JP2009155213A - Granular bath agent composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a granular bath agent composition affording a sufficiently high gaseous carbon dioxide concentration, and having good preservation stability. <P>SOLUTION: The granular bath agent composition comprises following ingredients (A) to (C): (A) 25-55 mass% of an alkali metal carbonate in which ≥50% of particles have ≥180 μm particle diameter, (B) 40-70 mass% of an organic acid in which ≥50% of particles have ≥180 μm particle diameter, and (C) 0.01-10 mass% of a slightly water-soluble metal oxide. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a granular bath agent composition in which carbon dioxide gas is dissolved at a high concentration in bath water and has good storage stability.

  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 bath water and provides blood circulation promoting effect by the carbon dioxide gas. In order to enhance the blood circulation promoting effect, it is necessary to increase the concentration of carbon dioxide gas generated in the bath water.

As a form of such a bath agent, a tablet type that can be slowly dissolved near the bottom of the bathtub and a powder or granular bath agent that has a short dissolution time are generally selected depending on the use state and preference. Therefore, various studies have been conducted on granular bath preparations in order to control the dissolution time and foaming property, to quickly foam and increase the carbon dioxide concentration. For example, a technique for dissolving carbon dioxide gas in a short time by controlling the particle size of carbonate or organic acid (Patent Documents 1 and 2), a technique for coating an organic acid with a water-soluble polymer (Patent Document 3) ) Etc. have been reported. Further, as a technique for sufficiently increasing the concentration of carbon dioxide gas by dissolving while precipitating in bath water, for example, two or more carbonates and organic acids having different dissolution patterns in bath water are used. A granular bathing agent (Patent Document 4), which is a carbonate containing at least one of the carbonates and precipitated without substantially dissolving up to the bottom of the bathtub, has been reported. In addition, a technology that dissolves a sufficient amount of carbon dioxide gas in bath water in a short time by adding a water-soluble substance other than carbonate and organic acid to a foamed substance of carbonate and organic acid of a specific particle size Reference 5) has been reported.
JP-A-11-47220 JP 2004-131455 A Japanese Patent Laid-Open No. 11-47221 JP 2000-309523 A JP 2005-298454 A

However, there is no description regarding storage stability and caking in these granular bath agents. Further, regarding the concentration of carbon dioxide dissolved in the bath water, it is necessary to dissolve the carbonate and the like without remaining undissolved, and to increase the concentration of carbon dioxide gas in the bath water.
Accordingly, an object of the present invention is to provide a granular bath agent having a sufficiently high carbon dioxide gas concentration and good storage stability.

Therefore, the present inventors have conducted various studies on the control of the particle size as a technique for dissolving carbon dioxide gas generated by carbonate and organic acid in bath water at a high concentration. It has been found that by setting 50% or more to 180 μm or more, high-concentration carbon dioxide gas can be dissolved in the bath water. However, it has been found that such a granular bath agent containing both a carbonate having a large particle size and an organic acid causes caking during storage and has a problem of stability.
Therefore, further investigation revealed that the caking could not be prevented by the blending of sodium sulfate, which is a typical desiccant, and surprisingly, a small amount of poorly water-soluble metal was added to the carbonate and organic acid having the above specific particle size. It has been found that if an oxide is blended, a granular bath agent can be obtained which is stable for a long time without causing caking during storage and can dissolve a high concentration of carbon dioxide in the bath water.

That is, the present invention includes the following components (A) to (C):
(A) 25 to 55% by mass of an alkali metal carbonate having a particle diameter of 180 μm or more and 50% or more,
(B) 40 to 70% by mass of an organic acid in which particles having a particle size of 180 μm or more are 50% or more, and (C) a hardly water-soluble metal oxide 0.01 to 10% by mass
The granular bath agent composition containing this is provided.

If the granular bath agent composition of the present invention is added to bath water, high-concentration carbon dioxide gas can be dissolved in the bath water, and an artificial carbonated spring bath excellent in warm bath effect can be obtained. In addition, there is no roughness when dissolved, and the feeling of use is good. Furthermore, no caking occurs even when stored for a long time, and no blistering of the packaging bag occurs.
According to the granular bath agent composition of the present invention, an artificial carbonated spring bath containing a high concentration of carbon dioxide gas can be easily obtained, so that it is particularly useful as a partial bath agent such as a foot bath and an arm bath.

