JPH0784377B2 - Weakly acidic bath salt - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel weakly acidic bathing agent, more specifically, a bathing agent which contains a carbonate and an acid and exhibits a weakly acidic pH in the bath water when in use, and a rust preventive agent. Thus, the present invention relates to a weakly distributed bath agent with improved bathtub and bathtub damage.

Bath salts are generally composed of a mixture of inorganic salts such as mirabilite, borax, sulfur, salt, carbonate, etc., with fragrances, coloring agents, plant extracts, organic acids, etc. By giving appropriate stimulation, blood circulation is activated, fatigue recovery and metabolism are promoted. Among these bath agents, there is an effervescent bath agent that combines a carbonate and an acid, which generates bubbles of carbon dioxide gas in the bath water,
It has the effect of enhancing the relaxation and refreshing feeling and making bathing enjoyable.

When the bath agent containing the carbonate and the acid is added to the bath water, they react with each other to generate carbon dioxide gas. The effect of the carbon dioxide gas depends on the pH of the bath water. That is, when the pH is acidic, carbon dioxide gas exists as a CO ₂ molecule and exhibits a blood flow promoting action, but when the pH is alkaline, the carbon dioxide gas exists as CO ₃ ²⁻ ion or HCO ₃ ⁻ ion. No effect is seen. Therefore, in order to obtain the effect of the effervescent bath agent, it is necessary to use the effervescent bath agent such that the pH of the bath water becomes weakly acidic when it is added.

However, such an acidic bath agent is extremely difficult to put into practical use because it damages a bath pot, a bathtub, and the like.

Therefore, the present inventors, since the pH of human skin is weakly acidic, in view of the fact that a bathing agent in which the pH of the bath water is weakly acidic has a favorable effect on the skin, a bath agent without the above-mentioned difficulties As a result of earnest research to develop, a bath kettle without diminishing the peculiar effect of the weakly acidic bathing agent by adding a rust preventive agent to the weakly acidic bathing agent containing a carbonate and an acid, It was found that a mild weakly acidic bathing agent which does not generate rust in a bathtub or the like can be obtained, and the present invention was completed.

That is, the present invention provides a weakly acidic bathing agent containing a carbonate and an acid, and a weakly acidic bathing agent containing a rust preventive agent.

Examples of the carbonate to be added to the weakly acidic bath agent of the present invention include sodium hydrogen carbonate, sodium carbonate, sodium sesquicarbonate, potassium hydrogen carbonate, potassium carbonate, potassium sesquicarbonate, ammonium hydrogen carbonate, ammonium carbonate, sesquicarbonate. Examples thereof include ammonium salts, and these can be used alone or in combination of two or more kinds.

As the acid, either an organic acid or an inorganic acid can be used, but a water-soluble and solid acid is preferable. Examples of the organic acid include linear 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), gallic acid,
Oxy acids such as mandelic acid, tropic acid, ascorbic acid and gluconic acid; cinnamic acid, benzoic acid, phenylacetic acid, nicotinic acid, kainic acid, sorbic acid, pyrrolidonecarboxylic acid, trimellitic acid, benzenesulfonic acid, toluenesulfonic acid and these An acidic salt of an organic acid may be mentioned. Examples of the inorganic acid include phosphoric acid, potassium dihydrogen phosphate, sodium dihydrogen phosphate, sodium sulfite, potassium sulfite, sodium pyrosulfite (sodium metabisulfite), potassium pyrosulfite (potassium metabisulfite), acidic hexametaline. Sodium acid, potassium acid hexametaphosphate, sodium acid pyrophosphate, potassium acid pyrophosphate, sulfamic acid and the like can be mentioned. Among them, aliphatic dicarboxylic acids such as succinic acid, fumaric acid, phosphoric acid and their acid salts are preferable.

Furthermore, as the rust preventive agent, water-soluble ones are preferable, and the following ones can be mentioned.

Inorganic anticorrosive agent Sodium, potassium, ammonium salt of polymerized phosphoric acid compound such as pyrophosphoric acid, triphosphoric acid, trimetaphosphoric acid, tetrametaphosphoric acid; sodium, potassium or lithium salt of silicic acid, sodium orthosilicate, sodium metasilicate, Silicates such as sodium disilicate and sodium tetrasilicate; nitrites such as sodium, ammonium, potassium or lithium salts; borates such as sodium, potassium or lithium salts.

