JPS5942719B2 - Improved solid detergent - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improved solid detergents, and more particularly to N-long chain acyl acidic amino acid salts, N-long chain acyl neutral amino acid salts, N-long chain acyl basic amino acids and A group consisting of N- long chain acyl basic amino acid salts (hereinafter referred to as N-
The present invention relates to a solid detergent having improved dissolution and adhesion properties and is based on at least one type of long-chain acylamino acid salt (collectively referred to as a long-chain acylamino acid salt).

Recently, N-
Those based on long-chain acylamino acid salts are becoming widely used.

Unlike other synthetic detergents and fatty acid soaps, N-long chain acylamino acid salts are gentle on the skin and have excellent properties such as good detergency and foaming power even in hard water. In addition, other solid synthetic detergents and fatty acid soaps contain moisturizers such as 2-pyrrolidone-5-carboxylic acid and its salts, hydrolyzed proteins, N - Salts of acetylglycine, lactate or glutamate as disclosed in JP-A-48-84108 may be blended, but solid detergents containing N long-chain acylamino acid salts are used as moisturizers, etc. It is known that it gives a moist feel to the skin after use without adding any moisturizing ingredients. However, solid detergents using N long-chain acylamino acid salts have problems with dissolution and adhesion.

In other words, N long-chain acylamino acid salt solid detergents have the property of dissolving (dissolving) when they come into contact with water, damaging the shape of the solid detergent, and also sticking to the soap box when stored in the soap box after use. The tendency (adhesiveness) is large. Although the cause is not clear, it is thought to be due to the fact that the N long-chain acylamino acid salt has a highly hydrophilic amide group and amino group or carboxylate group in the molecule.
As a method for improving the dissolution and adhesion properties of N long-chain acylamino acid salt solid detergents, a method of adding colloidal magnesium aluminum silicate or N long-chain acylamino acid alkaline earth metal salt was disclosed in JP-A-49-5404. No. Publication,
Although disclosed in Japanese Patent Application Laid-open No. 50-160304,
The effect is insufficient. The present inventors have conducted extensive research to improve the adhesion and dissolution properties of solid detergents based on N long-chain acylamino acid salts, and have found that certain iminodicarboxylic acids are effective in improving these properties. They found that this is the case and completed the present invention.

That is, the present invention is characterized in that a N long-chain acylamino acid salt having an acyl group having 8 to 22 carbon atoms is used as a base, and iminodicarboxylic acid and/or a water-soluble salt thereof is contained as a modifier. The present invention provides a solid detergent with improved adhesion and dissolution properties.

The N long chain acyl amino acid salt used as a base for the solid detergent of the present invention includes N long chain acyl acidic amino acid salt, N long chain acyl neutral amino acid salt, N long chain acyl basic amino acid salt, and N long chain acyl basic amino acid salt. At least one type selected from the group consisting of long-chain acyl basic amino acid salts, and the acyl group is a saturated or unsaturated fatty acid residue having 8 to 22 carbon atoms.

The amino acids that are constituents of these bases include acidic amino acids such as aspartic acid, glutamic acid, cysteic acid, and homocysteic acid, neutral amino acids such as alanine, valine, methionine, glycine, sarcosine,
Leucine, phenylalanine, β-alanine, methyl-β-alanine, proline, etc., and basic amino acids,
Examples include lysine, ornithine, and arginine.
These amino acids that serve as raw materials for the base material may be either an optically active form or a racemic form. The salt of N long-chain acyl amino acid salt varies depending on the type of raw amino acid, but for example, salts of N long-chain acyl acidic amino acid salt and N long-chain acyl neutral amino acid salt include sodium, potassium, etc. There are alkali metal salts, ammonium salts, amine salts, and basic amino acid salts such as lysine and arginine.N long-chain acyl basic amino acid salts include alkali metal salts, ammonium salts, amine salts, and aspartic acid salts. , acidic amino acid salts such as glutamic acid, non-isolate salts such as hydrochloric acid and phosphoric acid, and isoasate salts such as citric acid and malic acid. These salts may be either mono-salts or di-salts. Base N long-chain acyl acidic amino acid salts, N long-chain acyl neutral amino acid salts, N long-chain acyl basic amino acids, and N long-chain acyl basic amino acids. The acyl basic amino acid salts may be used alone or in an appropriate combination of two or more types. The iminodicarboxylic acids used as the modifier of the present invention include iminodiacetic acid, iminodipropionic acid, and their Water-soluble salts such as alkali metal salts such as sodium and potassium salts, basic amino acid salts such as lysine and arginine, water-soluble amine salts such as triethanolamine, and ammonium salts.

These modifiers may be used alone or in an appropriate combination of two or more. The amount of modifier added in the present invention is preferably 1 to 60 wt% per solid detergent, and 1 wt%
% or less, there is little effect, and above 60 wt%, the cleaning power
A solid detergent with sufficient performance in terms of foaming, etc. cannot be obtained.

Note that adjuvants may be appropriately added to the solid detergent of the present invention depending on the purpose of use. The auxiliary agents are those commonly used in solid detergents, such as foaming enhancers, binders, fragrances, pigments, dyes, etc. as disclosed in Japanese Patent Publication No. 37-10167. The method for producing the solid detergent of the present invention includes:
The general method for soap production is to add an appropriate amount of water to a mixture of a base, modifiers, and auxiliary agents if necessary, knead the mixture with a roll and/or pelletizer, extrude it, and mold it. It is true. The solid detergent of the present invention thus produced has the following excellent performance.

