JPS632927B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention provides a novel weakly acidic bath additive, more specifically,
Concerning a weakly acidic bath additive that synergistically enhances blood circulation promoting effects and skin moisture by incorporating a sebum secretion promoter into a bathing additive that contains carbonate and acid and exhibits a slightly acidic bath water PH when used. . Bath additives are generally a mixture of inorganic salts such as mirabilite, borax, sulfur, salt, carbonate, etc., combined with fragrances, colorants, plant extracts, organic acids, etc., and add fragrance to the bath water.
By adding color and moderate stimulation to the skin surface, it activates blood circulation, relieves fatigue, and improves metabolism. Among these bath additives, there are effervescent bath additives that combine carbonate and acid, which generate carbon dioxide gas bubbles in the bath water, increasing the feeling of relaxation and refreshment, and making bathing more enjoyable. has. However, conventional foaming bath additives are neutral or slightly alkaline, and almost all of the carbon dioxide gas generated does not dissolve in the water and evaporates into the air, so the carbon dioxide bubbles are simply a sensation. It had only a mechanical effect. Therefore, the present invention has been developed through various research, and by creating a bath additive that contains carbonate and acid and makes the PH of the bath water slightly acidic, it retains carbon dioxide gas in the bath liquid, promotes blood circulation, and cools the bath water. We have developed a weakly acidic bath additive that does not cause Furthermore, the present inventor has now completed the present invention by discovering that when a sebum secretion promoter is added to the composition, the blood circulation promoting effect and skin moisture are synergistically enhanced. That is, the present invention provides a weakly acidic bathing agent containing a carbonate and an acid, which contains a sebum secretion stimulant. Examples of carbonates to be added to the weakly acidic bath additives of the present invention include sodium hydrogen carbonate, sodium carbonate, sodium sesquicarbonate, potassium hydrogen carbonate,
Potassium carbonate, potassium sesquicarbonate, ammonium bicarbonate salt, ammonium carbonate salt, ammonium sesquicarbonate salt, etc. are mentioned, and these can be used alone or in combination of two or more kinds. Further, as the acid, both organic acids and inorganic acids can be used, but water-soluble and solid acids are preferred.
Examples of organic acids include straight chain fatty acids such as formic acid, acetic acid, propionic acid, butyric acid, and valeric acid; oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, fumaric acid, maleic acid, phthalic acid, Dicarboxylic acids such as isophthalic acid and terephthalic acid; acidic amino acids such as glutamic acid and aspartic acid;
Glycolic acid, lactic acid, hydroxyacrylic acid, α
- Oxybutyric acid, glyceric acid, tartronic acid, malic acid, tartaric acid, citric acid, salicylic acid (o,
m, p), oxyacids such as gallic acid, mandelic acid, tropic acid, ascorbic acid, gluconic acid; cinnamic acid, benzoic acid, phenylacetic acid, nicotinic acid, kainic acid, sorbic acid, pyrrolidonecarboxylic acid, trimellitic acid, benzene Examples include sulfonic acid, toluenesulfonic acid, and acid salts of these organic acids. Examples of inorganic acids include phosphoric acid, potassium dihydrogen phosphate, sodium dihydrogen phosphate, sodium sulfite, potassium sulfite, sodium metabisulfite, potassium metabisulfite, (potassium metabisulfite) acid hexamethalin Examples include sodium acid, potassium acid hexametaphosphate, sodium acid pyrophosphate, potassium acid pyrophosphate, and sulfamic acid. Among these, aliphatic dicarboxylic acids such as succinic acid, fumaric acid, phosphoric acid, and acid salts thereof are preferred. Furthermore, typical sebum secretion promoters used in the present invention include the following. General formula () (wherein R has a total of 11 to 23 carbon atoms,
A branched fatty acid cholesteryl ester represented by: a saturated aliphatic hydrocarbon group having at least one alkyl substituent from the carboxyl group bonding position to the center of the main chain. γ-oryzanol. Yokuinin or Yokuinin extract with a molecular weight of 1500 or less. Of the branched fatty acid cholesteryl esters, R in the formula () is (However, the sum of m and n is 14, and the distribution is centered at m=n=7.) Preferably, it is expressed as follows. Yokuinin extract is prepared by any of the following methods. (1) Extract raw or dried Yokuinin with an alcohol solution having a concentration of 50% by weight or higher (hereinafter simply expressed as %), and if necessary, filter the extract to remove the solvent and concentrate. In order to effectively extract the active