JP6632056B2 - Gel cosmetics - Google Patents

Description

  The present invention relates to a gel cosmetic containing a water-absorbing polymer.

  Gel cosmetics have been applied to various cosmetics, including basic cosmetics, hair care cosmetics, and makeup cosmetics, because of their good usability. Various thickeners are used in such a gel cosmetic according to the viscosity and appearance. Specifically, carboxyvinyl polymers having a thickening effect, xanthan gum, cellulose, guar gum, and water-soluble polymers such as polyacrylic acid are used. These can be prepared from low-viscosity cosmetics such as thickening lotions to solid gels such as hair ticks by selectively using these depending on the application and by changing the amounts and components of the lotions.

  Carboxyvinyl polymers and salts thereof are often used because they can be gelled in a small amount and can be used in combination with an emulsifier, but in the gel structure produced by carboxyvinyl polymers, the gel structure is easily broken in the presence of a salt. And that it is susceptible to pH. Further, when the amount of the thickener is increased in order to obtain a high-viscosity composition, there is a problem that stickiness or swelling occurs during application. Furthermore, a technique (Patent Document 1) in which a salt-resistant alkylated starch or an alkyl methacrylate / acrylic acid copolymer is used in combination is known. However, such a method tends to make the gel hard and brittle. there were.

  In addition, in terms of improving feel, there is a gel composition (Patent Literature 2) that is free from twisting and is composed of a combination of polyacrylamide, an inorganic salt of polyacrylic acid, a non-polar hydrocarbon oil, an ester oil, and a nonionic surfactant. In addition, there has been a problem in that the optimization has to be performed by combining various kinds of raw materials, and the operation is complicated and it takes time for the examination.

  Among polyacrylic acid-based water-soluble polymers, those having a thickening effect are widely used for adjusting the viscosity of cosmetics, and specifically, alkyl acrylate / acrylic acid copolymer, alkyl methacrylate / methacrylic acid Copolymers, alkyl acrylate / acrylic acid crosspolymers and salts thereof.

  Incidentally, polyacrylates include not only the type having the above-mentioned thickening effect, but also the type having no thickening effect but having excellent water absorption. These are widely used as water absorbing materials such as disposable diapers and sanitary articles. Polyacrylates used as these water absorbing agents do not have a thickening effect and have a large particle diameter and a large volume change rate, and thus have not been applied as cosmetic raw materials.

JP 2000-327516 A JP-A-2002-138030

  It is an object of the present invention to provide a gel cosmetic which has a good feel at the time of application and good formulation stability by using a water-soluble polymer having excellent water absorbency.

By using a polyacrylic acid-based water-absorbing polymer having a specific water-absorbing ability, instead of a water-soluble polymer having a thickening effect generally used in gel cosmetics, it has a fresh feel and the stability of the formulation They found that a good gel-like cosmetic could be easily provided, and completed the invention. Specifically, gel cosmetics formed by general water-soluble polymers increase in viscosity from viscous fluids to gels, etc., with the increase in the amount of the water-soluble polymers mixed with water-soluble components. Show behavior. On the other hand, a polyacrylic acid-based water-absorbing polymer having a specific water-absorbing capacity can be adjusted to a water-soluble content (amount of an aqueous phase) in the vicinity of the water-absorbing capacity to form a gel-like cosmetic formed by a general water-soluble polymer. In contrast to this, it was found that a gel having a more fresh feel was formed, which was not sticky and had little feeling after application. When the blending amount of the polyacrylic acid-based water-absorbing polymer is smaller than the value obtained by dividing the water-soluble content in the cosmetic by the water-absorbing magnification of the polyacrylic acid-based water-absorbing polymer, it takes longer to completely absorb the water-soluble component. If it takes time and is not preferable for industrialization, and if it is large, the powdery feel of the polyacrylic acid-based water-absorbing polymer becomes strong, which is also not preferable for industrialization.
That is, the present invention is a gel cosmetic comprising a polyacrylic acid-based water-absorbing polymer, wherein the polyacrylic acid-based water-absorbing polymer has an average particle diameter of 1 to 30 μm and a water absorption capacity of 5 to 50 g. / G.

