JP2007308399A - Gel-like cosmetic - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a gel-like cosmetic that is prepared by gelling a humectant substantially not containing water with a water-soluble thickener and does not contain water. <P>SOLUTION: The gel-like cosmetic is obtained by gelling a humectant substantially not containing water with a water-soluble thickener. The gel-like cosmetic is especially preferably used as a massage gel, moisture gel, cleansing gel, shaving gel, etc., for giving a good warm feel. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a gel cosmetic. More specifically, the present invention relates to a gel cosmetic characterized by gelling a moisturizer with a water-soluble thickener.

  An aqueous gel obtained by gelling an aqueous composition containing a moisturizer with a water-soluble thickener is known as a cosmetic that imparts a moisturizing effect (Non-patent Document 1). Water-soluble thickeners are thickeners used to thicken the system by dissolving or swelling in water. Mainly gels using water-soluble polymers such as polysaccharides and carboxyvinyl polymers. Cosmetics are manufactured (Patent Document 1, Patent Document 2).

  However, a conventional thickener comprising a water-soluble polymer can gel a system containing water, but has a poor ability to gel a system not containing water. In the first place, in gel cosmetics containing water-soluble moisturizers such as moisture gel, it is common knowledge of those skilled in the art to contain a certain amount of water, and further, a composition that does not contain water due to the water-soluble polymer. There is no need to thicken the gel to gel, and no such attempt is made.

  On the other hand, as a water-soluble thickener, a thickener composed of a water-soluble polymer microgel has been developed and used as a thickener for cosmetics containing water (Patent Documents 3 to 5).

JP 2005-325106 A JP 2005-225769 A JP 2004-157130 A JP-A-2005-132782 JP-A-2005-145860 New Cosmetic Science Nanzan-do 357-359 pages

  As a result of intensive research on cosmetics containing a thickener composed of the above water-soluble polymer microgel, the present inventors surprisingly found that when the thickener is mixed in a moisturizer, Even if it does not exist, the moisturizing agent gels, and it has been found that the thickening action by the water-soluble polymer is remarkably exhibited in the moisturizing agent without water, and the present invention has been completed.

  An object of the present invention is to provide a novel gel-like cosmetic that cannot be produced by a conventional idea, characterized in that a humectant substantially free of water is gelled with a water-soluble thickener. .

  That is, the present invention provides a gel cosmetic characterized by gelling a humectant substantially free of water with a water-soluble thickener.

  Further, the present invention is characterized in that the water-soluble thickener is a thickener comprising a microgel obtained by dissolving a water-soluble ethylenically unsaturated monomer in a dispersed phase and radical polymerization in the dispersed phase. The above-mentioned gel cosmetic is provided.

  Furthermore, the present invention provides the gel cosmetic as described above, wherein the water-soluble ethylenically unsaturated monomer is dialkylacrylamide and ionic acrylamide.

  Although the gel-like cosmetic of the present invention does not contain water, a gel having a desired viscosity can be produced with a water-soluble thickener, and thus a stable gel-like cosmetic can be easily produced. And since it does not contain water substantially, it can utilize preferably as cosmetics which have the warm feeling effect by a moisturizer.

  The present invention is described in detail below.

  The humectant used in the present invention is not limited as long as it is gelled by a water-soluble polymer. Specific examples include polyethylene glycol, propylene glycol, glycerin, 1,3-butylene glycol, sorbitol, maltitol and the like. Polyhydric alcohols are preferred, with glycerin and / or 1,3-butylene glycol being particularly preferred. Two or more kinds of humectants may be gelled.

  The humectant used in the present invention does not substantially contain water (it may contain water that does not affect gelation or cannot be purified as an impurity), and the gel cosmetic of the present invention Is substantially free of water. The amount of the humectant is about 5 to 99% by mass based on the total amount of the gel cosmetic, and is appropriately determined depending on the desired gel viscosity.

The water-soluble thickener used in the present invention is not limited as long as it can gel the humectant,
A thickener composed of a microgel obtained by dissolving a water-soluble ethylenically unsaturated monomer in a dispersed phase and radical polymerization in the dispersed phase is particularly preferred from the viewpoint of gelation effect.
A thickener made of microgel is obtained by radical polymerization in a dispersed phase after dissolving a water-soluble ethylenically unsaturated monomer in a dispersed phase in a composition having an organic solvent or oil as a dispersion medium and water as a dispersed phase. It is a thickener composed of a synthetic polymer microgel, and is a thickener described in Patent Document 3 (Japanese Patent Application Laid-Open No. 2004-43785).

