JP2013014532A - Foamable skin external preparation of preparing two or more agents before use - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an excellent skin external preparation which is well balanced with respect to most of the evaluation attributes (which may not necessarily be all) such as foamability, an irritating feeling, foam durability, liquid dripping, extensibility, elasticity, viscosity, and flexibility.SOLUTION: The foamable skin external preparation of preparing two or more agents before use includes a particulate substance containing a water soluble acid and a viscous composition containing a carbonate, water and a thickening agent, and this viscous composition includes lambda-carrageenan, iota-carrageenan, and xanthan gum as thickening agents and does not include at least kappa-carrageenan.

Description

  TECHNICAL FIELD The present invention relates to a foamable skin external preparation of the type in which two or more preparations are prepared at the time of use.

  In recent years, effervescent cosmetics are becoming popular among women. For example, Patent Document 1 discloses a first agent composed of sodium hydrogencarbonate, ammonium hydrogencarbonate, etc., a second agent composed of calcium sulfate, citric acid, ascorbic acid, tartaric acid, etc., and an additive composed of skim milk powder, starch, and the like. When water is added, the first agent and the second agent react to generate carbon dioxide, and the change from the generation of bubbles of the carbon dioxide gas to expansion, rupture, extinction can be used for massage etc. It has been described.

Japanese Patent Laid-Open No. 04-217609

  However, the prior art described in the above literature has room for improvement in the following points.

  That is, in the technique of Patent Document 1, when used in a skin external preparation such as a pack cosmetic, most of foaming power, irritation, foam persistence, dripping, extensibility, elasticity, stickiness, flexibility, etc. It is difficult to obtain a skin external preparation with an excellent balance in evaluation items (hereinafter referred to as “main evaluation items”) (not necessarily all). In particular, in the technique of Patent Document 1, the foaming property when used in a skin external preparation such as a pack cosmetic lasts only for a few minutes to a few minutes, so there is room for further improvement in order to obtain a sufficient massage effect. It was.

  This invention is made | formed in view of the said situation, and it aims at providing the skin external preparation excellent in balance in this evaluation item (it is not necessarily all).

  (1) According to the present invention, a foamable skin external preparation of the type that is prepared at the time of use of two or more agents, a granular material (first agent) containing a water-soluble acid, carbonate, water and a thickener A viscous composition (second agent) containing, and the viscous composition contains lambda carrageenan, iota carrageenan, and xanthan gum as the thickener, and does not contain at least copper carrageenan. An external skin preparation is provided.

  (2) In the foamable skin external preparation described in (1), the viscous composition contains 0.5 to 3.0% by mass of the lambda carrageenan, 0.3 to 2.0% by mass of iota carrageenan, and xanthan gum. It is preferable to contain 0.3-2.0 mass%.

  (3) In the foamable skin external preparation described in (1) or (2), the viscosity of the viscous composition at a shear rate of 50 rpm in a Brookfield viscometer is 3,000 to 30,000 mPa · s (25 The viscosity at a shear rate of 0.5 rpm in the Brookfield viscometer of the viscous composition is preferably 100,000 to 1,000,000 mPa · s (25 ° C.).

  (4) In the foamable skin external preparation described in any one of (1) to (3), it is preferable that the granular material further includes a water-soluble dispersant and does not include a thickener.

  According to the present invention, a skin external preparation excellent in balance in this evaluation item (not necessarily all) can be obtained.

  Embodiments of the present invention will be described below. Note that description of similar components will be omitted as appropriate. Moreover, in the following description, A-B shall mean A or more and B or less.

<External preparation for skin>
The foamable skin external preparation of this embodiment is a type of foamable skin external preparation prepared at the time of use of two or more agents. This effervescent skin external preparation contains the granular material containing a water-soluble acid, and the viscous composition containing carbonate, water, and a thickener. Moreover, this viscous composition contains lambda carrageenan, iota carrageenan, and xanthan gum as a thickener, and does not contain at least copper carrageenan.

