JPH03277698A - Solid detergent - Google Patents

Abstract

PURPOSE:To prevent swelling and cracking during use, protect the skin from chapping and improve the refreshness in make-up by providing a solid detergent containing a hardly water-soluble phosphate (hydrogen phosphate) of an alkaline earth metal in specific amount. CONSTITUTION:A solid detergent is blended with 0.1-15wt.% hardly water-soluble phosphate (hydrogen phosphate) of an alkaline earth metal (e.g. calcium hydrogen phosphate) with a particle size of 100mum or less.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a solid detergent, and more specifically, a solid detergent that prevents swelling (swelling) and cracking during use, and provides a light finish without making the skin rough. The present invention relates to a solid cleaning agent having the following properties.

[Conventional technology]

Solid detergents include soaps (alkaline salts of higher fatty acids), combinations that contain synthetic surfactants in soap, and simple bars that solidify synthetic surfactants with additives (binders).

Among these, soap is obtained by reacting mixed fats and oils such as beef tallow and coconut oil with an aqueous solution of caustic soda, or by neutralizing mixed fatty acids obtained by decomposing beef tallow, coconut oil, etc. with caustic soda, caustic potash, alkanolamines, etc. It is manufactured by adding fragrances, coloring agents, etc. to a soap base, but in recent years so-called super fat soaps containing free fatty acids have become mainstream.

In addition, as synthetic surfactants contained in converters and symptom bars, isethionic acid esters, alcohol sulfuric esters, alcohol phosphoric esters, N-anlglutamic acid salts, and the like are generally used.

Solid detergents are basically water-soluble, and therefore, when used repeatedly in bathrooms, washrooms, etc., they tend to absorb moisture, causing softening, melting, cracking, etc., which impairs the aesthetic appearance. have.

Furthermore, when this swelling occurs, it is not only difficult to use, but also has the disadvantage that foaming power and cleaning performance are reduced.

Until now, little research has been done to prevent solid cleaning agents from becoming soggy, melting, cracking, etc.
For example, Japanese Patent Application Laid-Open No. 58-167700 discloses a solid detergent containing a cationic polymer compound;
-199699 disclose solid detergents to which lactic acid or its salts are added, but since all of these additives are water-soluble, their effectiveness in preventing blistering, etc. is low.

On the other hand, mineral powders such as talc and kaolin are blended into solid detergents for the purpose of improving detergency and refreshing feeling.For example, in U.S. Pat. The cleaning agent was published in Japanese Patent Publication No. 5
8-191799, JP-A-6243497, JP-A-62-70308, etc. disclose solid detergents containing organic powder, but all of these have poor cleaning performance and light feeling. Although the properties have been improved, it has not been possible to prevent swelling, melting, and cracking.

[Problem to be solved by the invention]

Therefore, an object of the present invention is to provide a solid detergent that prevents blistering and cracking during use, does not cause skin roughness, and has a light finish.

[Means to solve the problem]

Under these circumstances, the present inventors conducted extensive research and found that the above problems could be solved by blending an alkaline earth metal salt of phosphoric acid or an alkaline earth metal salt of monohydrogen phosphate, which are poorly soluble in water. , completed the invention.

That is, the present invention uses an alkaline earth metal salt of phosphoric acid or an alkaline earth metal salt of monohydrogen phosphate, which is sparingly soluble in water, at 0.5%.
The present invention provides a solid detergent characterized by containing 1 to 15.0% by weight.

The alkaline earth metal salt of phosphoric acid or the alkaline earth metal salt of monohydrogen phosphate used in the present invention is not particularly limited as long as it is sparingly soluble in water, and specific examples include calcium phosphate, magnesium phosphate, and hydrogen phosphate. calcium,
Examples include magnesium hydrogen phosphate, and hydrates thereof.

The particle size of these alkaline earth metal salts of phosphoric acid or alkaline earth metal salts of monohydrogen phosphate is 100μ or less, especially 5
It is preferable that it is 0μ or less. If the particle size exceeds 100 μm, the roughness during use becomes significant, and the coarse particles cause roughness on the skin, which is not preferable.

In the solid cleaning agent of the present invention, the above-mentioned alkaline earth metal salt of phosphoric acid or alkaline earth metal salt of monohydrogen phosphate can be blended singly or in combination of two or more, and the amount of the alkaline earth metal salt is It is 0.1 to 15.0% by weight in the total amount, preferably 0.5 to 1090% by weight, particularly preferably 10 to 5.90% by weight.
It is 0% by weight. If the amount is less than 0.1% by weight, the effects of the present invention cannot be obtained, and if it exceeds 15.0% by weight, the solidity of the cleaning agent during production will deteriorate.

