified silicone [in the formula (2), 1 = 50]
^{0, m = 500, R 4} = C 22 H 45 ] 8): amide derivatives 9 of Example 1 of JP 62-228048 JP): dimethylsiloxane-methyl (polyoxyethylene-polyoxypropylene) siloxane copolymer Polymer (Toray Dow Corning Silicone, BY-22-0
12)

As can be seen from Tables 1 to 4, the skin cosmetics of the present invention have a better feeling in use and a longer lasting moisturizing effect than the comparative products.

Example 2 (milky lotion)

[0035]

[Table 5] (Composition) (%) (1) Dimethylsiloxane-methyl (polyoxyethylene-polyoxypropylene) copolymer 0.5 (2) Octadecyl-modified silicone ¹⁾ 3.0 (3) Octamethylcyclotetra Siloxane 10.0 (4) Cerebroside (manufactured by Nacalai Tesque) 2.0 (5) Glyceryl monooleate 1.5 (6) Glyceryl monostearate 1.0 (7) Polyoxyethylene (20) sorbitan monostearate 1 .5 (8) 1,3-butylene glycol 10.0 (9) Purified water balance 1): octadecyl-modified silicone [in the formula (2), l = 7
50, m = 750, R ⁴ = C ₁₈ H ₃₇ ]

(Production method) (1) to (6) are mixed, heated and dissolved to maintain an oil phase of 70 ° C. Separately (7)-(9)
Is melted by heating and kept at 70 ° C. to form an aqueous phase. The oil phase portion is added to this water phase portion and sufficiently emulsified by an emulsifying machine. After emulsification, cool while stirring to obtain a product.

The milky lotion had a refreshing feeling of use.

Example 3 (essence)

[0039]

[Table 6] (Composition) (%) (1) Ethanol 10.0 (2) Octadecyl-modified silicone ¹⁾ 2.0 (3) Carboxyvinyl polymer (Carbopol) 0.3 (4) L-arginine 0.3 (5) Soybean lecithin (LS-60, manufactured by Nisshin Oil Co., Ltd.) 1.0 (6) Linoleic acid 0.3 (7) Glycerin 10.0 (8) Dipropylene glycol 25.0 (9) Oleyl alcohol 0. 2 (10) L-ascorbic acid 0.5 (11) Purified water balance 1): Octadecyl-modified silicone [in the formula (2), l = 7
50, m = 750, R ⁴ = C ₁₈ H ₃₇ ]

(Production method) (1) to (11) are dissolved by heating at 70 ° C. This essence had a refreshing and moisturizing feel.

Example 4 (nutrition cream)

[0042]

[Table 7] (Composition) (%) (1) Dimethylsiloxane / methyl (polyoxyethylene / polyoxypropylene) copolymer 3.0 (2) Stearic acid 3.0 (3) Squalane 10.0 (4) Octadecyl-modified silicone ¹⁾ 10.0 (5) Isopropyl myristate 2.0 (6) Glyceryl monostearate 2.0 (7) Glutamic acid derivative (Eldew CL-301 manufactured by Ajinomoto Co., Inc.) 5.0 (8) Dipropylene glycol 3.0 (9) Polyoxyethylene methyl glucoside ether (EO 10 mol) 1.0 (10) Purified water balance 1): Octadecyl-modified silicone [in the formula (2), l = 7
50, m = 750, R ⁴ = C ₁₈ H ₃₇ ]

(Production method) (1) to (7) are heated and melted at 70 ° C. to form an oil phase part. Separately, (8) to (10) are dissolved by heating and kept at 70 ° C. to form an aqueous phase part. The oil phase part is added to this water phase part to be sufficiently emulsified by an emulsifying machine. After emulsification, cool while stirring to obtain a product. The cream had a non-greasy, moisturizing feel.

Claims (1)

[Claims] 1. The following components (A) and (B): (A) amphipathic lipid, (B) in the molecule: (R ¹ and R ² each represent an alkyl group having 1 to 4 carbon atoms, R ³ represents a linear, branched or cyclic alkyl group, alkenyl group or fluoroalkyl group having 1 to 40 carbon atoms, R ⁴ Represents a linear, branched or cyclic alkyl group, alkenyl group or fluoroalkyl group having 7 to 40 carbon atoms, l represents a number of 2 or more, m represents a number of 3 or more, and further l + m = 5 to 5 6000) is contained in the organopolysiloxane.