  That is, a polymer microgel produced by a polymerization method generally referred to as a reverse emulsion polymerization method is used for the use of a thickener, and uniform polymerization as disclosed in JP-A-2001-114641. The polymerization method and mechanical properties are different from those of a thickener made of a synthetic polymer obtained by the system. A microgel is fine particles of a synthetic polymer electrolyte produced by a reverse phase microemulsion polymerization method or the like. This microgel swells in water, ethanol, or a water-ethanol mixed solution, and can provide a high-viscosity solution that is visually uniform in appearance. On the other hand, the synthetic polymer based on the homogeneous polymerization system disclosed in Japanese Patent Application Laid-Open No. 2001-114641 is not a microgel, and must be pulverized into a powder state in order to blend the synthetic polymer into cosmetics. I must. In addition, a synthetic polymer gel is noticeable and may cause problems in appearance. The microgel used in the present invention is polymerized in a heterogeneous polymerization system. The resulting synthetic polymer becomes a fine polymer gel, that is, a microgel, and when blended into cosmetics, it does not need to be pulverized and powdered, exhibits an excellent thickening effect and excellent usability. Furthermore, the appearance of the cosmetic is also preferable.

The thickener comprising a microgel used in the present invention is preferably produced by a reverse phase emulsion polymerization method. That is, in a composition having an organic solvent or an oil as a dispersion medium and water as a dispersed phase, it is produced by dissolving a water-soluble ethylenically unsaturated monomer in the dispersed phase and radical polymerization in the dispersed phase. The polymerized microgel is washed and dried, but need not be crushed.
In particular, by using a surfactant adjusted to an appropriately selected hydrophilic / hydrophobic balance (HLB), the microgel under the condition that the polymerization system in the inverse emulsion polymerization forms a one-phase microemulsion or a fine W / O emulsion. It is preferred that a thickener consisting of

  A single-phase microemulsion is a state in which the oil phase and the water phase coexist thermodynamically and the interfacial tension between the oil and water is minimized. The fine W / O emulsion is thermodynamically unstable, but oil and water are present as fine W / O emulsions stably in kinetics. Generally, the particle diameter of the inner aqueous phase of the fine W / O emulsion is about several tens to 100 nm. These states are determined only by the composition and temperature of the system and do not depend on mechanical stirring conditions.

The composition constituting the polymerization system is composed of an organic solvent or oil that does not mix with water (dispersing medium constituting the outer phase) and a dispersed phase consisting of water (constituting the inner phase).
Preferable organic solvents include alkanes such as pentane, hexane, heptane, octane, nonane, decane, undecane; cycloalkanes such as cyclopentane, cyclohexane, cycloheptane, cyclooctane; benzene, toluene, xylene, decalin, naphthalene, etc. And aromatic and cyclic hydrocarbons.
Preferred oils include nonpolar oils such as paraffin oil.
The water-soluble ethylenically unsaturated monomer is dissolved in water as a dispersed phase, then mixed with an organic solvent or oil as a dispersion medium, heated to a desired temperature, and then a polymerization initiator is added to the aqueous phase for polymerization. .

  In general, in the heterogeneous polymerization method, it is known that the properties of the polymer produced vary depending on the stirring conditions during the polymerization. The reason is that since the emulsification system is not thermodynamically stable, the shape and size of the emulsified particles change depending on the stirring conditions. In the present invention, it has been found that these problems can be avoided by performing polymerization in a thermodynamically stable one-phase microemulsion region or a fine W / O emulsion region that exists in the vicinity of a metastable one-phase region. It was. Specifically, the composition of the polymerization system (type of organic solvent, so that the above-mentioned one-phase microemulsion or fine W / O emulsion region appears in the vicinity of the optimum polymerization temperature of the polymerization initiator for normal thermal polymerization or redox polymerization. By adjusting the surfactant (HLB), it became possible to obtain a microgel with a high thickening effect by polymerizing the polymer in a fine aqueous phase (water droplets).