The main component of the alkali metal carbonate as a carbon dioxide gas generation source in the granular bath agent composition of the present invention is that (A) particles having a particle diameter of 180 μm or more are dissolved in the concentration of the generated carbon dioxide gas in the bath water. The alkali metal carbonate is 50% or more. Examples of the alkali metal carbonate include dialkali metal carbonates such as sodium carbonate and potassium carbonate, and alkali metal hydrogen carbonates such as sodium hydrogen carbonate and potassium hydrogen carbonate. Of these, sodium carbonate (Na ₂ CO ₃ ) and sodium hydrogen carbonate (NaHCO ₃ ) are particularly preferable.

  (A) As alkali metal carbonate, (A1) dialkali metal carbonate and (A2) alkali metal hydrogen carbonate can be used in combination. The weight ratio of (A1) to (A2) is preferably 50 to 100: 50 to 0 in terms of storage stability because a large amount of carbon dioxide gas is generated.

The particle diameter of the alkali metal carbonate is 50% or more for particles having a particle size of 180 μm or more, but more than 60%, particularly 70% from the viewpoints of foam duration, sedimentation, solubility of carbon dioxide in bath water, and the like. % Or more is preferable. When the particle size is 180 μm or more, the dissolution time when added to the bath water is not too long, and carbon dioxide gas can be generated in the bath water in a short time. Further, the alkali metal carbonate preferably has a particle size of 180 μm to 1000 μm of 50% or more.
Further, considering the solubility of carbon dioxide gas in the hot water, it is preferable that 90 μm or less particles are 10% or less, and 1400 μm or more particles are 10% or less.

  In the present invention, for example, “50% or more” of particles having a particle diameter of 180 μm or more means that the weight of particles having a particle diameter of 180 μm or more is 50% or more of the total particle weight. The particle diameter can be measured by a sieving method.

  The content of the alkali metal carbonate salt in the bath agent composition is 25 to 55% by mass from the viewpoint of carbon dioxide generation amount and solubility, but is more preferably 30 to 55% by mass, and particularly preferably 32 to 50% by mass.

  The organic acid (B) used in the present invention contains 50% or more of particles having a particle size of 180 μm or more, preferably 60% or more, particularly preferably 70% or more. If particles with a particle diameter of 180 μm or more are 50% or more, carbon dioxide gas is sufficiently dissolved in the bath water.

  The organic acid used in the present invention is preferably 50% or more, particularly 60% or more, more particularly 70% or more of particles having a particle diameter of 250 μm to 1000 μm. Moreover, it is preferable that the particle | grains of 90 micrometers or less are 10% or less from the point of the carbon dioxide solubility in a bath water, and the particle | grains of 1400 micrometers or more are 10% or less from the point of the solubility in a bath water.

  Examples of the organic acid (B) include citric acid, tartaric acid, malic acid, malonic acid, pyridonecarboxylic acid, succinic acid, fumaric acid, adipic acid, glutaric acid, and the like. More than one species can be used. Among these organic acids, an organic acid having a high solubility in water is preferable from the viewpoint of increasing the concentration of carbon dioxide gas in the bath water and suppressing roughness, and has a solubility in water of 10 g / 100 mL (20 ° C.) or more, particularly in water. Is preferably 50 g / 100 mL or more of organic acid. Examples of such organic acids include citric acid, tartaric acid, malic acid, malonic acid, and the like, and citric acid, tartaric acid, and malic acid are more preferable.

  The content of the organic acid (B) in the bath preparation composition is 40 to 70% by mass, but it is further 50 to 70% by mass, particularly 55 to 70% by mass from the viewpoint of carbon dioxide generation amount and solubility. % Is preferred.

  (B) The organic acid may be blended as it is in the bath agent, or may be coated with a surfactant such as a water-soluble polymer, oil component, nonionic surfactant, and granulated for use. .

