JP7175556B2 - Cosmetic gel composition - Google Patents

Description

TECHNICAL FIELD The present invention relates to a gel-like cosmetic composition.

A large number of gel-like cosmetics are provided. There are various techniques for forming gels (gels), but aqueous gelling agents such as polysaccharides and synthetic polymer compounds are generally added to aqueous cosmetics and O/W type cosmetics. Therefore, a technique of gelling the composition is employed. Carboxyvinyl polymers, among others, are widely used as gelling agents for cosmetics because of their high viscosity-increasing properties, their ability to impart a fresh and refreshing feeling when applied to the skin, and their ease of handling.

Carboxyvinyl polymers are synthetic anionic polymeric compounds that are primarily acrylic acid polymerized. When dissolved in water and neutralized with an alkaline agent, it readily forms a gel, and is therefore the first choice as a thickening agent for cosmetic compositions.
However, gel compositions formed from carboxyvinyl polymer are known to have a problem that the viscosity of the composition decreases due to light (ultraviolet rays) and changes over time. For this reason, a number of techniques have been proposed for suppressing the viscosity reduction of gel compositions formed from carboxyvinyl polymer. A representative technique is to add an inorganic acid or an organic acid to suppress the viscosity reduction. There have been proposed a method of using a gelling agent, a method of using other gelling agents in combination, and the like.

For example, US Pat. No. 6,200,000 describes thickening compositions comprising carboxyvinyl polymers and/or alkyl-modified carboxyvinyl polymers and N-acylated amino acids. It is also described that this composition is inhibited from lowering in viscosity due to ultraviolet rays.
Patent Document 2 describes a thickening composition containing a gum substance selected from the group consisting of carboxyvinyl polymer, xanthan gum and carrageenan, and a cellulosic polymer selected from hydroxypropyl cellulose and hydroxyethyl cellulose. It is described that this composition is not easily affected by ultraviolet rays and ingredients, and does not cause a decrease in stability.

Patent Document 3 discloses an emulsion composition containing an alkyl-modified carboxyvinyl polymer and metaphosphoric acid. This emulsion composition is described as having excellent photostability.
Patent Document 4 contains (a) one or more plant extracts, (b) carboxyvinyl polymer, and (c) one or more water-soluble alkali metal salts of organic acids or inorganic acids. and has a viscosity of 500-3000 cps. Examples of water-soluble alkali metal salts of organic acids or inorganic acids include trisodium citrate, monosodium phosphate, disodium phosphate, potassium phosphate, dipotassium phosphate and sodium succinate. This composition is described as being inhibited from lowering in viscosity due to high-temperature storage.

Patent Document 5 describes a makeup cosmetic containing a water-soluble carboxyvinyl polymer, a basic substance, dextrin, methylcellulose, and trisodium edetate or trisodium ethylenediaminehydroxyethyltriacetate. It is described that this cosmetic has good viscosity stability even when used for a long period of time, and that there is no change in the stability of the cosmetic even after one month has passed.

The present applicant also found that quercetin or quercetin glycosides are useful as stabilizers for gels formed from carboxyvinyl polymers. has filed a patent application for an invention of a cosmetic containing a high molecular weight compound (see Patent Document 6).

JP 2013-256472 A JP 2007-246667 A JP-A-09-19632 JP-A-09-52814 JP-A-10-306015 JP 2001-226214 A

Gel-like compositions containing carboxyvinyl polymer, as described in the prior art, have a problem in that the viscosity decreases due to ultraviolet rays and long-term storage, and several proposals have been made to solve this problem. was also not entirely satisfactory.
The inventors of the present application have found that when a gel composition containing a carboxyvinyl polymer contains citric acid and/or a salt thereof and a sugar and/or a sugar alcohol, the decrease in the viscosity of the composition due to light irradiation is remarkably suppressed. A phenomenon was discovered.
The present invention is made based on this finding.
That is, an object of the present invention is to provide a gel-like composition and a gel-like cosmetic having excellent viscosity stability obtained by combining a carboxyvinyl polymer, citric acid and/or a salt thereof, and a sugar and/or a sugar alcohol. and Another object of the present invention is to provide a new technique for stabilizing gel cosmetics.

