JP5534988B2 - Granular bath agent composition - Google Patents

Description

  The present invention relates to a granular bath agent composition, and more particularly to a foamable granular bath agent composition.

  A bath agent containing a carbonate and an organic acid is widely known as an excellent bath agent because it generates bubbles of carbon dioxide gas in the bath water and the blood circulation promoting effect by the carbon dioxide gas is obtained. In such a bath preparation, as a means for increasing the concentration of carbon dioxide gas generated in the bath water, in order to dissolve the bath preparation in the vicinity of the bottom of the bathtub, the form is not granular but a relatively large tablet type. There are many cases.

  The granular foaming bath agent, which is another form of bath agent, does not require special manufacturing technology such as tableting, and generally has a short dissolution time, so it is used separately from the tablet type depending on the usage condition and preference. Various studies have been conducted. For example, a technique (Patent Document 1) has been reported in which an oily component is blended with a specific content for foaming properties and storage stability to form granules having a certain average particle size range.

  On the other hand, in order to prevent the loss of oil from the skin due to bathing and to prevent the skin from becoming bulky after bathing, it is common to add an oil component to the bath preparation. For example, a bath agent composition (Patent Document 2) that uses a carbon dioxide gas generation product and a specific oil component in combination in order to improve the feeling of warmth after bathing and having a good skin feel is known. A skin care method using a carbonated bath containing a specific fatty acid ester (Patent Document 3) is also known.

JP 2009-62319 A JP 2005-97238 A JP 2009-263311 A

However, conventional granular bath preparations cannot contain a large amount of oily components like liquid bath preparations, and their skin care effects still have room for investigation.
Accordingly, an object of the present invention is to provide a granular foaming bath agent that significantly maintains a moist feeling on the skin after bathing and exhibits an excellent skin care effect.

  Therefore, the present inventors conducted extensive studies to solve the above-mentioned problems. As a result, the organic acid was granulated together with a nonionic surfactant, a water-soluble binder, and a fatty acid ester having a specific ClogP value. Adjusts the content of dialkali metal carbonate and hydrogen carbonate, and if the granulated product and carbonate are used in combination, the bubbles of carbon dioxide generated in the bath water can be made extremely fine, The absorption and penetration of fatty acid ester into the skin is significantly promoted, and as a result, a granular bath composition having an excellent effect of maintaining a moist feeling compared to conventional granular bath preparations and tablet bath preparations can be obtained. As a result, the present invention has been completed.

That is, the present invention includes the following components (A) and (B):
(A) an organic acid, a granule containing a fatty acid ester having a molecular weight of 100 or more and a ClogP value of 4 to 18, a nonionic surfactant and a water-soluble binder, and (B) containing a dialkali metal carbonate, And the granular bath agent composition containing the carbonate containing 70 mass% or less of hydrogencarbonate is provided.

  If the granular bath preparation composition of the present invention is poured into bath water and bathed, a large amount of fine carbon dioxide bubbles are generated, so that not only an excellent warm feeling after bathing is obtained, but also fatty acid esters on the skin. Since the adsorption amount and the penetration amount are remarkably improved, overdrying after the bath can be suppressed, and as a result, an effect of maintaining a remarkably high moist feeling can be obtained.

  Component (A) contained in the granular bath agent composition of the present invention comprises (a1) an organic acid, (a2) a fatty acid ester having a molecular weight of 100 or more and a ClogP value of 4 to 18, and (a3) a nonionic surface activity. And (a4) a granulated product containing a water-soluble binder (hereinafter also referred to as granulated product (A)).

  The organic acid (a1) used in the present invention is preferably water-soluble and solid at room temperature (20 ° C.) from the viewpoints of solubility in bath water and handling during production and use. From the viewpoint of stably blending the fatty acid ester, which is an oily component, into the granulated product and promoting fine foaming to achieve a high moist feeling sustaining effect, an oil absorption capacity of 0.02 mL / g or more is preferable. More preferable is 0.05 mL / g or more. The oil absorption capacity is a value determined by the method described in Examples described later. The upper limit of oil absorption capacity is desirably 1.0 mL / g or less from the viewpoint of particle strength.