A phase diagram example is shown in FIG. FIG. 1 is a three-component phase diagram of hexane (indicated by W) / surfactant / water-soluble ethylene monomer aqueous solution (indicated by O) when hexane is used as an organic solvent. The region A shown in the figure is a one-phase microemulsion region to a fine W / O emulsion region, and by performing polymerization in this region, preferable microgel polymerization is possible.
In contrast, conventional polymer thickeners based on suspension polymerization (for example, the method described in JP-A-2001-114641) are difficult to control the particle diameter of water droplets during polymerization, and thus a high-quality microgel is obtained. It is difficult.

（Ｒ₆はＨまたはメチル基、Ｒ₇及びＲ₈はそれぞれ独立にメチル基、エチル基、プロピル基、イソプロピル基を表わす。） The water-soluble ethylenically unsaturated monomer is preferably a combination of a nonionic monomer and an ionic monomer (anionic monomer or cationic monomer).
The nonionic monomer is preferably a dialkylacrylamide represented by the general formula (1).
General formula (1)

(R ₆ represents H or a methyl group, and R ₇ and R ₈ each independently represents a methyl group, an ethyl group, a propyl group, or an isopropyl group.)

（Ｒ₉及びＲ₁₀はそれぞれ独立にＨ又はメチル基、Ｒ₁₁は炭素原子数１〜６の直鎖若しくは分岐のアルキル基、Ｘは金属イオン若しくはＮＨ₃を表わす。）

一般式（３）

（Ｒ₁₂はＨ又はメチル基、Ｒ₁₃はＨまたは炭素原子数１〜６の直鎖若しくは分岐のアルキル基、Ｒ₁₄は炭素原子数１〜６の直鎖若しくは分岐のアルキル基、Ｒ₁₅、Ｒ₁₆、Ｒ₁₇はメチル基またはエチル基、Ｙは金属イオンを表わす。） The ionic monomer is preferably an anionic acrylamide derivative represented by the general formula (2) or a cationic acrylamide derivative represented by the general formula (3).
General formula (2)

(R ₉ and R ₁₀ are each independently H or a methyl group, R ₁₁ is a linear or branched alkyl group having 1 to 6 carbon atoms, and X is a metal ion or NH _3. )

General formula (3)

(R ₁₂ is H or a methyl group, R ₁₃ is H or a linear or branched alkyl group having 1 to 6 carbon atoms, R ₁₄ is a linear or branched alkyl group having 1 to 6 carbon atoms, R ₁₅ , R ₁₆ and R ₁₇ represent a methyl group or an ethyl group, and Y represents a metal ion.)

Particularly preferred dialkylacrylamides are dimethylacrylamide and diethylacrylamide.
Particularly preferred ionic acrylamide derivatives are 2-acrylamide 2-methylpropanesulfonic acid and its salts.
A particularly preferred cationic acrylamide derivative is N, N, -dimethylaminopropylacrylamide methyl chloride.

  The monomer composition ratio in the polymerization system of the nonionic monomer and the ionic monomer (the charge ratio of the polymerization system) is arbitrarily determined arbitrarily according to the monomer composition ratio of the target microgel. The monomer composition ratio of the microgel and the charging ratio to the polymerization system are almost the same. The charging ratio (molar ratio) of the polymerization system of the nonionic monomer and the ionic monomer is usually nonionic monomer: ionic monomer = 0.5: 9.5 to 9.5: 0.5, preferably 1. : 9 to 9: 1, more preferably 7: 3 to 9: 1. The optimum ratio is nonionic monomer: ionic monomer = 8: 2.

  The above-mentioned water-soluble ethylenically unsaturated monomer is arbitrarily selected, and the thickener of component (A) used in the present invention is polymerized. A preferred thickener is a microgel of a binary copolymer using dimethylacrylamide and 2-acrylamido-2-methylpropanesulfonic acid as water-soluble ethylenically unsaturated monomers and copolymerized from these monomers. In this case, there is no need for a crosslinking monomer, and a thickener that exhibits an excellent thickening effect and a feeling of use due to self-crosslinking can be obtained. In addition, a crosslinking monomer can also be used, and in that case, the crosslinking monomer represented by the general formula (4) is preferable. In particular, methylenebisacrylamide is preferable, and a microgel of a copolymer composed of dimethylacrylamide, 2-acrylamido-2-methylpropanesulfonic acid and methylenebisacrylamide is also preferably used in the present invention.

