JPS6127439B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a cream-like (including foam-like) detergent composition among detergents commonly referred to as soaps intended for cleaning the face or body. Conventionally, in many soaps containing alkali metal salts of linear higher fatty acids, the alkali metal salts of higher fatty acids having 12 carbon atoms are considered to be important and essential for lathering. If it is not used, there will be a major disadvantage in terms of the quality of the soap product, and it has been said that there will be many difficulties in supplementing this with other active agents and active aids. However, in recent years, linear higher fatty acid salts having 12 carbon atoms have been considered to be one of the substances that cause skin irritation in soaps, and for the skin, it is preferable not to use them or to reduce their use. Therefore, it is desired to develop a soap composition with excellent lathering properties without using linear higher fatty acids having 12 carbon atoms, that is, without containing alkali metal salts of linear higher fatty acids having 12 carbon atoms. Tsuga Tokuko 1977
-Disclosed in Publication No. 20632. The soap composition disclosed in this publication consists of tallow fatty acids, i.e. fatty acids of the type that can be prepared from beef tallow, mutton tallow, lard, herb oil and certain edible butters, and a carbon number 11.
Produced in combination with ~15 branched higher fatty acids,
It is said to foam well and is economically superior. However, this soap composition is limited to bar-shaped, tablet-shaped, powdered, and liquid soap compositions, and there is no knowledge of cream-shaped (or foam-shaped) soap compositions, which have completely different properties. The present invention has been made in view of the above, and provides a cream-like (or foam-like) soap that has stickiness (elasticity), hardness, and fineness, has good lather, and is less irritating to the skin, that is, a cream. The purpose of the present invention is to provide a cleansing composition. In the present invention, "cream-like" refers to a product that is generally described as cream-like in terms of hardness, viscosity, appearance, feel, etc., like a cosmetic cream, and includes a product that is appropriately used in a foam-like container. The "cleaning composition" of the present invention has an emulsion-like or cream-like form when mixed with a gas or volatile substance, and a foam-like form when used. In addition to soaps for cosmetics, shaving, and medicinal purposes, it also includes soaps such as shampoo. In addition, the term "soap" refers to water-soluble salts of higher fatty acids,
In particular, cleaning agents containing alkali metal salts such as potassium salts and sodium salts are meant. The creamy detergent composition according to the present invention is obtained by neutralizing an oil layer consisting of a linear higher fatty acid and a branched higher fatty acid with an aqueous layer containing an alkali,
The branched higher fatty acid in the oil layer has 16 to 20 carbon atoms and has a ratio of 100:1 to straight chain higher fatty acid.
It is characterized by having a composition ratio of 1:1 and a blending ratio of 0.2 to 20% by weight based on the total amount of the oil layer and water layer. That is, for example, in the conventional soap disclosed in the above-mentioned Japanese Patent Publication No. 47-20632, branched higher fatty acids having carbon numbers in the range of 11 to 15 are selected in order to improve the foaming properties, and in addition, cream-like (or foam-like) soaps are used. ) was not found to produce good foaming, whereas the present invention has a carbon number that is considered undesirable in conventional soaps other than cream (or foam) in order to impart foaming properties.
A major feature of this product is that by applying 16 to 20 branched higher fatty acids to a cream (or foam) soap in a predetermined amount, a unique foaming effect that can be called an exceptional effect is obtained. are doing. Therefore, in the present invention, branched higher fatty acids having carbon atoms other than 16 to 20 are foamed as essential components, and furthermore, they are not used for safety reasons. Here, the branched higher fatty acids having 16 to 20 carbon atoms that are applied to the present invention include 2-hexyldecanoic acid (C16), 2-methylhexadecanoic acid (C17), 2-
Ethyl-2-methyltetradecanoic acid (C17), 2
-heptyl-undecanoic acid (C18), 5,7,7
-trimethyl-2-(1,3,3-trimethylbutyl)-octanoic acid (C18), 2-propylhexadecanoic acid (C19), 2-methyl-9-octadecenoic acid (C19), 2-octyldodecanoic acid, etc. Straight chain branched or branched ones are exemplified.
