Hair Shape Control Agent Using Bis(Nε-lauroyl-L-lysine)sebacoyl Amide
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Solution Overview
Problem
Existing hair treatments for permanent waves and curling cause damage to hair, leading to difficulty in maintaining shape and a degraded feeling of hair touch, especially with repeated bleaching and coloring treatments.
Innovation Solution
A composition containing a compound represented by formula (1) or its salt, used in combination with a reducing agent and an alkali agent, is applied to the hair to improve touch and maintain shape while reducing damage, specifically bis(Nε-lauroyl-L-lysine)sebacoyl amide or its salt, along with water, is used to enhance the hair treatment process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If reducing agents and oxidizing agents are used for permanent wave treatment, then hair shape control is achieved, but hair damage occurs and disulfide bonds are excessively oxidized
Solution Approach 1:
The patent introduces an intermediary substance that mediates between the reducing/oxidizing agents and the hair keratin. This intermediary protects the disulfide bonds from excessive oxidation while still allowing the shape control process to occur, thereby reducing hair damage during permanent wave treatment
Solution Approach 2:
The patent modifies the chemical parameters of the treatment process by controlling the oxidation level and using specific ratios of reducing to oxidizing agents. This parameter control prevents excessive oxidation of disulfide bonds to sulfonic acid groups, maintaining hair integrity while achieving shape control
2Shape
If disulfide bonds are reduced and reformed for permanent wave, then wave shape is formed, but hair damage accumulates with repeated treatments
Solution Approach 1:
The patent applies preliminary protective action before the permanent wave treatment by introducing substances that protect hair structure in advance. This preliminary protection prevents damage accumulation during repeated treatments while maintaining wave shape formation capability
Solution Approach 2:
The patent converts the potentially harmful oxidation process into a beneficial controlled reaction. By carefully managing the oxidizing environment, the disulfide bond reforming process is optimized to create stable wave shapes without causing cumulative damage that would prevent future treatments
3Shape
If sulfhydryl groups are formed by reduction, then disulfide bonds are cleaved for reshaping, but excessive oxidation occurs forming sulfonic acid groups
Solution Approach 1:
The patent precisely controls the oxidation parameters during the second agent application. By adjusting oxidation time, concentration, and temperature, the process stops at the desired disulfide bond reforming stage before excessive oxidation to sulfonic acid groups occurs, ensuring reliable shape maintenance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively improves the feeling of hair touch and maintains the shape of hair after treatments, reducing damage and sustaining the wave or curl for a longer period.
Implementation Method 1
the disulfide bond of keratin in the hair is reduced, that is, cleaved, by the reducing agent in the first agent to give a sulfhydryl group
Implementation Method 2
the cleaved disulfide bond is reformed at a new position by the oxidizing agent in the second agent to fix the shape
Data Source
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AI summary
Provided is a composition for controlling hair shape, which affords a superior feeling of hair touch (softness, smoothness, gathering property, gloss etc.), an effect of suppressing damage to the hair, forming a desired wave shape and the like, and sustaining the shape of the hair. A hair shape control assisting agent containing component (A): a compound represented by the formula (1) wherein each symbol is described in the SPECIFICATION, or a salt thereof.