  In order to dissolve the water-soluble ethylenically unsaturated monomer in the dispersed phase and polymerize the preferred microgel for the present invention, it is necessary to select the optimum outer phase oil or organic solvent and surfactant. . That is, as described in Patent Document 1, by creating a phase diagram of the hydrophilic-hydrophobic balance (HLB) of the nonionic surfactant in the composition of the polymerization system, the cloud point at a temperature suitable for thermal radical polymerization By preparing so as to show a state that forms a one-phase microemulsion or a fine W / O emulsion at a normal thermal radical polymerization temperature, a microgel having a rheological property preferable as a thickener can be obtained.

Preferred surfactants are polyoxyethylene cetyl ether, polyoxyethylene oleyl ether, polyoxyethylene stearyl ether, polyoxyethylene nonylphenyl ether, polyoxyethylene lauryl ether, polyoxyethylene hexyl decyl ether, polyoxyethylene isostearyl ether , Polyoxyethylene octyldodecyl ether, polyoxyethylene behenyl ether, polyoxyethylene cholesteryl ether, polyoxyethylene hydrogenated castor oil, sorbitan fatty acid ester, mono fatty acid glycerin, tri fatty acid glycerin, polyglycerin fatty acid ester, isostearic acid polyoxyethylene glycerin, Polyoxyethylene glycerin triisostearate, polyoxymonostearate Ji Ren glycerin distearate, polyoxyethylene glyceryl, and the like tristearate polyoxyethylene glyceryl.
These surfactants can be appropriately combined to adjust to a desired HLB and added to the polymerization system.

  As described above, in the microgel obtained by copolymerizing dialkylacrylamide and acrylamide-based ionic monomer, the spontaneous crosslinking reaction proceeds. In particular, even if the polyfunctional crosslinking monomer is not copolymerized as the third component, A self-crosslinked microgel is obtained and is a preferred thickener. The third component polyfunctional cross-linking monomer is not necessary, but the microgel preferably used in the present invention can be synthesized even if it is added and copolymerized.

The multifunctional crosslinking monomer is preferably a monomer represented by the general formula (4), and can be crosslinked using one or more kinds of crosslinking monomers represented by the general formula (4). It is essential that these crosslinkable monomers can take a crosslinked structure efficiently in a polymerization system of dialkylacrylamide and an ionic acrylamide derivative.















General formula (4)

  Preferred crosslinkable monomers include, for example, ethylene glycol diacrylate, ethylene glycol dimethacrylate, polyoxyethylene diacrylate, polyoxyethylene dimethacrylate, diethylene glycol dimethacrylate, trimethylolpropane triacrylate, N, N′-methylenebisacrylamide, N, N′-ethylenebisacrylamide, triallyl isocyanurate, pentaerythritol dimethacrylate, and the like can be used, and one or more selected from these can be used. In the present invention, N, N′-methylenebisacrylamide is particularly preferably used.

  The molar ratio of the content of 2-acrylamido-2-methylpropanesulfonic acid unit and dialkylacrylamide unit in the copolymer is usually 2-acrylamido-2-methylpropanesulfonic acid unit: dialkylacrylamide unit = 0.5: 9.5 to 9.5: 0.5, preferably 1: 9 to 9: 1, and more preferably = 3: 7 to 1: 9. The optimum ratio is 2-acrylamido-2-methylpropanesulfonic acid unit: dialkylacrylamide unit = 2: 8.

  The viscosity of the thickener is caused by the extension of the molecular chain by electrostatic repulsion based on the sulfonyl group, which is a strong dissociation group, and by the spontaneous crosslinking reaction of dialkylacrylamide or the crosslinking structure by a crosslinking monomer. If the content of the -2-methylpropanesulfonic acid unit or a salt thereof is less than 5 mol% with respect to the dialkylacrylamide unit, molecular chain extension does not occur sufficiently, so that sufficient viscosity may not be obtained.

  The use amount of the crosslinkable monomer is preferably in the range of 0.0001 to 2.0 mol% with respect to the total number of moles of 2-acrylamido-2-methylpropanesulfonic acid or a salt thereof and dialkylacrylamide. Thickeners prepared at less than 0.0001 mol% may not have a crosslinking effect. Moreover, when it exceeds 2 mol%, since a crosslinking density is too high and a microgel cannot fully swell, it may not exhibit sufficient thickening effect.