The solid detergent of the present invention can be produced by blending the above-mentioned alkaline earth metal salt of phosphoric acid or alkaline earth metal salt of monohydrogen phosphate with a conventional solid detergent.

In other words, if the solid detergent is soap, for example, first, beef tallow,
Animal fats and oils such as sheep tallow; vegetable oils and fats such as coconut oil, palm oil, palm kernel oil, soybean oil, olive oil, and cottonseed oil, either singly or in combination, are saponified with caustic soda, or these oils and fats are saponified with caustic soda. A soap base is produced by neutralizing each fatty acid obtained by decomposition or a mixture thereof with caustic soda, caustic potash, alkanolamine, etc. Next, an alkaline earth metal salt of phosphoric acid or an alkaline earth metal salt of monohydrogen phosphate may be added to the soap base, mixed, kneaded, extruded, and molded.

In the case of Combar, the above soap base contains α-sulfo fatty acid ester, isethionate ester, alkylaryl sulfonic acid, alcohol sulfate ester, alcohol ethoxylate sulfate ester, olefin sulfonic acid, paraffin sulfonic acid, alcohol phosphate ester, N −
Contains acylglutamic acid, salts of these esters and acids, alkylbetaine, sulfobetaine, etc.
Next, an alkaline earth metal salt of phosphoric acid or an alkaline earth metal salt of monohydrogen phosphate may be added and mixed, followed by kneading, extrusion, and molding.

Furthermore, in the case of a simple bar, the above-mentioned ester,
Acids, salts, higher fatty acids such as myristic acid, balmitic acid, stearic acid, etc. or higher alcohols such as myristyl alcohol, cetyl alcohol, stearyl alcohol, etc. are mixed with water as a binder, and the mixture is further cooled to form a veralet. Next, add an alkaline earth metal salt of phosphoric acid or an alkaline earth metal salt of monohydrogen phosphate to this,
Mixing, kneading, extrusion, and molding may be performed.

In addition to the above-mentioned ingredients, the solid cleansing agent of the present invention may optionally contain perfatty acids (higher fatty acids), humectants such as propylene glycol and glycerin, and other high-grade ingredients that are included in ordinary skin cleansers. Alcohol, other esters, oils such as silicone, fragrances, pigments, ultraviolet absorbers, antioxidants, bactericidal agents, preservatives, and the like can be blended.

〔Example〕

Next, the present invention will be further explained with reference to Examples.

In addition, in this example, the test for the degree of swelling and the
Evaluation of cracking and feeling of use (rough skin, light feeling) was performed as follows.

(1) Softness test Prepare a test piece of 1×1×5cm for each solid detergent,
Soak in water at 5°C for 4 hours. Take this out and use a rheometer (manufactured by Fudo Kogyo ■, NRM-2010J-CW)
, insert a needle-like indenter into the surface of the test piece, and press it for 10 minutes.
The distance from the surface when a drag of 0 g was obtained was measured, and the degree of softening was calculated using the following formula. The larger this number is, the more noticeable the degree of softening is.

Soaking degree (岨) = (penetration distance after dipping) - (penetration distance before dipping 1!31) (
2) Evaluation of Soaking Each solid cleaning agent was used in a bathroom under the same conditions for two weeks, and the condition thereafter was visually evaluated. The evaluation criteria are as follows.

◎: Not at all swollen ○: Not very swollen △: Slightly swollen
Soak in water at 5°C for 4 hours. Take this out and leave it at room temperature for 2
After drying for 4 hours, the cracked state of the sample was visually evaluated. The evaluation criteria are as follows.

◎: Not cracked at all 0: Slightly cracked △: Cracked A total of 10 and 10 panelists used the product to wash their bodies for one week, and evaluated the condition of their skin and the refreshing feeling.

Example 1 Soaps having the compositions shown in Table 1 below were manufactured in a conventional manner, and each soap was tested for degree of softening and evaluated for softening and cracking. The results are shown in Table 1.

The feeling of use (rough skin, light feeling) was good in all cases.

Margin Example 2 Combers or simple bars having the compositions shown in Table 2 below were manufactured by a conventional method, and each was tested for degree of softening and evaluated for softening and cracking. The results are shown in Table 2.

The feeling of use (rough skin, light feeling) was good in all cases.

Margins below [Effects of the Invention] The solid detergent of the present invention can be used continuously without causing any blistering or cracking, and also has a good feeling of use, such as not causing skin irritation and having a light finish. Therefore, it is very useful.

that's all

Claims (1)

[Claims] 1. A solid detergent containing 0.1 to 15.0% by weight of an alkaline earth metal salt of phosphoric acid or an alkaline earth metal salt of monohydrogen phosphate, which is poorly soluble in water.