  Specific examples of the water-soluble polymer include polyethylene glycol, polyvinyl alcohol, polyvinyl pyrrolidone, methyl cellulose, ethyl cellulose, carboxymethyl cellulose, hydroxymethyl cellulose, hydroxypropyl methyl cellulose, gum arabic, xanthan gum, guar gum, gelatin, carrageenan, sodium alginate, polyacrylic acid Sodium, dextrin, starch, agar, casein, albumin, collagen and the like can be mentioned. Among them, polyethylene glycol, polyvinyl alcohol, polyvinyl pyrrolidone, methyl cellulose, ethyl cellulose, carboxymethyl cellulose, Hydroxymethylcellulose and hydroxypropylmethylcellulose are preferred Arbitrariness. These may be used alone or in combination of two or more. In addition, the content of these water-soluble polymers in the bath agent of the present invention is the effect of preventing the scattering of organic acids, the prevention of bath water from stickiness, the prevention of bath slip, the prevention of thickening of bath water, and the decrease in feel. 0.001 to 10% by mass, particularly 0.1 to 5% by mass is preferable.

  Specific oil components include mineral oils such as liquid paraffin and white petrolatum; plant oils such as cinnamon oil, bergamo oil, cocoon oil, lavender oil, olive oil, soybean oil, pine oil, nuka oil, rice bran extract, jojoba oil, etc. Oils: fatty acid esters such as isopropyl myristate and other ester oils, linear, branched or cyclic silicones, 3-methyl-3-methoxybutanol, triethyl citrate and the like. Of these, dipropylene glycol, 2-ethoxyethanol, isopropyl myristate, 3-methyl-3-methoxybutanol, triethyl citrate, liquid paraffin, and cinnamon oil are preferable. These may be used alone or in combination of two or more. In addition, the content of the oil component in the bath agent of the present invention is 0.01 to 10% by mass, particularly 0. 0% from the viewpoints of prevention of oil floating when added to bath water, prevention of stickiness and prevention of particle sticking. 1-5 mass% is preferable.

  Surfactants include nonionic surfactants such as glycerin fatty acid esters, propylene glycol fatty acid esters, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbit fatty acid esters, polyoxyethylene alkyl ethers, polyoxypropylenes. Examples include alkyl ether, polyoxyethylene polyoxypropylene glycol, polyoxyethylene polyoxypropylene alkyl ether, polyethylene glycol fatty acid ester, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, polyglycerin fatty acid ester, and sucrose fatty acid ester. It is done. The content of the surfactant in the bath agent of the present invention is 0.001 to 5% by mass, further 0.1 to 5% from the viewpoint of preventing oil floating when added to the bath water, preventing excessive foaming, and preventing stickiness. 5 mass%, especially 0.1-3 mass% is preferable.

  The (C) poorly water-soluble metal oxide used in the present invention is particularly important from the viewpoint of long-term storage stability. As the water-insoluble metal oxide, alkaline earth metal oxides such as magnesium oxide, calcium oxide, and zinc oxide are particularly preferable. Usually, since caking during storage is considered to be caused by water, the occurrence of caking could not be prevented when sodium sulfate known as a typical desiccant was blended in place of metal oxide. Therefore, it is clear that the effect of the (C) poorly water-soluble metal oxide in the present invention is not due to mere drying.

  (C) The average particle size of the hardly water-soluble metal oxide is preferably 1 to 3000 μm, particularly preferably 1 to 1000 μm. In addition, the content of the (C) sparingly water-soluble metal oxide in the bath preparation is 0.01 to 10% by mass, and 0.1 to 10% by mass is preferable from the viewpoint of storage stability and suppression of roughness. Especially 0.1-5 mass% is preferable.

  The granular bath agent of the present invention preferably has a 0.01 wt% 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 effects such as blood circulation promotion are easily exhibited.

  The bath preparation of the present invention is not a tablet type but is granular or powdery from the point of quickly increasing the carbon dioxide concentration in the bath water, and the maximum particle size is 3000 μm or less, further 2000 μm or less, particularly 1500 μm or less. preferable.