  The molecular weight of the thickener that is a microgel used in the present invention is about a weight average molecular weight of 100,000 to 5,000,000 (PEG conversion: measured by GPC), and is adjusted by the viscosity required as the thickener.

The microgel obtained by the above polymerization method has all the rheological properties of the following (1) to (3). The thickener composed of the microgel is obtained by the production method by the polymerization method described above, and is preferably used as a thickener.
(1) The apparent viscosity of an aqueous dispersion of 0.5% (mass percentage) of the microgel is 10,000 mPa · s or more at a shear rate of 1.0 s ⁻¹ .
(2) The apparent viscosity of the 0.5% (percentage by mass) ethanol dispersion of the microgel is 5000 mPa · s or more at a shear rate of 1.0 s ⁻¹ .
(3) The dynamic elastic modulus of the microgel in a 0.5% (mass percentage) aqueous dispersion or ethanol dispersion is G ′> G ″ within a strain of 1% or less and a frequency of 0.01 to 10 Hz.
The apparent viscosity of microgel water or ethanol dispersion is a viscosity at a measurement temperature of 25 ° C. and a shear rate of 1 s ⁻¹ using a cone plate rheometer (MCR-300 manufactured by Paar Rhysica).
The dynamic elastic modulus is the value of the storage elastic modulus (G ′) and loss elastic modulus (G ″) measured at a measurement temperature of 25 ° C. with a strain of 1% or less and a frequency range of 0.1 to 10 Hz using the same measuring apparatus. Means.

  The microgel used as a thickener in the present invention can be separated in a powder state through a simple precipitation purification step after polymerization. The microgel separated into a powder form is easily dispersed in a humectant and rapidly swells to function as a gelling thickener.

  In the present invention, oil and ethanol can be blended in addition to the above essential components. The blending amount of oil and ethanol is the remainder of the essential components, but is preferably 1 to 50% by mass with respect to the total amount of the gel cosmetic.

  The gel cosmetic of the present invention can be gelled by mixing a water-soluble thickener with the moisturizing agent, and can optionally maintain any compounding ingredients other than water that are usually blended in cosmetics in a gel form depending on the purpose. It can be manufactured by a conventional method by mixing within the range.

  In the present invention, the moisturizing agent as a main component is thickened in a gel shape, so that it is preferable as a warm skin cosmetic. Specific products include a massage gel, a moisture gel, a cleansing gel, and a shaving gel. It is particularly preferred to be used as a product such as

  EXAMPLES Next, an Example is given and this invention is demonstrated in more detail. The present invention is not limited by these examples. In addition, about a compounding quantity, unless otherwise indicated, the mass% is shown.

"Manufacture of thickener made of microgel"
Synthesis example 1
40 g of dimethylacrylamide (manufactured by Kojin) and 9 g of 2-acrylamido-2-methylpropanesulfonic acid (manufactured by Sigma) are dissolved in 250 g of ion-exchanged water and adjusted to pH = 7.0 with sodium hydroxide. To a 1000 ml three-necked flask equipped with a reflux apparatus, 250 g of n-hexane, 8.2 g of polyoxyethylene (3) oleyl ether (Emalex 503, manufactured by Nippon Emulsion) and polyoxyethylene (6) oleyl ether (Emalex 506, 16.4g (made in Japan Emulsion) is mixed and dissolved to replace N ₂ . An aqueous monomer solution is added to the three-necked flask and heated to 65 ° C. to 70 ° C. in an oil bath while stirring in an N ₂ atmosphere. After confirming that the system is in a translucent microemulsion state when the temperature of the system reaches 65 ° C. to 70 ° C., 2 g of ammonium persulfate is added to the polymerization system to start the polymerization. A microgel is produced by maintaining the polymerization system at 65-70 ° C. with stirring for 3 hours. After the polymerization is completed, acetone is added to the microgel suspension to precipitate the microgel, followed by washing with acetone three times to remove residual monomer and surfactant. The precipitate is filtered and dried under reduced pressure to obtain a dried white powdered microgel.

