JP2000302662A - Capsule-containing gel cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a capsule-containing gel cosmetic having tendency to be easily broken with slight shear to release encapsulated ingredients by dispersing in a specific water-soluble gel specific capsules in which a cosmetic ingredient is encapsulated or to which it is impregnated. SOLUTION: This cosmetic is prepared by encapsulating or impregnating (A) capsules made of agar and a polyvalent metal alginate with (B) a cosmetic ingredient (preferably an oily ingredient) and then by dispersing the capsules in (C) water-soluble gel comprising sodium hydroxide and a 3-6C dihydric alcohol, The ingredient A may be added with at least one kind of starch-acrylamide- acrylate copolymers as a capsule-forming ingredient. The content of sodium hydroxide is preferably 0.01-1.00 wt.% based on the weight of the ingredient C. Consequently, capsules easily breakable with slight shear can be stably dispersed in the water-soluble gel and the objective cosmetics where fragments of capsule membrane do not remain when broken can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a capsule which is easily disintegrated by slight shearing and is dispersed in a water-soluble gel, so that the capsule can be easily applied to the skin or discharged from a pump container. The present invention relates to a capsule-containing gel cosmetic capable of disintegrating into a capsule and releasing an encapsulated component. More specifically, agar, a polyvalent metal salt of alginic acid, or one of starch-acrylamide-acrylate copolymers
The cosmetic component is encapsulated or impregnated in the capsule formed by the seed or two or more kinds, and sodium hydroxide and C3 to C3 are contained.
The present invention relates to a capsule-containing gel cosmetic which is dispersed in a water-soluble gel containing a dihydric alcohol of No. 6.

[0002]

2. Description of the Related Art A technique of dispersing and blending a hydrophobic substance such as an oily component with a polymer compound in a liquid or gel aqueous phase has been used for a long time. At that time, as a polymer compound forming a capsule, one having low skin irritation has been demanded. Alginic acid is a polysaccharide obtained from seaweed, and is crosslinked by a polyvalent metal such as calcium to form a gel.
No. 139108) and microcapsules enclosing a hydrophobic substance with calcium alginate (Japanese Patent Application Laid-Open No.
238139) has been proposed.

[0003] However, capsules made of polyvalent metal salts of alginic acid are inferior in disintegration properties. When a cosmetic prepared by dispersing the same is applied to the skin, the encapsulated cosmetic components are not sufficiently released and their effects are lost. Not only could it not be exerted, but it also caused irritation to the skin.
Further, in the case of a preparation form which is discharged by a pump container, undisintegrated capsules and large capsule membrane debris remain upon discharging, which causes clogging of the pump. On the other hand, when the strength of the capsule membrane is reduced to improve the disintegration of the capsule, there is a problem that the capsule is disintegrated when dispersed in the aqueous phase, or it is difficult to maintain a stable dispersion state of the capsule. .

[0004]

Therefore, in the present invention, it is possible to stably disperse capsules which easily disintegrate due to slight shearing in a water-soluble gel, apply them to the skin, or discharge them with a pump container. Capsule-containing gel-type cosmetics that can easily disintegrate capsules upon release and release encapsulated components, do not irritate the skin, or leave no capsule membrane debris that can cause clogging of the pump The purpose was to.

[0005]

In order to solve the above-mentioned problems, various studies have been made to find that agar, a polyvalent metal salt of alginic acid, or one or more starch-acrylamide-acrylate copolymers are used. It is found that good results can be obtained by encapsulating or impregnating the cosmetic component in the formed capsule and dispersing it in a water-soluble gel containing sodium hydroxide and a dihydric alcohol having 3 to 6 carbon atoms, The present invention has been achieved.

That is, the capsule-containing gel cosmetic according to the present invention comprises a capsule formed of agar and a polyvalent metal salt of alginic acid, in which a cosmetic component is encapsulated or impregnated. It is dispersed in a water-soluble gel containing a polyhydric alcohol. One or more of starch-acrylamide-acrylate copolymers may be further added as a capsule film forming component.

[0007]

DETAILED DESCRIPTION OF THE INVENTION In the present invention, capsules are formed from a polyvalent metal salt of alginic acid and agar. Examples of polyvalent metal salts of alginic acid include alkaline earth metal salts other than magnesium, such as calcium salts, strontium salts, and barium salts, zinc salts, and aluminum salts. These can be obtained by adding a chloride of the above-mentioned polyvalent metal such as calcium chloride to sodium alginate (molecular weight: about 10,000 to 200,000) which is commercially available as a raw material for cosmetics. In the present invention, one or more selected from the polyvalent metal salts of alginic acid are used.

As the agar used as the capsule film forming component in the present invention, those commercially available as raw materials for cosmetics having a molecular weight of about 10,000 to 200,000 can be used. The content of the polyvalent metal salt of alginic acid and the content of agar in the capsule membrane is suitably 0.01 to 10.0% by weight, respectively, and the weight ratio of the former to the latter is:
It is preferred to be in the range of 0.5 to 2.0.

