JP2967139B2 - Skin cosmetics - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a skin cosmetic, and more particularly to a skin cosmetic that protects skin from rough skin (mainly rough hands) due to water work or the like.

[Technical background of the invention and its problems]

Conventionally, hand creams have been widely used to protect the skin from rough skin due to water work or the like. The hand cream replenishes sebum lost by water work and the like, and further imparts flexibility to the skin by adding a moisturizer and water.

However, conventional hand creams have a drawback that they are easily washed away by washing with water, and the skin protection effect is not always satisfactory.

In fact, many housewives are suffering from rough hands due to repeated water work such as cooking and washing. In dentists who frequently wash their hands, hand cream cannot be used because they must not adhere to treatment tools or patients, and the hands become rough. In severe cases, unpleasant skin irritation often occurs. Also, many barbers complain of inflammation due to hair dyes and perm solution in addition to rough skin due to hand washing.

As a skin cosmetic technique for a person engaged in such a rough occupation, there is a technique in which a diorganopolysiloxane having a terminal trimethylsilyl group having a relatively high viscosity and a silicone resin are combined to form a composition. But,
When applied to the skin, it has a drawback that it has a strong sticky feeling and adheres remarkably to a contact object.

JP-B-63-183515 discloses a composition using a high-molecular-weight silicone.However, since the film is easily peeled off by washing with water or the like, the durability is insufficient, and good water repellency is obtained. There was a disadvantage that there was no.

[Object of the invention]

An object of the present invention is to provide a skin cosmetic composition which gives a soft and smooth feel, has excellent water resistance, and forms a skin protective film which is not easily washed away by water.

[Configuration of the invention]

The present inventors have conducted intensive studies to overcome such drawbacks, and as a result, have found that the above object can be achieved by blending a special silicone resin, and have accomplished the present invention.

That is, the present invention relates to (a) substantially the general formula (Where R is a substituted or unsubstituted monovalent or different monovalent hydrocarbon group, X is a hydroxyl group or a hydrolyzable group, and n is 10 to
One or two or more polydiorganosiloxanes (hereinafter, referred to as component (a)) represented by the following formula: (b) a siloxane unit represented by the formula R ₃ SiO _0.5;
A copolymer comprising a siloxane unit represented by O ₂ (where R is a substituted or unsubstituted monovalent or different monovalent hydrocarbon group), wherein a hydroxyl group or a hydrolyzable group bonded to a silicon atom in one molecule; A skin cosmetic comprising an organic silicone resin obtained by condensing one or more polyorganosiloxanes having at least one (hereinafter referred to as component (b)).

The polydiorganosiloxane (a) used in the present invention substantially has a hydroxyl group or a hydrolyzable group at both ends. As the hydrolyzable group, an alkoxy group,
Examples of condensation reactive groups such as a ketoxime group and an aminoxy group include a methoxy group, an ethoxy group, a propoxy group,
Alkoxy groups such as butoxy groups are common. It is substantially linear, but may contain up to 10% of branches. The average degree of polymerization n is 10 to 20,000,
It is equivalent to about 700 to 1,500,000 in terms of molecular weight.

Component (b), which is a raw material of the organic silicone resin used in the present invention, is well known to those skilled in the art, and includes, for example, water glass, orthoethyl silicate, and ethyl polysilicate constituting SiO ₂ units. At least one and, trimethylchlorosilane constituting the R ¹ ₃ SiO _0.5 units, trimethyl methoxy silane, triphenyl chlorosilane, phenyl dimethyl methoxysilane, dimethyl vinyl chlorosilane, cohydrolysis condensation of at least one silane, such as dimethyl vinyl methoxy silane To be obtained. The molar ratio of the siloxane unit represented by the formula R ₃ SiO _0.5 to the siloxane unit represented by the formula SiO ₂ is 0.5 to
1.0, a copolymer having at least one hydroxyl group or hydrolyzable group bonded to a silicon atom in one molecule, and desirably having an average molecular weight of 2,000 to 3,000.

The organosilicone resin of the present invention comprises (a) component and (b)
It is a product obtained by partially condensing components. The ratio of the component (a) and the component (b) constituting the organic silicone resin is as follows:
80:20 to 20:80 are preferred. This partial condensation reaction is carried out without a catalyst or under a basic catalyst. Examples of the basic catalyst include sodium hydroxide, metal hydroxides such as lithium hydroxide, trimethylamine, aliphatic amines such as diethylamine, and the like. Examples include aromatic amines such as aniline and methylaniline, and quaternary ammonium compounds such as organoammonium hydroxide.

The amount of the organic silicone resin of the present invention is 0.1 to 50% by weight based on the total amount of the skin cosmetic. If it is less than 0.1% by weight, a sufficient effect cannot be obtained, and if it exceeds 50% by weight, it is difficult to dissolve in a low boiling point solvent.

The skin cosmetic of the present invention usually contains the following solvent, and a low-boiling solvent that volatilizes at room temperature is used. As the low-boiling solvent, a low-boiling chain silicone, a cyclic silicone, a low-boiling isoparaffinic hydrocarbon, a fluorochloro-substituted hydrocarbon, or the like is preferable.

