JPH06256165A - Liquid detergent - Google Patents

Abstract

PURPOSE:To obtain a stable liquid detergent, having low irritancy to the skin, etc., high biodegradability and transparent at ordinary temperature without solidifying even at low temperatures and arousing any fear of environmental pollution. CONSTITUTION:This liquid detergent is obtained by blending 8.0-11.5wt.% potassium myristate with 5.0-8.0wt.% potassium palmitate and 14.2-40.0wt.% glycerol. All the respective ingredients have low irritancy to the skin, etc., and high biodegradability. Good transparency is obtained at ordinary temperature by providing the construction without solidifying even at low temperatures. Thereby, the liquid detergent excellent in stability can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid detergent which is highly safe and less likely to pollute the environment, and which is transparent at room temperature and does not solidify even at low temperatures. It is a thing.

[0002]

2. Description of the Related Art Soaps and various kinds of surfactants have been conventionally used in detergents in order to provide them with detergency and foamability. In recent years, liquid detergents have been used not only for hand washing but also for the body. In these cases, soap of fatty acid, monoalkyl sulfate such as lauryl sulfate, lauryl ether sulfate, α- Olefin sulfonate and the like were used.

However, the above soaps and surfactants have problems such as poor foam quality and strong irritation to the skin and eye mucous membranes. To improve these problems, amphoteric surfactants and nonionic surfactants are used. The use of agents is also planned.

Recently, coconut oil fatty acid methyl taurine salt, polyoxyethylene-added lauryl sulfosuccinate, imidazolinium betaine-based surfactants, etc. have been used as surfactants having low irritation to the skin.

[0005]

However, the above-mentioned mild surfactants have low biodegradability as compared with fatty acid soaps, and if a large amount of detergents containing them are provided and consumed. , There is a concern that it will pollute the environment.

On the other hand, lauryl sulfate, N-lauroyl-L-glutamic acid salt and the like, which are highly biodegradable surfactants, are highly irritating to the skin and are therefore safe to use. There was a problem. Regarding fatty acid soaps, some were highly irritating and some were poorly soluble in water, depending on the type of fatty acid. In addition, it was difficult to obtain satisfactory foaming properties.

Further, as an attempt to improve the solubility of the fatty acid soap, polyhydric alcohols such as dipropylene glycol and propylene glycol have been blended.
Few polyhydric alcohols are both biodegradable and irritant.

[0008] Usually, a bactericidal / preservative such as parabens and dehydroacetic acid is used to prevent contamination by microorganisms such as mold and bacteria. It is not preferable from the point of view.

The present invention solves the above problems and is a liquid cleaning agent which is less irritating to the skin and the like, is highly safe, has high biodegradability and is less likely to cause environmental pollution, and is transparent at room temperature. An object of the present invention is to provide a liquid detergent having excellent stability that does not solidify even at low temperatures.

[0010]

[Means for Solving the Problems] In order to solve the above problems, the present inventors have investigated a surface-active substance having low irritation to the skin and the like and high biodegradability.

The skin irritation was evaluated by the human patch test. 20% of 1.0% by weight of pure activator
The test subjects were occluded on their backs for 48 hours, the degree of stimulus reaction was evaluated according to the evaluation criteria shown in Table 1, and the total score of all the test subjects was divided by the number of test subjects to calculate 100 as the stimulation index. On the other hand, the biodegradability was evaluated by quantifying the amount of residual organic carbon after culturing for 14 days. The results are shown in Table 2.

[Table 1]

[Table 2]

As is clear from Table 2, among the surfactants investigated by us, potassium salts of myristic acid and palmitic acid were found to have both low irritation and good biodegradability.

Therefore, the incorporation of the potassium salt of the above fatty acid into the liquid detergent was examined. As described above, especially potassium palmitate has poor solubility in water, and in order to prevent it from solidifying at low temperature, a polyhydric alcohol was considered, and its irritancy and biodegradability were investigated. For biodegradability, the biological oxygen consumption (BO
It was evaluated by the measurement of D) and shown in FIGS.

As is clear from FIGS. 1 and 2, among the polyhydric alcohols, glycerin, sorbitol, ethylene glycol, propylene glycol and 1,3-butylene glycol showed good biodegradability. However, of these, propylene glycol and 1,3-butylene glycol have high skin irritation (Fragrance Journal, No. 2,
65-73, 1989), physical properties when blended with a cleaning agent,
Considering the feeling of use and the resistance to microbial contamination, glycerin was most suitable for the purpose of the present invention.

Therefore, by adding potassium myristate, potassium palmitate, and glycerin,
A liquid detergent having low irritation to the skin and having high biodegradability can be obtained.