The configuration of the present invention is as follows.
(1) A gel composition containing the following (A) to (C).
(A) carboxyvinyl polymer (B) citric acid and/or salts thereof (C) one or more substances selected from sugars and/or sugar alcohols (2) (B) content of citric acid and/or salts thereof , The gel composition according to (1), which is 0.001 to 0.03% by mass as citric acid per gel composition.
(3) The gel according to (1) or (2), wherein the sugar contains one or more selected from glucose, raffinose and trehalose, and the sugar alcohol contains one or more selected from sorbitol, mannitol, erythritol and glycerin. composition.
(4) The gel composition according to any one of (1) to (3), wherein the sugar and/or sugar alcohol content is 0.5 to 10% by mass.
(5) The gel composition according to any one of (1) to (4), which is used for cosmetics.

The gel composition of the present invention provides a high viscosity and a fresh and refreshing feel when applied. In addition, since the viscosity does not easily decrease even when irradiated with light, the gel state is maintained without necessarily filling the light-shielding container, and the product can be provided in a state with excellent long-term stability. The gel-like composition of the present invention has a good feel when used, and even when stored for a long period of time, the viscosity change (viscosity reduction) due to light is unlikely to occur, and the container to be filled is not limited. In addition, citric acid and/or its salts and sugars and/or sugar alcohols, which are the components of the present invention, are highly safe ingredients and do not add color or odor to the composition itself. The gel composition of the present invention composed of is also transparent to translucent and almost odorless. Therefore, it has a wide range of application as a cosmetic, and can be used for coloring and fragrance. The gel composition of the present invention is optimally used as a cosmetic.

1 is a graph showing the results of preliminary test 1 confirming that a gel composition containing a carboxyvinyl polymer is reduced in viscosity by light irradiation.

The present application relates to gel compositions and gel cosmetics containing (A) carboxyvinyl polymer, (B) citric acid and/or salts thereof, and (C) sugar and/or sugar alcohol.
In the specification of the present application, the terms "gel" and "gel" are used interchangeably, but both have the same meaning. The gel-like composition of the present invention is characterized in that its viscosity does not easily decrease even when exposed to light. Therefore, not only high-viscosity liquids (jelly-like liquids) but also liquid medium-viscosity liquids are included in the present invention as long as the viscosity retention rate before and after light irradiation exceeds 55%. The gel composition of the present invention has a viscosity of 5000 mPa·s or more before light irradiation and a viscosity retention rate of more than 55% after light irradiation. More preferably, the viscosity is 10000 to 100000 mPa s when measured with a Brookfield viscometer (25 ° C., No. 4 rotor or No. 3 rotor, 12 revolutions, 30 seconds), and the viscosity maintenance rate after light irradiation is more than 55%.

(A) Component: Carboxyvinyl Polymer Carboxyvinyl polymer is a water-soluble polymer having a carboxyl group, and is mainly a polymer of acrylic acid.
Carboxyvinyl polymer is a white, acidic powder with a pH of about 3 in a 1% aqueous solution. Carboxyvinyl polymer can be neutralized with a basic compound to prepare various mucilages (gels) with different viscosities. Basic compounds used for neutralization include triethanolamine, monoethanolamine, diisopropanolamine, triethylamine, sodium hydroxide, potassium hydroxide, arginine, and the like. The amount of the basic compound to be blended is not particularly limited, and may be appropriately adjusted so that the viscosity of the gel composition or cosmetic is within a suitable range.
The carboxyvinyl polymer used in the present invention may be a commercially available product commonly used as a thickening agent, such as NTC-CARBOMER 380/381 (Nikko Chemicals), Hibis Wako 103/104/105 (Fuji Film Wako Pure Chemical). and Carbopol 980/981 (Nippon Lubrizol).
The content of the carboxyvinyl polymer is preferably 0.05 to 1% by mass, more preferably 0.1 to 0.7% by mass, based on the composition. If the amount is less than 0.05% by mass, there is a possibility that sufficient viscosity cannot be obtained. If the content exceeds 1% by mass, there is a possibility that the feeling of use may be deteriorated, such as feeling slimy.

