JPS5940198B2 - Improved solid detergent - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved solid detergent, and more particularly to an improved dissolution-resistant and non-stick solid detergent based on an N-long chain acyl acidic amino acid salt. It concerns detergents.

Solid detergents based on N-long chain acyl acidic amino acid salts have recently become widely used, and the following may be the reason for this. In other words, solid detergents based on N-long chain acyl acidic amino acid salts have excellent moldability, have good cleaning power not only in soft water but also in hard water, and when used, the aqueous solution exhibits weak acidity equivalent to that of the skin. This is thought to be due to the fact that it has excellent features not found in conventional solid detergents, such as being less irritating to the skin and leaving the skin feeling moisturized after use. In particular, for conventional solid synthetic detergents, moisturizers (e.g., 2-pyrrolidone-5-carboxylic acid and its salts, hydrolyzed protein, N-acetyl glycine salts,
Although it is customary to incorporate N-long chain acyl acidic amino acid salts (such as lactate or glutamate) as disclosed in JP-A-48-84108, solid detergents based on N-long chain acyl acidic amino acid salts The major feature of this product is that the base itself is mild and non-irritating to the skin, and it also leaves the skin with a moist feel after use, so there is no need to add a moisturizer as mentioned above. be. However, solid detergents based on N long-chain acyl acidic amino acid salts have the property of dissolving when they come into contact with water and damaging the shape of the solid detergent (hereinafter referred to as disintegrability), and they cannot be left in a soap box after use. Then, there is a tendency to adhere to the soap box (hereinafter referred to as adhesion). It has the disadvantage that it is difficult to remove it from the box when reusing it.
In solid detergents based on N long-chain acyl acidic amino acid salts, the drawbacks of high dissolution and adhesion impair the feeling of use and significantly reduce the commercial value of solid detergents. For this reason, improvements in melting resistance and non-adhesion properties have been strongly desired. Conventionally, a method of adding colloidal magnesium aluminum silicate to improve the dissolution resistance and non-adhesion of solid detergents based on N long-chain acyl acidic amino acid salts has been proposed (Japanese Patent Application Laid-open No. 49540
4) and a method of adding alkaline earth metal salts of N long-chain acyl acidic amino acids (see Japanese Patent Application Laid-open No. 50-16
However, the improvement effect was insufficient and a satisfactory solid detergent could not be obtained.

The present inventors conducted extensive research to improve the dissolution resistance and non-stick properties of solid detergents based on N long-chain acyl acidic amino acid salts, and found that the addition of certain amino acids and their salts is effective. We have discovered that this is the case, and have completed the present invention.

That is, the present invention is based on 40 to 99% by weight of at least one N-long chain acyl acidic amino acid salt, and 1 to 60% by weight of acidic amino acids, acidic amino acid salts, basic amino acids, and basic amino acid salts. The present invention provides a solid detergent with improved dissolution resistance and non-adherence, which is characterized by containing at least one modifier as a modifier.

The acyl group of the N long-chain acyl acidic amino acid salt used as the base of the present invention is preferably a saturated or unsaturated fatty acid residue having 8 to 22 carbon atoms, and the acidic amino acid and its salt each have asparagine It may be selected from acid, glutamic acid, and cysteic acid, and alkali metal salts such as sodium and potassium salts of these amino acids, ammonium salts, water-soluble amine salts 6 and basic amino acid salts such as lysine and arginine.

Each acidic amino acid serving as a raw material for the base may be either an optically active form or a racemic form. The modifier used in the present invention is selected from acidic amino acids, acidic amino acid salts, basic amino acids, and basic amino acid salts.

Aspartic acid and glutamic acid are used as acidic amino acids, and lysine, ornithine, arginine, etc. are used as basic amino acids. The acidic amino acid salts include alkali metal salts, ammonium salts, water-soluble amine salts, lysine, ornithine,
It can be selected from basic amino acid salts such as arginine. Examples of the basic amino acid salt include salts of acidic amino acids such as aspartic acid and glutamic acid, inorganic acid salts, and organic acid salts of the basic amino acids.

The amino acid used as the modifier of the present invention may be either an optically active form or a racemic form. The amount of the modifier of the present invention added is 1 to 60 wt% per solid detergent.

