JP2019214515A - Gelatinous composition - Google Patents

Abstract

To provide a gelatinous composition and a gelatinous cosmetic gelatinized with a carboxyvinyl polymer and/or a technique for the stabilization of a gelatinous cosmetic.SOLUTION: A gelatinous composition contains the following (A)-(C): (A) a carboxyvinyl polymer, (B) citric acid and/or a salt thereof, and (C) isomalt.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gel composition.

  Many gel-like cosmetics are provided. There are various techniques for forming a gel (gel). However, aqueous cosmetics and O / W type cosmetics generally contain an aqueous gelling agent such as a polysaccharide or a synthetic polymer compound. Then, a method of gelling the composition is employed. Above all, carboxyvinyl polymers are frequently used as gelling agents for cosmetics because of their high viscosity, the ability to give a fresh and fresh feeling when applied to the skin, and the ease of handling.

A carboxyvinyl polymer is a synthetic anionic polymer compound obtained by mainly polymerizing acrylic acid. It is easily selected as the thickener of the composition because it easily shows a gel state when dissolved in water and neutralized with an alkali agent.
However, it is known that a gel composition formed of a carboxyvinyl polymer has a problem in that the viscosity of the composition decreases due to light (ultraviolet light) or aging. For this reason, a number of techniques have been proposed for suppressing the decrease in viscosity of the gel composition formed by the carboxyvinyl polymer. As a typical technique, an inorganic acid or an organic acid is added to suppress the decrease in viscosity. And a method in which another gelling agent is used in combination.

For example, Patent Document 1 describes a thickening composition containing a carboxyvinyl polymer and / or an alkyl-modified carboxyvinyl polymer and an N-acylated amino acid. It is described that this composition suppresses a decrease in viscosity due to ultraviolet rays.
Patent Document 2 describes a thickening composition containing a gum substance selected from the group consisting of a carboxyvinyl polymer, xanthan gum and carrageenan, and a cellulosic polymer selected from hydroxypropyl cellulose and hydroxyethyl cellulose. It is described that this composition is hardly affected by ultraviolet rays and components, and does not cause a decrease in stability.

Patent Document 3 discloses an emulsion composition containing an alkyl-modified carboxyvinyl polymer and metaphosphoric acid. It is described that this emulsion composition has excellent light stability.
Patent Document 4 contains (a) one or more plant extracts, (b) a carboxyvinyl polymer, and (c) one or more water-soluble alkali metal salts of organic or inorganic acids. And a skin cosmetic composition having a viscosity of 500 to 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 suppressing the decrease 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 a good viscosity stability even when used for a long period of time, and the stability of a cosmetic after one month has not changed.

  In addition, the present applicant has found that quercetin or quercetin glycoside is useful as a stabilizer for a gel formed of a carboxoxyvinyl polymer, and contains this as an active ingredient and has high gel stability, A patent application has been filed for the invention of a cosmetic containing a hydrophilic polymer compound (see Patent Document 6).

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

As described in the prior art, the gel composition containing a carboxyvinyl polymer has a problem that the viscosity is reduced by ultraviolet light or long-term storage, and there have been several proposals for solving the problem. Was also not satisfactory enough.
The inventor of the present application has found that when a gel composition containing a carboxyvinyl polymer contains citric acid and / or a salt thereof and isomalt, a decrease in the viscosity of the composition due to light irradiation is significantly suppressed. .
The present invention has been made based on this finding.
That is, an object of the present invention is to provide a gel composition and a gel cosmetic having excellent viscosity stability, which are obtained by combining a carboxyvinyl polymer, citric acid and / or a salt thereof, and isomalt. It is another object of the present invention to provide a new technique for stabilizing a gel cosmetic.

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 a salt thereof (C) Isomalt (2) (B) The content of citric acid and / or a salt thereof is 0.001 to 1 as citric acid per gel composition. The gel composition according to (1), which is 0.03% by mass.
(3) The gel composition according to (1) or (2), which is for cosmetics.

  The gel composition of the present invention has a high viscosity and a fresh and fresh feeling 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 gel can be provided with excellent long-term stability. The gel composition of the present invention has a good feeling in use, and does not easily cause a change in viscosity (decrease in viscosity) due to light even when stored for a long period of time, and the container to be filled is not limited. In addition, citric acid and / or a salt thereof and isomalt, which are components of the present invention, are highly safe components and do not add color or odor to the composition itself. The inventive gel composition is also transparent to translucent and almost odorless. Therefore, the range of application for cosmetics is wide, and it can be colored or perfumed. Optimally, the gel composition of the present invention is used as a cosmetic.