  As the organic acid, succinic acid, fumaric acid, malic acid, adipic acid, tartaric acid, benzoic acid, citric acid, pyrrolidone carboxylic acid, salicylic acid and the like are preferable. Fumaric acid is particularly preferable from the viewpoints of improving the fineness and foamability of the foam and achieving a high moist feeling sustaining effect, and ease of handling and economy. These organic acids can be used alone or in combination of two or more.

  40-95 mass% is preferable and, as for content of the organic acid in granulated material (A), 70-90 mass% is more preferable. Within this range, it is preferable because the fineness of foam and foamability are good, and an oily component containing a fatty acid ester is stably blended to obtain a high moist feeling sustaining effect. Moreover, the range within this range is preferable from the viewpoint of maintaining the shape retention of the granulated product.

The fatty acid ester (a2) having a molecular weight of 100 or more and a ClogP value of 4 to 18 used in the present invention controls the solubility of the granulated product (A) in the bath water, and makes the foam finer and foamable. In addition to acting effectively, the carbon dioxide gas generated in the bath water is distributed not only in the bath water but also in the fatty acid ester, thereby supplying a high concentration of carbon dioxide gas to the skin and enhancing the blood circulation promoting effect. Have. Furthermore, in the present invention, the fatty acid ester (a2) comes into contact with the skin together with fine carbon dioxide bubbles, so that the amount of adsorption and penetration into the skin is remarkably increased. Remarkably lasts and exhibits an excellent skin care effect.
Here, the ClogP value is. A. Leo Comprehensive Medicinal Chemistry, Vol. 4 C.I. Hansch, P.A. G. Sammens, J .; B Taylor and C.M. A. Ramsden, Eds. , P.M. 295, Pergamon Press, 1990, “calculated logP (ClogP)”, which is a ClogP value calculated by the program CLOGP v4.01.

  Preferable (a2) fatty acid esters include fatty acid esters having a total carbon number of 8 to 40, and esters having a fatty acid group having 6 to 20 carbon atoms and an alkyl group having 2 to 18 carbon atoms are preferred, and particularly 6 to 6 carbon atoms. An ester having 20 fatty acid groups and an alkyl group having 2 to 16 carbon atoms is more preferred. Specifically, cetyl octanoate, cetyl isooctanoate, butyl laurate, isoamyl laurate, methyl myristate, ethyl myristate, isopropyl myristate, octyldodecyl myristate, isopropyl palmitate, ethyl stearate, butyl stearate, isononane Examples include isotridecyl acid, isononyl isononanoate, isopropyl linoleate, isopropyl isostearate, methyl oleate, and ethyl oleate. In addition, fatty acid glycerides such as tri (caprylic acid / capric acid) glycerin and glyceryl tricaprylate having a fatty acid ester structure in the molecule; fatty acid polyglycerides such as polyglyceryl-2 isostearate and polyglyceryl-2 triisostearate; soybean oil , Nuka oil, jojoba oil, avocado oil, almond oil, olive oil, cacao butter, sesame oil, persic oil, castor oil, coconut oil, mink oil, beef tallow, pork fat, and other natural fats and oils. Examples of the resulting oil include glycerides such as glyceryl myristate and glyceryl 2-ethylhexanoate. These fatty acid esters can be used alone or in combination of two or more.

  The content of the (a2) fatty acid ester in the granulated product (A) is preferably 0.1 to 30% by mass, more preferably 0.3 to 15% by mass, further preferably 0.5 to 8% by mass, 1 to 5% by mass is particularly preferred. If it is within this range, it will effectively affect the fineness and foamability of the foam, and while supplying a high concentration of carbon dioxide to the skin, the fatty acid ester itself adsorbs and penetrates the skin in a large amount, thus maintaining a high moist feeling. The effect is obtained, while the shape retention of the granulated product is also good.