If the amount of the modifier added is less than 1 wt%, the effect of improving melting resistance and non-adhesion is small, and if it is more than 60 wt%, foaming,
The cleaning power decreases and a satisfactory solid detergent cannot be obtained. The solid detergent of the present invention may include a foaming enhancer,
Binder, fragrance, pigment, dye, and other auxiliary agents commonly used in solid detergents (see Japanese Patent Publication No. 3710167) may be added as appropriate. To produce the solid detergent of the present invention, an appropriate amount of water is added to a mixture of a base, a modifier, and auxiliary agents as necessary, and the mixture is kneaded with a roll and/or pelletizer and molded. It is sufficient to adopt the machine kneading method used in soap manufacturing.

The solid detergent of the present invention produced in this way has the following excellent performance. (1) Even if it is left in the soap box after use, it will not stick to the soap box.

(2) It will not melt or crumble even if placed in a humid place.

(3) The frictional solubility is equivalent to that of cosmetic fatty acid soap,
It has a value that complies with JISK-3301 and is moderately soluble. (4) Gives the skin a soft feel similar to cosmetic fatty acid soap.

(5) It has good foaming power and detergency even in hard water.

(6) It is non-irritating, does not irritate the skin, and gives a moist feel to the skin after use.

(7) Since N long-chain acylamino acids and their salts have sterilizing power, they can be disinfected at the same time as cleaning.

(8) Provides a very fine creamy and desirable foam compared to the case of N long-chain acylamino acid or its salt alone. The present invention will be explained in more detail below using Examples.

All "parts" in the examples are parts by weight.Example 1 After thoroughly kneading the above formulation in a small roll, a bar-shaped detergent obtained by extruding it in a small soap extruder with a nozzle kept at 45°C It was molded using a molding machine.

The formulations of the following Examples, Comparative Examples, and Reference Examples are also Example 1
It was molded in the same way. Example 2 Examples 1 to 3 and Comparative Examples 1 to 3 prepared as described above
, and adhesion strength test for each solid detergent of Reference Example 1,
A dissolution test and a friction solubility test were conducted.

The results are shown in Table 1. The test methods are 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 CTIL on top of it, and
Leave it for 4 hours.

A hook with a spring balance with a maximum weight of 4 kg was hung on the wire of the adhesive terminal, the spring balance was pulled, and the scale on the spring balance when the adhesive terminal was separated from the solid detergent was read, and the value was taken as the adhesive strength. The measurement was repeated five times for each sample, and the average value was determined. (2) Dissolution degree test Pour 5ml of water into a plastic soap box measuring 621nm long x 45m11 x width 207nm, and add 50mm water inside it.
A solid detergent molded to a size of 35 x 10 mm and a weight of 207 mm was immersed, and after being left for 24 hours, the way the solid detergent crumbled was observed.

The evaluation method was as follows: 0 if the shape remained almost the same, △ if the shape was slightly collapsed, and X if the shape was 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).

The results are shown in Table 1. The solid detergents of Examples 1 to 3 foamed well, gave a moist feel to the skin after washing, were less irritating, had excellent non-stick properties and disintegration resistance, and had good friction solubility.

Example 4 Table 2 shows the results of measuring the adhesion strength, degree of dissolution, and frictional solubility of each of the solid detergents of Examples 4 to 9.

Claims (1)

[Scope of Claims] 1. A base consisting of 40 to 99% by weight of at least one N-long chain acyl acidic amino acid salt, and 1 to 60% by weight of an acidic amino acid, an acidic amino acid salt, a basic amino acid, and a base. at least one selected from the group consisting of amino acid salts
1. A solid detergent having improved disintegration resistance and non-adherence, characterized by comprising a modifier consisting of seeds. 2. The solid detergent according to claim 1, wherein the acyl group of the N-long chain acyl acidic amino acid salt is a saturated or unsaturated fatty acid residue having 8 to 22 carbon atoms. 3. The solid detergent of claim 1, wherein the N-long chain acyl acidic amino acid salt is selected from aspartate, glutamate, and cysteate. 4. The solid detergent according to claim 1, wherein the N-long chain acyl acidic amino acid salt is selected from alkali metal salts, ammonium salts, water-soluble amine salts, and basic amino acid salts. 5. The solid detergent according to claim 1, wherein the acidic amino acid and acidic amino acid salt are aspartic acid or glutamic acid and aspartate or glutamate, respectively. 6 The basic amino acid and the basic amino acid salt are each lysine, ornithine, or arginine, and
The solid detergent according to claim 1, which is a lysine salt, an ornithine salt, or an arginine salt. 7. The solid detergent according to claim 1, wherein the acidic amino acid salt is selected from the group consisting of alkali metal salts, ammonium salts, water-soluble amine salts, and basic amino acid salts. 8. The solid detergent according to claim 1, wherein the basic amino acid salt is selected from acidic amino acid salts, inorganic acid salts, and organic acid salts.