Hair straightener composition

Abstract

Provided is a hair straightener composition comprising a diamide compound (1) and an alkali agent and having a pH of from 12 to 14 when diluted to 10 times with water. wherein, R<1>: a C1-12 hydrocarbon group which may be substituted by a hydroxy and / or alkoxy group, R<2>: a divalent C1-5 hydrocarbon group, and R<3>: a divalent C1-22 hydrocarbon group. The hair straightener composition of the present invention causes little hair damage upon treatment therewith.

Description

[0001] The present invention relates to a hair straightener composition which causes little hair damage upon straightening treatment.[0002] A technique for straightening curly or frizzy hair can be classified according to a hair straightening agent to be employed. When a keratin reducing substance is used as a hair straightening agent for permanent straightening, the hair is straightened by applying the keratin reducing substance to the hair to cleave disulfide bonds therein, stretching the curly hair by combing and then applying an oxidizing substance to the hair to re-establish disulfide bonds. On the other hand, a hair straightener using a highly concentrated hydroxide (alkali agent) straightens the hair by converting disulfide bonds in the hair to lanthionine bonds by means of hydroxide ions, removing the remaining alkali by rinsing with water and shampooing, and then neutralizing the hair.[0003] Such a chemical change in the hair is caused by adjusting pH to about 9 in the case...

AI Technical Summary

Benefits of technology

[0004] An object of the present invention is therefore to provide a hair straightener which is reduced in hair damage caused by straightening treatment therewith.

[0017] When the hair straightener composition of the present invention is a "mixing type" composition, the diamide compound (1) serving as Component (A) can be incorporated either one or both of the relaxer composition and activating composition. Two or more of the diamide compound (1) serving as Component (A)compounds may be used in combination and its total content preferably falls within a range of from 0.01 to 30 wt. %, more preferably from 0.1 to 20 wt. %, especially preferably from 0.5 to 15 wt. % based on the total composition (the total amount of the two compositions in the case of the mixing type. This will equally apply hereinafter) from the viewpoints of sufficiently suppressing hair damage and avoiding deterioration in feeling upon use.

[0031] The emulsion is preferably added in an amount of from 5 to 40 wt. %, more preferably from 7.5 to 30 wt. %, especially preferably from 10 to 25 wt. % based on the whole composition from the viewpoints of stability and spreadability of the straighter composition and wettability of the hair.

Problems solved by technology

As a result, they have found that split or cut hair generates because the hair loses elasticity owing to the change in the bonding state in the hair and cuticles serving to protect the hair from physical or chemical stimulation tend to peel off easily.

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