It is a graph which shows the result of the preliminary test 1 which confirmed that the gel composition containing a carboxyvinyl polymer reduced the viscosity by light irradiation.

The present application is an invention relating to a gel composition and a gel cosmetic containing (A) a carboxyvinyl polymer, (B) citric acid and / or a salt thereof, and (C) isomalt.
In the specification of the present application, the terms “gel” and “gel” are mixed, but all have the same meaning. The gel composition of the present invention is characterized in that the viscosity does not easily decrease even when irradiated with light. Therefore, the present invention is not limited to a liquid having a high viscosity (a jelly-like liquid), but also includes a medium viscosity having a fluidity as long as the viscosity retention ratio before and after light irradiation exceeds 55%. The gel composition of the present invention has a viscosity before light irradiation of 5,000 mPa · s or more and a viscosity retention rate after light irradiation of more than 55%. More preferably, the viscosity when measured with a B-type viscometer (25 ° C., No. 4 rotor or No. 3 rotor, 12 rotations, 30 seconds) is 10,000 to 100,000 mPa · s, and the viscosity retention rate after light irradiation is More than 55%.

Component (A): carboxyvinyl polymer The 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 whose pH in a 1% aqueous solution is about 3. By neutralizing the carboxyvinyl polymer with a basic compound, various kinds of mucus (gel) having different viscosities can be prepared. Examples of the basic compound used for neutralization include triethanolamine, monoethanolamine, diisopropanolamine, triethylamine, sodium hydroxide, potassium hydroxide, and arginine. The blending amount of the basic compound is not particularly limited, and may be appropriately adjusted so that the viscosity of the gel composition or the cosmetic falls within a suitable range.
The carboxyvinyl polymer used in the present invention may be a commercially available product commonly used as a thickener, for example, NTC-CARBOMER 380/381 (Nikko Chemicals), Hibiswako 103/104/105 (Fujifilm Wako Pure Chemical). And Carbopol 980/981 (Japan Lubrizol).
The compounding amount 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 it is less than 0.05% by mass, sufficient viscosity may not be obtained. If the amount is more than 1% by mass, the feeling of use may be degraded, such as sliminess.

(B) Component: Citric acid and / or a salt thereof 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 a sodium salt or a potassium salt. In the gel composition of the present invention, citric acid or a salt of citric acid preferably contains 0.001 to 0.03% by mass of citric acid per composition. If the content is less than 0.001% by mass, the effect of preventing a decrease in the viscosity of the gel composition may be reduced. If it exceeds 0.03% by mass, stickiness may occur.
Citric acid and / or its salt maintain the stability of the gel-like composition formed by the carboxyvinyl polymer by coexisting with the isomalt of the component (C), and prevent the viscosity from decreasing.

Component (C): Isomalt Isomalt is an equimolar mixture of two disaccharides, and is specifically obtained by reducing isomaltulose obtained by an enzymatic transfer reaction of sucrose, and comprises α-D-glucopyranosyl-1 , 6-sorbitol and α-D-glucopyranosyl-1,1-mannitol. It is generally used as a food sweetener. In the present invention, commercially available reduced palatinose manufactured by Mitsui Sugar Co., Ltd. can be used as the isomalt of the present invention.
In the gel composition of the present invention, isomalt is preferably contained in an amount of 0.5 to 10% by mass, more preferably 1 to 5% by mass, based on the composition. Isomalt maintains the stability of the gel-like composition formed by the carboxyvinyl polymer and coexists with the citric acid and / or its salt of the component (B), and prevents the viscosity from decreasing.

  The gel composition of the present invention preferably contains water. The water is preferably purified water. The content of water with respect to the total amount of the gel composition of the present invention is not particularly limited, but is preferably from 20 to 98% by mass, more preferably from 40 to 98% by mass from the viewpoint of feeling of use. The present invention relates to a system thickened with a carboxyvinyl polymer without containing water, for example, a thickened composition with a carboxyvinyl polymer, ethanol and a basic substance, or a thickened composition with a carboxyvinyl polymer, glycerin and a basic substance. It is also possible to apply However, even in these non-aqueous systems, water is necessary for dissolving citric acid and / or its salt and blending it into the composition.