Synthesis example 2
35 g of dimethylacrylamide (manufactured by Kojin) and 17.5 g of 2-acrylamido-2-methylpropanesulfonic acid (manufactured by Sigma) are dissolved in 260 g of ion-exchanged water and adjusted to pH = 7.0 with sodium hydroxide. In a 1000 ml three-necked flask equipped with a reflux apparatus, 260 g of n-hexane, polyoxyethylene (3) oleyl ether (Emalex 503, manufactured by Nippon Emulsion) 8.7 g and polyoxyethylene (6) oleyl ether (Emalex 506, Japanese-made emulsion) 17.6g were mixed and dissolved into the N ₂ to replace. An aqueous monomer solution is added to the three-necked flask and heated to 65 ° C. to 70 ° C. in an oil bath while stirring in an N ₂ atmosphere. After confirming that the system is in a translucent microemulsion state when the temperature of the system reaches 65 ° C. to 70 ° C., 2 g of ammonium persulfate is added to the polymerization system to start the polymerization. A microgel is produced by maintaining the polymerization system at 65-70 ° C. with stirring for 3 hours. After the polymerization is completed, acetone is added to the microgel suspension to precipitate the microgel, followed by washing with acetone three times to remove residual monomer and surfactant. The precipitate is filtered and dried under reduced pressure to obtain a dried white powdered microgel.

Synthesis example 3
30 g of dimethylacrylamide (manufactured by Kojin) and 26.7 g of 2-acrylamido-2-methylpropanesulfonic acid (manufactured by Sigma) are dissolved in 280 g of ion-exchanged water and adjusted to pH = 7.0 with sodium hydroxide. To a 1000 ml three-necked flask equipped with a reflux apparatus, 280 g of n-hexane, 9.4 g of polyoxyethylene (3) oleyl ether (Emalex 503, manufactured by Nippon Emulsion) and polyoxyethylene (6) oleyl ether (Emalex 506, Japanese-made emulsion) 19g were mixed and dissolved into the N ₂ to replace. An aqueous monomer solution is added to the three-necked flask and heated to 65 ° C. to 70 ° C. in an oil bath while stirring in an N ₂ atmosphere. After confirming that the system is in a translucent microemulsion state when the temperature of the system reaches 65 ° C. to 70 ° C., 2 g of ammonium persulfate is added to the polymerization system to start the polymerization. A microgel is produced by maintaining the polymerization system at 65-70 ° C. with stirring for 3 hours. After the polymerization is completed, acetone is added to the microgel suspension to precipitate the microgel, followed by washing with acetone three times to remove residual monomer and surfactant. The precipitate is filtered and dried under reduced pressure to obtain a dried white powdered microgel.

Synthesis example 4
Dissolve 35 g of dimethylacrylamide (manufactured by Kojin), 17.5 g of 2-acrylamide-2-methylpropanesulfonic acid (manufactured by Sigma) and 7 mg of methylenebisacrylamide in 260 g of ion-exchanged water, and adjust the pH to 7.0 with sodium hydroxide. In a 1000 ml three-necked flask equipped with a reflux apparatus, 260 g of n-hexane, polyoxyethylene (3) oleyl ether (Emalex 503, manufactured by Nippon Emulsion) 8.7 g and polyoxyethylene (6) oleyl ether (Emalex 506, Japanese-made emulsion) 17.6g were mixed and dissolved into the N ₂ to replace. An aqueous monomer solution is added to the three-necked flask and heated to 65 ° C. to 70 ° C. in an oil bath while stirring in an N ₂ atmosphere. After confirming that the system is in a translucent microemulsion state when the temperature of the system reaches 65 ° C. to 70 ° C., 2 g of ammonium persulfate is added to the polymerization system to start the polymerization. A microgel is produced by maintaining the polymerization system at 65-70 ° C. with stirring for 3 hours. After the polymerization is completed, acetone is added to the microgel suspension to precipitate the microgel, followed by washing with acetone three times to remove residual monomer and surfactant. The precipitate is filtered and dried under reduced pressure to obtain a dried white powdered microgel.

