JPH0696508B2 - Hair dye - Google Patents

Description

TECHNICAL FIELD The present invention relates to a hair dye having excellent dyeing fastness and capable of uniformly dyeing hair in a short time.

(Prior Art) Conventionally used oxidative hair dyes have a risk of causing hair damage or primary skin irritation depending on how they are handled, because hydrogen peroxide acts under alkaline conditions during treatment. Therefore, hair dyes that use acid dyes and have little effect on the scalp and hair have been developed. However, currently, hair dyes using commercially available acid dyes have the drawback of low dyeing properties and dyeing fastness during washing.

In the past, when dyeing hair with an acid dye, it took about 30 to 50 minutes to complete the dyeing. During this time,
The subject must maintain the state of immovable and static seat as much as possible so that the dye solution does not scatter to the surroundings, and the mental and physical burden thereof is immeasurable. Therefore, if the time required for hair dyeing can be shortened as much as possible, there is nothing more comfortable for the person to be treated, and improvement thereof is widely demanded by consumers and the like.

In addition, as a method of shortening the time required for hair dyeing, a method of increasing the hair dyeing treatment temperature (cover the hair with a cap or the like while dyeing hair to keep the hair dyeing temperature required for a long time) and promote hair dyeing. It is known to add and use an agent (for example, styrene glycol), but the former method is very time-consuming and less effective, resulting in poor practicality. The latter method still produces sufficient effect. Has not been done.

DISCLOSURE OF THE INVENTION Therefore, the inventors of the present invention have conducted extensive studies in view of the above problems, and as a result, uniformly disperse or dissolve at least one of a specific organic solvent and a polymer compound described below in water, Furthermore, a hair dye in which an acid dye and an acid are mixed and the mixing weight ratio of the organic solvent and water is 5:95 to 80:20 is excellent in dyeing fastness and can be uniformly dyed in a short time. The present invention has been completed by finding that hair can be brushed.

(Object of the Invention) An object of the present invention is to provide a hair dye having excellent dyeing fastness and capable of uniformly dyeing hair in a short time.

(Structure of the Invention) That is, the present invention comprises: (a) at least one organic solvent selected from the group consisting of I-butanol, ethylene glycol monophenyl ether, ethylene glycol monobutyl ether, and O-methoxyphenol;
(B), xanthan gum, (c), acid dye,
A hair dye comprising (d), an acid, (e), and water, and the weight ratio of the organic solvent to water is 5:95 to 80:20.

(Detailed Description of Configuration) The organic solvent described in the present invention is a known substance, and the proper affinity and dispersibility in water of this organic solvent in the hair dye of the present invention are: It significantly improves the hair dyeing effect and dyeing fastness of the acid dye described below.

The content of the organic solvent is 3 to 80% by weight (hereinafter abbreviated as wt%) based on the total amount of the composition, either alone or as a total amount of two or more kinds. In addition, the blending weight ratio with water is the organic solvent:
Water = 5: 95 to 80:20, preferably 10:90 to 60:40.

When the blending amount of the organic solvent is other than the above-mentioned blending amount, the hair dyeing completion time described below is significantly delayed, the dyeing required time cannot be shortened, and the dyeing fastness is also significantly reduced, which is not preferable. .

Xanthan gum used in the present invention is D-glucose,
A polysaccharide composed of D-mannose and D-glucuronic acid,
Its composition ratio is generally 2.8: 2: 2, partially acetylated (about 4.7%) and contains about 3% pyruvic acid,
The molecular weight is said to be 10 ⁶ or more. For example, it is marketed under the trade name KELTROL from KELCO, Inc., USA. Xanthan gum, in the hair dye of the present invention,
It is excellent in that it is uniformly dissolved in water and the organic solvent is stably dispersed as fine particles. The blending amount of xanthan gum is 0.5 to 3.5 wt% (based on the total amount). 0.5wt%
If the amount is less than the above, it becomes difficult to stably and uniformly disperse the organic solvent, and if it exceeds 3.5 wt%, the viscosity of the hair dye becomes high, and the hair dyeing work is not easy, and the hair dyeing effect and the dyeing fastness are improved. Reduce it. The acidic dye used in the present invention is a known tar dye, and is roughly classified into a nitro dye, an azo dye, a nitroso dye, a triphenylmethane dye, a xanthene dye, a quinoline dye, an anthraquinone dye, an indigoid dye and the like. Can be mentioned.

The amount of the acid dye compounded is usually 0.01 to 20 wt% (based on the total amount).