Further, in the present invention, one or more starch-acrylamide-acrylate copolymers can be added as a capsule film-forming component. The copolymer is obtained by graft copolymerizing starch with acrylamide and an acrylate such as sodium acrylate and aluminum acrylate.
R-LOCK D-223 "commercially available corn starch / acrylamide / sodium acrylate copolymer can be used. As the blending amount of one or more of the above copolymers in the capsule membrane,
It is preferable that the content be about 0.01 to 5.0% by weight. In preparing the capsule membrane used in the present invention, powder such as mica, sericite, and titanium oxide may be added.

In the present invention, cosmetics are added to a capsule formed by adding one or more of a polyvalent metal salt of alginate and agar as described above, or a starch / acrylamide / acrylate copolymer as described above. Include ingredients. In addition, a capsule made of porous particles by the above-mentioned components,
A cosmetic ingredient may be impregnated. As the cosmetic component to be included or impregnated, it is preferable to use hydrophobic substances such as oils for cosmetics, oil-soluble vitamins such as vitamin E, vitamin A and derivatives thereof, and oil-soluble ultraviolet absorbers. The encapsulation or impregnation of the cosmetic component into the capsule can be performed by a general method such as a method of encapsulating a cured film in liquid.
In the present invention, the capsule has a particle size of 0.5 mm or more.
It is appropriate that the size be about 3.0 mm.

Subsequently, in the present invention, the capsule prepared as described above is dispersed in a water-soluble gel. Such a water-soluble gel contains one or more of sodium hydroxide and a dihydric alcohol having 3 to 6 carbon atoms. The amount of sodium hydroxide in the water-soluble gel is
It is preferably 0.01 to 1.0% by weight. Examples of the dihydric alcohol having 3 to 6 carbon atoms include 1,2-propanediol, 1,3-butanediol, 1,2-pentanediol,
Examples thereof include 1,2-hexanediol and the like, and one or more kinds are selected from these and used. Of these, especially 1,3-
Butanediol is preferably used. The amount of the dihydric alcohol having 3 to 6 carbon atoms to be added to one or more water-soluble gels is preferably 5.0 to 30.0% by weight.

In the present invention, the water-soluble gel used as the dispersion medium of the capsule can be obtained by adding a water-soluble polymer having a viscosity increasing. Examples of such water-soluble polymers include plant polysaccharides such as guar gum and locust bean gum, microbial polysaccharides such as xanthan gum and curdlan, cellulosic semisynthetic polymers such as hydroxyethylcellulose and hydroxypropylcellulose, carboxymethyl starch, Examples include starch-based semi-synthetic polymers such as methyl starch, and vinyl-based synthetic polymers such as carboxyvinyl polymer and polyacrylic acid. One or more of these are selected and used. Among them, acrylic acid polymers such as carboxyvinyl polymer, polyacrylic acid, acrylic acid / methacrylic acid ester copolymer and the like, which are thickened by neutralization with sodium hydroxide, can be preferably used.

The above water-soluble gel has a carbon number of 3 such as lower alcohols such as ethanol, polyethylene glycol and glycerin as long as the characteristics of the present invention are not impaired.
Polyhydric alcohols other than dihydric alcohols, bases other than sodium hydroxide such as potassium hydroxide, L-arginine and L-lysine, surfactants, humectants such as hyaluronic acid and lactic acid, riboflavin, L -Water-soluble vitamins such as ascorbic acid, UV absorbers, fungicides, fungi, pigments, plants,
Additives for cosmetics, such as extracts of animal tissues, yeasts, etc., and fragrances can be added.

According to the present invention, when the capsule is dispersed in a water-soluble gel, the disintegration of the capsule is suppressed and a stable dispersion state is maintained. The membrane softens and the capsule disintegrates easily upon application of slight shear by application to the skin or filling and discharging into a pump container. At this time, the capsule membrane is finely disintegrated, and no remaining film fragments are visually observed.

[0015]

EXAMPLES Further, the features of the present invention will be described in detail with reference to examples.

First, the compositions of the capsules used in the examples according to the present invention and comparative examples are shown in Table 1. These capsules were prepared as follows. Sodium alginate, which produces calcium alginate at the concentration shown in column A in Table 1, is dissolved in purified water together with other film-forming polymers when they are used, and dispersed in the above-mentioned aqueous solution when powder is contained, to form a film. This is a substance solution. The core substance shown in column B is added to and dispersed in the coating substance solution, and the resultant is dropped into a calcium chloride aqueous solution through a nozzle, and the resulting capsule is collected.

[0017]

[Table 1]

Next, the compositions of the water-soluble gels used in Examples and Comparative Examples of the present invention are shown in Table 2. In Table 2, the aqueous solution of the water-soluble polymer in column A was added to purified water, and the components obtained by mixing and dissolving the components in columns B, C, and D were added and mixed sequentially, and then the base in column E was added. To increase the viscosity.

