JPH02155993A - Lowly irritant solid detergent - Google Patents

Abstract

PURPOSE:To obtain the title detergent which is very smooth to the touch during or after use and serves as a detergent suitable for those having a delicate skin by incorporating a specified amount of a specified compound into a soap base. CONSTITUTION:100pts.wt. soap base is mixed with 1-70pts.wt. compound of the formula (wherein R is 4-30C alkyl or alkenyl; M is an alkali metal, ammonia or a cation derived from a lower amine; n is 1 or 2) (e.g. Na salt of N-lauroyl- N-methylglycine).

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a hypoallergenic solid detergent, and more particularly to a hypoallergenic solid detergent prepared by blending a specific compound into a soap base.

[Conventional technology]

Conventionally, hypoallergenic solid detergents include soap-based detergents, such as superfat soaps made by adding an excess of saturated fatty acids after neutralizing or drying the soap, and triethanolamine salts of fatty acids. Salts with low pH are known. In addition, synthetic surfactants are used in combination with soap, such as near-neutral anionic surfactants such as sodium lauryl sulfate, and weakly acidic surfactants such as sodium N-acylglutamate. What has been done is known.

These hypoallergenic solid detergents are discussed in detail in, for example, ``Recent Hypoallergenic Soaps'' (Fragrance Journal, Vol. 47, p. 47, 1981).

[Problem to be solved by the invention]

However, these conventional hypoallergenic solid detergents are still not fully satisfactory in terms of hypoallergenicity. In particular, in the case of superfat soap, the pH is still high although the problems such as free alkali are alleviated, and similarly, in the case of triethanolamine salts of fatty acids, the pH is lower than that of alkaline earth salts of fatty acids, but the pH is still high. It is around 9,
Furthermore, anionic surfactants such as sodium lauryl sulfate have extremely strong cleaning power, so there is a risk that the sebum film will be washed away excessively.

For this reason, these conventional hypoallergenic solid detergents may feel slimy during use, or leave a feeling of stiffness or dryness after drying. The problem was that it was difficult to obtain.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional circumstances, an object of the present invention is to provide an improved, hypoallergenic solid detergent that can provide a very smooth feel during or after use.

[Means to solve the problem]

As a result of intensive studies to achieve the above object, the present inventors have found that by blending a specific amount of a specific compound into a soap base, they can achieve the original low foaming properties of detergents and a moderate level of foaming properties. In addition to its cleansing properties, it does not have the rancidity seen with conventional fat soaps or the strength problems seen with sodium N-acylglutamate, which means it has good quality stability and formability. In addition to obtaining a solid cleaning agent,
The present invention was completed based on the knowledge that this cleaning agent has improved hypoallergenicity compared to conventional cleaning agents, and therefore provides a very smooth feel during and after use. reached.

That is, the present invention applies the following general formula to 100 parts by weight of the soap base; 1 to 70 parts by weight of a compound represented by the following cation (n is 1 or 2).

[Structure and operation of the invention]

The soap base used in the present invention includes conventional soap bases such as animal and vegetable oils such as beef tallow, lard, coconut oil, palm oil, palm kernel oil, soybean oil, mixed fatty acids and simple fatty acids thereof. It includes a wide range of soaps made of various salts such as alkali metal salts, ammonium salts, and lower alkanolamine salts, which are obtained by resaponizing and neutralizing various oils and fats or fatty acids known as raw material components of agents. . Among these, soaps made of alkali metal salts such as sodium salts and potassium salts are particularly preferred.

In the present invention, the compound represented by the above general formula to be blended into the above soap base is a salt of N-acyl-N-methylglycine (n=1> in the general formula or N-acyl-N-
Salts of methyl-β-alanine (n-2 in the general formula), these compounds include, for example, fatty acid chloride and N-
By reacting methylglycine or N-methyl-β-alanine with an alkali metal salt in the presence of an alkali, or when making ammonia or a lower amine salt, it is then converted back to a carboxylic acid using sulfuric acid, etc. It can then be obtained by neutralizing with ammonia or lower amine.

In the above general formula, the number of carbon atoms of R representing an alkyl group or an alkenyl group is preferably in the range of 4 to 30°, particularly preferably 10 to 22. If it is outside this range, the effect of the present invention will not be achieved. It becomes difficult to obtain.

Furthermore, as mentioned above, M in the C00M group is a cation derived from an alkali metal, ammonia, or a lower amine, that is, sodium, potassium, NH, (
ammonium), lower alkanol ammonium, etc.

Specific examples of compounds represented by such general formulas include:
For example, the sodium salt of N-lauroyl-N-methylglycine, the sodium salt of N-oleoyl-N-methylglycine, the ammonium salt of N-oleoyl-N-methylglycine, the N-acyl(coconut oil)-N-methyl Potassium salt of glycine, N-acyl (tallow)-triethanolammonium salt of N-methylglycine, N-lauroyl-
Sodium salt of N-methyl-β-alanine, sodium salt of N-oleoyl-N-methyl-β-alanine, N-
Acyl (coconut oil)-N-methyl-β ~ sodium salt of alanine, N-acyl (beef tallow) potassium salt of N-methyl-β-alanine, N-acyl (beef tallow')-N-methyl-β
- Examples include ammonium salts of alanine.