  The (a3) nonionic surfactant used in the present invention is used together with the (a2) fatty acid ester, so that when the bath agent composition of the present invention is added to the bath water, the (a2) fatty acid ester is added to the bath water. It is preferable that a sufficient amount of carbon dioxide gas can be dissolved in the (a2) fatty acid ester or (a3) nonionic surfactant micelle, and the adsorption and penetration of the fatty acid ester into the skin is promoted. The (a3) nonionic surfactant is preferable because it generates a large amount of very fine bubbles of carbon dioxide gas when used with a specific carbonate.

  Such nonionic surfactants include sucrose fatty acid esters, glycerin fatty acid esters, propylene glycol fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitol fatty acid esters, polyoxyethylene alkyl ethers, polyoxyethylene alkenyl ethers. , Polyoxyethylene polyoxypropylene glycol, polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene polyoxypropylene alkenyl ether, polyethylene glycol fatty acid ester, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, polyglycerin fatty acid ester, etc. Is mentioned. One kind of nonionic surfactant may be used, but it is preferable to use two or more kinds since the above effect can be further improved.

As the nonionic surfactant, at least HLB10-20 nonionic surfactants, particularly HLB12-18, from the viewpoint of generating a large amount of fine carbon dioxide bubbles and promoting the adsorption of fatty acid esters to the skin. It is preferable to use a nonionic surfactant. 30-100 mass parts is preferable, as for content of the nonionic surfactant of HLB10-20 with respect to 100 mass parts of nonionic surfactant whole quantity in a granulated material (A), 50-100 mass parts is more preferable, 50 -90 mass parts is further more preferable.
Here, HLB is a value normally used to represent the balance between the hydrophilicity and hydrophobicity of the surfactant, and can be obtained by several calculation formulas such as the Kawakami formula commonly used in this field. In the present invention, the following Kawakami equation is adopted.
HLB = 7 + 11.7log (Mw / M0)
Mw: Molecular weight of hydrophilic group M0: Molecular weight of hydrophobic group

  Among these nonionic surfactants, sucrose fatty acid ester, polyoxyethylene alkyl ether, polyoxyethylene alkenyl ether, polyoxyethylene sorbitol fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene hydrogenated castor oil and the like are preferable. . In particular, at least one nonionic surfactant selected from polyoxyethylene alkyl ether and polyoxyethylene alkenyl ether, and at least one nonionic interface selected from polyoxyethylene sorbitol fatty acid ester and polyoxyethylene sorbitan fatty acid ester. It is particularly preferred to combine the activators. By doing this, among the above effects of the nonionic surfactant, in particular, the generation of fine carbon dioxide bubbles is remarkably improved, and as a result, the moist feeling sustaining effect due to the improved adsorption of fatty acid esters is remarkably exhibited. Therefore, it is very preferable.

  The content of the (a3) nonionic surfactant in the granulated product (A) is preferably 10 to 70 mass%, particularly preferably 20 to 60 mass%, in the total amount of the fatty acid ester and the nonionic surfactant. . Within this range, the viewpoint of maintaining the shape retention of the granulated product, the viewpoint of effectively emulsifying the fatty acid ester in the bath water, and effectively acting on the refinement and foaming of carbon dioxide gas bubbles, It is preferable from the viewpoint of promoting the adsorption and penetration of fatty acid esters into the skin.

  The water-soluble binder (a4) used in the present invention is used together with the fatty acid ester and the nonionic surfactant, thereby controlling the solubility of the granulated product and effectively acting on the finer foam and foamability. , Increase the strength of the granulate. In addition, the organic acid is coated with the water-soluble binder, so that the organic acid and the carbonate in the granulated product (A) are prevented from contacting and reacting during storage, and the packaging container is generated by the generation of carbon dioxide gas. Can be prevented from expanding, and the storage stability can be improved.

  The water-soluble binder is preferably thermoplastic. As such a water-soluble binder, polyethylene glycol, polypropylene glycol, polyoxyethylene alkyl ether, and polyoxyethylene phenol ether are preferable, and polyethylene glycol and polypropylene glycol are more preferable.

  Further, the number average molecular weight of the water-soluble binder is preferably 4,000 to 20,000, preferably 6,000 to 13, by GPC method using polystyrene as a standard from the viewpoints of viscosity adjustment and handling properties when powdered. Is more preferable, and 7,000 to 9,000 is more preferable. When measuring the molecular weight of polyethylene glycol as a water-soluble binder, water / ethanol was used as a solvent.