(B) Component: Citric acid and/or its salt The gel composition of the present invention contains citric acid and/or a salt of citric acid as an essential component. The salt of citric acid is preferably sodium salt or potassium salt. The gel composition of the present invention preferably contains 0.001 to 0.03% by mass of citric acid or a salt of citric acid as citric acid per composition. If the content is less than 0.001% by mass, the effect of preventing the decrease in viscosity of the gel composition may be reduced. Moreover, if it exceeds 0.03% by mass, stickiness may occur.
Citric acid and/or its salt maintains the stability of the gel-like composition formed by the carboxyvinyl polymer and prevents viscosity reduction by coexisting with the sugar and/or sugar alcohol of component (C).

(C) Component: Sugar and/or Sugar Alcohol The sugar referred to in the present invention is monosaccharide or oligosaccharide. A monosaccharide is an aldose having an aldehyde group or a ketose having a ketone group, such as triose, tetrose, pentose, hexose, and hexose. Any sugar (heptose) may be used. Glyceraldehyde and dihydroxyacetone as three-carbon sugars, erythrose, threose and erythrulose as four-carbon sugars, ribose, arabinose, lyxose, xylose, apiose, ribulose and xylulose as five-carbon sugars, allose and alto as hexoses Lose, glucose, mannose, gulose, idose, galactose, talose, psicose, fructose, sorbose, tagatose, and the heptasaccharide include sedoheptulose and colyose.
In the case of monosaccharides, glucose, mannose, and galactose are preferred, and glucose is particularly preferred, because of their availability.
Oligosaccharides are two or more monosaccharides linked by glucosidic bonds. Examples of disaccharides include maltose, trehalose, and isomaltose, which are bound to two molecules of glucose. In addition, lactose and sucrose, which are heterodisaccharides having different constituent monosaccharides, can also be used. As the disaccharide, trehalose in which glucose is α1-1 linked is particularly preferred. Examples of trisaccharides include raffinose and maltotriose, with raffinose being particularly preferred.

The sugar alcohol referred to in the present invention is a compound produced by reduction of the carbonyl group of aldose or ketose. In the present invention, any substance can be used as long as it is a compound that is commonly used in foods, pharmaceuticals, or cosmetics. Preferred substances include glycerin, erythritol, sorbitol, mannitol and maltitol. Sorbitol is particularly preferred.
Derivatives such as galactosylglycerol and glucosylglycerol, which are reaction products of sugar and sugar alcohol, can also be used in the present invention.
The gel composition of the present invention preferably contains sugar and/or sugar alcohol in an amount of 0.5 to 10% by mass, preferably 1 to 5% by mass. The sugar and/or sugar alcohol maintain the stability of the gel formed by the carboxyvinyl polymer and prevent viscosity reduction by coexisting with the citric acid and/or its salt of component (B).

The gel composition of the present invention preferably contains water. Water is preferably purified water. The content of water relative to the total amount of the gel composition of the present invention is not particularly limited, but it is preferably 20 to 98% by mass, more preferably 40 to 98% by mass, from the viewpoint of feeling during use. In addition, the present invention can be applied to a system thickened with a carboxyvinyl polymer even if it does not contain water, for example, a thickened composition of a carboxyvinyl polymer, ethanol and a basic substance, or a thickened composition of a carboxyvinyl polymer, glycerin and a basic substance. can also be applied. However, even these non-aqueous systems require water for dissolving citric acid and/or its salts and blending them into the composition.

The gel composition of the present invention may optionally contain surfactants, oils, cosmetic ingredients, pigments, fragrances, etc., as long as they do not impair the effects of the present invention.

Examples of surfactants include polyoxyethylene hydrogenated castor oil, polyglycerin fatty acid ester, polyoxyethylene sorbitan fatty acid ester, sucrose fatty acid ester, polyoxyethylene alkyl ether, polyether-modified silicone and the like.

Examples of oils include olive oil, camellia oil, macadamia nut oil, avocado oil, carnauba wax, candelilla wax, jojoba oil, beeswax, lanolin, liquid paraffin, paraffin, petrolatum, ceresin, microcrystalline wax, squalene, squalane, and isopropyl myristate. , 2-octyldodecyl myristate, cetyl 2-ethylhexanoate, methylpolysiloxane, methylphenylpolysiloxane, and the like.

Examples of cosmetic ingredients include sodium hyaluronate, PCA-Na, and sour extract.