  According to this composition, lambda carrageenan, iota carrageenan, and xanthan gum are included as thickeners, and at least copper carrageenan is not included. Therefore, as shown in the examples described later, the viscosity having a viscosity in an appropriate range. A composition is obtained. And, by combining this viscous composition and a granular material containing a water-soluble acid, as shown in the examples described later, a skin external preparation excellent in balance in this evaluation item (not necessarily all). Is obtained.

  The skin external preparation according to this embodiment can be used for cosmetics, quasi drugs, and pharmaceuticals. Examples of the dosage form include cosmetics such as packs, hair preparations, cleaning agents, and baths. Examples thereof include agents and drugs that are applied to the skin. However, when taking any form, it is the same in the point that it is used as a foaming skin external preparation of the type that is prepared at the time of using two or more agents including a granular material and a viscous composition.

  That is, the external preparation for skin according to this embodiment may be stored in a state where the granular material and the viscous composition are not in contact with each other, and both are preferably stored in a sealed state. The storage container can be used without any particular restrictions such as material, shape and structure. Examples of the material include plastic, glass, aluminum, paper, various polymers and composites of these materials, and the shape and structure are cups. Tube, bag, bottle, stick, pump, any of which can be used without limitation. Among these, in particular for granular materials, aluminum sticks or aluminum bags laminated with polyethylene terephthalate on the inner surface, for viscous compositions, aluminum sticks or aluminum bags laminated with polyethylene terephthalate on the inner surface, or aluminum with inner surfaces laminated with polyethylene terephthalate A cup made of polyethylene terephthalate, in which the lid is heel-sheeted with a sheet, is preferable from the viewpoints of hermeticity, storage stability of contents, production cost, and the like.

  In the external preparation for skin according to the present embodiment, the mixing of the granular material and the viscous composition may be performed using a suitable container such as glass or plastic, or may be performed on the palm or skin. good. In any case, it is preferable to mix lightly so that the granular material does not disappear. Mixing of the granular material and the viscous composition may be performed with fingers or the like, or a tool such as a spatula or a spatula may be used.

  In addition, since the external preparation for skin according to this embodiment is preferably left for 20 to 30 minutes after being applied to the skin or the like, the external preparation for skin is particularly useful when used at home instead of a salon or the like. Even if it is applied to the skin, it is desirable that the external preparation for skin does not sag and remains on the skin or the like even if a simple daily operation such as walking or cleaning is performed. In addition, the time to leave after applying to skin etc. is not limited to 20 to 30 minutes.

  Moreover, it is preferable that the skin external preparation which concerns on this embodiment is 5-40 mass parts of viscous compositions with respect to 1 mass part of granular materials, More preferably, it is 10-35 mass parts, More preferably, it is 15-20 masses. Part. When the viscous composition is 5 parts by mass or less with respect to 1 part by mass of the granular material, when the carbon dioxide external preparation is prepared by mixing both, foaming is fast and the foaming sustainability is not sufficient. Further, as a result of intense generation of carbon dioxide bubbles, the external preparation for skin is easily peeled off from the skin or the like. And, since the reaction between the granular material and the viscous composition is fast and a lot of carbon dioxide tends to diverge into the outside air in a short time, the carbon dioxide is not sufficiently foamed when applied to the skin etc. Or it is difficult to obtain a medical effect. When the viscous composition is 40 parts by mass or more with respect to 1 part by weight of the granular material, when the granular material is mixed with the viscous composition, unevenness is likely to occur, and it is not only difficult for consumers to use, but also a sufficient effect is obtained. Absent.

<Granular material>
It is desirable that the granular material used for the foamable skin external preparation of the present embodiment has a predetermined size. This is because in the case of fine powder, when the granular material and the viscous composition are mixed, a so-called lumpy mass tends to be formed, which becomes non-uniform. As a result of the non-uniformity, the foamed part is too foamed, and the part where the powdery material has not spread is hardly foamed at all, which is not only difficult for consumers to use but also has a sufficient effect. Absent. Moreover, the granular material is not limited as long as it contains a water-soluble acid. That is, in general, the shape of the granular material varies depending on the method for producing the granular material, and may be irregular, flat, polyhedral, spherical, drips, fibrous, cylindrical, etc. . In any case, since the shape of the granular material greatly affects the bulk density, fluidity, and moldability, it is preferable to select and use an appropriately shaped granular material.