Examples of the acid used for pH adjustment of the present invention include tartaric acid,
Examples thereof include organic acids such as acetic acid, citric acid and oxalic acid, and inorganic acids such as phosphoric acid and hydrochloric acid, but are not particularly limited thereto. The amount of the acid compounded is the amount necessary to adjust the pH of the composition to 1.2 to 4.0.

The blending amount of water used in the present invention may be 14 to 94 wt% (based on the total amount).

In addition, the hair dye of the present invention may contain a preservative, a chelating agent, a fragrance and the like in addition to the above-mentioned essential components as long as the stability of the system and the pH value are not impaired.

(Examples) The present invention will be described in more detail with reference to Examples below.
In addition, the test methods for the hair dyeing completion time (dying speed), hair dyeing effect, and dyeing fastness shown in the examples are as follows.

(1) Dyeing completion time (dyeing speed) test 2 g of a hair bundle (bundle of white hair) was immersed in a sample dyeing solution (30 ° C.) to impregnate the hair with the dyeing solution, and then at 30 ° C. It is left in a temperature-controlled room, taken out at regular intervals, washed with water, and air-dried. High-speed color difference meter (CMS-10 manufactured by Murakami Color Materials Co., Ltd.)
(00 type) is used to convert the X, Y, Z values of the dyed hair bundle into the L, a, b color system of Hunter, and the white hair bundle before dyeing is converted from the following formula. The color difference (ΔE) was measured, and the time when the color difference became almost constant (the inflection point of the color difference) was taken as the hair dyeing completion time. The smaller the displayed numerical value (the shorter the dyeing completion time (minute)), the faster the dyeing speed of hair.

(2) Hair dyeing effect test The hair dyed by three professional inspectors was visually inspected, and the uniformity (whether or not dyed uniformly) and the dyeing property (shading of dyeing) were examined.

(3) Dyeing fastness (washing fastness) test The dyed hair obtained in the hair dyeing completion time test of (1) above was treated with a 5% aqueous solution of sodium lauryl sulfate (30%).
℃), and after hand-washing 10 times,
It was washed with water and air dried. After repeating this 20 times, the fading rate after the hair wash test was calculated from the following formula.

A fading rate of up to 20% is "good", 21 to less than 50% is "poor",
50% or more was expressed as "remarkably defective".

Comparative Examples 1-2, Examples 1-5 In the following raw material compositions, the types and blending amounts of organic solvents and the blending amounts of water were blended as shown in Table 1 to prepare each hair dye. The properties prepared and obtained from the above-mentioned various tests are shown in the right column of Table 1.

(1) Composition (2) Preparation method Each of the hair dyes was prepared by uniformly dissolving the ingredients in the ingredients, adding the ingredients in this solution in order, and stirring and mixing the ingredients uniformly. The pH value of the obtained hair dye was in the range of 0.0 to 3.5.

(3) Characteristics As shown in the right column of Table 1, the compounding weight ratio of O-methoxyphenol, which is the organic solvent of Comparative Examples 1 and 2, and water is 5: 95-.
With a hair dye outside the range specified in the present invention of 80:20, the hair dyeing completion time required a long time, and good results were not obtained with respect to the hair dyeing effect and dyeing fastness.

The hair dyes of the present invention of Examples 1 to 5 had a compounding polymerization ratio of the organic solvent and water of 5:95 to 80:20, and clearly showed good properties in various tests.

Comparative Examples 3 to 6 and Examples 6 to 9 In the following raw material compositions, in the same manner as in the above Example 1,
Each hair dye was prepared and various tests were conducted. The pH value of each obtained hair dye was in the range of 2.5 to 3.0.

(1) Composition (2) Properties As shown in Table 2, hair dyes using ethanol and styrene glycol other than the organic solvent of the present invention of Comparative Examples 3 and 4, and hydroxy other than xanthan gum of the present invention of Comparative Examples 5 and 6. The hair dyes using high molecular compounds such as ethyl cellulose and carboxymethyl cellulose did not give good results in various tests.

The inventive hair dyes of Examples 6 to 9 showed good properties over all of the tests.

(Effects of the Invention) As described above, the hair dye of the present invention can dye the hair uniformly in a short time, shorten the dyeing time, and improve the dyeing fastness. The effects are remarkable, and the commercial value is extremely high.

Claims (1)

[Claims] 1. At least one organic solvent selected from the group consisting of (a), I-butanol, ethylene glycol monophenyl ether, ethylene glycol monobutyl ether, and O-methoxyphenol; and (b), xanthan gum; C), acid dye, (d), acid,
(E), water, and the weight ratio of the organic solvent to water is 5:95 to 80:20.