The gel-like composition of the present invention is a gel-like (gel-like) dosage form. Particularly preferred is an aqueous gel dosage form. The viscosity of the gel-like composition of the present invention is preferably 5000 mPa s or more, and preferably 10000 mPa s when measured with a Brookfield viscometer (25°C, No. 4 rotor or No. 3 rotor, 12 revolutions, 30 seconds). It is preferably up to 100,000 mPa·s, and more preferably 10,000 to 70,000 mPa·s.
The gel-like composition of the present invention is characterized in that its viscosity does not easily decrease even when exposed to light. The gel composition of the present invention has a viscosity of 5000 mPa·s or more before light irradiation and a viscosity retention rate of more than 55% after light irradiation.

The gel composition and gel cosmetic of the present invention can be produced by a conventional method. After neutralizing the carboxyvinyl polymer aqueous solution, component B (citric acid and/or its salt) and component C (sugar and/or sugar alcohol) may be added, or after all the components are put into a container, they are mixed and stirred. You can

EXAMPLES The present invention will be specifically described below by preparing gel-like cosmetics of preliminary test examples, examples and comparative examples, and showing evaluation tests using them.
<Preliminary test example>
A 0.3% carboxyvinyl polymer aqueous solution was neutralized with potassium hydroxide and adjusted to pH 5.7 to form a gel. Next, using a Q-SUN Xe-1 Xenon Test Chamber manufactured by Q-Lab Corporation, light irradiation was performed under the conditions of an irradiance of 40 W/m ² (illuminance measurement wavelength range of 300 to 400 nm) and a black panel temperature of 40°C. After sampling the samples with light irradiation times of 0 h, 4 h, 8 h, and 24 h and adjusting the sample temperature to 25 ° C., using a B-type viscometer (25 ° C., No. 3 rotor, 12 rotations, 30 seconds, range 5) Viscosity was measured. The measurement results are shown in FIG.

As shown in FIG. 1, it was confirmed that the viscosity of the thickened composition (gel-like composition) of the carboxyvinyl polymer decreased by light irradiation from the xenon lamp. It was confirmed that the viscosity decreased depending on the light irradiation time, and that the viscosity significantly decreased after 24 hours of irradiation.

<Example/Comparative example>
EXAMPLES Gel compositions of Examples and Comparative Examples were prepared, and the effect of the gel composition of the present invention on suppressing a reduction in the viscosity of the gel due to light irradiation was evaluated.
1. Test method (1) Preparation of gel compositions Gel compositions shown in Tables 1 and 2 (Examples) and Table 3 (Comparative Examples) were prepared.
After each component was weighed to a total weight of 200 g, the mixture was stirred at 5000 rpm for 3 minutes with a desktop homomixer. After that, 100 g of the defoamed gel cosmetic was filled in a glass bottle. This was used as a sample for the tests described below.

(2) Light irradiation test Using a Q-SUN Xe-1 Xenon Test Chamber manufactured by Q-Lab Corporation, the conditions were an irradiance of 40 W/m ² (illuminance measurement wavelength range of 300 to 400 nm), a black panel temperature of 40°C, and an irradiation time of 24 hours. A light irradiation test was performed at

(3) Viscosity measurement test Viscosity before and after the light irradiation test was measured at a sample temperature of 25°C with a Brookfield viscometer (No. 3 rotor, 12 revolutions, 30 seconds, range 5). The viscosity measurement was performed twice for each sample, and the average value was used for evaluation.
Viscosity retention rate (%)={(viscosity after light irradiation)/(viscosity before light irradiation)}×100 was used to evaluate the effect of suppressing viscosity reduction (thinning). The calculated values are listed in the table as they are, but when evaluating the viscosity retention rate (%), the values after the decimal point are rounded down and evaluated according to the following criteria.
As the evaluation of the viscosity reduction suppressing effect (viscosity reduction suppressing effect), the criteria for evaluating the viscosity retention rate are as follows.
◎: 81% or more ○: 71 to 80%
△: 55-70%
×: less than 55%

(4) Sensory Evaluation Test 0.05 g of each sample was spread on the back of the hand with a blind before and after light irradiation, and one expert sensory evaluator evaluated whether differences in viscosity of the samples could be identified. By this sensory evaluation test, it was judged that the effect of suppressing a decrease in viscosity (the effect of suppressing a decrease in viscosity) was not obtained when the difference in the viscosity of the sample could be clearly identified.
○: No difference in viscosity △: Somewhat noticeable difference in viscosity ×: Clear difference in viscosity

