JPH0586367B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cosmetic composition stably containing a silicon compound.

[Conventional technology]

Silicon is one of the important elements for living organisms, but silicon compounds with silanol groups are particularly
It has physiological activities such as collagen synthesis and cell activation, such as various inflammations, acute joint reactions, toothache, sinus pain, kidney stones, liver and gastrointestinal dysfunction,
It is effective against diabetes, hypertension, eye disorders, arterial and venous circulation disorders such as arteriosclerosis, and encephalomalacia. Furthermore, it has excellent effects on treating red spots and wrinkles, cell division disorders, and burns. However, silicon compounds with silanol groups are unstable and easily polymerize over time or under the influence of heat, resulting in high molecular weight polymers with poor effects, and remain stable as monomers or oligomers for long periods of time. It is difficult to store. Therefore, various techniques for stabilizing the silicon compounds have been developed. For example, in Japanese Patent Publication No. 36-21172, R
H _n Si(OR') _{4- -n} [However, in the formula, R is a monovalent hydrocarbon group with 7 or less carbon atoms, R' is a methyl group or an ethyl group,
is 1 or 2, m is 0 or 1, and +m is 2
Add water to the compound shown in
A method for obtaining a stable water-soluble organosilicon composition by hydrolysis at 8.75-105°C is disclosed. Japanese Patent Publication No. 46-21695 discloses that salicylic acid, mannuronic acid, citric acid, or phenol is added to an aqueous solution of alkali siliconate to form a complex, and then a cation exchange resin is added while stirring to achieve a pH of 1. A method for obtaining stable aqueous solutions of ~8 is disclosed. In addition, Japanese Patent Publication No. 1811/1989 discloses that after adding an alkaline aqueous solution of an organosilicon compound to an aqueous solution containing an alcohol or phenolic compound, the pH of the solution is adjusted to 13 or less using a cation exchange resin. Accordingly, a method for obtaining a stable aqueous solution is disclosed.

[Problem that the invention seeks to solve]

However, even with the above method, it has been difficult to store silanol group-containing silicon compounds stably for a long period of time. Therefore, the present invention
It is an object of the present invention to provide a stable silicon compound-containing cosmetic composition that suppresses polymerization of the silicon compound and can be stored for a long period of time in the form of a monomer or oligomer.

[Means for solving problems]

The present invention provides at least one silanol group in a specific silicon compound having at least one silanol group in the molecule.
This was based on the knowledge that the silicon compound can be kept stable for a long period of time by combining it with a certain type of surfactant.

That is, the present invention provides a cosmetic composition containing a water-soluble silicon compound monomer represented by the following general formula () or a water-soluble oligomer thereof and at least one surfactant dissolved in water. provide something.

R _o Si(OH) _4-o ...() (wherein, R is an alkyl group having 1 to 6 carbon atoms, an alkenyl group, an alkoxyl group, a cycloalkyl group,
A phenyl group, an alkyl phenyl group or aralkyl group in which the alkyl group has 1 to 6 carbon atoms, and n is 0
or an integer of 1 to 3, and when n is 2 or more, R may be the same or different. ) Compounds represented by the following and those in which a part of the hydrogen atoms of the hydroxyl group are substituted with an alkali metal, an alkaline earth metal, or an amine are preferable. Furthermore, compounds in which n is not 0 in the general formula () have a hydrocarbon in the molecule, and are therefore particularly preferred when applied to living organisms. Specifically, the silicon compounds used in the present invention include silanol, trimethylsilanol, dimethylsilanediol, methylethylsilanediol, methylsilanetriol, triethylsilanol, diethylsilanediol, ethylsilanetriol, di-n-propylsilanediol, Diisopropylsilanediol, di-n-
Examples include butylsilanediol, diisobutylsilanediol, di-tert-butylsilanediol, diallysilanediol, triphenylsilanol, diphenylsilanediol, phenylsilanetriol, methylcyclohexylsilanediol, dicyclohexylsilanediol, and the like. Examples of polysilanol compounds include tetramethyldisiloxane-1,3-diol, tetramethyldisylmethylene-1,3-diol, tetramethyldidylethylene-1,4-diol, and bis(methylvinyl)disiloxane. Examples include diol.