Next, the blending amount of each of the above components was examined. After mixing and homogenizing the amounts of these ingredients in order, the pH was adjusted to 10.5 to prepare a liquid detergent, and the amount of each ingredient and the state of the detergent at room temperature and -5 ° C and the foamability were compared. The relationships were investigated and are shown in Table 3.

[Table 3]

As is clear from Table 3, when the amount of potassium myristate is 8.0% by weight or more, a proper foaming property is exhibited.
If it is added in an amount of 2.0% by weight or more, it will solidify at -5 ° C.
Further, when potassium palmitate was added in an amount of 5.0% by weight or more, the stability at low temperature was improved, but when it was more than 8.0% by weight, the foamability was lowered. Further, by adding 14.2% by weight or more of glycerin, transparency at room temperature can be obtained, but if it exceeds 40% by weight, stickiness in use occurs and it is not preferable. Therefore, in the present invention, potassium myristate is 8.0 to 11.
5% by weight, about 5.0-about potassium palmitate
8.0 wt%, for glycerin 14.2-40.
Add 0% by weight.

If free fatty acids are present in the product, turbidity or scenting will occur and the product value will be reduced. Therefore, it is preferable to adjust the pH of the liquid detergent to 10.0 or higher. Considering the stimulus, 11.0
The following is desirable.

[0019]

Therefore, according to the present invention, the specific fatty acid soaps potassium myristate and potassium palmitate are blended as the surface-active substance in an amount of 8.0 to 11.5% by weight and 5.0 to 8.0% by weight, respectively, Furthermore, in order to improve the solubility of potassium palmitate, glycerin is added to 14.2
~ 40.0% by weight.

By adopting such a constitution, the skin is not irritating, the biodegradability is high, the transparency is good, and the stability is high without solidifying even at a low temperature below the freezing point. A liquid cleaning agent can be obtained.

[0021]

EXAMPLES The present invention will be described in more detail with reference to Examples.

Table 4 shows the formulation of the liquid detergent according to the embodiment of the present invention. The components (1) to (6) shown in Table 4 were mixed and homogenized, and the total amount was adjusted to 100.0% by weight with purified water (6). The pH of this cleaning agent was 10.53. Table 5 shows the formulations of Comparative Example 1, Comparative Example 2 and Comparative Example 3. In the formulations of the examples shown in Table 4, those in which myristic acid, palmitic acid, and potassium hydroxide were replaced with sodium lauryl sulfate or sodium polyoxyethylene lauryl sulfosuccinate and dilauramide lauric acid were prepared as Comparative Examples 1 and 1, respectively. 2 and using propylene glycol in place of glycerin as Comparative Example 3,
Prepared as in the example.

[Table 4]

[Table 5]

Example, Comparative Example 1, Comparative Example 2 and Comparative Example 3
Table 6 shows the results of examining skin irritation, biodegradability, antibacterial activity, and stability.

[Table 6]

As is clear from Table 6, in the examples of the present invention, the stimulation index according to the human patch test is 0.
The skin irritation was low, and the biodegradability by quantifying the amount of residual organic carbon after 14 days of culture was 100%, indicating a good biodegradability. Further, it has strong antibacterial activity, shows good transparency at room temperature, and does not solidify even at -5 ° C.

On the other hand, although Comparative Example 1 has good biodegradability,
The skin irritation index was as high as 55.0, and the skin irritation was low in Comparative Example 2, but the biodegradability was low at a decomposition rate of 40.2% even after 14 days, and there was a concern about the effect on the environment. In Comparative Example 3, the biodegradability was good, but the skin irritation index was 32.5, which was high in skin irritation.

[0026]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, a highly stable liquid which has low irritation to the skin, high biodegradability, good transparency at room temperature and does not solidify at low temperature. You can get a cleaning fee. The liquid detergent according to the present invention also showed good antibacterial activity and did not cause the problem of contamination by microorganisms such as mold and bacteria.

[Brief description of drawings]

FIG. 1 is a diagram showing the biodegradability of polyhydric alcohol.

FIG. 2 is a diagram showing biodegradability of polyhydric alcohol.

[Explanation of symbols]

 1 Glycerin 2 Sorbitol 3 Polyethylene glycol (molecular weight 1000) 4 Pentaerythritol 5 Ethylene glycol 6 Propylene glycol 7 Diethylene glycol 8 1,3-Butylene glycol 9 Dipropylene glycol

Claims (2)

[Claims] 1. Potassium myristate is added to 8.0-11.
A liquid detergent comprising 5% by weight, 5.0 to 8.0% by weight of potassium palmitate, and 14.2 to 40.0% by weight of glycerin. 2. The liquid cleaning material according to claim 1, which has a pH of 10.0 to 11.0.