  According to the present invention, it is possible to provide a gel cosmetic having good preparation stability and having a fresh feel upon application.

Hereinafter, the present invention will be described in detail.
The polyacrylic acid-based water-absorbing polymer used in the present invention has a feature that the average particle diameter is 1 to 30 μm and the water absorption ratio is 5 to 50 g / g. From the viewpoint of water absorption, the polyacrylic acid-based water-absorbing polymer of the present invention is preferably an ammonium salt or a potassium salt, and is preferably an oval or spherical polymer from the viewpoint of good swellability in water.
The water absorption capacity of the polyacrylic acid-based water-absorbing polymer is preferably from 5 to 50 g / g, more preferably from 10 to 30 g / g.
The average particle size of the polyacrylic acid-based water-absorbing polymer is preferably from 1 to 30 μm, more preferably from 10 to 25 μm. In the gel cosmetic of the present invention, the polyacrylic acid-based water-absorbing polymer exists as particles having an average particle diameter in the above-mentioned range.
The water absorption capacity and the average particle size of the polyacrylic acid-based water-absorbing polymer were measured by the methods described in Examples below.

In general, polyacrylic acid-based polymers can be divided into thickening polymers such as sodium polyacrylate and water-absorbing polymers such as ammonium polyacrylate and potassium polyacrylate. The polymer does not show a thickening effect.
Among the polyacrylic acid-based water-absorbing polymers, those having a water absorption capacity of more than 50 g / g are widely used as raw materials for absorbents such as disposable diapers and sanitary napkins. In the gel cosmetic of the present invention, those whose water absorption capacity is adjusted to 5 to 50 g / g can be used. The polyacrylic acid-based water-absorbing polymer is preferably a polyacrylic acid crosspolymer, and furthermore, ammonium polyacrylate, potassium polyacrylate, and the like. As a commercially available product, absorbent resin fine particles ARON NT-K (Made by Toagosei Co., Ltd.).

The polyacrylic acid-based water-absorbing polymer of the present invention can be prepared by a usual method for preparing cosmetics, but because of its ability to easily absorb water, it does not require any special technology or equipment, and can be used in any water-soluble polymer. A gel cosmetic can also be prepared only by mixing with the components.
In the present invention, the ratio of the blending amount of the polyacrylic acid-based water-absorbing polymer to the blending amount of the aqueous component (including water) in the gel cosmetic may be close to the water absorption capacity of the polyacrylic acid-based water-absorbing polymer. preferable.
Specifically, the content (g) of the aqueous phase in the gel cosmetic is preferably ± 40%, more preferably ± 30%, of the water absorption capacity of the polyacrylic acid-based water-absorbing polymer per g. is there. The aqueous phase is a liquid medium containing water, and contains water and any components dissolved in water.
The content of the polyacrylic acid-based water-absorbing polymer in the gel cosmetic is preferably 1 to 10% by mass. If the amount of the polyacrylic acid-based water-absorbing polymer is less than 1% by mass, it may take a long time to completely absorb water, which is not preferable in the production process. If the amount is more than 10% by mass, the gel becomes hard. In some cases, the function is inferior in terms of usability. Furthermore, the gel-like cosmetic of the present invention may have an even smoother feel when applied to the skin by incorporating an oily component generally added to the cosmetic.
According to the present invention, a method for producing a gel cosmetic in which a polyacrylic acid-based water-absorbing polymer having an average particle diameter of 1 to 30 μm and a water absorption ratio of 5 to 50 g / g is mixed with a liquid medium containing water. A gel cosmetic, wherein the liquid medium is mixed in an amount of ± 40%, preferably ± 30%, of the water absorption capacity of the polyacrylic acid-based water-absorbing polymer per 1 g of the polyacrylic acid-based water-absorbing polymer. Is provided. Preferred embodiments of the polyacrylic acid-based water-absorbing polymer in this production method are as described above.