  In this invention, the component normally used for the bath agent can be added in the range which does not inhibit the effect of this invention. Examples thereof include inorganic salts such as magnesium sulfate, vitamins such as vitamin A, proteolytic enzymes such as pepsin, coloring agents, and fragrances.

  The granular bath agent of the present invention can be produced by mixing the above components. The granular bath agent of the present invention is preferably used after dissolving in bath water and dissolving carbon dioxide gas in bath water. The bath preparation of the present invention can also be used as a whole body bath such as a bath. In particular, it can generate bath water containing high-concentration carbon dioxide, that is, dissolves in a short time (about 1 minute) with a small amount of hot water (about 5 to 10 L) used in a general foot bath. It is particularly preferable to use it as a partial bath such as a foot bath or an arm bath because sometimes the problem of roughness is not recognized and a very high concentration of carbon dioxide gas dissolves.

Examples 1-5, Comparative Examples 1-3
Each component was mixed by the mixing | blending shown in Table 1, and the granular bath agent composition was manufactured. About the obtained bath agent, the density | concentration measurement of carbon dioxide gas, roughness evaluation, and storage stability were evaluated, and a result is shown in Table 1.

[Measurement of carbon dioxide concentration, evaluation of roughness]
45 g of the granular bath agent composition obtained above was added to 6 L of bath water at 38 ° C., stirred and allowed to stand for 1 minute, and then the bath water was diluted 10 times with ion-exchanged water, and a carbon dioxide electrode was used. The carbon dioxide concentration was measured. Moreover, after stirring and leaving for 1 minute, the vicinity of the waterline was touched by hand and the presence or absence of roughness was evaluated.

[Storage stability]
Further, 45 g of the obtained granular bath agent was packaged in an aluminum pillow, and after storage at 50 ° C. for 1 month, the presence or absence of blistering of the package and the presence or absence of caking were evaluated.

  The results are shown in Table 1. As is apparent from Table 1, a small amount of a hardly water-soluble metal oxide is added to an alkali metal carbonate having a particle size of 180 μm or more and an organic acid having a particle size of 180 μm or more to an organic acid of 50% or more. Then, bath water having a carbon dioxide gas concentration as high as 1000 ppm can be obtained, and a bath agent having no storage roughness and good storage stability can be obtained. On the other hand, the concentration of carbon dioxide gas at a high concentration does not increase with a bath preparation containing a carbonate or organic acid whose particle size is less than 50% (particles of 180 μm) (Comparative Example). Moreover, caking could not be prevented by blending sodium sulfate, which is well known as a desiccant, but was prevented by blending a poorly water-soluble metal oxide.

  When the blending ratio of sodium carbonate and sodium bicarbonate was 50 to 100: 50 to 0, the storage stability such as packaging swelling was particularly good. Further, when an organic acid having a solubility of 10 g / 100 mL or more was used as the organic acid, compared with succinic acid having a low solubility (solubility 6.45), the effect of suppressing roughness was high.

Claims (5)

The following components (A) to (C):
(A) 25 to 55% by mass of an alkali metal carbonate having a particle diameter of 180 μm or more and 50% or more,
(B) 40 to 70% by mass of an organic acid in which particles having a particle size of 180 μm or more are 50% or more, and (C) a hardly water-soluble metal oxide 0.01 to 10% by mass
A granular bath composition comprising:   The (A) alkali metal carbonate contains (A1) a dialkali metal carbonate and (A2) an alkali metal hydrogen carbonate, and the weight ratio (A1: A2) is 50-100: 50-0. 2. The granular bath composition according to 1.   (B) The granular bath agent composition according to claim 1 or 2, wherein the organic acid is an organic acid having a solubility in water of 10 g / 100 mL (20 ° C) or more.   (C) The sparingly water-soluble metal oxide is 1 or more types chosen from magnesium oxide, calcium oxide, and zinc oxide, The granular bath agent composition of any one of Claims 1-3.   The granular bath agent composition according to any one of claims 1 to 4, which is used for a partial bath.