In the present invention, as the surfactant used in combination with the silicon compound, any substance that has a hydrophilic group and a hydrophobic group in the molecule and has the ability to lower interfacial tension can be used, and anionic surfactants can be used. One or a mixture of two or more of surfactants, nonionic surfactants, cationic surfactants and amphoteric surfactants are used. Specifically, fatty acid soaps having 10 to 24 carbon atoms, alkyl sulfate salts and polyoxyethylene alkyl sulfate salts in which the alkyl group has 9 to 18 carbon atoms, α-olefin sulfonates having 10 to 22 carbon atoms, inner olefin sulfonate,
POE
=1-50) alkyl (c8-20) or alkenyl (c8-20) ether, POE (=1-50) alkyl (c8-18) or alkenyl (c8-18) phenol ether, fatty acid (c8-22) alkanol Polyethylene glycol type nonionic surfactants such as amides, polyhydric alcohol type nonionic surfactants such as Span, Tween, and sucrose fatty acid esters, primary having an alkyl group with 10 to 24 carbon atoms in the molecule,
Cationic surfactants such as secondary or tertiary amine salts, quaternary ammonium salts or amine oxides, one type of amino acid type or betaine type amphoteric surfactant with an alkyl group or alkenyl group having 10 to 24 carbon atoms, or A mixture of two or more types is exemplified. Among these surfactants, from the viewpoint of biocompatibility, alkyl sulfate salts, POE alkyl sulfate salts,
α-olefin sulfonate, N-acylated amino acid salt, and quaternary ammonium salt are preferred. still,
Among the above compounds, POE is polyoxyethylene,
P represents the average number of added moles of ethylene oxide (the same applies hereinafter).

The content ratio of the silicon compound and the surfactant can be set arbitrarily, but the weight ratio is 50/1 to 1/
50, preferably 30/1 to 1/30. The composition of the present invention uses water as a medium and is in a form containing water, such as an aqueous solution, in which case the content of the silicon compound in the total amount of the composition is from 0.01 to
5% by weight (hereinafter abbreviated as %), preferably
It is preferable to set it at 0.1 to 3%. Further, the pH of the composition is preferably in the range of 3 to 7.

Various additives can be added to the composition of the present invention depending on its use. For example, various oils, preservatives, fragrances, pigments, etc., and especially when used as a hair cosmetic, emollient ingredients, etc. can be added.

〔Effect of the invention〕

According to the present invention, although the principle is unknown, the silicon compound monomer having a silanol group does not polymerize into a polymer and become insolubilized even after long-term storage, and remains in the monomer or oligomer state. be done. Therefore, the cosmetic composition of the present invention can maintain its excellent performance at the time of manufacture.

Next, the present invention will be explained with reference to Examples, but the present invention is not limited thereto.

〔Example〕

Example 1 The precipitate generated by hydrolyzing methyltrichlorosilane was collected, and an equimolar aqueous sodium hydroxide solution was added thereto and stirred to dissolve it, resulting in a silanoate [CH ₃ Si
(ONa) ₃ ] was obtained.

This was neutralized to pH = 6.5 with an H-type cation exchange resin, and after removing the ion exchange resin, C ₁₄ α-olefin sodium sulfonate (AOS-Na) and water were added, and the silicon compound (silanol equivalent) was added. ) 1%, AOS-Na1% PH=6.5 solution was obtained.
When this solution was subjected to an accelerated stability test at 45°C, it remained clear and stable for one month. Also, those prepared with a pH between 3 and 7 were similarly stable at 45°C for more than one month.

Example 2 A 50% aqueous solution of monomethyltriethoxysilane (PH = 7.0) was refluxed at 75 to 85°C for 25 minutes, and after hydrolysis, ethanol was removed using an evaporator, and sodium dodecyl sulfate (SDS) and Add water, 2% methyltrisilanol, SDS1
%, pH=7 was obtained. This solution was heated to 1
It remained transparent and stable for more than a week.

Example 3 The same operation as in Example 1 was carried out except that sodium N-lauroylglutamate was used instead of AOS-Na. Sodium N-lauroylglutamate 1%, methyltrisilanol 1%, PH=
A solution of 6.5 was obtained. This solution remained clear and stable for more than one month at 45°C.

Example 4 The same operation as in Example 2 was carried out except that a quaternary ammonium salt was used instead of SDS. Distearyldimethyl, ammonium chloride (Alucard 2HT) 0.1%, methyltrisilanol 2%
A solution with PH=4 was obtained.

This solution was stable for over a week at 45°C.

Example 5 The same operation as in Example 1 was carried out except that sucrose fatty acid ester was used instead of AOS-Na, and 1% of sucrose fatty acid ester (C ₁₂ ), 1% of methyltrisilanol, and PH = 7 were used. A solution was obtained. This solution is 45
It remained transparent and stable for more than one month at ℃.