  When these water-soluble binders are used, two or more water-soluble binders having different number average molecular weights may be used in combination.

  2-30 mass% is preferable and, as for content of the water-soluble binder in granulated material (A), 5-20 mass% is more preferable. When the amount is not less than the lower limit, the particle strength when granulated is increased, and the granulated product is hardly broken during the transport process during production. When the amount is not more than the upper limit, the solubility in a hot water bath is improved, the fine foaming property is enhanced, and the adsorption and penetration of the fatty acid ester into the skin is promoted.

  In addition, even if it is a component other than the above in the granulated material (A) in this invention, it can mix | blend suitably in the range which can solve the subject of this invention. Examples of such components include (a2) oily components other than fatty acid esters, disintegration aids, skin feel improvers, antifoaming agents, antioxidants, dispersants, perfumes, antibacterial / antifungal agents, pigments, and crude drugs. Etc.

  (A2) As oily components other than fatty acid esters, when the oily component other than (a2) fatty acid esters has a carbon dioxide oil phase / water phase distribution ratio of 1.1 or more, the warming effect after bathing is further enhanced. This is preferable. A more preferable distribution ratio is 1.3 or more, further preferably 1.5 or more, particularly preferably 1.6 or more, and further preferably 1.7 or more.

As such an oil component,
Hydrocarbon oils such as liquid paraffin, petrolatum, paraffin, microcrystalline wax, ceresin, squalane, squalene, dioctylcyclohexane, bristan;
Higher fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, linoleic acid, linolenic acid, lanolinic acid, isostearic acid;
Higher alcohols such as lauryl alcohol, cetyl alcohol, stearyl alcohol, oleyl alcohol, cholesterol, 2-hexyldecanol;
Peppermint oil, jasmine oil, ginger brain oil, cypress oil, spruce oil, ryu oil, turpentine oil, cinnamon oil, bergamot oil, tangerine oil, ginger oil, pine oil, lavender oil, bay oil, clove oil, hiba oil, Rose oil, eucalyptus oil, lemon oil, thyme oil, peppermint oil, rose oil, sage oil, menthol, cineole, eugenol, citral, citronellal, borneol, linalool, gellerall, camphor, thymol, spirantol, pinene, limonene, terpene Essential oils such as compounds;
Examples thereof include silicone oils.

  In addition, the measuring method of the distribution ratio of the oil phase / water phase of carbon dioxide gas is determined by the method described in Examples described later.

  0.1-30 mass% is preferable and, as for content of oil-based components other than (a2) fatty acid ester in granulated material (A), 0.15-15 mass% is more preferable. It is preferable from a viewpoint of a warm feeling and a skin feel as it is more than the said lower limit, and it is preferable from the viewpoint of stably mix | blending an oil-based component and maintaining the shape retention of a granulated material as it is below the said upper limit.

  By further adding a disintegration aid to the granulated product (A), the disintegration property of the granulated product (A) can be improved and the solubility in a hot water bath can be improved. As the disintegration aid, saccharides and inorganic salts which are solid at normal temperature (20 ° C.) are preferable.

  Examples of the saccharide include glucose, fructose, lactose, maltose, sucrose, dextrin, maltodextrin, cyclodextrin, maltose, fructose, and trehalose.

  Examples of the inorganic salt include sodium sulfate, magnesium sulfate, sodium chloride, potassium chloride, magnesium oxide, sodium polyphosphate, and sodium phosphate. The inorganic salt may contain carbonate, but in that case, granulation is performed. The total amount of the product (A) is less than 15% by mass, preferably less than 2% by mass, particularly preferably less than 1% by mass, and more preferably less than 0.5% by mass from the viewpoint of storage stability. In particular, the carbonate is most preferably not contained in the granulated product (A) from the viewpoint of storage stability.