Synthesis example 5
Dissolve 35 g of dimethylacrylamide (manufactured by Kojin), 17.5 g of 2-acrylamide-2-methylpropanesulfonic acid (manufactured by Sigma) and 70 mg of methylenebisacrylamide in 260 g of ion-exchanged water, and adjust the pH to 7.0 with sodium hydroxide. In a 1000 ml three-necked flask equipped with a reflux apparatus, 260 g of n-hexane, polyoxyethylene (3) oleyl ether (Emalex 503, manufactured by Nippon Emulsion) 8.7 g and polyoxyethylene (6) oleyl ether (Emalex 506, Japanese-made emulsion) 17.6g were mixed and dissolved into the N ₂ to replace. An aqueous monomer solution is added to the three-necked flask and heated to 65 ° C. to 70 ° C. in an oil bath while stirring in an N ₂ atmosphere. After confirming that the system is in a translucent microemulsion state when the temperature of the system reaches 65 ° C. to 70 ° C., 2 g of ammonium persulfate is added to the polymerization system to start the polymerization. A microgel is produced by maintaining the polymerization system at 65-70 ° C. with stirring for 3 hours. After the polymerization is completed, acetone is added to the microgel suspension to precipitate the microgel, followed by washing with acetone three times to remove residual monomer and surfactant. The precipitate is filtered and dried under reduced pressure to obtain a dried white powdered microgel.

Synthesis Example 6
Dissolve 35 g of dimethylacrylamide (manufactured by Kojin) and 17.5 g of N, N-dimethylaminopropylacrylamide methyl chloride (manufactured by Kojin) in 260 g of ion-exchanged water. In a 1000 ml three-necked flask equipped with a reflux apparatus, 260 g of n-hexane, polyoxyethylene (3) oleyl ether (Emalex 503, manufactured by Nippon Emulsion) 8.7 g and polyoxyethylene (6) oleyl ether (Emalex 506, Japanese-made emulsion) 17.6g were mixed and dissolved into the N ₂ to replace. An aqueous monomer solution is added to the three-necked flask and heated to 65 ° C. to 70 ° C. in an oil bath while stirring in an N ₂ atmosphere. After confirming that the system is in a translucent microemulsion state when the temperature of the system reaches 65 ° C. to 70 ° C., 2 g of ammonium persulfate is added to the polymerization system to start the polymerization. A microgel is produced by maintaining the polymerization system at 65-70 ° C. with stirring for 3 hours. After the polymerization is completed, acetone is added to the microgel suspension to precipitate the microgel, followed by washing with acetone three times to remove residual monomer and surfactant. The precipitate is filtered and dried under reduced pressure to obtain a dried white powdered microgel.

Synthesis example 7
Dissolve 35 g of dimethylacrylamide (manufactured by Kojin), 17.5 g of N, N-dimethylaminopropylacrylamide methyl chloride (manufactured by Kojin) and 7 mg of methylenebisacrylamide in 260 g of ion-exchanged water. In a 1000 ml three-necked flask equipped with a reflux apparatus, 260 g of n-hexane, polyoxyethylene (3) oleyl ether (Emalex 503, manufactured by Nippon Emulsion) 8.7 g and polyoxyethylene (6) oleyl ether (Emalex 506, Japanese-made emulsion) 17.6g were mixed and dissolved into the N ₂ to replace. An aqueous monomer solution is added to the three-necked flask and heated to 65 ° C. to 70 ° C. in an oil bath while stirring in an N ₂ atmosphere. After confirming that the system is in a translucent microemulsion state when the temperature of the system reaches 65 ° C. to 70 ° C., 2 g of ammonium persulfate is added to the polymerization system to start the polymerization. A microgel is produced by maintaining the polymerization system at 65-70 ° C. with stirring for 3 hours. After the polymerization is completed, acetone is added to the microgel suspension to precipitate the microgel, followed by washing with acetone three times to remove residual monomer and surfactant. The precipitate is filtered and dried under reduced pressure to obtain a dried white powdered microgel.

The thickening effect of the humectant was examined using the water-soluble thickener composed of the microgel and other water-soluble thickeners. The results are shown in [Table 1]. From this result, in the Example of this invention, although a moisturizer gelatinizes and can manufacture the outstanding gel-like cosmetics, it turns out that it cannot gelatinize with the water-soluble thickener of a comparative example.

  Next, the warming effect of the moisturizer was examined using the water-soluble thickener composed of the microgel and other water-soluble thickeners. The results are shown in [Table 2]. From this result, in the examples of the present invention, it is possible to produce gel-like cosmetics that give an excellent warm feeling effect, but the water-soluble thickener of the comparative example cannot be gelled in the absence of water, and in the first place the warm feeling. It turns out that it does not give an effect.

