Iso-Fatty Acid Surfactant Complex for Uniform Hair Dyeing

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Solution Overview

Problem

Chemical treatments for hair, such as permanent waving and bleaching, cause damage leading to uneven dyeing due to differences in damage levels between hair roots and tips, resulting in poor uniformity and durability of hair dye.

Innovation Solution

A two-part oxidative hair dye composition containing an iso-fatty acid or anteiso-fatty acid with 19-30 carbon atoms or its salt, combined with a quaternary cationic surfactant, which forms a firm complex with the hair, ensuring uniform dyeing and durability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If oxidative hair dye is applied to hair with different damage degrees (root vs tip), then the hair tip portion is dyed deeply but the hair root portion is poorly dyed, resulting in uneven dyeing

Engineering Contradiction:

Improvedyeing uniformityVSAvoiddyeing process simplicity

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The patent applies different functional components to different regions of the hair: quaternary cationic surfactants target damaged hair tip portions to reduce excessive dye penetration, while amino acid components address less damaged root portions to enhance dye uptake, achieving uniform dyeing across regions with different damage degrees

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The invention uses a composite formulation containing multiple active ingredients including oxidation dye intermediates, quaternary cationic surfactants, and amino acid components that work synergistically to address both damaged and undamaged hair regions simultaneously, resolving the uneven dyeing problem

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If chemical treatments (permanent waving, bleaching) are performed on hair, then the hair structure is altered and styled, but the hair becomes damaged and shows increased difference in damage degree between root and tip portions

Engineering Contradiction:

Improvehair styling capabilityVSAvoidhair damage

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful effect of damaged hair cuticles into a beneficial targeting mechanism: quaternary cationic surfactants specifically bind to negatively charged sites on damaged hair surfaces, allowing selective delivery of protective and dyeing components to damaged regions while sparing healthier areas

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The invention introduces amino acid components as intermediary substances that mediate between the dye and damaged hair structure, protecting the hair from further damage while facilitating uniform dye penetration through the altered hair cuticle layers

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If conventional hair dye compositions are used, then the dyeing process is simple, but the durability of the dyeing effect deteriorates after repeated shampooing

Engineering Contradiction:

Improvedyeing process simplicityVSAvoidcolor durability

Core Design Contradiction:

Ease of operationVSDuration of action of stationary object

Solution Approach 1:

The patent employs a composite system where quaternary cationic surfactants form stable complexes with amino acid components and dye molecules, creating a multi-component structure that resists washing out and maintains color durability through repeated shampooing while keeping the application process simple

Inventive Principle:

Principle #40Composite materials

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 composition achieves uniform hair dyeing and maintains color stability even after repeated shampooing, addressing the issue of uneven dyeing and damage caused by chemical treatments.

Implementation Method 1

at least one of the first agent and the second agent contains both of Component (A) and Component (B): (A) an iso-fatty acid or an anteiso-fatty acid having from 19 to 30 carbon atoms, or a salt thereof, and (B) a quaternary cationic surfactant

Methodology Applied

Scientific EffectComplex formation:

Implementation Method 2

forms a firm complex with the hair, ensuring uniform dyeing and durability

Methodology Applied

Scientific EffectAdsorption: Adsorption

Implementation Method 3

a two-part oxidative hair dye composition having a first agent containing an alkali agent and an oxidation dye intermediate or a direct dye and a second agent containing an oxidizing agent

Methodology Applied

Scientific EffectOxidation: Oxidation

Data Source

PatentEP2151233B1Two-component oxidative hair dye composition

Publication Date: 2017.08.09 KAO CORP

AI summary

Provided is a two-part oxidative hair dye composition having a first agent containing an alkali agent and an oxidation dye intermediate or a direct dye and a second agent containing an oxidizing agent, wherein at least one of the first and second agents contains both of Components (A) and (B): (A) an iso-fatty acid or an anteiso-fatty acid having from 19 to 30 carbon atoms, or a salt thereof, and (B) a quaternary cationic surfactant.