  Moreover, this granular material does not limit the fineness and fineness distribution. That is, in general, the smallest independent unit that cannot be further divided in a granular material is a single granular material, but the actual granular material is usually an aggregated granular material (secondary granular material). There are many. In addition, the ratio for which the granular material of a different magnitude | size occupies the whole among granular materials is called "particle size distribution." In any case, the granular material preferably has an appropriate particle size and particle size distribution. That is, the mesh size of the granular material is preferably within a predetermined range.

  Further, the water-soluble acid contained in the granular material is not particularly limited. For example, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, fumaric acid, maleic acid, phthalic acid, Isophthalic acid, terephthalic acid, glutamic acid, aspartic acid, glycolic acid, malic acid, tartaric acid, itatartaric acid, citric acid, isocitric acid, lactic acid, hydroxyacrylic acid, α-oxybutyric acid, glyceric acid, tartronic acid, salicylic acid, gallic acid, Tropaic acid, ascorbic acid, gluconic acid, phosphoric acid, potassium dihydrogen phosphate, sodium dihydrogen phosphate, sodium sulfite, potassium sulfite, sodium pyrosulfite, potassium pyrosulfite, acidic sodium hexametaphosphate, acidic potassium hexametaphosphate, acidic pyrolin Acid sodium, potassium acid pyrophosphate Beam, such as sulfamic acid can be preferably used. In addition, only 1 type of these may be used, and 2 or more types may be mixed and used.

  Among these water-soluble acids, it is preferable to use a mixture of citric acid and ascorbic acid in order to achieve a particularly good feeling of irritation. This is because from the consumer's point of view, it is difficult to obtain satisfaction if the stimulus is too strong or too weak. Specifically, in the case of only ascorbic acid, the feeling of irritation is too weak and it seems unsatisfactory for consumers. In addition, in the case of citric acid alone, the sense of irritation is too strong and the consumer may feel uncomfortable. In addition, about the mixing ratio of a citric acid and ascorbic acid, it is preferable to adjust suitably according to a consumer's liking.

  The particulates preferably further include a water-soluble dispersant in order to facilitate the water-soluble acid to react successfully with the carbonate in the viscous composition. In general, a water-soluble acid also functions as a water-soluble dispersant, but this water-soluble dispersant is added as a component separate from the water-soluble acid. That is, the water-soluble dispersant contained in the granular material is not particularly limited, and for example, lactose, sucrose (main component is sucrose), D-mannitol, fructose, urea and the like can be suitably used. . In addition, only 1 type of these may be used, and 2 or more types may be mixed and used. Among these water-soluble dispersants, it is preferable to use lactose in order to achieve particularly good foaming power. In addition, it is preferable to adjust suitably the mixing ratio of a water-soluble acid and a water-soluble dispersing agent according to the strength of the target foaming power.

  Moreover, it is preferable that this granular material does not contain a thickener contrary to the usual technical common sense at the time of manufacturing a granular material. The inclusion of a thickener is easier to granulate, but on the other hand, the binding force of the granular material is too strong, so when reacting the granular material with a viscous composition, it is better not to include the thickener. This is because the dispersibility of the granular material in the composition is good. However, this is not intended to exclude the addition of a thickener to the granular material, and when a thickener is added, the content is preferably adjusted as appropriate according to various target properties.

<Viscous composition>
The viscous composition used for the effervescent skin external preparation of this embodiment should just contain carbonate, water, and a thickener, and is not limited about a shape. That is, generally, the shape of the viscous composition varies depending on the composition of the viscous composition, and can take a gel shape, a gel shape, a slurry shape, or the like. However, among these, it is particularly preferable to use a gel-like viscous composition because of excellent use feeling when used as a skin external preparation.

