JPS5946482B2 - First liquid for permanent wave - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a permanent wave liquid which is highly safe and has an excellent wave finishing effect.

Generally, thioglycolate is used as the main ingredient of permanent sea urchin liquid, but thioglycolate has a strong effect on hair and skin, easily causing hair breakage, hair discoloration, etc. It easily damages the scalp and often causes dandruff and hair loss.

Therefore, recently, instead of this, products containing 2 to 15% by weight of cysteine, a type of natural amino acid, as a main ingredient have been used.

Cysteine does not have a bad odor, has almost no adverse effect on the scalp, and has a mild effect on hair, so it can be used relatively safely even on weak hair, and the finish after treatment is similar to that of thioglycolate. It is attracting attention for its ability to create more natural waves.

However, cysteine has the disadvantage of being easily oxidized in its free state, especially in its aqueous solution, so it is usually supplied in the form of a hydrochloride salt that is relatively resistant to oxidation. However, it has been difficult to maintain the reducing power for a long time after preparation.

The present inventor conducted various studies to solve this problem, and
As a result, a permanent uniform solution containing 2 to 15% by weight of cysteine was diluted with basic amino acids to pH 7.0.
It has been found that by adjusting it to ~10.0, the reducing power of cis-imo-in can be fully exhibited and an excellent waving effect can be produced.

By using a basic amino acid as a pH adjuster, as shown in the experimental example below, there is almost no precipitation of cystine compared to conventionally used ammonia, and the solution stability is good. The unpleasant odor and skin irritation caused by this can be avoided, and it can be used safely, which is a practical advantage.

Examples of basic amino acids used as pH adjusters include lysine, oxylysine, arginine, histidine, ornithine, and lysine and arginine are particularly preferred.

In the present invention, the pH of the permanent waving solution containing cysteine as a main ingredient is adjusted using a basic amino acid alone, resulting in good solution stability and excellent wave forming ability. A better waving effect can be obtained when used in combination with other types of alkalis and amino acids.

That is, an aqueous solution containing 2 to 15% by weight of cysteine is first adjusted to pH 7.0 to 9.0 with a basic amino acid, and then ammonia, ammonium carbonate, alcohol amine (
For example, monoethanolamine, jetanolamine, triethanolamine, etc.) or a mixture thereof at pH 9,
It has been found that when adjusted to 2 to 9.7, a synergistic waving effect is exhibited due to the cooperative action of the basic amino acid and other types of bases.

The initial pH adjustment using basic amino acids and the final pH adjustment using other types of alkalis do not necessarily need to be performed sequentially, and can be added in any order as long as the required amounts of the basic amino acids and other types of bases are set. good.

Superfatting agents such as higher alcohols, surfactants such as N-acylamino acids, proline hydrolysates, lanolin, lecithin, hair nourishing agents, coloring agents, fragrances, etc., which are generally used in the permanent waving agent of the present invention, are not included. It is possible to form a permanent waving liquid in any form by appropriately blending.

A detailed explanation will be given below using experimental examples and formulation examples.

Experimental Example I A 50% aqueous solution of L-lysine or L-arginine dihydrate was added to an aqueous solution containing 5% by weight of L-cysteine to adjust the pH.
Table 1 shows the results of a wave forming force test conducted on samples obtained by adjusting the strength to 7.0 to 10.0.

For comparison, the same test was conducted on a sample whose pH was adjusted with 25% aqueous ammonia, and the results obtained are also shown in the same table.

The test method is to use thoroughly washed virgin hair (healthy hair) of approximately 0.5%. ! i' was wound in a loft with a tension of 70 g, and the sample 3a was applied to it and left for 15 minutes.

Then, 3rfLl of 8% Na, BrO3 aqueous solution was added to the solution.
Leave for 5 minutes to set the waves.

The wave diameter of one hair after washing with water and air drying is measured, and the wave effect at this time is calculated from the following formula, and the smaller the value, the better the result.

