JP-7857019-B2 - Multi-component hair cosmetic

JP7857019B2JP 7857019 B2JP7857019 B2JP 7857019B2JP-7857019-B2

Inventors

吉田瑞季

Assignees

株式会社ダリヤ

Dates

Publication Date: 20260512
Application Date: 20221108

Claims (2)

A multi-component hair cosmetic applied to hair whose pH has become 9 or higher due to dyeing or bleaching treatment with a hair dye or bleaching agent containing an alkaline agent, The aforementioned multi-component hair cosmetic comprises a first component and a second component, Both the first and second agents consist of (A) one or more selected from citric acid, glycolic acid, or levulinic acid. (B) Higher alcohols having an alkyl chain with 14 to 22 carbon atoms, (C) Contains one or more selected from stearyltrimethylammonium chloride or behenyltrimethylammonium chloride, Both the first agent and the second agent contain 1 to 5% by mass of component (A), The viscosity of the first agent at 20°C is 20,000 to 60,000 mPa·s. A multi-component hair cosmetic characterized in that the viscosity of the second component at 20°C is 65,000 to 100,000 mPa·s.
A hair treatment method for a multi-component hair cosmetic, applied to hair whose pH has become 9 or higher by dyeing or bleaching with a hair dye or bleaching agent containing an alkaline agent, The aforementioned multi-component hair cosmetic comprises a first component and a second component, Both the first and second agents consist of (A) one or more selected from citric acid, glycolic acid, or levulinic acid. (B) Higher alcohols having an alkyl chain with 14 to 22 carbon atoms, (C) Contains one or more selected from stearyltrimethylammonium chloride or behenyltrimethylammonium chloride, Both the first agent and the second agent contain 1 to 5% by mass of component (A), The viscosity of the first agent at 20°C is 20,000 to 60,000 mPa·s. The viscosity of the second agent at 20°C is 65,000 to 100,000 mPa·s, The process involves applying a hair dye or bleach containing an alkaline agent to the hair, leaving it on, rinsing it off, and then applying the first component of a multi-component hair cosmetic to the hair while it is still wet after the dyeing or bleaching treatment. Next, without rinsing off the first agent, the second agent of the multi-component hair cosmetic is applied to the hair. After applying the first agent and the second agent, a step of washing them off, The process of drying hair, A hair treatment method for a multi-component hair cosmetic consisting of the following.

Description

This invention relates to a multi-component hair cosmetic that offers good manageability during rinsing, emulsification stability, and application properties. Hair dyes or bleaches, which are formulated by mixing two or more agents at the time of use, are widely used as methods for dyeing or bleaching hair. These include hair dyes that combine a first agent containing at least an alkaline agent and an oxidative dye with a second agent containing hydrogen peroxide, two-part bleaches that use a first agent containing at least an alkaline agent and a second agent containing hydrogen peroxide, and three-part bleaches/decolorizers that combine a two-part bleach with a powder containing persulfate. The alkaline agent contained in such hair dyes or bleaches increases the pH inside the hair, opening the cuticle on the hair surface and allowing it to penetrate the hair shaft. Once inside the hair, the hair dye or bleach, using an oxidizing agent, oxidizes and decomposes the melanin pigment inherent in the hair, thus lightening the hair. In the case of hair dyes, the oxidative dye undergoes oxidative polymerization within the hair, forming a pigment that is fixed inside the hair shaft, thereby dyeing the hair. However, the alkaline agents contained in hair dyes or bleaches raise the pH of the hair, opening the cuticles on the hair surface and damaging both the surface and the interior. Furthermore, if alkaline agents remain on the hair, the damage to the surface and interior progresses further, resulting in rough, unmanageable hair. To address this, rinse-off hair cosmetics such as hair rinses, hair treatments, hair packs, and hair masks, as well as leave-in hair cosmetics such as hair oils, hair milks, hair creams, and hair mists, are commonly used (Patent Document 1). Japanese Patent Publication No. 2002-121121 The present invention will be described in detail below. Unless otherwise specified, all units indicating content are in mass percent. The present invention relates to a multi-component hair cosmetic that is applied to hair whose pH has been increased to 9 or higher by dyeing or bleaching with a hair dye or bleaching agent containing an alkaline agent. The aforementioned multi-component hair cosmetic comprises a first component and a second component, Both the first and second agents consist of (A) one or more selected from citric acid, glycolic acid, or levulinic acid. (B) Higher alcohols having an alkyl chain with 14 to 22 carbon atoms, (C) Contains one or more selected from stearyltrimethylammonium chloride or behenyltrimethylammonium chloride, Both the first agent and the second agent contain 1 to 5% of component (A), The viscosity of the first agent at 20°C is 20,000 to 60,000 mPa·s. The multi-component hair cosmetic is characterized in that the viscosity of the second component at 20°C is 65,000 to 100,000 mPa·s. The multi-component hair cosmetic in this invention, by being a multi-component formula comprising at least a first and second component, can effectively lower the pH within the hair compared to a single-component hair cosmetic. In the present invention, the multi-component hair cosmetic composition has a viscosity of 20,000 to 60,000 mPa·s for the first component at 20°C, making it easy to apply uniformly to the hair and preventing the first component from dripping. Furthermore, by setting the viscosity of the second component at 20°C to 65,000 to 100,000 mPa·s, the second component mixes easily with the first component on the hair to which the first component has been applied. The mixed first and second components are firmly retained on the hair, allowing for a further reduction in the pH within the hair. The multi-component hair cosmetic of this invention can lower the pH of hair that has reached 9 or higher due to dyeing or bleaching treatment with a hair dye or bleaching agent containing an alkaline agent, thereby smoothing the open cuticles on the hair surface and improving the manageability of the hair during rinsing. The first component of the multi-component hair cosmetic formulation in this invention will now be described. The first agent of the present invention contains (A) one or more selected from citric acid, glycolic acid, or levulinic acid, from the viewpoint of smoothness when rinsing. In the first agent of the present invention, component (A) is preferably citric acid, from the viewpoint of improving the smoothness of the hair when rinsing. The content of component (A) used in the first agent of the present invention is preferably 1 to 5%, more preferably 1.5 to 5%, and more preferably 2 to 4%. If the content of component (A) is less than 1%, the hair will not be smooth enough to comb through when rinsing. If the content of component (A) exceeds 5%, the emulsification stability will be poor. The first agent of the present invention contains (B) a higher alcohol having an alkyl chain with 14 to 22 carbon atoms, from the viewpoint of emulsification stability. The component (B)