JP3291195B2 - Gel cosmetics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gel cosmetic, and more particularly, it has good spreadability when applied to the skin.
In addition, the present invention relates to a gel-like cosmetic free of shininess due to stickiness and sebum.

[0002]

2. Description of the Related Art Carboxyvinyl polymer, which is one of water-soluble polymers, is a useful component as a gelling agent for maintaining the structure of an aqueous base. By using this, a large amount of water can be retained in a system. A gel-like cosmetic having a fresh and refreshing feel can be obtained. Conventionally,
It has been proposed that by adding hydrophobic silicic anhydride or organic powder or inorganic powder to this, it is possible to obtain a gel-like cosmetic having no stickiness, good skin slipping feeling, and excellent feeling in use. JP-A-4-108714, JP-A-6-116131).

[0003] However, the conventional gel cosmetic using a carboxyvinyl polymer has a problem that when it is taken out of the container with a finger or when it is extruded from a tube container onto the skin, the spread on the skin is poor. . In addition, the use of the above-mentioned powder is still insufficient in terms of non-stickiness, and it is impossible to prevent shininess due to sebum.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a gel-like cosmetic composition which, when applied, instantaneously disintegrates the gel, spreads easily on the skin, has no sticky feeling, and prevents sebum shine. To provide.

[0005]

Under such circumstances, the present inventors have conducted intensive studies. As a result, if the hydrophobic oil-absorbing powder, the alkyl-modified carboxyvinyl polymer and the basic substance are used in combination, the skin The present invention was found to provide a gel-like cosmetic that spreads well and has no stickiness or shine due to sebum when applied to the skin, and has completed the present invention.

That is, the present invention relates to (a) a method for preparing a hydrophobic oil-absorbing powder having a squalane oil absorption of 2.0 g / g or more by 0.1 to
A gel-like skin cosmetic comprising: 10% by weight; (b) 0.01 to 2% by weight of an alkyl-modified carboxyvinyl polymer represented by the following general formula (1); and (c) a basic substance. Is provided.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The hydrophobic oil-absorbing powder used in the present invention has a squalane oil absorption of 2.0 g / g or more. The oil absorption of squalane is measured according to JIS K5101 (1
978) may be measured in accordance with the method for measuring the oil absorption of a pigment specified in (1). That is, 1 g of powder is taken on a glass plate,
The squalane is kneaded with a spatula while being dropped little by little, and the end point is when the powder becomes a paste as a whole, and the required amount of squalane (g) per gram of powder is defined as the oil absorption. In the JIS method, boiled linseed oil is used as oil,
This method uses squalane because of its similarity to sebum. In addition, the hydrophobic oil-absorbing powder should be hydrophobic because hydrophilic oil-absorbing powders such as porous silica and talc lose their oil-absorbing ability (sebum-absorbing ability) in the presence of water. is necessary.

[0008] The hydrophobic oil-absorbing powder used in the present invention comprises:
The polymer is preferably a polymer obtained by polymerizing one or more vinyl monomers having a solubility parameter of 7 to 10 and making the polymer porous. Examples of the vinyl monomer having a solubility parameter of 7 to 10 include, for example, an ester of methacrylic acid and a higher alcohol having 8 to 24 carbon atoms, an ester of acrylic acid and a higher alcohol having 8 to 24 carbon atoms, styrene or one to 1 carbon atoms. Styrene derivative having 12 straight or branched hydrocarbon substituents, having 8 carbon atoms
And vinyl esters of saturated carboxylic acids having up to 20 carbon atoms, acrylic acid, methacrylic acid, and diolefins having 4 to 6 carbon atoms. When the solubility parameter of the vinyl monomer is in the range of 7 to 10, compatibility with sebum is excellent, and sufficient sebum absorption ability can be obtained. These monomers are used alone or in combination of two or more.

The polymerization and the porosity formation of the vinyl monomer may be carried out according to the method described in JP-A-63-316715. The monomer is dissolved in a non-polymerizable organic solvent, and the solution is further dissolved. Is preferably polymerized in a state of being suspended, dispersed or emulsified in water, and after the polymerization is completed, the organic solvent is removed.