  The carbonate contained in the viscous composition is not particularly limited, and any carbonate that reacts with a water-soluble acid to generate carbon dioxide can be suitably used. For example, ammonium carbonate, ammonium bicarbonate, potassium carbonate, potassium bicarbonate, potassium sesquicarbonate, sodium carbonate, sodium bicarbonate, sodium sesquicarbonate, lithium carbonate, lithium bicarbonate, lithium sesquicarbonate, cesium carbonate, cesium bicarbonate, sesquicarbonate Cesium carbonate, magnesium carbonate, magnesium hydrogen carbonate, calcium hydrogen carbonate, calcium carbonate, magnesium carbonate hydroxide, barium carbonate and the like can be suitably used. In addition, only 1 type of these may be used, and 2 or more types may be mixed and used. Of these carbonates, sodium hydrogen carbonate is preferably used in order to achieve particularly good foaming power.

  In addition, about the content rate of sodium hydrogencarbonate, it is preferable to adjust suitably according to the intensity | strength of the target foaming power, etc. Specifically, the blending amount of the carbonate is preferably 0.1 to 10% by mass, more preferably 0.5 to 6% by mass, and further preferably 2 to 4% by mass with respect to the entire viscous composition. is there. When the blending amount of the carbonate is 0.1% by mass or less, no matter how much the acid reacting therewith, the amount of generated carbon dioxide is small, so that no beauty or medical effect can be obtained. If the amount of carbonate is 10% by mass or more, it exceeds the saturation solubility, and thus precipitates and impairs the appearance of the product.

  The water contained in this viscous composition is not particularly limited, and is not particularly limited as long as it can be used for the production of ordinary cosmetics and pharmaceuticals, and distilled water, membrane filtered water, ion-exchanged water, etc. are appropriately used. it can. The blending amount of water is preferably 50 to 90% by mass, more preferably 55 to 85% by mass, and still more preferably 60 to 80% by mass with respect to the entire viscous composition. When the blending amount of water is 50% by mass or less, the viscosity of the viscous composition is too high and lacks fluidity, flexibility, etc., making it difficult to mix granular materials and difficult to apply to the skin and the like. . In addition, as a result of the fact that the granular material does not spread evenly in the viscous composition, a sufficient cosmetic or medical effect cannot be obtained for the entire application part on the skin or the like. When the blending amount of water is 90% by mass or more, when the granular material is mixed with the viscous composition, the water-soluble acid dissolves too early and carbon dioxide is rapidly generated, which is emitted into the outside air, and is applied to the skin. At the time of application, the carbon dioxide content in the prepared external preparation for carbon dioxide decreases, so that sufficient cosmetic or medical effects cannot be obtained. Moreover, since the carbon dioxide external preparation drips when applied to the skin or the like, the usability is also poor.

  The thickening agent contained in the viscous composition includes lambda carrageenan, iota carrageenan, and xanthan gum, and at least does not include copper carrageenan. Of these, lambda carrageenan is related to stickiness (stickiness), and iota carrageenan and xanthan gum are related to elasticity (pull-pull feeling). On the other hand, when kappa carrageenan is added, the viscous composition becomes solid and cannot be applied as a skin external preparation.

  Here, carrageenan is a kind of linear sulfur-containing polysaccharide, and includes an anionic polymer compound composed of D-galactose (or 3,6-anhydro-D-galactose) and sulfuric acid. Carrageenan is also called carrageenan, carrageenan, carrageenan, carrageenin.

There are three types of carrageenan:
κ (kappa): There is a tendency to make a hard and strong gel. Obtained from Kappaphycus cottonii.
ι: I tend to make soft gels. It is obtained from Eucheuma spinosum.
λ (Lambda): Does not gel with water, but tends to make a soft gel when mixed with protein. A commonly used raw material is Gigartina from the Southern Europe.

  Xanthan gum is a kind of polysaccharide and includes a polymer compound composed of repeating units of glucose 2 molecules, mannose 2 molecules, and glucuronic acid. It is often made by fermenting starch such as corn with bacteria (Xanthomonas campestris). The molecular weight is often about 2 million or about 13 million to 50 million.

  The content of lambda carrageenan in the viscous composition is preferably 0.5 to 3.0% by mass. If the content rate of lambda carrageenan is within this range, an excellent skin external preparation can be obtained in a well-balanced manner in this evaluation item (not necessarily all), as shown in Examples described later. In addition, even if the content rate of this lambda carrageenan exists in the range of the arbitrary two numerical values chosen from 0.5, 1.0, 1.5, 2.0, 2.5, and 3.0 mass%. good.

  Moreover, it is preferable that the content rate of the iota carrageenan in this viscous composition is 0.3-2.0 mass%. If the content of iota carrageenan is within this range, an external preparation for skin having a good balance in this evaluation item (not necessarily all) can be obtained as shown in Examples described later. The content of iota carrageenan is within the range of any two values selected from 0.3, 0.6, 0.9, 1.2, 1.5, 1.8, and 2.0% by mass. It may be.

  Moreover, it is preferable that the content rate of the xanthan gum in this viscous composition is 0.3-2.0 mass%. If the content of xanthan gum is within this range, an excellent skin external preparation can be obtained in a well-balanced manner in this evaluation item (not necessarily all) as shown in Examples described later. In addition, the content rate of this xanthan gum is within the range of two arbitrary numerical values selected from 0.3, 0.6, 0.9, 1.2, 1.5, 1.8, and 2.0% by mass. There may be.

  Moreover, as a thickener contained in this viscous composition, you may mix other thickeners besides lambda carrageenan, iota carrageenan, xanthan gum, and these. Examples of other thickeners include alginic acid polymers, cellulose polymers, and synthetic polymers. Sodium alginate, propylene glycol alginate, carboxymethylcellulose and salts thereof, carboxymethyl starch and salts thereof, and carboxyvinyl polymer. Polyvinylpyrrolidone is more preferable from the viewpoint of usability and the like, and sodium alginate, propylene glycol alginate and sodium carboxymethylcellulose are more preferable from the viewpoint of usability. However, as already explained, the thickener contained in this viscous composition does not contain at least copper carrageenan.

  The viscosity of the viscous composition at a shear rate of 50 rpm (high shear rate) in a Brookfield viscometer is preferably 3,000 to 30,000 mPa · s (25 ° C.). When this viscous composition contains 0.5 to 3.0% by mass of lambda carrageenan, 0.3 to 2.0% by mass of iota carrageenan and 0.3 to 2.0% by mass of xanthan gum, it will be described later. As shown in the examples, the viscosity at this high shear rate falls within this range. If the viscosity at this high shear rate is within this range, an excellent skin external preparation can be obtained in a well-balanced manner in this evaluation item (not necessarily all) as shown in Examples described later. The viscosity at the high shear rate here is an arbitrary value selected from 3,000, 5,000, 10,000, 15,000, 20,000, 25,000, 30,000 mPa · s (25 ° C.). It may be within the range of two numerical values.

  The viscosity of the viscous composition at a shear rate of 0.5 rpm (low shear rate) in a Brookfield viscometer is preferably 100,000 to 1,000,000 mPa · s (25 ° C.). When this viscous composition contains 0.5 to 3.0% by mass of lambda carrageenan, 0.3 to 2.0% by mass of iota carrageenan and 0.3 to 2.0% by mass of xanthan gum, it will be described later. As shown in the examples, the viscosity at this low shear rate falls within this range. If the viscosity at this low shear rate is within this range, an excellent skin external preparation can be obtained in a well-balanced manner in this evaluation item (not necessarily all), as shown in the examples described later. In addition, the viscosity at this low shear rate is 100,000, 200,000, 300,000, 400,000, 500,000, 600,000, 700,000, 800,000, 900,000, 1, It may be within a range of any two numerical values selected from 000,000 mPa · s (25 ° C.).

  Here, the viscous composition contained in the foamable external preparation for skin according to the present embodiment is a component used for cosmetics and the like within the range not impairing the effect of the viscous composition, fats and oils, waxes, hydrocarbons , Fatty acids, alcohols, esters, surfactants, metal soaps, pH adjusters, preservatives, fragrances, moisturizers, powders, UV absorbers, dyes, antioxidants, chelating agents, bark compositions, etc. These components can be blended. Further, pine bark extract, ice plant extract, soybean extract, potato extract, kuzu flower extract, sweet potato young leaf powder, and onion powder may be added.

  As mentioned above, although embodiment of this invention was described, these are illustrations of this invention and various structures other than the above are also employable.

  For example, in the above embodiment, the foamable skin external preparation of the type prepared at the time of use is mainly composed of a granular material containing a water-soluble acid and a viscous composition containing carbonate, water and a thickener. However, the present invention is not limited to two agents. For example, it may be an effervescent skin external preparation of the type prepared at the time of use of three or more agents. Even in this case, the third agent must not interfere with foaming when preparing two agents consisting of a granular material containing a water-soluble acid and a viscous composition containing carbonate, water and a thickener. Similarly, an external preparation for skin having a good balance in this evaluation item (not necessarily all) can be obtained.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further, this invention is not limited to these.

<Evaluation items>
About the sample of the Example and comparative example which are mentioned later, about the following evaluation items, it determined by the criteria shown in Table 1. The viscosity was measured by a conventional method using a Brookfield viscometer.

In Table 1, the meanings of viscosity 1 and viscosity 2 are as follows.
Viscosity 1 [High shear rate (50 rpm)] ... Easy extension measurement When the viscosity 1 is more than 30,000 mPa · s, it is hard when applying the skin external preparation according to this embodiment to the skin or the like. It is difficult to extend. Moreover, when the viscosity 1 is less than 3,000 mPa · s, it is too soft and difficult to stretch.
Viscosity 2 [Low shear rate (0.5 rpm)] ... Measures the ease of dripping It should be noted that when the viscosity 2 exceeds 1,000,000 mPa · s, the skin external preparation according to this embodiment is applied to the skin or the like. At this time, it does not sag but becomes too heavy, resulting in non-uniformity during application. Further, when the viscosity 2 is less than 100,000 mPa · s, the external preparation for skin drips after application.

<Examples and comparative examples>
About the sample of the Example which consists of a composition shown in Table 2-Table 4 mentioned later, and a comparative example, about the said evaluation item, the result judged by the judgment standard shown in Table 1 is shown collectively in Table 2-Table 4. .

  Example 1 shows typical compositions for both the granular and viscous compositions. Example 2 shows a composition in which the granulate does not contain citric acid. Example 3 shows a composition in which the granular material does not contain ascorbic acid and contains a lot of citric acid. Example 4 shows a composition in which the viscous composition is rich in lambda carrageenan.

  Example 5 shows a composition where the viscous composition contains only a small amount of lambda carrageenan. Example 6 shows a composition in which the viscous composition is rich in iota carrageenan. Example 7 shows a composition where the viscous composition contains only low iota carrageenan. Example 8 shows a composition when the viscous composition contains a large amount of xanthan gum. Example 9 shows a composition where the viscous composition contains little xanthan gum.

  Comparative Example 1 shows a composition in which the viscous composition does not contain lambda carrageenan. Comparative Example 2 shows a composition in which the viscous composition does not contain iota carrageenan. Comparative Example 3 shows a composition in which the viscous composition does not contain xanthan gum. Comparative Example 4 shows a composition when the viscous composition contains copper carrageenan. Comparative Example 5 shows a composition when the viscous composition contains only copper carrageenan as a thickener.

<Consideration of results>
From the evaluation results of the above Examples and Comparative Examples, as a thickener, lambda carrageenan, iota carrageenan, and xanthan gum are included. It is clear that an excellent skin external preparation can be obtained in a well-balanced manner.

  When the viscous composition contains 0.5 to 3.0% by mass of lambda carrageenan, 0.3 to 2.0% by mass of iota carrageenan and 0.3 to 2.0% by mass of xanthan gum, It can be seen that a skin external preparation excellent in balance can be obtained in all the evaluation items of strength, foam persistence, dripping, extensibility, elasticity, stickiness, and flexibility. And in this case, it turns out that the skin external preparation excellent also in irritation | stimulation is obtained by mixing and using a citric acid and ascorbic acid as a water-soluble acid.

  On the other hand, when the viscosity 1 is too high and the viscosity 2 is too low, there is a demerit that foaming power, irritation, extensibility and flexibility are lowered, and elasticity and stickiness are excessive. On the other hand, when the viscosity 1 is too low and the viscosity 2 is too low, there is a demerit that foaming persistence, elasticity, and stickiness are lowered, dripping occurs, and foaming power and flexibility are excessive. On the other hand, when the viscosity 1 is too high and the viscosity 2 is too high, the foaming force and flexibility are lowered, and there is a demerit that the elasticity and stickiness are excessive.

  The evaluation result of this evaluation item does not depend only on the viscosity 1 and the viscosity 2. That is, in Example 7, the viscosity 1 is moderate, but when the viscosity 2 is too low, the elasticity decreases, dripping occurs, and the foaming force and flexibility are excessive. On the other hand, in Comparative Example 2, the viscosity 1 is moderate, but when the viscosity 2 is too low, foaming power, foaming sustainability, extensibility, and flexibility are lowered, dripping occurs, elasticity, and stickiness. There is a disadvantage that becomes excessive. In Comparative Example 3, viscosity 1 is moderate, but when viscosity 2 is too low, foaming power, extensibility, and flexibility are lowered, dripping occurs, and elasticity and stickiness are excessive. There is.

  Thus, the evaluation result of this evaluation item does not depend only on viscosity 1 and viscosity 2, but includes lambda carrageenan, iota carrageenan, and xanthan gum as a thickener, and at least copper carrageenan is included. If not, it should be noted that an excellent skin external preparation can be obtained in a well-balanced manner in this evaluation item (not necessarily all). It is clear that such a result cannot be easily conceived by those skilled in the art from the common general knowledge at the time of filing of the present application.

  In the above, this invention was demonstrated based on the Example. It is to be understood by those skilled in the art that this embodiment is merely an example, and that various modifications are possible and that such modifications are within the scope of the present invention.

  For example, in the above embodiment, lactose is used as the water-soluble dispersant, but other water-soluble dispersants may be used. In this case as well, it can be easily understood by those skilled in the art that a skin external preparation excellent in balance in this evaluation item (not necessarily all) can be obtained.

Claims (4)

It is a foaming skin external preparation of the type that is prepared at the time of using two or more agents,
A granular material containing a water-soluble acid (first agent);
A viscous composition (second agent) comprising carbonate, water and a thickener;
Including
The viscous composition as the thickener,
With lambda carrageenan,
With iota carrageenan,
Xanthan gum,
Including
At least does not include copper carrageenan,
Effervescent skin external preparation. In the foamable skin external preparation according to claim 1,
The viscous composition contains 0.5 to 3.0 mass% of the lambda carrageenan, 0.3 to 2.0 mass% of iota carrageenan, and 0.3 to 2.0 mass% of xanthan gum,
Effervescent skin external preparation. In the foamable skin external preparation according to claim 1 or 2,
The viscosity of the viscous composition at a shear rate of 50 rpm in a Brookfield viscometer is 3,000 to 30,000 mPa · s (25 ° C.),
The viscosity of the viscous composition at a shear rate of 0.5 rpm in a Brookfield viscometer is 100,000 to 1,000,000 mPa · s (25 ° C.).
Effervescent skin external preparation. In the foamable skin external preparation according to any one of claims 1 to 3,
The granular material is
Further comprising a water-soluble dispersant,
Does not contain thickener,
Effervescent skin external preparation.