  Examples of the gel-like cosmetic of the present invention include lotions, cosmetics, basic cosmetics such as milky lotions, foundations, makeup cosmetics such as eyeshadow, hair tonics, hair creams, and hair care cosmetics such as shampoos. There is no particular limitation. The gel cosmetic of the present invention contains water.

  Furthermore, the gel cosmetic of the present invention can be appropriately selected and used from components blended with ordinary cosmetics according to the type of the desired cosmetic. Examples of these components include liquid paraffin, hydrocarbon oils such as petrolatum, vegetable oils and fats, waxes, synthetic ester oils, silicone-based oil phase components, higher alcohols, lower alcohols, fatty acids, thickeners, and ultraviolet rays. Absorbents, powders, inorganic and organic pigments, coloring materials, various surfactants, polyhydric alcohols, saccharides, high molecular compounds, physiologically active ingredients, transdermal absorption enhancers, solvents, antioxidants, fragrances, various additives And the like, but are not limited thereto.

  Hereinafter, the present invention will be described more specifically with reference to Examples, but the present invention is not limited thereto. The compounding amount represents mass%.

The average particle diameter and the water absorption ratio of the polyacrylic acid-based water-absorbing polymer (measurement sample) were measured.
(1) Measurement method of average particle size After the measurement sample is saturated and swelled with ion-exchanged water for 30 minutes or more, the particle size distribution is measured using a laser diffraction / scattering type particle size distribution meter (MT-3000, manufactured by Nikkiso Co., Ltd.). Was.
(2) Measurement method of water absorption capacity The water absorption capacity was measured by the following formula.
Water absorption ratio = [Weight (g) of measurement sample 30 minutes after start of water absorption-Dry weight of measurement sample (g)] ÷ Dry weight of measurement sample (g)
The water absorption ratio is measured by adding ion-exchanged water to the water-absorbing polymer as a measurement sample and dispersing it sufficiently uniformly, and then measuring the weight of the water-absorbing polymer dispersed for 30 minutes or more in order to bring the water-absorbing polymer into a water-saturated swelling state. did. For the measurement of the dry weight, a measurement sample was weighed and dried at 150 ° C. in a windless drier for 60 minutes, and then the residue was measured. The operation was in accordance with JIS K 0067-1992 (Method for testing weight loss and residue of chemical products).

(3) Measurement results Table 1 shows the measurement results.

Gel preparations containing Invention Products 1 to 4 and Comparative Products 1 to 4 were prepared and evaluated for state and feel.
(1) Gel preparation method A polyacrylic acid-based water-absorbing polymer and purified water were weighed at the ratio shown in Table 2 and stirred and mixed at room temperature to prepare a gel.

(2) Evaluation method of state The state of the gel was visually evaluated in the following stages.
：: soft gel △: slightly hard gel ×: watered or solid

(3) Evaluation method of feel Using five in-house monitors, smoothness at the time of application was evaluated by the following scores, and the average score was obtained.
3: Smooth 2: Smooth 1: Squeaky or rough

(4) Evaluation results Table 2 shows the evaluation results.

  Hereinafter, application examples in which the polyacrylic acid-based water-absorbing polymer of the present invention is blended will be described, but the present invention is not limited thereto. Further, Examples 3 to 8 all confirmed excellent formulation stability and feel by the method of Example 2.

Gel lotion 1. POE (30) POP (6) decyltetradecyl ether 0.5 (% by mass)
2. Polyethylene glycol 1000 4.0
3. Preservatives qs 4. Inventive product 1 5.0
5. Hydroxyproline 0.5
6. Glycerin 3.0
7. Ethanol 5.0
8. Adjust to 100.0 with purified water.
(Preparation method) Heat 1 to 3 slightly and mix. 4 to 8 are uniformly dissolved at room temperature. While stirring 1 to 3, 4 to 8 are gradually added and mixed, and when the mixture becomes uniform, the stirring is stopped to end the preparation.