The low boiling chain silicone is represented by the following general formula, and specifically includes hexamethyldisiloxane, octamethyltrisiloxane, decamethyltetrasiloxane, dodecamethylpentasiloxane and the like.

(In the formula, p represents an integer of 0 to 5.) The cyclic silicone is represented by the following general formula, specifically, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, and the like. .

(In the formula, q represents an integer of 3 to 7.) Examples of the low-boiling point isoparaffinic hydrocarbon include an isoparaffinic hydrocarbon having 1 to 30 carbon atoms having a boiling point in a range of 50 to 300 ° C at ordinary temperature. it can.

Examples of the fluorochloro-substituted hydrocarbon include trichlorotrifluoroethane and tetrachlorodifluoroethane.

Any one or more of the above low-boiling solvents can be used, and the total amount is 99% by weight of the total amount of skin cosmetics.
Or less, preferably 10 to 90% by weight.

In addition to the above components, lower alcohols such as ethanol and IPA may be added. Further, as a component that can be added to the present invention, there is a silicone derivative, for example, a chain dimethyl silicone oil, a methylphenyl silicone oil, a polyether-modified silicone oil, an amino-modified silicone oil, an epoxy-modified silicone oil, a fluorine-modified silicone oil, and the like. One or more components can be added.

This silicone derivative is effective for improving an organic silicone resin film. It is well known to add a low molecular weight plasticizer to the modification of the resin film, but phthalic acid derivatives and higher alcohol polyoxyethylene ether, which are conventional plasticizers, are unsuitable from the viewpoint of compatibility. In that respect, silicone derivatives have good compatibility with organic silicone resin, effectively plasticize the resin film, enhance adhesion to the skin, lose smoothness, and give a non-sticky, barbery film. .

The compounding amount of these silicone derivatives is 99% by weight or less based on the total amount of the skin cosmetic. If it exceeds 99% by weight, the organic silicone resin does not form a film, which is not preferable.

The skin cosmetic preparation of the present invention is optional, and includes three types: a solubilizing system, an emulsifying system, a powder dispersion system, a two-layer oil-water system, and an oil-water-powder.
Any of a layer system and the like may be used.

In the case of the emulsification system, it is common that the oil phase containing the organic silicone resin is emulsified with a nonionic surfactant, a cationic surfactant, an anionic surfactant or a mixture thereof. A method is preferred in which a mixture of a surfactant and a water-soluble polyhydric alcohol is prepared and then mixed with an oil phase to obtain an emulsified composition.

The water-soluble polyhydric alcohol is a polyhydric alcohol having two or more hydroxyl groups in a molecule, and specifically, ethylene glycol, propylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, dipropylene glycol, Glycerin, polyglycerin (diglycerin, triglycerin, tetraglycerin, decaglycerin, etc.), glucose, maltitol, sucrose, fructose xylitol, erythritol, starch-degraded sugar-reducing alcohol, and the like. The above is arbitrarily selected and used.

Examples of the oil constituting the oil phase of the emulsified cosmetic include the following oils in addition to the organic silicone resin according to the present invention.

That is, olive oil, coconut oil, safflower oil, castor oil, fats and oils such as cottonseed oil, lanolin, jojoba oil, wax oils such as carnauba wax, liquid paraffin, squalane, petrolatum, hydrocarbon oils such as volatile isoparaffin, fatty acids, Oils commonly used in cosmetics, such as alcohols, ester oils such as cetyl octanoate and isopropyl myristate, silicone oils such as dimethylpolysiloxane and methylphenylpolysiloxane, and silicone resins.

The general amount of the above components is such that the surfactant is 0.5 to 10% by weight of the total amount of the skin cosmetic and the oil phase containing the organic silicone resin is 20 to 80% by weight. In the case of preparing a mixture with a polyhydric alcohol and mixing it with an oil phase to obtain an emulsified composition, the surfactant is 1 to 20% by weight, the oil phase containing an organic silicone resin is 10 to 70% by weight, It is preferable that the content of the polyhydric alcohol is 5 to 30% by weight based on the total amount of the cosmetic and 50 to 90% by weight based on the surfactant.

In addition, the emulsified form of the emulsified cosmetic may be any of a water-in-oil type or an oil-in-water type, but it is preferable to prepare the emulsion so as not to lose the water repellency which is an effect of the present invention.

In addition to the above-mentioned essential components, the skin cosmetic of the present invention may further contain an ultraviolet absorber, an antioxidant, an antiseptic, a vitamin, and a hormone in a quantitative and qualitative range that does not impair the effects of the present invention depending on the purpose. You may mix | blend a chemical | medical agent, a fragrance | flavor, etc.

〔Example〕

Hereinafter, the present invention will be described in more detail by examples,
The present invention is not limited by this. All amounts in the examples are% by weight.

Reference Example A 50% toluene solution of the components (a) and (b) shown in Table 1 was mixed with a weight ratio of the components (a) and (b) ((a) /
After blending in (b)), 0.002 parts of sodium hydroxide was added as a condensation catalyst to 100 parts of component (a), and a condensation reaction was carried out while heating and stirring under reflux of toluene to obtain organic silicone resins V to IV. .