  The average particle size of the disintegration aid is 1 μm to 100 μm from the viewpoint of granulation, finer foam, foamability, and solubility in bath water when the granulated product (A) is produced. It is preferable to use a certain one, and in particular, when granulating by extrusion granulation, it is more preferable to use one having an average particle size of 3 μm to 50 μm, and one having an average particle size of 5 μm to 30 μm is used. More preferably. When the particle size is larger than the above, it is preferable to disintegrate in advance until a suitable particle size is obtained. The average particle size of the disintegration aid is determined by the measurement method described in the examples.

  From the viewpoint of solubility, the content of the disintegration aid in the granulated product (A) is preferably 0.1% by mass to 15% by mass, and more preferably 1% by mass to 10% by mass.

  The skin feel at the time of bathing can further be improved by mix | blending a skin feel improvement agent in a granulated material (A) further. As such a skin feel improving agent, polyhydric alcohols such as glycerin, propylene glycol and sorbitol are preferable. The content of the skin feel-improving agent in the granulated product (A) is 0.01% by mass to 1% by mass, preferably 0.1% by mass to 0.5% by mass, from the viewpoint of improving the skin feel. .

  The bulk density of the granulated product (A) is 700 g / L or less and 400 to 700 g from the viewpoint of securing the foamability of fine carbon dioxide gas when the bath agent composition of the present invention is administered to bath water. / L is preferable, and 450 to 650 g / L is more preferable. It is considered that the bulk density of the present invention can be achieved by not being too compact during the production of the component (A) described later. In addition, the bulk density of the granulated product of the component (A) is determined by a method defined by JIS K 3362.

  The particle size of the granulated product (A) is 180 μm or less from the viewpoint of suppressing the foaming at the time of using the bath agent composition of the present invention and foaming on the bath water surface when administered to the bath water. The ratio of those is preferably 10% by mass or less, more preferably 8% by mass or less, and further preferably 6% by mass or less. And as for the particle size of a granulated material (A), 10 mass% or less is preferable from a soluble viewpoint, and 10 mass% or less is more preferable, 8 mass% or less is more preferable, and 6 mass% or less is further more preferable.

  Furthermore, the average particle diameter of the granulated product (A) is preferably 100 to 1500 μm, preferably 400 to 1200 μm, and preferably 600 to 900 μm from the viewpoints of powdering, solubility and sedimentation. In addition, the average particle diameter of a granulated material (A) is determined by the measuring method as described in an Example.

  The content of the granulated product (A) in the bath agent composition of the present invention is preferably 30 to 80% by mass, more preferably 35 to 75% by mass, from the viewpoint of obtaining a carbon dioxide generation amount and fine carbon dioxide bubbles. 40-70 mass% is especially preferable.

  The carbonate of the component (B) used in the present invention contains a dialkali metal carbonate and 70% by mass or less of hydrogen carbonate. Examples of the carbonate include sodium carbonate and potassium carbonate which are dialkali metal carbonates; sodium hydrogen carbonate which is a hydrogen carbonate; calcium carbonate which is a metal carbonate of a divalent or higher metal and the like. As the dialkali metal carbonate, sodium carbonate is particularly preferable, and as the hydrogen carbonate, sodium hydrogen carbonate is particularly preferable.

  The content of the hydrogen carbonate in the carbonate of the component (B) is 0 to 70% by mass, further 0.01 to 70% by mass, and further 0.1 in terms of generating fine carbon dioxide bubbles. It is preferable that it is -60 mass%, especially 1-40 mass%. As the amount of hydrogen carbonate in the carbonate increases, the carbon dioxide gas tends to increase without becoming fine carbon dioxide bubbles that are cloudy. However, the present inventors specified a nonionic surfactant in the granulated product (A) and a dialkali metal carbonate in the component (B) for the problem that the bubbles of the carbon dioxide gas become large. It has been found that it is possible to generate a large amount of extremely fine bubbles by adjusting the ratio.