Organic rust preventives phytic acid, benzotriazole, 2-mercaptothiazole, unsaturated fatty acids having 16 or more carbon atoms (preferably having 16 to 20 carbon atoms), among them, oleic acid, linoleic acid, linolenic acid; Alkenyl succinic acid having 22 (preferably 10 to 14 carbon atoms) alkenyl group, 2-alkyl (6 to 16 carbon atoms) -N-carboxymethyl-N-hydroxyethyl imidazolium betaine, formula (Wherein R represents an alkyl group having 8 to 20 carbon atoms, Me represents a monovalent counterion such as an alkali metal), N-alkyl (8 to 20 carbon atoms) -N-methyl -Β-alanine alkali metal salt, fatty acid diethanolamide having 8 to 20 carbon atoms, alkyl sarcosine alkali metal salt having 8 to 20 carbon atoms, formula (In the formula, Me is the same as above. M is a number of 2 to 6), an organic phosphate system represented by the following formula, a sorbitan fatty acid (C 8 to C 20) ester, and the following general formulas (1) to (4) ) The compound represented by.

(In the formula, R₁Is an alkyl group having 5 to 20 carbon atoms or alkene
Lu group, R₂Is a hydrogen atom, C₂H_FourOH, C₂H_FourCOOX, C₂H_FourCOOC₂H_Five
Or C₂H_FourOC₂H_FourCOOC₂H_Five, R₃Is a hydrogen atom, C₂H_FourOH, C₂H_FourCO
OX, CH₂COOX or C₂H_FourOC₂H_FourCOOX, R_FourIs CH₂COO Or C₂H_Four
COO , X is a hydrogen atom, alkali metal, ammonium or
Indicates a water-soluble alkanolamine).

Among these rust preventives, salts of phosphoric acid compounds, silicates and fatty acid compounds are particularly preferable.

The compounding amount of the carbonate and the acid of the weakly acidic bathing agent of the present invention is such that the bathing water exhibits weak acidity when the solvent is added to the bathing water, that is, a 0.01 wt% aqueous solution of the bathing agent has a pH of 4 to 7, particularly It is necessary to adjust the pH to preferably 6.0 to 6.7.
When the pH is lower than 4, there is a strong irritation to the skin and there is a fear of damaging a bathtub or the like, and when the pH exceeds 7, the effect of the present invention is not exhibited.

Effect of the present invention, pH is show carbon dioxide present to blood flow promoting action as CO ₂ molecules in the case of acidic, pH is carbonic acid gas in an alkaline side CO ₃ ^2- ions or HCO ₃ ^- as an ion It is based on the principle that the effect is not seen at all because it exists.

The blending amounts of the carbonate and the acid for satisfying such conditions vary depending on these types, but the carbonate is 5 to 80% by weight, particularly 10 to 50%, and the acid is 10 to 50% by weight with respect to the total composition. 80%, especially 15 ~
50% is preferred.

Further, the rust preventive agent can be blended in a wide range of amount, but generally 0.05 to 10%, particularly 0.1 to 5% is preferable with respect to the total composition.

Furthermore, the bath salts of the present invention are generally blended, fragrances, pigments or vitamins, hot spring active ingredients, enzymes such as proteolytic enzymes, seaweed extracts, sodium alginate, lanolin, silicon, amphoteric surfactants, The effect can be further enhanced by blending a crude drug or its extract.

The weakly acidic bath salts of the present invention include powders, granules, crystals, tablets and the like.
Particularly preferably, it can be in the form of tablets, and for the formulation thereof, if necessary, an excipient, a binder, a disintegrating agent,
Lubricants and the like can also be added.

As described above, since the pH of the weakly acidic bath agent of the present invention is almost the same as that of human skin, it has a favorable effect on the skin. Moreover, the carbon dioxide gas generated when it is poured into a bath water does not have a blood flow promoting effect because it exists as an ion in alkaline conditions, but as in the present invention, it exists as a CO ₂ molecule in an acidic region and has an excellent effect of promoting blood circulation in the skin. Play.

Next, examples will be described.

Example 1 A test piece of 3 × 5 cm of copper, aluminum and brass was immersed in a 0.05% aqueous solution of a bathing agent shown in Table 1 (adjusted to pH 6.3).
It was immersed at 0 ° C. for 1 month, and the surface condition was visually observed. The results are shown in Table 1. (X) indicates that surface corrosion was observed, and (O) indicates that no change was observed.

Claims (1)

[Claims] 1. A weakly acidic bathing agent containing a carbonate and an acid, and a rust preventive agent added thereto.