Gel-like serum 1. Xanthan gum 0.4 (% by mass)
2. Hydroxyethyl cellulose 0.1
3. Invention product 3 4.0
4.1 1,3-butylene glycol 5.0
5. Adjust to 100.0 with purified water.
6. Sodium hyaluronate qs 7. Water 5.0
8. Preservative appropriate amount 9. Ethanol 3.0
(Preparation method) 1 to 5, 6 to 7, and 8 to 9 are respectively dissolved at room temperature. While stirring 1 to 5, 6 to 7 and 8 to 9 are added to make the mixture uniform, and the preparation is completed.

Gel emulsion 1. POE (20) sorbitan monostearate 1.0
2. POE (40) sorbitol tetraoleate 1.5
3. Lipophilic glyceryl monostearate 1.0
4. Stearic acid 0.5
5. Behenyl alcohol 1.5
6. Cetyl palmitate 0.5
7. Squalane 5.0
8.2 Cetyl 2-ethylhexanoate 5.0
9. Methyl polysiloxane 0.5
10. Preservatives qs. Inventive product 2 3.5
12.1,3-butylene glycol 7.0
13. Dipropylene glycol 4.0
14． Adjust to 100.0 with purified water.
(Preparation method) 1 to 10 and 11 to 14 are heated and dissolved, and 11 to 14 are gradually added and emulsified while stirring 1 to 10 with a homomixer. Cool with paddle stirring to complete the preparation.

Gel shampoo Polyquaternium-10 0.5 (% by mass)
2.1,3-butylene glycol 5.0
3. Preservatives qs 4. Purified water 10.0
5. Cocamide diethanolamine 3.0
6. Sodium laureth sulfate (27% aqueous solution) 25.0
7. Cocoyl methyl taurine sodium (30% aqueous solution) 15.0
8. Cocoyl propyl betaine 10.0
9. Invention product 2 4.0
10. pH adjuster qs. Chelating agent appropriate amount 12. Suitable amount of fragrance 11. Adjust to 100.0 with purified water.
(Preparation method) 1 to 4 are uniformly mixed in advance, and 5 to 9 are sequentially added to 1 to 4 and mixed while heating. Add the previously homogenized 10 to 13 to A, stir until uniform, cool, and complete the preparation.

Gel cleansing 1.1,3-butylene glycol 5.0 (% by mass)
2. Glyceryl-7 coconut oil fatty acid 5.0
3. Inventive product 1 5.5
4. Preservative appropriate amount5. pH adjuster qs 6. Chelating agent qs 7. Adjust to 100.0 with purified water.
(Preparation method) 1 to 7 are mixed, and the process is completed when the mixture becomes uniform.

Gel foundation1. Mica 10.0 (% by mass)
2. Pigment grade titanium oxide 5.0
3. Yellow iron oxide 1.0
4. Bengara 0.3
5. Black iron oxide 0.05
6. Inventive product 4 4.0
7. Glycerin 5.0
8. Stearoyl methyl taurine sodium 0.5
9. Preservative appropriate amount 10. pH adjuster qs. Chelating agent appropriate amount 12. Adjust to 100.0 with purified water.
(Preparation method) 1 to 5 are preliminarily mixed, and 6 to 12 are mixed.

ADVANTAGE OF THE INVENTION This invention can provide the gel-like cosmetics which have good feeling at the time of application | coating, and favorable formulation stability.

Claims (3)

A gel cosmetic comprising a polyacrylate having an average particle size of 1 to 30 μm and a water absorption capacity of 5 to 50 g / g. Polyacrylic acid salt, a gel-like cosmetic according to claim 1, characterized in that the potassium ammonium polyacrylate and / or polyacrylic acid. The gel cosmetic according to claim 1 or 2, wherein the polyacrylate is a crosspolymer.