  That is, the content of the nonionic surfactant in the granulated product (A) is preferably 0.5 to 30 parts by mass, and 1 to 25 parts by mass with respect to 100 parts by mass of the dialkali metal carbonate in the component (B). Part is more preferable, 2 to 20 parts by mass is further preferable, and 3 to 10 parts by mass is particularly preferable. When the mass ratio of the nonionic surfactant in the granulated product (A) and the dialkali metal carbonate in the component (B) is within this range, the generation of extremely fine carbon dioxide bubbles is significantly improved, As a result, the effect of maintaining a moist feeling due to the improvement in the adsorptivity of the fatty acid ester is remarkably exhibited, which is very preferable.

  The average particle diameter of the dialkali metal carbonate in the component (B) is preferably 100 to 750 μm, more preferably 200 to 500 μm, particularly 250 to 400 μm, from the viewpoints of finer foam, duration of foam, sedimentation and the like. Is preferred. In addition, the average particle diameter of the dialkali metal carbonate in the component (B) is determined by the measurement method described in the examples.

  The content of the carbonate which is the component (B) in the bath agent composition of the present invention is preferably 20 to 70% by mass, and more preferably 25 to 60% by mass from the viewpoint of obtaining a carbon dioxide generation amount and fine carbon dioxide bubbles. %, Particularly 30 to 50% by mass is preferred.

In the present invention, the components usually used in bath preparations can be added as the component (C) when mixing the component (A) and the component (B) within a range not impairing the effects of the present invention. Such ingredients include:
Sugars such as glucose, fructose, lactose, maltose, sucrose, dextrin, maltodextrin, cyclodextrin, maltose, fructose, trehalose;
Sodium chloride, sodium sulfate, potassium nitrate, sodium nitrate, calcium nitrate, sodium polyphosphate, ammonium chloride, iron sulfate, sodium phosphate, sodium thiosulfate, boric acid, metasilicic acid, anhydrous silicic acid, calcium silicate, magnesium sulfate, sodium chloride, potassium chloride Inorganic salts such as magnesium oxide and sodium polyphosphate;
Sowjutsu, peanut, valerian, keigu, kokuboku, senkyu, orange peel, touki, ginger leaf, carrot, cinnamon, peonies, mint leaves, oxon, sushi, bukuryo, dokukatsu, shobu, gaiyou, matsubusa, juniper, jujube, cypress Herbal medicines such as saffron, duckweed extract, chimney, fennel, chimpi powder, chamomile, melissa, rosemary, maronier, sawtooth grass, arnica;
Alcohols such as ethanol and isopropyl alcohol;
Polyhydric alcohols such as glycerin, propylene glycol, sorbitol;
Titanium oxide, zinc oxide, talc, sulfur, mineral sand, hot spring flower, casein, neutral white clay, sodium salicylate, sodium carboxymethylcellulose, egg yolk powder, iri powder, mica powder, skim milk powder, bactericidal preservative, metal sequestering agent, fragrance, Examples include pigments, crude drugs, and other components necessary for the preparation, but are not limited thereto. You may mix | blend these in a granulated material (A), if it is a range which does not inhibit the effect of this invention.

  In the granular bath agent composition of the present invention, the component (A) and the component (B) are present in independent particle states. Here, “existing in an independent particle state” means that the component (A) and the component (B) in separate and independent particle states exist in a mixed state. Then, the component (A) and the component (B) are mixed and are generally called powder or granule.

  The granule bath agent composition of the present invention is granulated by normal granulation means, that is, granulation with an extrusion granulator or a tumbling granulator after appropriately mixing the components used for component (A). The product (A) can be produced, and further, the particulate (B) carbonate and other bath agent composition raw materials can be mixed.

  The granular bath agent composition of the present invention preferably has a 0.01 mass% aqueous solution having a pH of 5 to 7, particularly 5.5 to 6.5 at 25 ° C. This is because if the pH is 5 to 7, the generated carbon dioxide gas is easily dissolved in the bath water, and the effect of promoting blood circulation is enhanced.

  The granular bath agent composition of the present invention generates a large amount of fine carbon dioxide bubbles when dissolved in bath water. The generation of fine bubbles can be confirmed from the fact that the bath water quickly becomes cloudy due to the generated bubbles of carbon dioxide gas when 40 to 60 g of the bath agent composition of the present invention is dissolved in 180 liters of bath water. The degree of fine foaming is measured by the method described in the examples described later.