In the present invention, the compounding amount of the compound represented by the above general formula is 1 to 7 parts by weight per 100 parts by weight of the soap base (dry soap).
0 parts by weight, particularly preferably N where n=l in the general formula
The amount is preferably 20 to 70 parts by weight for a salt of -acyl-N-methylglycine, and 5 to 50 parts by weight for a salt of N-acyl-N-methyl-β-alanine where n=2.

If this amount is too small, a hypoallergenic effect will not be obtained, and if this amount is too large, problems will arise in formability.

The hypoallergenic solid detergent of the present invention can be produced by uniformly mixing a soap base with a compound represented by the above general formula in the above ratio, and then extruding the mixture in a conventional manner.

At that time, the timing of addition of the above compound is not particularly limited, and it may be added to neat soap after neutralization, or may be added to soap chips after drying.

In the present invention, in order to uniformly mix the above-mentioned compound into the soap base, an appropriate surfactant may be used as necessary. This surfactant includes, for example, Nishibe:
"Surfactant Handbook" (published by Sangyo Tosho Co., Ltd.), "Elucidation of the functional effects of new surfactants and the development and practical comprehensive technical data collection of applied products" (edited by Soft Giken Publishing Department) (Management Development Center Publishing Department) A wide variety of known surfactants are included, such as those described in ).

In addition, the hypoallergenic solid detergent of the present invention can contain various polymeric substances in order to improve its formability, and may further contain chelating agents such as EDTA and moisturizing agents such as hyaluronic acid. Various additives such as fragrances, dyes, etc., which are added to ordinary soaps, may also be included.

〔Effect of the invention〕

As described above, in the present invention, by blending a specific amount of a specific compound into a soap base, it not only satisfies various properties such as foaming properties, appropriate cleansing properties, and shapeability, but also achieves improved properties. This makes it possible to obtain an unprecedented solid detergent that is hypoallergenic and provides a very smooth feel during and after use, making it suitable for people with sensitive skin, people with strong allergies, and people with sensitive skin. It is particularly suitable for people with weakened skin due to aging.

〔Example〕

EXAMPLES Below, the present invention will be explained in more detail by describing examples.

Example A 28% by weight aqueous sodium hydroxide solution was added to a mixture of beef tallow fatty acid and coconut oil fatty acid in a weight ratio of 80:20, and the mixture was stirred and mixed in a tabletop kneader with a capacity of 51 [manufactured by Irie Shokai]. , make it into a neat soap with a water content of about 30% by weight,
After adding the compound represented by the general formula shown in Table 1 below and other additive components in the proportions shown in the same table, the mixture was dried until the water content became about 14% by weight.

Next, apply this soap composition to three rolls [manufactured by Ashizawa ■;
Roll rotation speed 20rpa+, 48rpm,
107 rpm) to form flakes, add titanium dioxide and fragrance in the proportions shown in Table 1, stir in a kneader for 10 minutes, and then press the screw of a laboratory soap extruder (manufactured by Sato Iron Works). After kneading one portion three times, the mixture was extruded from the cone portion and molded to obtain hypoallergenic solid detergents of samples 1 to 7 according to the present invention.

Comparative Example Samples 8 to 10 of solids were prepared in exactly the same manner as in Example, except that in place of the compound represented by the above general formula, conventional compounding agents shown in Table 1 were used in the proportions shown in the same table. A cleaning agent was obtained.

Note that the numbers in parentheses in the conventional formulations shown in Table 1 are the added molar dispersion of ethylene oxide. Further, the blending ratio of each component shown in the same table is the number of parts by weight based on 100 parts by weight of the soap base (dry soap).

In order to evaluate the performance of each of the solid cleaning agents of the above Examples and Comparative Examples, usability tests were conducted in the following manner. The results were as shown in Table 1 below.

Usability test〉 Using each solid detergent as a sample, a panel of 10 people (5 men and 5 men in total) washed one arm of either the left or right with the sample and the other arm as a control, rinsed it, and washed it with a towel. After wiping off the water, the usability of the left and right sides (smoothness during and after use) was judged as follows.

■... Very good usability (8-10 out of 10 people answered that the usability of the sample side was better than the control) ○... Good usability (6-7 out of 10 people answered that the usability of the sample side was better than the control) Compared to the control, the sample side answered that the usability was good.) △... Usability was fair (4 to 5 people out of 10 answered that the sample side usability was good compared to the control.) ...Poor usability (0 to 3 out of 10 people answered that the usability of the sample side was better than the control.) The above control refers to the above-mentioned method of the present invention in the production of the solid cleaning agent described above. This is a cosmetic soap with a normal composition that does not contain any of the compounds represented by General 2 or the compounding agents of Comparative Examples.

As is clear from Table 1 above, the solid detergent in which a specific amount of the specific compound represented by the above general formula is blended into the soap base according to the present invention has a higher performance than the conventional solid detergent. It can be seen that the product provides a very smooth feel during and after use.

Furthermore, in the above usability test, it was simultaneously found that each solid detergent of the present invention satisfactorily satisfies all of the characteristics of foaming properties, appropriate detergency properties, and formability. did.

Patent applicant: NOF Corporation

Claims (1)

[Claims] (1) For 100 parts by weight of soap base, the following general formula; ▲
There are mathematical formulas, chemical formulas, tables, etc.▼ (In the formula, R is an alkyl group or alkenyl group having 4 to 30 carbon atoms, M is a cation derived from an alkali metal, ammonia, or a lower amine, and n is 1 or 2) A hypoallergenic solid detergent, characterized in that it contains 1 to 70 parts by weight of the compound represented by: