Amphoteric Polymer Hair Dye Composition Reducing Scalp Irritation
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Solution Overview
Problem
Conventional hair dye and bleaching compositions using ammonia cause unpleasant odors, scalp discomfort, and damage to hair fibers, while alternatives like monoethanolamine may reduce ammonia exposure but still cause irritation and greater hair damage.
Innovation Solution
A composition comprising at least 0.15% neutralized fatty acid, non-ionic surfactants, non-associative amphoteric or cationic polymers, at least 10% fatty substances other than fatty acids, and an oxidizing agent, which minimizes ammonia release and scalp discomfort while maintaining effective coloring and bleaching properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ammonia is used as an alkaline agent in hair dyeing compositions, then effective coloring and lightening properties are achieved, but unpleasant odors and scalp irritation occur
Solution Approach 1:
The patent introduces a specific polymer complex as an intermediary substance that modifies the interaction between ammonia and the scalp. The polymer, with its specific molecular weight and charge characteristics, acts as a mediator that reduces ammonia's direct contact and harmful effects on the scalp while preserving its necessary alkaline function for hair coloring and lightening.
Solution Approach 2:
The patent changes the physical and chemical parameters of the alkaline environment by introducing a polymer that modifies ammonia's behavior. The polymer's presence alters the pH profile, ammonia release kinetics, and overall chemical environment, reducing irritation while maintaining coloring effectiveness.
2Reliability
If ammonia is used in hair dyeing compositions, then good coloring performance is achieved, but hair fiber damage increases over time
Solution Approach 1:
The patent applies beforehand cushioning by introducing a polymer that protects hair fibers from ammonia damage before the harmful effects can occur. The polymer forms a protective complex with ammonia, cushioning its harsh effects on the hair structure while allowing the necessary chemical reactions for coloring to proceed.
Solution Approach 2:
The polymer acts as an intermediary that facilitates the coloring reaction while protecting the hair fiber. It mediates between the alkaline agent and the hair structure, allowing color deposition while preventing excessive damage to the keratin framework.
3Object-generated harmful factors
If monoethanolamine is used to replace ammonia, then ammonia exposure is reduced, but scalp irritation and hair damage increase
Solution Approach 1:
The patent changes the chemical parameters of the alkaline system by using a polymer with specific molecular weight and charge characteristics. This parameter change creates a different chemical environment that reduces both ammonia exposure and scalp irritation simultaneously, unlike monoethanolamine which worsens irritation.
4Object-affected harmful factors
If conventional conditioning polymers are added to reduce scalp discomfort, then some comfort improvement is achieved, but polymer deposition on hair remains insufficient
Solution Approach 1:
The patent optimizes the polymer parameters including molecular weight, charge density, and chemical structure to achieve dual functionality. The specific parameter range enables the polymer to interact with both the scalp (reducing irritation) and the hair fiber (improving deposition and conditioning effects).
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 reduces scalp irritation and hair damage while maintaining strong, resistant colorations and satisfactory lightening of hair fibers, providing improved deposition of conditioning polymers and odor minimization.
Implementation Method 1
oxidizing compositions, more particularly for dyeing human keratin fibres, with dyeing compositions containing oxidation dye precursors, generally referred to as oxidation bases. These oxidation bases are colourless or weakly coloured compounds which, in combination with oxidizing products, give rise, by a process of oxidative condensation, to coloured compounds.
Implementation Method 2
the lightening of the fibre has the advantageous effect of bringing about a unified colour in the case of depigmented hair
Data Source
AI summary
The present invention relates to a composition for dyeing and/or bleaching human keratin fibers, such as the hair, comprising: a) at 0.15% of at least one neutralized fatty acid, please confirm the minimum amount of fatty acid salt in the ready to use composition b) at least one non ionic surfactant, c) at least one non associative polymer chosen from amphoteric polymers, cationic polymers and mixture thereof, d) at least 10% by weight relative to the total weight of the composition, of at least one fatty substance other than fatty acids, e) at least one oxidizing agent, and f) optionally at least one oxidation dye precursor and/or at least one direct dye. The invention also relates to a method for treating human keratin fibres using this composition.