ingredients, it is desirable to use ethanol at a concentration of 50-80%. (2) Extract raw or dried yokuinin with water or a hydrophilic organic solvent such as alcohol or acetone at a concentration of 50% or less, or a hydrophilic organic solvent containing water, and collect the liquid by filtering or centrifuging the extract. After removing and concentrating the solvent as necessary, gel filtration is performed using a molecular sieve such as Sephadex to separate a fraction with a molecular weight of about 1500 or less, and the solvent is removed and concentrated as necessary. (3) Extract fresh or dried yokuinin with water, alcohol with a concentration of 50% or less, a hydrophilic organic solvent such as acetone, or a water-containing hydrophilic organic solvent, and collect the liquid by filtering or centrifuging the extract. After removing the solvent and concentrating if necessary, add alcohol to reach a final concentration of 50%.
Adjust so that the amount is as follows. The prepared solution is filtered or centrifuged to collect the solution, and if necessary, the solvent is removed and concentrated. Ethanol at a concentration of 50-80% is desirable to effectively extract the active ingredients. The above-mentioned extraction can be carried out by either cold immersion or digestion, but it is usually preferable to carry out the extraction at a temperature of 40 to 70°C for several hours to several days. The amount of carbonate and acid in the weakly acidic bath additive of the present invention is as follows:
It is necessary to adjust the ratio so that when the bath additive is added to the bath water, the bath water exhibits weak acidity, that is, a 0.01% by weight aqueous solution of the bath additive has a pH of 4 to 7, particularly preferably PH 6.0 to 6.7. be. If the pH is lower than 4, there is a risk of strong skin irritation and damage to the bathtub, etc. If the pH is higher than 7, the effects of the present invention will not be achieved. The effect of the present invention is that when the pH is acidic, carbon dioxide gas exists as CO ₂ molecules and exhibits a blood flow promoting effect, but when the pH is alkaline, carbon dioxide gas exists as CO ₃ ^2- ions or HCO ₃ ^- ions. This is based on the principle that the effect is not observed at all because the The blending amounts of carbonate and acid to satisfy these conditions vary depending on their type, but the carbonate should be 5 to 80% by weight, especially 10 to 50%, and the acid should be 10 to 50% by weight of the total composition. 80%, especially 15-50% is preferred. The sebum secretion promoter can be added in a wide range of amounts, but it is generally preferably 0.1 to 5.0%, particularly 0.5 to 2.0%, based on the total composition. Furthermore, the bath additives of the present invention contain commonly-used fragrances, pigments, vitamins, hot spring active ingredients, proteolytic enzymes, seaweed extracts, sodium alginate, lanolin, silicone, herbal medicines or their extracts, etc. The effect can be further enhanced. The weakly acidic bath additives of the present invention include powder, granules, crystals,
It can be made into a tablet, particularly preferably in the form of a tablet, and excipients, binders, disintegrants, lubricants, etc. can be added as necessary for the formulation thereof. As mentioned above, the weakly acidic bath additive of the present invention has a pH that is approximately the same as that of human skin, and therefore has a favorable effect on the skin. Moreover, the carbon dioxide gas generated when bath water is poured into bath water exists as ions in alkaline conditions and has no effect of promoting blood flow, but in acidic conditions as in the present invention, it exists as CO ₂ molecules and has an excellent effect of promoting blood circulation in the skin. play. Next, an example will be given and explained. Example 1 Bath additives having the composition shown in Table 1 were prepared, each bath additive was added to bath water to make a 0.01% aqueous solution, and 30 panelists were asked to use it in the usual manner for one month. Overall evaluation as a bath additive (overall usability)
The presence or absence of cooling water and the feeling of moisture on the skin were examined.

【table】 The results are shown in Table 2.

【table】

Claims (1)

[Scope of Claims] 1. A weakly acidic bathing agent containing a carbonate and an acid, characterized in that it contains a sebum secretion promoter. 2 The sebum secretion stimulant has the general formula () (In the formula, R represents a saturated aliphatic hydrocarbon group having a total of 11 to 23 carbon atoms and having at least one alkyl substituent from the carboxyl group bonding position to the center of the main chain.) fatty acid cholesteryl ester,
The weakly acidic bath additive according to claim 1, which is γ-oryzanol, or Yokuinin or Yokuinin extract, and has a molecular weight of 1500 or less.