On the other hand, the following were prepared as comparative polysiloxanes.

P1 = R and X in formula (a); methyl group; n = 7000 P2 = R in formula (a); methyl group, X; hydroxyl group, n = 5000 P3 = P2 and (CH ₃ ) ₃ SiO _0.5 / SiO ₂ = 0.7, 30 with degree of polymerization 2500
/ 70 mixture The skin cosmetics of Examples 1 to 4 and Comparative Examples 1 to 3 were prepared as follows.

Example 1 Hand lotion (1) Decamethylcyclopentasiloxane 80.0% (2) Organosilicone resin (I) 10.0% (3) Ethanol 10.0% (4) Perfume appropriate amount (1) to (4) at 50 ° C. The mixture was stirred and dissolved, and cooled to obtain a lotion.

Example 2 Hand lotion (1) Dimethyl polysiloxane (5cst) 65.0% (2) Glyceryl triisostearate 5.0% (3) Organic silicone resin (II) 5.0% (4) Jojoba oil 25.0% (1) to (4) ) Was stirred and dissolved at 50-60 ° C and cooled to obtain a lotion.

Example 3 Hand cream (1) Liquid paraffin 20.0% (2) Solid paraffin 5.0% (3) Microcrystalline wax 4.0% (4) Organic silicone resin (II) 20,0% (5) Light liquid isoparaffin 45.0% (6) ) Isopropyl palmitate 6.0% (1) to (6) were stirred and dissolved at 80 ° C, and cooled to obtain a cream.

Example 4 Moisture Lotion (1) Squalane 10.0% (2) Isopropyl myristate 20.0% (3) Organic silicone resin (IV) 5.0% (4) Octamethylcyclotetrasiloxane 35.0% (5) Isobitane monooleate 5.0% (6) 1,3-butylene glycol 3.0% (7) Preservative appropriate amount (8) Purified water residue (1) to (5) are stirred and dissolved at 70 ° C.
The solution obtained by dissolving (7) in (8) was added to obtain a moisture lotion.

Comparative Example 1 Hand lotion (1) Decamethylcyclopentasiloxane 80.0% (2) Polysiloxane; P1 10.0% (3) Ethanol 10.0% (4) Appropriate amount of flavor (1) to (4) are stirred and dissolved at 50 ° C. Then, the mixture was cooled to obtain a lotion.

Comparative Example 2 Hand cream (1) Liquid paraffin 20.0% (2) Solid paraffin 5.0% (3) Microcrystalline wax 4.0% (4) Polysiloxane; P2 20.0% (5) Light liquid isoparaffin 45.0% (6) Isopropyl palmitate 6.0% (1) to (6) were stirred and dissolved at 80 ° C., and cooled to obtain a cream.

Comparative Example 3 Hand lotion A hand lotion was obtained in the same manner as in Example 1, except that P3 was used instead of the organic silicone resin I.

The following experiments were performed on the skin cosmetics of Examples 1 to 4 and Comparative Examples 1 to 3 to evaluate the performance.

Ten panelists were selected, and 1 g of each of the cosmetics of Examples 1 to 4 and Comparative Examples 1 to 3 was taken and applied to the back of the hand, and the water repellency and smoothness were organoleptically evaluated. Thereafter, the hands were put on water at 40 ° C. for 30 minutes, and after sufficiently dried with hot air, the water repellency and smoothness were again subjected to a sensory evaluation.

Water repellency: 2 to 3 drops of water with a dropper Smoothness: Evaluation by touching the uncoated hand The evaluation was performed in the following three stages, and the average value of 10 people (O is 1 point,
The results are shown in Table 2 below.

○… Excellent △… Normal ×… Poor [Effects of the Invention] The skin cosmetic of the present invention, which contains a specific organic silicone resin, has flexibility and a smooth feel, has excellent water resistance, and protects the skin that does not easily flow with water. It became possible to form a film.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A61K 7/00 J A61K 7/48 A61K 7/00 W

Claims (3)

(57) [Claims] (A) substantially the general formula (Where R is a substituted or unsubstituted monovalent or different monovalent hydrocarbon group, X is a hydroxyl group or a hydrolyzable group, and n is 10 to
And (b) a siloxane unit represented by the formula R ₃ SiO _0.5 and a formula SiO _2.
A copolymer comprising siloxane units represented by
R is a substituted or unsubstituted monovalent or different monovalent hydrocarbon group) and one or more polyorganosiloxanes having at least one hydroxyl group or hydrolyzable group bonded to a silicon atom in one molecule. A skin cosmetic comprising an organic silicone resin obtained by condensation. 2. The skin cosmetic according to claim 1, wherein the cosmetic contains a low-boiling solvent. 3. The low-boiling solvent is a low-boiling silicone having 1 carbon atom.
The skin cosmetic according to claim 2, which is at least one solvent selected from a low boiling point isoparaffinic hydrocarbon and a fluorochloro-substituted hydrocarbon.