JPH02155992A - 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) (e.g. sodium salt of lauroylmethyltaurine).

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, although the problems such as free alkali are alleviated, the pH is still high; similarly, in the case of triethanolamine salts of fatty acids, the pH is lower than that of alkali metal salts of fatty acids, but is still around 9. Moreover, since anionic surfactants such as sodium lauryl sulfate have extremely strong detergency, there is a risk that the sebum film may 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]

In order to achieve the above object, the inventors of the present invention have conducted intensive studies and found that by blending a specific amount of a specific compound into a soap base, the detergent has excellent foaming properties and moderate cleaning properties. In addition to its properties, it also has good quality stability and formability, without the rancidity seen in conventional superfat soaps or the strength problems seen with sodium N-acylglutamate. In addition to being able to obtain 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 is based on 100 parts by weight of the soap base, expressed by the following general formula; The present invention relates to a hypoallergenic solid detergent characterized by containing 1 to 70 parts by weight of the compound.

[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 saponifying 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 soap base as described above is an alkali metal salt of N-acylmethyl tauric acid, and this compound is composed of, for example, fatty acid chloride and N-methyl tauric acid. sodium salt of
It can be obtained by reacting an alkali metal salt such as a potassium salt in the presence of an alkali. In addition, in the above general formula, R representing an alkyl group or an alkenyl group
The number of carbon atoms is 4 to 30, particularly preferably lO~2
2, and if it is outside this range, it will be difficult to obtain the effects of the present invention.

Specific examples of compounds represented by such general formulas include:
Examples include sodium lauroyl methyl taurate, sodium acyl (coconut oil) methyl taurate, potassium acyl (tallow) methyl taurate, sodium stearoyl methyl taurate, potassium oleoyl methyl taurate, and the like.

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).
The amount is preferably 0 parts by weight, particularly preferably 25 to 70 parts by weight. 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, Nishibetsu =
"Surfactant Handbook" (published by Sangyo Tosho Co., Ltd.), edited by Soft Giken Publishing Department, "Elucidation of the Functional Effects of New Surfactants and the Development and Practical Comprehensive Technical Data Collection of Applied Products" (Management Development Center Publishing Department) ) and the like are widely included.

In addition, the hypoallergenic solid detergent of the present invention can contain various polymeric substances in order to improve its shapeability, and may further contain chelating agents such as EDTA, humectants such as hyaluronic acid, and fragrances. Various additives such as dyes and the like 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 basic properties such as foaming properties, appropriate detergency, and formability, but also improves them. This makes it possible to obtain an unprecedented solid detergent that is hypoallergenic and gives 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 at 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 A1]. After making neat soap with a water content of about 30% by weight, 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, It was dried until the amount was about 14% by weight.

Next, this soap composition was applied to three rolls [manufactured by Ashizara 01; roll rotation speed 20 rpm, 48 rpm, 10107r].
It was made into flakes by adding titanium dioxide and fragrance in the proportions shown in Table 1, and then mixed in a kneader for 10 minutes.
The mixture was stirred for 3 minutes, then kneaded three times using the screw part of a laboratory soap extruder (manufactured by Sato Iron Works), extruded from the cone part, and stamped.
A hypoallergenic solid detergent of No. 7 was obtained.

Comparative Example A sample with a solid content of 8 to 1 O A cleaning agent was obtained.

The numbers in parentheses in the conventional formulations shown in Table 1 are the number of moles of ethylene oxide added. 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) was used to clean and rinse one arm with the sample and the other arm with a towel. After wiping it off, the usability of the left and right sides (smoothness during and after use) was judged as shown below.

◎... Very good usability (8 to 10 IOs answered that the usability of the sample side was good compared to the control.) ○... Good usability (6 to 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 the general formula or the compounding agents of the 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 an alkali metal) Characterized by blending 1 to 70 parts by weight of the compound Hypoallergenic solid cleaning agent.