  The granular bath agent composition of the present invention is used by dissolving in bath water and generating bubbles of carbon dioxide gas. It is particularly preferable to take a bath while carbon dioxide bubbles are generated. That is, a granulated product containing a component (A) organic acid, a fatty acid ester having a molecular weight of 100 or more and a ClogP value of 4 to 18, a nonionic surfactant and a water-soluble binder, and component (B) dialkali metal carbonate A granular bath agent composition containing a salt and a carbonate containing no bicarbonate or 70% by mass or less is introduced into bath water to start foaming, and bathing during foaming or after foaming If the skin care method involves immersing at least a part of the body in bath water in which bubbles remain, the effects of the present invention are particularly prominent. The bath agent composition of the present invention can be used not only for a whole body bath such as a bath, but also as a partial bath such as a foot bath and an arm bath.

<Particle size>
The particle size was measured by the following two methods.
(1) The particle size of the granulated product (A) and the dialkali metal carbonate is a weight fraction according to the size of the sieve mesh after vibrating for 5 minutes using a standard sieve (mesh 2000 to 125 μm) of JIS K 8801. From the above, the median diameter was calculated.
More specifically, using a 9-stage sieve and a tray with a mesh opening of 125 μm, 180 μm, 250 μm, 355 μm, 500 μm, 710 μm, 1000 μm, 1400 μm, and 2000 μm, the top of the top is stacked in order from the small sieve. Add 100 g of particles from the top of a 2000 μm sieve, cover and attach to a low-tap type sieve shaker (manufactured by HEIKO, tapping 156 times / minute, rolling: 290 times / minute), and shake for 5 minutes. The mass of the particles remaining on each sieve and the tray was measured, and the mass ratio (%) of the particles on each sieve was calculated.

  The average particle size of the disintegration aid was measured using a laser diffraction / scattering particle size distribution analyzer LA-920 (manufactured by Horiba, Ltd.) and the median diameter measured by dispersing the particles in a solvent that did not dissolve the particles. The diameter. In addition, acetone was used as a solvent for the average particle diameter measurement of the fumaric acid and disintegration aid used in the examples.

<Oil absorption capacity>
The oil absorption capacity of the organic acid was measured by the following method. 45 g of powder was put into an absorption measuring device (A410 manufactured by Asahi Research Institute) and rotated at a driving blade of 200 rpm. 50 ° C. mixed solution in which an oil component and a nonionic surfactant are dissolved (Exepal IPP 50% by mass, Kao Corp. Exepar O-DM 15% by mass, Lunac BA 5 manufactured by Kao Corp.) 10% by mass, 10% by mass of Emulgen 306P manufactured by Kao Corporation, and 20% by mass of Nikkor GO-440V manufactured by Nikko Chemicals Co., Ltd. were dropped at a liquid supply rate of 2 mL / min to determine the point at which the maximum torque was obtained. The liquid addition amount at the point where the torque becomes 70% of the point where the maximum torque is reached is divided by the amount of powder input to obtain the oil absorption capacity.

  <Measurement method of distribution ratio of carbon dioxide gas to oil phase / water phase>

Carbon dioxide gas was distributed at room temperature of 25 ° C. by the following method. 2 mL of oil and 8 mL of ion exchange water were placed in a 15 mL screw tube, a nozzle was inserted into the bottom of the tube, and a sufficient amount of carbon dioxide gas was continuously injected for 4 minutes. After stopping the injection, when an oil layer was formed in the upper layer, the oil layer was immediately collected and used as a carbon dioxide measurement sample. Next, a pipette was gently inserted into the bottom of the screw tube to collect an aqueous phase, which was used as a carbon dioxide measurement sample.
The ATR-IR method was used for measuring the carbon dioxide concentration. The IR spectrum of carbon dioxide gas is known to exhibit strong absorption near 2350 cm ⁻¹ , and this absorption is one vibration mode, but in the case of gas, since the rotational transition is superimposed, When measured at a low setting, it is observed that it splits into two absorptions, but when carbon dioxide dissolves in the liquid, rotation is limited, so it is observed as one absorption band. And carbon dioxide dissolved in the liquid is identified.
Measuring condition apparatus: Perkin Elmer SpectrumOne / Universal ATR unit Resolution: 16 cm ^-1
Number of scans: 16 times (about 25 seconds)
Atmospheric correction function: OFF
Measurement sequence: Oil background measurement → Oil phase measurement → Water background measurement → Water phase measurement

Examples 1-6, Comparative Examples 1-4
After mixing the component used for the component (A) shown in Table 1, it granulated with the extrusion granulator, (B) component and another component were mixed, and the granular foaming bath agent was manufactured.