2. Test Results The results are shown in the lower part of Tables 1-3.

The viscosities of the gel-like compositions of Examples 1 to 28 were in the range of 10000 to 70000 mPa s before light irradiation. , 9 to 11, 13 to 15, 17, 19 to 21, 23 to 25 and 27 are ◎ evaluation (viscosity maintenance rate is 81% or more), Example 8 is ○ evaluation (viscosity maintenance rate is 71 to 80%), Examples 12, 16, 18, 22, 26 and 28 were evaluated as Δ (viscosity retention rate of 55 to 70%). Further, in the sensory evaluation test after light irradiation, the gel compositions of Examples 1 to 28 all exhibited a level of viscosity reduction due to light irradiation that could hardly be discerned by the sensory test. From these test results, it was determined that the thickening composition (gel) containing the carboxyvinyl polymer according to the present invention has an extremely high viscosity reduction suppressing effect (viscosity suppressing effect). Furthermore, none of the gel compositions of Examples 1 to 28 was sticky or creaky, and did not impair the fresh and refreshing feeling of use peculiar to gel compositions using a carboxyvinyl polymer. It was a feeling of use.
On the other hand, in the gel compositions of Comparative Examples 1 to 17, the viscosity decrease due to light irradiation was remarkable, the viscosity retention rate after light irradiation was less than 55%, and the viscosity decrease suppression effect (viscosity reduction suppression effect) was evaluated as ×. . Also in the sensory evaluation test, the gel compositions of Comparative Examples 1 to 15, which did not adopt the constitution of the present invention, were all identified by the sensory test at a level where the decrease in viscosity due to light irradiation was clearly recognized.
As shown in Comparative Examples 3 to 9, citric acid alone (Comparative Examples 3 and 4) is not as effective in suppressing viscosity reduction as compared to other organic acids (Comparative Examples 5 to 9). In addition, as shown in Comparative Examples 10 to 13, even sorbitol and mannitol alone had a low effect of suppressing viscosity reduction. In addition, as shown in Comparative Examples 14 to 17, when phytic acid, lactic acid, sodium gluconate, adenosine triphosphate and sorbitol were combined, the effect of suppressing viscosity reduction was low. From these results, it was found that only a combination of citric acid and/or its salt and sugar and/or sugar alcohol exhibits a specific and remarkable effect of suppressing viscosity reduction.
As described above, it was confirmed from the evaluation results of Examples and Comparative Examples that the gel composition of the present invention can suppress a decrease in viscosity due to light irradiation. In particular, it was found that the carboxyvinyl polymer gives a fresh and refreshing feeling when applied to the skin, and is most suitable for cosmetics.

Claims (3)

A gel composition containing the following (A) to (C) and further containing 40 to 98% by mass of water based on the gel composition.
(A) 0.1 to 0.7% by mass of carboxyvinyl polymer per gel composition
(B) 0.005 to 0.03% by mass of citric acid and/or a salt thereof as citric acid per gel composition
(C) one or more substances selected from glucose, raffinose, trehalose, sorbitol, mannitol, erythritol and glycerin, 1 to 10% by mass per gel composition
(However, 1. (a) 0.5 to 20% by weight of a water-soluble heat retaining agent; (b) 0.1 to 20% by weight of a hydrophilic gelling agent; and (c) i) dimethiconol, fluorosilicone and dimethicone or and ii) 1.0 to 10 weight silicone component consisting essentially of a silicone base carrier having a viscosity of 0.65 to 100 cps. %(i) to ii) ratio is 10:90 to 20:80; said ingredients have a final viscosity of 500 to 10,000 cps); except for) A gel composition having a viscosity of 5000 to 100000 mPa s when measured with a Brookfield viscometer (25 ° C., No. 4 rotor or No. 3 rotor, 12 revolutions, 30 seconds), On the other hand, a xenon lamp was used to irradiate light at an irradiance of 40 W/m ² (illuminance measurement wavelength range of 300 to 400 nm) and a black panel temperature of 40 ° C. After 24 hours of light irradiation, the composition had a viscosity of 25 ° C. 2. The gel composition according to claim 1, wherein the viscosity retention rate [{(viscosity after light irradiation)/(viscosity before light irradiation)}×100] exceeds 55% when measured at . 3. The gel composition according to claim 1, which is used for cosmetics.

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