JPH05148500A - Liquid soap composition - Google Patents

Abstract

PURPOSE:To provide the title composition low in skin irritability, also highly fluid even at low temperatures, containing a specific fatty acid salt and urea at specified proportion. CONSTITUTION:The objective composition with a pH of 7-9, containing (A) 100 pts.wt. of a 12-18C fatty acid salt with at least part of the alkali components being alkanolamine and (B) 0.5-35 pts.wt. of urea.

Description

Detailed Description of the Invention

[0001]

The present invention has little skin irritation,
The present invention also relates to a liquid soap composition having excellent low temperature stability.

[0002]

2. Description of the Related Art Soap is generally classified into solid bar soap and liquid soap bar. The solid soap is generally a mixture of coconut oil and beef tallow at about 20:80, which is soaped with caustic soda. On the other hand, liquid soap is coconut oil or coconut fatty acid soaped with caustic potassium.

The fatty acids constituting coconut oil or coconut fatty acids generally have 8 to 18 carbon atoms, and since they contain fatty acids having a relatively small number of carbon atoms, they become liquid when soaped. on the other hand,
Fatty acids constituting beef tallow fatty acids generally have 14 to 1 carbon atoms.
Since it is as long as 8, it is solid at room temperature even when it is soaped.

[0004]

By the way, synthetic surfactants typified by sodium alkylbenzenesulfonate are widely used as kitchen detergents, shampoos, etc. because they are liquid at room temperature and easily dissolved. In recent years, a detergent containing a synthetic surfactant as a main component, a so-called body shampoo, has been used instead of soap for bath.

However, the synthetic surfactant has a drawback that the skin becomes slimy even after washing with water and washing. On the other hand, since soap forms a salt with calcium or magnesium in water, it has an advantage that after washing with water, the skin does not get wet and the skin feels smooth.

On the other hand, among soaps, there is a liquid soap obtained by soaping coconut oil or coconut fatty acid with caustic potassium as described above. Since coconut oil or coconut fatty acid contains a fatty acid having a small number of carbon atoms, it is easily liquefied. However, carbon number 8
Since caprylic acid and capric acid having 10 carbon atoms have an odor, when liquid soap is used, the odor remains even after washing with water. In addition, fatty acids with a low carbon number
It has the drawback of being irritating to the skin and weak in detergency, foamability and foam retention.

Further, an acidic liquid soap obtained by adding ureas, a surfactant and an acid to an alkanolamine salt of a fatty acid is known (Japanese Patent Publication No. 51-44525). However, since this liquid soap contains a surfactant, it has a drawback that the skin becomes wet after washing with water as described above.

[0008] Therefore, an object of the present invention is to provide a liquid soap composition containing a fatty acid salt having 12 or more carbon atoms as a main component, which is capable of maintaining fluidity at room temperature and is less irritating to the skin.

[0009]

The present invention comprises one kind or two kinds.
100 parts by weight of a fatty acid salt of 12 to 18 carbon atoms of one or more kinds and 0.5 to 35 parts by weight of urea, at least a part of the alkali forming the fatty acid salt is an alkanolamine, and the pH is 7 ~ 9 liquid soap composition.

The present invention will be described in detail below. The liquid soap composition of the present invention has a fatty acid salt composition of 12 carbon atoms.
By using a fatty acid salt of ~ 18, it is possible to obtain a liquid soap composition which suppresses skin irritation and is excellent in low temperature stability.

In order to produce a liquid soap excellent in low-temperature stability, it is preferable that the fatty acid salt having 12 and 14 carbon atoms is 70 to 90% by weight, and the fatty acid salt having 16 and 18 carbon atoms is 70 to 10% by weight. As the fatty acid salt having 12 and 14 carbon atoms,
Mention may be made of laurate and myristate. Further, isolaurilate and isomyristate can be used. These fatty acid salts can be used alone or in combination. On the other hand, carbon number 16
Examples of the fatty acid salts of 18 and 18 include palmitate and stearate. Furthermore, isopalmitate and isostearate can be used. These fatty acid salts can be used alone or in combination.