Comparative Example 2
After all the components (A), (B) and other components shown in Table 1 are mixed, a cylindrical tablet having a diameter of 55 mm and a thickness of 15 mm is obtained with a hydraulic press (model number: CD-50-135B) manufactured by Riken. (1 tablet 45g).

Comparative Example 3
Each component was mixed by the mixing | blending shown in Table 1, and the liquid bath agent was obtained.

  About the obtained bath agent composition of Examples 1-6 and Comparative Examples 1-4, the foam state at the time of melt | dissolving in bath water and a usability | use_condition are evaluated, and a result is shown in Table 1.

  <Evaluation method of bath agent composition>

[Degree of fine foaming (turbidity)]
Put hot water of 40 ℃ 180L in the bathtub, add the bath agent composition, stir well, submerge a circular black rubber plate with a diameter of 5cm in the bath water, turbidity to a depth that is completely invisible to the naked eye (turbidity) And measured. It shows that the finer bubble has arisen, so that the numerical value (cm) of depth is small.

(1) Evaluation of persistence of moist feeling after bathing Evaluation was made by a total of 10 panelists of 20 to 40 year old women. After putting hot water of 40L at 40 ° C into the bathtub and putting the bath preparation composition, the paneler is quickly bathed, the moist feeling after 30 minutes of bathing is evaluated according to the following criteria, and the average value of 10 people is evaluated It was.
5: Moist.
4: Slightly moist.
3: I can't say either.
2: Not very moist.
1: Not moist.

(2) Evaluation of warmth feeling after bathing Evaluation was made by a total of 10 panelists of 20 to 40 year old women. After putting hot water of 40 L at 40 ° C. into the bathtub and introducing the bath agent composition, the paneler was quickly bathed, and the warmth feeling immediately after bathing was evaluated according to the following criteria, and the average value of 10 persons was used as the evaluation score.
5: Warm up.
4: Slightly warms up.
3: Equivalent to Sarayu.
2: It does not warm a little compared with Sarayu.
1: Not warm compared with Sarayu.

  From Table 1, if the bath preparation composition of the present invention is used, a large amount of fine carbon dioxide bubbles are generated, and it is not only excellent in the feeling of warming after the bath, but also the amount of adsorption / penetration of fatty acid ester into the skin is remarkable. And the moisture retention ability of the skin is remarkably improved, so that overdrying after bathing can be suppressed, and the moist feeling of the skin after bathing is remarkably sustained.

Claims (4)

The following components (A) and (B):
(A) an organic acid, a granule containing a fatty acid ester having a molecular weight of 100 or more and a ClogP value of 4 to 18, a nonionic surfactant and a water-soluble binder, and (B) containing a dialkali metal carbonate, And the granular bath agent composition containing the carbonate containing 70 mass% or less of hydrogencarbonate.   The granular bath agent composition according to claim 1, wherein the content of the nonionic surfactant in the component (A) is 0.5 to 30 parts by mass with respect to 100 parts by mass of the dialkali metal carbonate in the component (B). .   The granular bath agent composition according to claim 1 or 2, wherein the nonionic surfactant in component (A) contains at least a nonionic surfactant of HLB 10-20.   HLB10-20 nonionic surfactant is selected from sucrose fatty acid ester, polyoxyethylene alkyl ether, polyoxyethylene alkenyl ether, polyoxyethylene sorbitol fatty acid ester, polyoxyethylene sorbitan fatty acid ester and polyoxyethylene hydrogenated castor oil The granular bath composition according to claim 3, wherein the composition is one or more kinds.