In addition, branched higher fatty acids have α-branched positions, as well as
Although β-branched and γ-branched ones are acceptable, α-branched ones are advantageous when considering actual industrial merits. Among these branched higher fatty acids, those with an even number of carbon atoms are generally obtained by oxidizing alcohol produced by the oxo method or Guerbet method, and those with an odd number of carbon atoms are generally used. Those obtained by the Kotsuho method and the radical reaction method of alkyl acetic acid are used, but the former is preferred in the present invention. However, branched higher fatty acids obtained by means other than those described above may be used as long as they can ultimately be understood as the same substance. In addition, examples of linear higher fatty acids applicable to the present invention include myristic acid, palmitic acid, stearic acid, oleic acid, and behenic acid, which are commonly used in conventional soaps, and one or more of these However, it is desirable to suppress the amount of lauric acid, which has 12 carbon atoms, for the reasons mentioned above. The water layer for neutralizing the oil layer consisting of these linear higher fatty acids and branched higher fatty acids having 16 to 20 carbon atoms to obtain the creamy soap according to the present invention is made of potassium hydroxide, sodium hydroxide, etc. It is composed of an alkali for neutralization and water for making these alkalis into an aqueous solution and giving the resulting creamy soap appropriate fluidity as a cream. Note that it is desirable to suppress the use of organic bases such as ethanolamine in consideration of safety. In addition, glycerin can be added to the water layer as a heat insulating agent from the viewpoint of physical properties such as tactility during use, and propylene glycol, 1,3-butylene glycol, polyethylene glycol, etc. can be used in addition to or in place of glycerin. Water also has the function of increasing the solubility of these substances. In the present invention, the branched higher fatty acid is used in a blending ratio of 0.2 to 20% by weight based on the total amount of the oil layer and the water layer, and 100:1 to 100:1 to the linear higher fatty acid used in combination. It is necessary to have a composition ratio of 1:1, preferably 80:1 to 4:1, and by neutralizing such an oil layer with a water layer, the desired creamy soap can be obtained. be. At that time, the total amount of straight chain higher fatty acids and branched higher fatty acids is blended in a range of 25 to 50% by weight, preferably 30 to 45% by weight based on the total amount of the oil layer and the water layer,
Furthermore, in order to obtain the properties of the soap of the present invention, it is appropriate to neutralize these with the alkali in the aqueous layer to a neutralization rate of 50% or more. However, these values are not important, and slight errors do not have a large effect on the properties. In the present invention, the alkali metal salt and free fatty acid are optionally present depending on the neutralization rate of the alkali. That is, the higher the neutralization rate, the more alkali metal salts will be present in the composition. For example, when the neutralization rate is 100%, almost all of the composition will be alkali metal salts. Next, in order to prove the unique foaming of the cream soap of the present invention, that is, the cleaning composition, 20 experts conducted a sensory evaluation and compared the results with conventional cleaning compositions in Table 1 ). In addition, the position of ○ in Table (1) indicates the average value of the evaluation results.
The evaluation method was to apply 1.0 g of the cleaning composition to the palm of your hand (in this case, wash it with bar soap in advance, wipe it dry with a towel), spread it well and lather for 1.5 minutes, then rinse your fingers until you have finished rinsing the foam. skin, eyes,
I followed the feeling in my palm. In addition, the evaluation items and their definitions are shown in Table (2), and the cream cleaning compositions that were evaluated were each
Proportions as shown in (3) and Table (4) (values are weight %)
After melting the oil layer and the water layer containing each component separately at 70℃ to 80℃, the water layer was added dropwise to the oil layer with sufficient stirring, and then the mixture was heated for 30 minutes while continuing to stir.
It is manufactured by cooling to ℃. Table (3) shows the conventional cleaning composition, and Table (4) shows the composition of the cleaning composition of the present invention.The mixture of straight chain higher fatty acids includes myristic acid (67%), palmitic acid (10%) with the composition of stearic acid (23%).