In the above fatty acid salt, at least a part of the alkali forming the salt is an alkanolamine, and the pH of the liquid soap composition is 7 to 9, preferably 7 to 8.5.
Is. By adjusting the pH of the liquid soap composition to 7-9, skin irritation can be minimized. Further, the ratio of the alkanolamine salt is adjusted so that the pH of the liquid soap composition is 7-9. That is, the fatty acid salt is
All are alkanolamine salts, or some are alkanolamine salts and the rest are alkali metal salts (eg sodium salts, potassium salts). Examples of the alkanolamine include triethanolamine, diethanolamine, monoethanolamine and the like.

The liquid soap composition of the present invention has 12 to 12 carbon atoms.
Urea 0.5 to 3 per 100 parts by weight of 18 fatty acid salts
5 parts by weight, preferably 5 to 25 parts by weight. By including urea in this range, it is possible to impart further excellent low temperature stability to the liquid soap composition.

The liquid soap composition of the present invention may contain water and, if desired, a chelating agent, an electrolyte, a humectant, a builder, a surfactant, a fragrance, a dye and the like in addition to the above components.

The chelating agent sequesters calcium such as calcium and magnesium ions in water,
Examples thereof include ethylenediaminetetraacetic acid (EDTA) salt and nitrilotriacetic acid.

The electrolyte is one that ensures neutralization when the fatty acid is neutralized with an alkali metal or an amine, and examples thereof include potassium chloride and sodium chloride.

The moisturizing agent imparts moisturizing property to the skin after washing, and examples thereof include polyoxyalkylene glycols such as glycerin and propylene glycol.

The surfactant is used as an auxiliary agent for improving the foamability and wettability of the composition. For example, any of anionic surfactants, nonionic surfactants and amphoteric surfactants can be used. Surfactants can also be used. Specifically, anionic surfactants such as sulfate ester salts, sulfonate salts and phosphate ester salts,
Examples thereof include polyethylene glycol type and polyhydric alcohol type nonionic surfactants, and amino acid and betaine type amphoteric surfactants.

The builder improves the detergency of the composition. For example, an organic builder (sodium citrate,
And sodium acrylate) and inorganic builders (sodium tripolyphosphate, sodium silicate, etc.).

Further, a dye or a fragrance may be added in order to impart appearance or fragrance.

[0021]

The liquid soap composition of the present invention has weak skin irritation and excellent fluidity even at low temperatures. Therefore, even in winter, for example, it can be easily spread on the hands, face and body for washing. Since the cleaning ingredients are the same as those of conventional soap, they do not get wet after being rinsed with water, resulting in a refreshing finish. The present invention will be further described below with reference to examples.

[0022]

[Examples] The nominal compositions of Examples 1-10 and Comparative Examples 1-5 were prepared by the following methods. The alkaline agent was dissolved in water in a vessel equipped with a stirrer, heated to 60 to 80 ° C., and the molten fatty acid was added with stirring to neutralize (the end point of neutralization was confirmed with phenol red or phenolphthalein). If necessary, a chelating agent, an electrolyte, a moisturizing agent, etc. were added after the complete neutralization to obtain a product. Urea, bactericide and anti-inflammatory agent were added to the product after cooling to room temperature. The composition of each composition is shown in Tables 1-3.

[0023]

[Table 1]

[0024]

[Table 2]

[0025]

[Table 3]

The physical properties of the obtained composition were measured, and the results are shown in Tables 4-6.

[0027]

[Table 4]

[0028]

[Table 5]

[0029]

[Table 6]

Claims (1)

[Claims] 1. One or more carbon atoms having 12 to 18 carbon atoms
100 parts by weight of the fatty acid salt and 0.5 to 35 parts by weight of urea, at least a part of the alkali forming the fatty acid salt is an alkanolamine, and the pH is 7 to 7.
A liquid soap composition which is 9.