  The gel composition of the present invention may optionally contain a polyhydric alcohol, a surfactant, an oil agent, a cosmetic ingredient, a pigment, a fragrance, and the like as long as the effects of the present invention are not impaired.

  Examples of the polyhydric alcohol include glycols, glycerins, sugar alcohols and the like. More specifically, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, isoprene glycol, 1,3-butylene glycol, 1,2-butanediol, 1,2-pentane Glycols such as diol, 1,2-hexanediol, 1,2-octanediol and 1,2-decanediol; glycerins such as glycerin, diglycerin and polyglycerin; xylitol, trehalose, maltitol, mannitol, sorbitol, And sugar alcohols such as erythritol, arabitol, ribitol, galactitol, glucitol, erythritol and the like.

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

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

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

The gel composition of the present invention is in a gel (gel) dosage form. Particularly preferred is an aqueous gel dosage form. The viscosity of the gel composition of the present invention is preferably 5000 mPa · s or more when measured with a B-type viscometer (25 ° C., No. 4 rotor or No. 3 rotor, 12 rotations, 30 seconds). １００100,000 mPa · s, more preferably 10,000 to 60,000 mPa · s.
The gel composition of the present invention is characterized in that the viscosity does not easily decrease even when irradiated with light. The gel composition of the present invention has a viscosity before light irradiation of 5,000 mPa · s or more and a viscosity retention rate after light irradiation of more than 55%.

  The gel composition and the gel cosmetic of the present invention can be produced by a conventional method. After the carboxyvinyl polymer aqueous solution is neutralized, the component B (citric acid and / or a salt thereof) and the component C (isomalt) may be added, or all the components may be charged into a container and then mixed and stirred. When arbitrarily blending a polyhydric alcohol or the like, if the carboxyvinyl polymer is dispersed in the polyhydric alcohol in advance, it is difficult to cause mamako, and the component B, the component C, and the carboxyvinyl polymer neutralizer are sequentially added thereto. Alternatively, a mixture mixed in another container may be added.

The gel compositions of the preliminary test examples, examples and comparative examples are prepared below, and evaluation tests using the same are shown. The present invention will be specifically described.
<Preliminary test example>
A 0.3% carboxyvinyl polymer aqueous solution was neutralized with potassium hydroxide to adjust the pH to 5.7, and a gel was formed. Next, light irradiation was performed under the conditions of irradiance of 40 W / m ² (irradiance measurement wavelength range of 300 to 400 nm) and black panel temperature of 40 ° C. using Q-SUN Xe-1 Xenon Test Chamber manufactured by Q-Lab Corporation. Samples of light irradiation times of 0 h, 4 h, 8 h, and 24 h were sampled, and the sample temperature was adjusted to 25 ° C., and then using a B-type viscometer (25 ° C., No. 3 rotor, 12 rotations, 30 seconds, range 5) The viscosity was measured. FIG. 1 shows the measurement results.

  As shown in FIG. 1, it was confirmed that the viscosity of the thickening composition (gel composition) using the carboxyvinyl polymer was reduced by light irradiation with the xenon lamp. It was confirmed that the viscosity decreased depending on the light irradiation time, and that the viscosity decreased significantly after irradiation for 24 hours.

<Examples and comparative examples>
The gel compositions of Examples and Comparative Examples were prepared, and the gel composition of the present invention was evaluated for the effect of suppressing the viscosity decrease of the gel by light irradiation.
1. Test method (1) Preparation of gel composition Gel compositions of Table 1 (Example) and Table 2 (Comparative Example) were prepared.
After weighing each component to a total weight of 200 g, the mixture was stirred with a tabletop homomixer at 5000 rpm for 3 minutes. Thereafter, 100 g of the defoamed gel cosmetic was filled in a glass bottle. This was used as a sample for the test shown below.

(2) Light irradiation test Using Q-Lab Corporation's Q-SUN Xe-1 Xenon Test Chamber, irradiance 40 W / m ² (irradiance measurement wavelength range 300 to 400 nm), black panel temperature 40 ° C., irradiation time 24 h A light irradiation test was performed.