The average particle size of the hydrophobic oil-absorbing powder used in the present invention is not particularly limited, but is preferably 0.5 to 50 μm, and more preferably a spherical powder of 1 to 20 μm from the viewpoint of feel. As a specific example of such a hydrophobic oil-absorbing powder,
Porous nylon powder such as Olgasol 2002 (manufactured by Elf Autochem); dimethyl silicone crosslinked elastomer such as Trefil E-506C (manufactured by Dow Silicone Toray); Microsphere M, Microsphere M-100, Microsphere Polymethyl methacrylates such as Fair M-300 and Microsphere M-400 (manufactured by Matsumoto Yushi Co., Ltd.); and the following general formulas (2) and (3) such as polytrap (manufactured by Dow Corning)

[0011]

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(Wherein, R ² and R ³ are the same or different and each represent a linear or branched alkyl group or alkylene group having 1 to 30 carbon atoms.) A methacrylate copolymer having a structural unit represented by the formula: Coalescence; porous vinyl-based polymers and the like.

[0013] A preferable blending amount of the hydrophobic oil-absorbing powder in the gel cosmetic is preferably 0.1 to 10% by weight (hereinafter simply referred to as "%"), and particularly preferably 0.5 to 5%. Is preferred from the viewpoint of sebum absorption ability and feel.

The alkyl-modified carboxyvinyl polymer used in the present invention is not particularly limited, but it is necessary that the alkyl-modified carboxyvinyl polymer has an ability to disperse an aqueous oil with an aqueous thickener. Specifically, for example, an acrylic acid / alkyl methacrylate copolymer is preferable. Such an acrylic acid / alkyl methacrylate copolymer has the following general formula (1)

[0015]

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(Wherein, R ¹ represents an alkyl group having 10 to 30 carbon atoms, X and Y each represent a mol% of each structural unit in the copolymer, and X = 80.0 to 99.9 mol) %, Y = 0.1 to 20.0 mol%). Commercially available products include Carbopol 1342, PEMULEN TR1, PEMU
LEN TR-2 (both manufactured by Goodrich Co.).

The alkyl-modified carboxyvinyl polymer may be used alone or as a mixture of two or more kinds. The compounding amount is preferably 0.01 to 2%, particularly preferably 0.1 to 2%.
It is preferable that the content be 1% from the viewpoint of shape retention and feel.

The basic substance used in the present invention includes:
There is no particular limitation, as long as it neutralizes the alkyl-modified carboxyvinyl polymer. Specifically, L-
Basic amino acids such as arginine, L-lysine, histidine, ortinine and canavanine; hydroxides such as sodium hydroxide and potassium hydroxide; triethanolamine;
Organic amines such as amino-2-methylpropanol and ammonia are exemplified. Among these, basic amino acids are preferred because of their low skin irritation.

The basic substance may be used alone or as a mixture of two or more kinds. The compounding amount is such that the pH of the composition after neutralizing the alkyl-modified carboxyvinyl polymer is 5 to 8. It is preferable that the amount be as small as possible.

The gel cosmetic of the present invention may contain other optional components usually used in cosmetics in addition to the above-mentioned essential components, as long as the effects of the present invention are not impaired. Examples of such optional components include water-soluble polymers other than those described above, antioxidants, ultraviolet absorbers, chelating agents, coloring agents, fragrances, cosmetic powders, preservatives, lower alcohols, and the like. However, it is preferable not to mix liquid oil from the viewpoint of stickiness and suppression of shininess due to sebum.

[0021]

EFFECT OF THE INVENTION The gel-like cosmetic of the present invention has an excellent feeling of use because the gel is instantaneously disintegrated on the skin, is easy to spread, has no sticky feeling, and has no shine due to sebum.

[0022]

The present invention will be further described with reference to examples, but the present invention is not limited thereto.