【table】

【table】

【table】

[Table] According to the evaluation results in Table (4) above, the creamy cleaning compositions F to I of the present invention all had a large amount of foam, the texture of the foam was creamy, and the hardness was elastic. In particular, it is clear that the effects of the present invention are particularly superior to conventional cleaning compositions A to C. In addition, conventional detergent compositions D and E are effective in terms of foaming amount, etc. However, as shown in Table (3), they have a problem with skin irritation due to the high concentration of laurate salts having 12 carbon atoms. . On the other hand, the present invention has excellent effects in terms of foaming amount, foam texture, foam hardness, etc., and is highly safe since it does not require the inclusion of laurates having 12 carbon atoms, which are less safe. This is clear from the safety test results shown in Table (5), and samples using linear higher fatty acids (lauric acid) have an extremely high positive rate and have safety problems, so they cannot be put to practical use. On the other hand, samples using branched higher fatty acids such as 2-hexyldecanoic acid had extremely low positive rates;
There is no problem in putting it into practical use. In addition, the positive rate shown in Table (5) is based on samples obtained by neutralizing 0.15 mol aqueous solutions of straight chain higher fatty acids and branched higher fatty acids such as A to E in Table (5) to 80% with cowrim hydroxide. This was used in 48 healthy men (block a) and 41
These are the results of a human body back test for a predetermined period of time on the subject (block b). However, the a block was 24 hours and the b block was 48 hours.

[Table] As is clear from the test results, Sample A using the conventional linear higher fatty acid (lauric acid) has an extremely high positive rate and has safety problems, and cannot be put to practical use. In contrast, samples B to E corresponding to the present invention
In the case of , the positive rate is extremely low and it is understood that there is no problem in use. As can be understood from the above evaluation and test results, it is obtained by neutralizing an oil layer consisting of straight chain fatty acids and branched higher fatty acids with an aqueous layer containing alkali.
The branched higher fatty acid contained in the oil layer has 16 carbon atoms.
~20 and 100:1 for straight chain fatty acids
According to the creamy cleansing composition of the present invention having a composition ratio of ~1:1 and a blending ratio of 0.2 to 20% by weight based on the total amount of the oil layer and the water layer, the composition has a composition ratio of ~1:1, and the composition has a composition ratio of 0.2 to 20% by weight based on the total amount of the oil layer and the water layer. Even without blending the problematic linear higher fatty acids with 12 carbon atoms, it lathers as well as or better than conventional soaps that mainly contain 12 carbon linear fatty acids, and therefore has a cleaning effect. It is possible to provide a detergent composition that is both excellent in safety and safety. In addition, its properties are completely different from conventional bar soaps, and the amount to be applied can be easily taken out of a tube-like container and used, making it convenient to carry, easy to lather, and anti-microbial after use. , it has excellent stain resistance and can fully contribute to adding value as a cosmetic product. Next, examples of creamy cleaning compositions according to the present invention will be shown. Incidentally, the blending ratio is in weight %. Example 1 (toilet soap)

[Table] After melting the oil layer A and the water layer B separately at 70° to 80°C, drop the water layer into the oil layer while stirring thoroughly.
Thereafter, the mixture was cooled to 30°C while stirring to obtain a cream-like toilet soap. Neutralization rate is 88%.

[Table] After melting the oil layer A and the water layer B separately at 70° to 80°C, drop the water layer into the oil layer while stirring thoroughly.
Thereafter, while stirring, the mixture was cooled to 30°C and filled into a container, and a gas was then mixed therein to obtain a foam-like beard soap. The neutralization rate is 91%.

[Table] After melting the oil layer A and the water layer B separately at 70° to 80°C, drop the water layer into the oil layer while stirring thoroughly.
Thereafter, the mixture was cooled to 30°C while stirring to obtain a creamy medicated soap. Neutralization rate is 86%. As a result of a use test conducted on 30 women for Examples 1 to 3 above, all of them produced a large amount of foam, the texture of the foam was creamy, the foam was firm and elastic, and there was no problem of skin irritation. There are almost no
It has been demonstrated that it can be used successfully.

Claims (1)

[Scope of Claims] 1. Obtained by neutralizing an oil layer consisting of a straight-chain higher fatty acid and a branched higher fatty acid with an alkali-containing aqueous layer, the branched higher fatty acid in the oil layer has 16 to 16 carbon atoms.
20 and 100 for straight chain higher fatty acids:
A cream-like detergent composition having a composition ratio of 1 to 1:1 and a blending ratio of 0.2 to 20% by weight based on the total amount of the oil layer and the water layer. 2. The composition according to claim 1, wherein the total amount of the linear higher fatty acid and the branched higher fatty acid is 25 to 50% by weight based on the total amount of the oil layer and the water layer. 3. The composition according to claim 1, which has a neutralization rate of 50% or more.