(3) Viscosity Measurement Test The viscosities before and after the light irradiation test were measured at a sample temperature of 25 ° C. with a B-type viscometer (No. 3 rotor, 12 rotations, 30 seconds, range 5). The viscosity was measured twice for each sample, and the average value was used for evaluation.
Viscosity maintenance rate (%) = {(viscosity after light irradiation) / (viscosity before light irradiation)} × 100, and the effect of suppressing the decrease in viscosity (thinning) was evaluated. In addition, although the calculated value was put on the table as it was, when evaluating the viscosity maintenance rate (%), the numerical value rounded down to the decimal point was evaluated according to the following criteria.
The criterion for evaluating the viscosity maintenance rate as the evaluation of the viscosity decrease suppressing effect (thickness suppressing effect) is as follows.
◎: 81% or more ：: 71 to 80%
Δ: 55 to 70%
×: less than 55%

(4) Sensory Evaluation Test The samples before and after light irradiation were each taken with a blind in an amount of 0.05 g on the back of the hand and spread, and one expert sensory evaluator evaluated whether or not the difference in viscosity of the samples could be identified. In the sensory evaluation test, samples in which the difference in viscosity between the samples was clearly discriminated were judged to have not obtained the effect of suppressing the decrease in viscosity (the effect of suppressing the decrease in viscosity).
：: no difference in viscosity was observed at all △: slight difference in viscosity was observed X: difference in viscosity was clearly observed Note that there was no sample evaluated in this sensory evaluation test, but viscosity was observed in similar formulations. The gel composition having a retention rate of △: (55 to 70%) was evaluated as 官能 in the sensory evaluation test (the difference in viscosity is somewhat apparent).

2. Test results The results are shown in Tables 1 and 2 below.

The viscosities of the gel compositions of Examples 1 to 8 were in the range of 10,000 to 30,000 mPa · s before light irradiation, but the viscosity retention rates after light irradiation were all 78% or more. From the numerical values of the retention ratio, Examples 1 to 7 were evaluated as ◎ (viscosity maintenance ratio exceeded 80%), and Example 8 was evaluated as ○ (viscosity maintenance ratio was 71 to 80%). Further, in the gel-like compositions having the compositions of Examples 1 to 8, in the sensory evaluation test after light irradiation, all of the gel-like compositions were at such a level that viscosity reduction due to light irradiation could not be identified. From these test results, it was determined that the thickening composition (gel) containing the carboxyvinyl polymer having the constitution of the present invention had a very high viscosity reduction suppressing effect (thinning suppressing effect). Furthermore, any of the gel compositions of Examples 1 to 8 was not sticky or squeaky, and the fresh and refreshing feeling of use unique to the gel composition using a carboxyvinyl polymer was not impaired at all, and was excellent. It was a feeling of use.
On the other hand, the gel compositions of the compositions of Comparative Examples 1 to 15 show a remarkable decrease in viscosity due to light irradiation, a viscosity retention rate after light irradiation of less than 55%, and a viscosity decrease suppression effect (thickness suppression effect) of x. evaluated. In the organoleptic evaluation tests, the gel compositions of Comparative Examples 1 to 15 which did not take the constitution of the present invention were all identified at a level at which the decrease in viscosity due to light irradiation was clearly recognized by the organoleptic test.
As shown in Comparative Examples 3 to 9, citric acid alone (Comparative Examples 3 and 4) does not necessarily have a higher viscosity-reducing effect than other organic acids (Comparative Examples 5 to 9). Further, as shown in Comparative Example 10, the effect of suppressing the viscosity reduction was low even with isomalt alone. In addition, as shown in Comparative Examples 11 to 15, when phytic acid, lactic acid, sodium gluconate, adenosine triphosphate and isomalt were combined, the effect of suppressing viscosity reduction was low. From these results, it has been found that only when citric acid and / or citrate is combined with isomalt, a remarkable remarkable viscosity-reducing effect is exhibited.
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, the feeling of use gives a fresh and refreshing feeling only when applied to the skin with a carboxyvinyl polymer, and was found to be optimal for cosmetics.

Claims (3)

A gel composition containing the following (A) to (C).
(A) carboxyvinyl polymer (B) citric acid and / or its salt (C) isomalt   The gel composition according to claim 1, wherein the content of (B) citric acid and / or a salt thereof is 0.001 to 0.03% by mass as citric acid per gel composition.   3. The gel composition according to claim 1, which is used for cosmetics.

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