(1) Even after being left in the soap box after use, there is no adhesion to the soap box when reusing it.

(2) Frictional solubility is equivalent to that of cosmetic soap, and JISK
-3301, melts appropriately during use, retains its shape well after use, and has a soft feel similar to that of cosmetic soap.

(3) Demonstrates good foaming and cleaning power even in hard water. (4) It is non-irritating, does not irritate the skin, and gives a moist feel to the skin after use.

(5) Since N long-chain acylamino acid salt has bacteriostatic activity,
Disinfection is carried out at the same time as cleaning.

(6) Gives a very fine creamy foam compared to the case of N long-chain acylamino acid salt alone.

Next, the present invention will be explained in more detail using practical examples, comparative examples, and reference examples. In the following examples, all parts are by weight. The above-mentioned mixture was sufficiently kneaded with a small roll, and then extruded with a small soap extruder with the nozzle kept at 45° C., and a bar soap obtained was molded with a foot-type molding machine.

The following actual examples, comparative examples, and reference examples were also molded in the same manner as this actual example 1. Example 2 Examples 1 to 3, Comparative Examples 1 to 3, manufactured in this way,
For the solid detergent of Reference Example 1, an adhesion strength test, a dissolution degree test, and a friction solubility test were conducted.

The results are shown in Table 1. In addition, each test method is as follows. (1) Adhesive strength test Wet the surface of the solid detergent with water, place a polyethylene adhesive terminal with a diameter of 2.5 CTL with a wire on it, and
Leave it for a while.

A hook with a spring balance with a maximum weight of 4 kg is placed on the wire of the adhesive terminal, the spring balance is pulled, and when the adhesive terminal is separated from the solid detergent, the scale on the spring balance is read, and that value is taken as the adhesive strength. The measurement was repeated five times for each sample, and the average value was taken. (2) Dissolution degree test Pour 5ml of water into a 1L plastic soap box measuring 627nm long x 45mm wide x 20ml deep, and pour 50ml of water into it.
A solid detergent molded to a size of ft x 35 mm x 10 mm 1 weight 209 was immersed, and after being left for 24 hours, the way the solid detergent crumbled was observed.

The evaluation method was as follows: ◯ indicates that the shape has remained almost the same, Δ indicates that the shape is slightly collapsed, and × indicates that the shape has completely collapsed.

The measurement was performed three times for each sample, and the evaluation was based on the average. (3) Friction solubility test Measured according to JISK-3304 (1956).

Practical Examples 1 to 3 and Comparative Examples 1 to 3 all foamed well;
It was also found to have good cleansing properties, giving a moist feel to the skin after washing, and being less irritating.

Practical Example 4 The adhesion strength, degree of dissolution, and frictional solubility of the solid detergents of Practical Examples 4 to 11 were evaluated in Examples 1 to 3, Comparative Examples 1 to 3,
Measurement was carried out in the same manner as in Reference Example 1.

The results are shown in Table 2. These solid detergents foam well, have good cleaning properties, and do not melt or crumble in water.
It was found that it gave a moist feeling to the skin after washing and was less irritating.

Claims (1)

[Scope of Claims] 1. Selected from the group consisting of N-long chain acyl acidic amino acid salt, N-long chain acyl neutral amino acid salt, N-long chain acyl basic amino acid, and N-long chain acyl basic amino acid salt. 1. A solid detergent, characterized in that the solid detergent contains at least one of the above solid detergents as a base, and contains iminodicarboxylic acid and/or a water-soluble iminodicarboxylic acid salt as a modifier in an amount of 1 to 60% by weight per solid detergent. 2 N-long chain acyl acidic amino acid salt, N-long chain acyl neutral amino acid salt, N-long chain acyl neutral amino acid, and N
- Long-chain acyl The solid detergent according to claim 1, wherein the acyl group of the neutral amino acid salt has 8 to 22 carbon atoms. 3 The acidic amino acid of the N-long chain acyl acidic amino acid salt is
At least one selected from the group consisting of aspartic acid, glutamic acid, cysteic acid, and homocysteic acid
The solid detergent according to claim 1, which is a seed. 4 The neutral amino acid of the N-long chain acyl neutral amino acid salt is
The solid detergent according to claim 1, which is at least one selected from the group consisting of alanine, valine, methionine, glycine, sarcosine, leucine, phenylalanine, β-alanine, methyl-β-alanine, and proline. 5. Claim 1, wherein the basic amino acid of the N-long chain acyl basic amino acid and the N-long chain acyl basic amino acid salt is at least one selected from the group consisting of lysine, ornithine, and arginine. Solid detergent as listed. 6. The N-long chain acyl acidic amino acid salt and the N-long chain acyl neutral amino acid salt are at least one selected from the group consisting of alkali metal salts, ammonium salts, amine salts, and basic amino acid salts. Claim 1
Solid detergent as described in section. 7 Salts of N-long chain acyl basic amino acid salts are alkali metal salts, ammonium salts, amine salts, acidic amino acid salts,
The solid detergent according to claim 1, which is at least one selected from the group consisting of inorganic acid salts and organic acid salts. 8. The solid detergent according to claim 1, wherein the iminodicarboxylic acid is iminodiacetic acid and/or iminodipropionic acid. 9. The solid according to claim 1, wherein the water-soluble salt of the iminodicarboxylic acid water-soluble salt is at least one selected from the group consisting of alkali metal salts, basic amino acid salts, ammonium salts, and amine salts. detergent.