JPH0672853A - Skin cosmetic - Google Patents

Abstract

PURPOSE:To obtain a skin cosmetic, comprising a polyhydric alcohol and a specific organopolysiloxane as a humectant ingredient and capable of sustaining humectant effects without any irritation and stickiness and good in feeling of use. CONSTITUTION:The objective skin cosmetic is obtained by including 0.1-40wt.% polyhydric alcohol (e.g. glycerol) and 0.01-40wt.% organopolysiloxane of formulas I and II [R<1> and R<2> are 1-4C alkyl; R<3> is 1-40C alkyl, alkenyl or fluoroalkyl; R<4> is 7-40C alkyl, alkenyl or fluoroalkyl; (l) is >=2; (m) is >=3 and (l+m) is 5-6000]. Furthermore, an oiling agent, an emulsifying agent, powder, an ultraviolet ray scattering agent, a pH adjustor, a thickening agent, a coloring matter, a preservative, an antioxidant, an ultraviolet absorber, a perfume, a germicide, a chelating agent, an alcohol, etc., usually used in a cosmetic are suitably blended and this cosmetic can be prepared into a dosage form such as an emulsion type, a dispersion type, a two-layer type or a solubilized type. This cosmetic is not washed away even by kitchen work and washing with a soap, but resistant to perspiration and sustains the humectant effects for a long period.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention maintains good moisturizing properties,
Moreover, the present invention relates to a skin cosmetic which has no irritation or stickiness and is excellent in usability.

[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 cosmetics serve to protect the skin by replenishing sebum lost due to water work and the like, and by adding a moisturizing agent, the skin retains an appropriate amount of water.

However, conventional cosmetics such as lotions, milky lotions, and creams are easily washed away by sweat or water, and the moisturizing effect remains small. For this reason,
Even if such cosmetics are used, housewives who frequently perform water work such as cooking and washing often suffer from rough hands. Also, many beauticians complain of dryness and inflammation due to hair dye, perm solution, etc. in addition to rough hands caused by repeated shampooing.

On the other hand, if a large amount of a moisturizing component is added to improve the moisturizing effect in order to solve such a drawback, the feeling of use such as stickiness is deteriorated and a satisfactory cosmetic cannot be obtained.

[0005]

SUMMARY OF THE INVENTION Therefore, the object of the present invention is that it is less sticky, has a good feeling in use, is not easily washed off even by water work, a skin washing process using soap, etc. It is intended to provide a skin cosmetic which has a strong and long-lasting moisturizing effect.

[0006]

Under the circumstances, the inventors of the present invention have conducted diligent research and as a result, as a moisturizing component,
By using a combination of polyhydric alcohol and specific organopolysiloxane, excellent moisturizing effect lasts,
Moreover, they have found that a skin cosmetic having a good feeling in use can be obtained, and completed the present invention.

That is, the present invention provides the following components (A) and (B): (A) polyhydric alcohol, (B) in the molecule.

[0008]

[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 polyhydric alcohol as the component (A) used in the skin cosmetic of the present invention is not particularly limited as long as it is water-soluble and has two or more hydroxyl groups, but ethylene glycol, propylene glycol, Dipropylene glycol, 1,3-butylene glycol,
Glycols such as 1,4-butylene glycol and their alkyl ethers; glycerin, diglycerin,
Glycerin such as triglycerin; saccharides such as maltose, maltitol, sucrose, fructose, xylitol, sorbitol, maltotriose, threitol, erythritol, glucose; polyethylene glycol,
Examples thereof include polyoxyethylene methyl glucoside.
These polyhydric alcohols can be used alone or in combination of two or more. When two or more are used, a polyhydric alcohol having a total carbon number of 2 to 4 is combined with other polyhydric alcohol. Is preferred. As a specific combination, (1) a combination of a polyhydric alcohol having a total carbon number of 2 to 4 and a polyhydric alcohol having a total carbon number of 5 to 12,
(2) Polyhydric alcohol having 2 to 4 total carbons and 13 total carbons
Examples include combinations with the above polyhydric alcohols, (3) combinations of polyhydric alcohols having 2 to 4 total carbon atoms, polyhydric alcohols having 5 to 12 total carbon atoms, and polyhydric alcohols having 13 or more total carbon atoms. In addition, when only 1 type of polyhydric alcohol is mix | blended, it is preferable to use polyhydric alcohol of total carbon number 2-4. The polyhydric alcohol is preferably incorporated in the cosmetic of the present invention in an amount of 0.1 to 40% by weight, particularly 2 to 20% by weight. If the blending amount of the polyhydric alcohol is too small, sufficient moisturizing properties cannot be obtained, while if it is too large, stickiness tends to occur.

The organopolysiloxane of the component (B) used in the present invention improves the stickiness of the polyhydric alcohol of the component (A), the unpleasant feeling of the skin after washing, and the durability of the composition. It has an improving effect and has at least three hydrocarbon groups having 7 to 40 carbon atoms in one molecule. This organopolysiloxane may be branched or cyclic.

R contained in the organopolysiloxane (B)
Examples of the alkyl group represented by ¹ and R ² include a methyl group,
Examples thereof include an ethyl group, n-propyl group, isopropyl group and n-butyl group, with a methyl group being preferred. 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 is preferably an alkyl group, an alkenyl group or a fluoroalkyl group having 7 to 40 carbon atoms (more preferably 12 to 22 and particularly preferably 16 to 18). 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-heptylundecyl, 2-undecylpentadecyl, 2-decyltetradecyl, 2-decylpentadecyl, 2-ethylhexyl, 2-octyldodecyl, 2-undecyl. Examples thereof include tetradecyl, methyl-branched isostearyl, methyl-branched dodecyl (propylene tetramer), and methyl-branched nonyl (propylene trimer) groups. Also, l + m is 5 to 6000, but 2
It is preferably from 00 to 3000, and further, l = m
= 150 to 750, and 1 + m is preferably 300 to 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 above polysiloxane units at any position in the molecule, but from the viewpoint of ease of 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 that are ^{-OSiR 5 R 6 R 7 (R} 5 ~R 7 represents an alkyl group having 1 to 4 carbon atoms). Specific examples of the organopolysiloxane (B) include those represented by the following general formula (1).

[0015]

[Chemical 3]

(In the formula, l, m and R ⁴ have the same meanings as described above.) Commercially available products represented by the general formula (1) are:
Toshiba Silicone Co., Ltd. XF42-A7154, XF
42-A5048, XF42-A5047 and the like.

These organopolysiloxanes (B)
May be blended alone or in combination of two or more into the skin cosmetic of the present invention, and the blending amount thereof is usually 0.01 to 4
It is preferably 0% by weight, particularly preferably 2 to 20% by weight.
If the amount is less than 0.01% by weight, the feeling of use and the sustainability of the moisturizing effect are insufficient, and if the amount is more than 40% by weight, the feeling of use such as spreadability and stickiness is deteriorated and the product of the present invention is deteriorated. It is not preferable because the storage stability will decrease.

In addition to the above-mentioned essential components, the skin cosmetic of the present invention may optionally contain, within a range that does not impair the effects of the present invention.
Oils, emulsifiers, powders, UV scattering agents, pH adjusters, thickeners, pigments, preservatives, antioxidants, UV absorbers, fragrances, chelating agents, astringents, bactericides, which are used in ordinary cosmetics. An activator, a monohydric alcohol such as ethanol or isopropyl alcohol, etc. may be added. Further, the dosage form of the skin cosmetic of the present invention is not particularly limited, and it may be an ordinary cosmetic dosage form such as an emulsion type, a dispersion type, a two-layer type, a solubilizing type.

[0019]

The skin cosmetic of the present invention has little stickiness and irritation, has a good feeling in use, is strong against water and sweat, and has a long-lasting moisturizing effect.

[0020]

EXAMPLES Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto.

Example 1 Creams having the compositions shown in Tables 1 and 2 were produced. That is, among the components shown in Table 1 and Table 2, all components except purified water and polyhydric alcohol are dissolved by stirring at 70 to 80 ° C., and then purified water and polyhydric alcohol at 70 to 80 ° C. are added under stirring. Then, the mixture was cooled while continuing stirring to obtain each cream. Each of the obtained creams was tested and evaluated by the following test method. The results are shown in Tables 1 and 2. (1) Usability test We asked 10 female panelists to use it on the skin after washing,
The feeling of use was evaluated according to the following criteria. The evaluation items are three items: good spreadability during application, low stickiness, and moisturized hand skin after soap washing. The evaluation result complies with the following three-stage criteria. ◎: 9 or more out of 10 who answered good ○: 6 to 8 out of 10 who answered good △: 3 to 5 out of 10 who answered good ×: answered good Less than 3 out of 10 (2) Skin moisturizing effect test Wear a glass cup (inner diameter 2 cm) containing acetone / ether (volume ratio 1: 1) on the inside of the forearm and degrease it for 10 minutes. Induced rough skin. The four types of samples shown in Table 1 were evenly applied to the rough skin (20 μl / 3.14).
cm ² ) and dried for 10 minutes. 20 ° C, 40% R
The skin surface conductance was measured with time at H 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 result complies with the following three-stage criteria. ○: Equal to or higher than the skin conductance value of healthy skin △: Slightly lower than the skin conductance value of healthy skin ×: Remarkably lower than the skin conductance value of healthy skin

[0022]

[Table 1]

[0023]

[Table 2]

[0024]

[Table 3] (Notes in Tables 1 and 2) 1): In the formula (1), l = 750, m = 750, R ⁴ = C
₁₈ H ₃₇ 2): In the formula (1), l = 500, m = 500, R ⁴ = C
₁₈ H ₃₇ 3): In the formula (1), l = 50, m = 50, R ⁴ = C ₁₈ H
₃₇ 4): In the formula (1), l = 500, m = 500, R ⁴ = C
₁₆ H ₃₃ 5): In the formula (1), l = 75, m = 75, R ⁴ = C ₁₆ H
₃₃ 6): In the formula (1), l = 750, m = 750, R ⁴ = C ₈
H ₁₇ 7): In the formula (1), l = 500, m = 500, R ⁴ = C
₂₂ H ₄₅₈ ): dimethyl siloxane / methyl (polyoxyethylene / polyoxypropylene) siloxane copolymer (Toray Dow Corning Silicone Co., BY-22-0
12)

[0025]

[Table 4] Example 2 Moisturizing emulsion composition: (% by weight) (1) Maltitol 1.5 (2) Hexadecyl-modified silicone ¹⁾ 3.0 (3) Octamethylcyclotetrasiloxane 10.0 (4) Dimethylsiloxane -Methyl (polyoxy ethylene polyoxypropylene) copolymer 0.3 (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) glycerin 5.0 (10) purified water balance 1): hexadecyl-modified silicone [in the formula (1), l = 7
50, m = 750, R ⁴ = C ₁₆ H ₃₃ ]

Manufacturing method: (1) to (6) are mixed, dissolved by heating and kept at 70 ° C. to form an oil phase part. Separately (7)-(10)
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, the product was cooled with stirring. The emulsion was a refreshing feel to use.

[0027]

[Table 5] Example 3 Moisturizing cream composition: (% by weight) (1) Glycerin 5.0 (2) Dextrin palmitate 2.0 (3) Squalane 10.0 (4) Octadecyl-modified silicone ¹⁾ 10.0 ( 5) Isopropyl myristate 2.0 (6) Glyceryl monostearate 2.0 (7) Dimethylsiloxane / methyl (polyoxyethylene / polyoxypropylene) copolymer ²⁾ 0.3 (8) Dipropylene glycol 3.0 (9) Polyoxyethylene methyl glucoside ether (EO10 mol) 1.0 (10) Purified water balance 1): Octadecyl-modified silicone [in the formula (1), l = 7
^{50, m = 750, R 4} = C 18 H 37 ] 2): Dow Corning Toray Silicone Co., Ltd. (BY-
22-012)

Manufacturing 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, the product was cooled with stirring. This cream had a moisturizing feel without being sticky.

Claims (1)

[Claims] 1. The following components (A) and (B): (A) a polyhydric alcohol, (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.