[0019]

[Table 2]

In Examples of the present invention and Comparative Examples, as shown in Tables 3 and 4, 4.0% by weight of capsules shown in Table 1 were replaced by 96.0% by weight of water-soluble gel shown in Table 2.
And disperse it.

[0021]

[Table 3]

[0022]

[Table 4]

With respect to the above Examples and Comparative Examples of the present invention, the dispersion stability of the capsules at the time of preparation and the disintegration of the capsules when discharged by a pump container were observed, and a use test was conducted by a female panelist. Regarding the dispersion stability of the capsule during preparation, add the capsule to the water-soluble gel,
By observing the disintegration of the capsule when dispersed, it was determined that "○; no disintegration of the capsule was observed", "△; some disintegrated capsule was observed", "X: disintegration of the capsule was noticeably observed" expressed. Regarding the disintegration of the capsule when discharged by a pump container, add and disperse the capsule in the water-soluble gel, and then leave it for 3 days, fill it into the pump container and discharge it. By observing whether or not, the results were expressed as “○; disintegrates well”, “△; capsules that do not completely disintegrate remain”, and “X: almost no disintegration is observed”.

The use test by a female panelist
A group of 20 female panelists aged from 50 to 50 years old, when capsules were added to and dispersed in a water-soluble gel and allowed to stand for 3 days, the capsules were not disintegrated and were stably retained without any collapse. For each example, each group was applied to the skin through a blind, and the capsules were sensory-evaluated for ease of crushing, moist feeling, and irritability at the time of application. Table 5 for sensory evaluation
The evaluation was made according to the evaluation criteria shown in the above, and scored, and the average value of 20 persons was obtained.

[0025]

[Table 5]

Table 6 shows the observation results of the dispersion stability of the capsule and the disintegration property at the time of ejection, and Table 7 shows the results of the use test.

[0027]

[Table 6]

[0028]

[Table 7]

Table 6 shows that, in all of the examples of the present invention, good dispersion stability was observed at the time of preparation, and that capsules were easily disintegrated by discharging from a pump. On the other hand, the capsules dispersed in the water-soluble gel in Examples of the present invention, Comparative Examples 1, 2, and 3 were dispersed in a water-soluble gel containing sodium hydroxide but not containing 1,3-butanediol. In Comparative Example 7, Comparative Example 8, Comparative Example 13, Comparative Example 14, Comparative Example 19, and Comparative Example 20, disintegration of the capsule was observed at the time of preparation, and the product had no product value. Comparative Examples 3 to 6, in which capsules were dispersed in a water-soluble gel containing no sodium hydroxide.
In Comparative Examples 9 to 12, Comparative Examples 15 to 18, and Comparative Examples 21 to 24, it was recognized that the capsules did not collapse sufficiently when discharged from the pump container.

Further, as shown in Table 7, in each of the groups using the examples of the present invention, the ease of crushing of the capsules was highly evaluated, and a good moist feeling was obtained. Not allowed. In contrast, Comparative Examples 3 to 6, Comparative Examples 9 to 12, Comparative Examples 15 to 18, and Comparative Examples 21 to 24 in which capsules were dispersed in a water-soluble gel containing no sodium hydroxide. In each of the use groups, the evaluation of the crushability of the capsule was poor, and the evaluation of the moist feeling was low. Further, in the group using Comparative Example 25 to Comparative Example 28 using capsules containing neither agar nor corn starch / acrylamide / sodium acrylate copolymer as a film-forming component, a considerable irritating feeling was observed when applied to the skin. Admitted.

[0031]

As described above in detail, according to the present invention, a capsule which is easily disintegrated by a slight shear can be stably dispersed in a water-soluble gel, and can be applied to the skin,
Capsules containing no capsule film debris that can easily disintegrate and release encapsulated components when discharged in a pump container, causing irritation to the skin and causing clogging of the pump It was possible to provide a gel cosmetic.

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Claims (5)

[Claims] 1. A capsule formed of agar and a polyvalent metal salt of alginic acid, in which a cosmetic component is encapsulated or impregnated, and dispersed in a water-soluble gel containing sodium hydroxide and a dihydric alcohol having 3 to 6 carbon atoms. A capsule-containing gel cosmetic comprising: 2. A capsule formed of one or more of agar, a polyvalent metal salt of alginic acid, and a starch / acrylamide / acrylate copolymer, containing or impregnating a cosmetic component with sodium hydroxide and sodium hydroxide. A capsule-containing gel cosmetic which is dispersed in a water-soluble gel containing a dihydric alcohol having 3 to 6 carbon atoms. 3. The capsule-containing gel cosmetic according to claim 1, wherein the cosmetic component is an oily component. 4. The capsule-containing gel according to claim 1, wherein the content of sodium hydroxide is 0.01 to 1.00% by weight based on the weight of the water-soluble gel. Cosmetics. 5. The capsule-containing gel cosmetic according to claim 1, wherein the water-soluble gel contains one or more selected from acrylic acid-based polymers. Fees.