Example 1 Gel cosmetics of the present invention products 1 to 4 and comparative products 1 to 3 having the compositions shown in Table 1 were prepared, and their appearance and ease of spreading when applied to the skin by 10 expert panelists. The non-stickiness and the effect of suppressing shine were evaluated. The ease of spreading on the skin and the feeling of stickiness were evaluated on a three-point scale in the state when the sample was applied to the forehead, and the effect of suppressing shine was evaluated on the shine state six hours after application. Table 1 shows the results.

Evaluation criteria for ease of spreading on skin and lack of stickiness ○: good Δ: somewhat good ×: poor Evaluation criteria for suppression of shine ○: state without shine △: state with a little shine ×: fat Floating, shiny

[0025]

[Table 1]

Example 2 Gel Composition for Face Ingredients Component Blending Amount (%) Porous Vinyl Polymer 2.0 Glycerin 2.0 Ethanol 5.0 Alkyl-Modified Carboxyvinyl Polymer 0.3 L-Arginine 0.2 Paraoxybenzoate Methyl acid 0.1 Water Remainder Total 100.0 Production method: A gel cosmetic for face was prepared by dissolving an alkyl-modified carboxyvinyl polymer in water, sequentially adding components such as glycerin and neutralizing with L-arginine. .

Example 3 Gel Composition for Body Ingredients Compounding Amount (%) Porous Nylon Powder 2.0 Polyoxyethylene Hydrogenated Castor Oil (60E.O.) 1.0 Glycerin 1.0 Ethanol 2.0 Alkyl-Modified Carboxyvinyl polymer 0.3 Potassium hydroxide 0.15 Oxybenzone 0.1 Methyl parahydroxybenzoate 0.1 Perfume 0.1 Water Remainder 100.0 Production method: Prepared in the same procedure as in Example 2.

Example 4 Gel Composition for Hands Ingredients Compounding Amount (%) Dimethyl Silicone Crosslinked Elastomer 2.0 Polyoxyethylene Hydrogenated Castor Oil (60E.O.) 1.0 1,3-butylene glycol 3.0 Glycerin 3.0 Alkyl-modified carboxyvinyl polymer 0.5 Triethanolamine 0.5 Oxybenzone 0.1 Aloe extract 0.5 Methyl parahydroxybenzoate 0.1 Perfume 0.1 Water Remainder 100.0 Production method: Example 2 Prepared in a similar procedure.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-97644 (JP, A) JP-A-7-300410 (JP, A) JP-A-63-316715 (JP, A) (Catalog for cosmetic raw materials), Toshiba Silicone Co., Ltd. (58) Fields surveyed (Int. Cl. ⁷ , DB name) A61K 7/00 A61K 7/48

Claims (4)

(57) [Claims] (1) Squalane having an oil absorption of 2.0 g /
g of hydrophobic oil-absorbing powder of 0.1 to 10% by weight, (b)
The following general formula (1) (Wherein, R ¹ represents an alkyl group having 10 to 30 carbon atoms;
X and Y each represent mol% of each structural unit in the copolymer, X = 80.0 to 99.9 mol%, Y = 0.1
~ 20.0 mol%. A gel-like skin cosmetic comprising 0.01 to 2% by weight of the alkyl-modified carboxyvinyl polymer represented by the formula (1) and (c) a basic substance. (C) adding a basic substance to the composition at a pH of 5 to 8;
The gel-like skin cosmetic according to claim 1, which contains the following amount. 3. A hydrophobic oil-absorbing powder comprising: an ester of methacrylic acid and a higher alcohol having 8 to 24 carbon atoms; an ester of acrylic acid and a higher alcohol having 8 to 24 carbon atoms; styrene; One or two of vinyl monomers selected from the group consisting of styrene derivatives having a hydrocarbon substituent, vinyl esters of saturated carboxylic acids having 8 to 20 carbon atoms, acrylic acid, methacrylic acid and diolefins having 4 to 6 carbon atoms. The gel-like skin cosmetic according to claim 1 or 2, which is a polymer obtained by polymerizing and making at least one species porous. 4. The hydrophobic oil-absorbing powder has an average particle size of 0.5 to 5
The gel-like skin cosmetic according to any one of claims 1 to 3, which is a spherical powder of 0 µm.