Experimental Example 2 Add L-arginine dihydrate or 50% aqueous solution of L-IJ resin to an aqueous solution with a concentration of 5% by weight of L-cysteine to adjust the initial pH to 7 to 9, and then adjust the final pH to 9.2 with 25% aqueous ammonia. , 9, 5, and 9.7, and a wave forming force test was conducted in the same manner as in Experimental Example 1.

The results are shown in Table 2.

For comparison, the pH was adjusted using L-arginine dihydrate,
The same table also shows the test results when the test was carried out using 50% L-IJ gin aqueous solution or 25% ammonia water alone.

Formulation example I L-cysteine 5.0% by weight L-arginine dihydrate 12.0 Glycerin
3.0 Water-soluble lanolin 3.0 Water
77.0 // In this formulation example, L-cysteine, glycerin, and lanolin are dissolved in water, and L-arginine dihydrate is added to the solution to adjust the pH.
Adjust to 9.0.

No crystal precipitation was observed in this product even after it was left at room temperature for 7 days.

In addition, as a result of the wave forming ability test, the waving effect was good and the hair felt good after permanent treatment.

Formulation example 2 L-cysteine 5.0% by weight 50%
L-lysine aqueous solution 18.0//glycerin
3.0 Collagen hydrolyzate 5.0 l/water
69.0% by weight In the above formulation example, L-cysteine, glyceris and collagen hydrolyzate were dissolved in water, and a 50% L-IJ gin aqueous solution was added thereto to adjust the pH to 9.2.

This product remained stable with no crystal precipitation even after being left at room temperature for 7 days, and the waving effect was also good.

The hair after permanent treatment also had good gloss and feel.

Formulation example 3 L-cysteine 5.0% by weight glycerin 3.0 Water-soluble lanolin
3. O〃L-arginine dihydrate
4.0 25% ammonia water 1.5
〃Water 83.5 // In this formulation example, L-cysteine, glycerin and water-soluble lanolin are dissolved in water, L-arginine dihydrate is added thereto to adjust the pH to 8.0, and then 25% ammonia is added. Adjust pH to 9.2 with water.

No crystal precipitation was observed in this product even after it was left at room temperature for 7 days, and a good waving effect was obtained in the waving force test.

Gives good gloss and feel to hair after permanent treatment.

Formulation example 4 L-cysteine 5.0% by weight water-soluble lanolin 3.0 Kola lily hydrolyzate 5.0 50% L-lysine aqueous solution
14.0//monoethanolamine 2
．． 0〃Wed 71.0
//In this formulation example, L-cysteine, water-soluble lanolin, and collagen hydrolyzate are dissolved in water, and 50%
% L-IJ gin aqueous solution is added to bring the pH to 9.0, and then adjusted to pH 9.5 with monoethanolamine.

This product remained stable with no crystal precipitation even after being left at room temperature for 7 days, and the waving effect was also good.

The hair after permanent treatment also had a good gloss feel.

Formulation example 5 L-cysteine 5.0% by weight glycerin 3.0 Coconut oil fatty acid sodium 3.0 50% L-lysine aqueous solution
14.0//25% ammonia water 2.
5〃Wed 72.5 /
/In this formulation example, L-cysteine, glycerin, and sodium coconut oil fatty acid are dissolved in water, and 50% L-cysteine is dissolved in water.
IJ gin aqueous solution was added to bring the pH to 9.0, then 25
The pH was adjusted to 9.5 with % ammonia water.

This product remained stable with no crystal precipitation observed even after being left at room temperature for 7 days, and had a large waving effect.

Gives good gloss and feel to hair after permanent treatment.

Claims (1)

[Claims] 1. A permanent wave liquid containing cysteine as a main ingredient with a basic amino acid at pH 7.0 to 10.0. A liquid for permanent waves characterized by being adjusted to. 2. The permanent wave liquid according to claim 1, wherein the basic amino acid is lysine or arginine. 3 Adjust the pH of the permanent wave liquid containing cysteine as the main ingredient to 7.0 to 9.0 with basic amino acids,
4. The basic amino acid is lysine or arginine, characterized in that the pH is adjusted to 9.2 to 9.7 with ammonia, ammonium carbonate or alcohol amine. Permanent wave number