  The following gel cosmetics of the present invention are listed. Both are excellent gel-like cosmetics having a warm feeling.

[Example 7: Warm gel]
Compounding ingredients Mass%
Glycerin 20.0
BG Residual polyethylene glycol 400 40.0
Microgel of Synthesis Example 1 0.2
Dimethicone 2.0
Perfume appropriate amount Mukuroji extract 1.0
Hamelis 1.0
Tounin extract 1.0
Manufacturing method A moisturizer is mixed and the microgel of the synthesis example 1 is dissolved. Then add fragrance and dimethicone, add plant extract and mix evenly.

[Example 8: Warm gel]
Compounding ingredients Mass%
Glycerin residual BG 30.0
DPG 30.0
PEG / PPG-14 / 7 dimethyl ether 20.0
Microgel of Synthesis Example 2 2.0
Perfume appropriate amount cetyl ethylhexanoate 0.5
Oat extract 1.0
Green tea extract 1.0
Manufacturing method A moisturizer is mixed and the microgel of the synthesis example 2 is dissolved. Then, a fragrance | flavor and cetyl ethylhexanoate are added, a plant extract is added, and it mixes uniformly.

[Example 9: moisturizer / alcohol gel]
Compounding ingredients Mass%
Glycerin 5.0
BG 10.0
DPG 10.0
Ethanol 20.0
PEG / PPG-14 / 7 dimethyl ether Microgel of residual synthesis example 3 1.0
Collagen extract 1.0
Elastin extract 1.0
Beech bud extract 1.0
Manufacturing method Alcohol and a humectant are mixed and the microgel of the synthesis example 3 is dissolved.

[Example 10: Warm shaving agent]
Compounding ingredients Mass%
Polyethylene glycol 4000 9.0
True spherical silicone cross-linked powder 5.0
1,2-pentanediol 20.0
Glycerin Residual Synthesis Example 4 Microgel 1.5
Polyether-modified silicone 4.0
Octamethylcyclotetrasiloxane 1.0
Methyl polysiloxane 1.0
Fragrance Appropriate amount production method The microgel of Synthesis Example 4 is dissolved in a humectant, and the mixture is stirred and mixed while adding the oil phase.

Example 11 Warm Makeup Cleansing Agent
Compounding ingredients Mass%
Polyethylene glycol 2000 5.0
Propylene glycol 20.0
Glycerin Residual Synthesis Example 5 Microgel 2.0
Maltitol 5.0
Silica 4.0
Polyether-modified silicone 3.5
Methylpolysiloxane 2.5
Decamethylcyclopentasiloxane 8.5
Fragrance Appropriate amount production method The microgel of Synthesis Example 5 is dissolved in a humectant, and the mixture is stirred and mixed while adding the oil phase.

[Example 12: Thermal massage gel]
Compounding ingredients Mass%
Polyethylene glycol 400 13.0
Polyethylene glycol 6000 4.0
Microgel of Synthesis Example 6 2.5
Polyether-modified silicone 2.0
Activated zeolite 8.0
1,3-butylene glycol xylene glycol to the balance 10.0
Decamethylcyclopentasiloxane 5.0
Production Method The microgel of Synthesis Example 6 is dissolved in a humectant, and the activated zeolite is dispersed therein, followed by stirring and mixing with a homomixer while adding the oil phase.

  The gel cosmetic of the present invention does not contain water, but a gel having a desired viscosity can be prepared with a water-soluble thickener, and a stable gel cosmetic can be easily provided. And since it does not contain water substantially, it can utilize preferably as a gel-like cosmetics which has the warm feeling effect which was excellent with the moisturizer of the main ingredient base.

It is an example of the phase diagram of hexane / surfactant / water-soluble ethylene monomer aqueous solution when polymerizing the microgel thickener used in the present invention.

Claims (3)

  A gel cosmetic characterized by gelling a humectant substantially free of water with a water-soluble thickener.   The water-soluble thickener is a thickener comprising a microgel obtained by dissolving a water-soluble ethylenically unsaturated monomer in a dispersed phase and radical polymerization in the dispersed phase. Gel cosmetic. The gel-like cosmetic according to claim 2, wherein the water-soluble ethylenically unsaturated monomer is dialkylacrylamide and ionic acrylamide.

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