Example 6 The same operation as in Example 2 was carried out using dimethyldiethoxysilane instead of monomethyltriethoxysilane, and dodecyl alcohol was used as the activator.
Using 10 moles of EO adduct, an aqueous solution containing 1% dimethyldisilanol, 5% dodecyl alcohol EO adduct, and pH=6.5 was finally obtained. This solution is 45
It remained transparent for more than a month at ℃.

Example 7 The same operation as in Example 6 was performed except that sodium dodecylbenzenesulfonate was used, and finally an aqueous solution containing 1% dimethylsilanediol, 3% sodium dodecylbenzenesulfonate, and pH=7 was obtained. This solution remained clear and stable for more than one month at 45°C.

Comparative Example 1 The operation of Example 1 was carried out without using AOS-Na to obtain an aqueous solution with a silanol concentration of 1% and a pH of 6.5.
When this solution was left at 25°C for one day, silanol polymers were formed and the liquid became white and cloudy. Also, after neutralizing with ion exchange resin, adjust the pH using a trace amount of mineral acid or alkali.
A similar phenomenon was observed when the solutions were left at 25°C for 1 day.

Comparative Example 2 The operation of Example 2 was carried out without using SDS to obtain an aqueous solution with a pH of 7 containing 2% methyltrisilanol. When this product was left at room temperature for several hours, a polymer was formed and the liquid became cloudy.

Example 8 Various compositions (A) to (E) containing the products of the present invention were prepared and their stability was examined, and they were found to be stable even after long-term storage. The preparation method and components of compositions (A) to (E) are shown below.

(A) Lotion for skin cosmetics Perform the same operation as in Example 3 to prepare an aqueous solution containing sodium N-lauroylglutamate and methyltrisilanol at a ratio of 1/1 (weight ratio). Created a lotion.

Methyltrisilanol/sodium N-lauroylglutamate 1% Propylene glycol 1 Methylparaben 0.1 Ethanol 5 Fragrance 0.2 Purified water Balance (B) Skin cosmetic cream Perform the same procedure as in Example 3 to prepare sodium N-lauroylglutamate and methyltrisilanol. An aqueous solution containing 1/1 (weight ratio) was prepared, and the following skin cosmetic cream was prepared by blending this solution.

Methyltrisilanol/sodium N-lauroylglutamate 1% Liquid paraffin 5 Squalane 5 Cetyl palmitate 2 Cetostearyl alcohol 3 Methylparaben 0.1 Fragrance 0.1 Glycerin 3 POE(40) Sorbitan monooleate 1 Purified water Balance (C) Hydrophilic ointment (for skin cosmetics) ) In the same manner as in Example 2, an aqueous solution of methyltrisilanol/sodium lauryl sulfate (silanol/sodium lauryl sulfate = 1/4 weight ratio) was prepared, and this was blended into a hydrophilic ointment. Ingredient content (%) Methyltrisilanol/sodium lauryl sulfate 2.0 White vaseline 25.0 Propylene glycol 12.0 Stearyl alcohol 22.0 Preservative 0.4 Purified water Balance (D) Shampoo composition Perform the same operation as in Example 3, An aqueous solution containing 15% ethanolamine salt and 1% methyltrisilanol was prepared, and a shampoo composition was prepared by blending this solution. Ingredient content (%) Methyltrisilanol/N-lauroylglutamic acid TEA salt 16 C ₁₂ amine oxide 2 Ethanol 3 Fragrance 0.3 Purified water Balance (E) Rinse composition Perform the same operation as in Example 4 to remove distearyl.
Dimethylammonium chloride (Alucard)
2HT) 3%, methyltrisilanol 1%, PH=
An aqueous solution of No. 4 was prepared to obtain the following rinse composition. Ingredient content (%) Methyltrisilanol Alucard 2HT 4 Ethanol 3 Stearyl ethoxylate (EO: 5 mol) 1 Fragrance 0.1 Purified water Balance.

Claims (1)

[Scope of Claims] 1. A cosmetic product characterized by containing a water-soluble silicon compound monomer represented by the following general formula () or its water-soluble oligomer and at least one surfactant dissolved in water. Composition. R _o Si(OH) _4-o ...() (wherein, R is an alkyl group having 1 to 6 carbon atoms, an alkenyl group, an alkoxyl group, a cycloalkyl group,
A phenyl group, an alkyl phenyl group or aralkyl group in which the alkyl group has 1 to 6 carbon atoms, and n is 0
or an integer of 1 to 3, and when n is 2 or more, R may be the same or different. 2. The composition according to claim 1, wherein the ratio of silicon compound to surfactant is in the range of 50/1 to 1/50 by weight. 3. The composition according to claim 1, wherein the content of the silicon compound is in the range of 0.01 to 5% by weight.