Two-Part Foam Hair Dye Formulation for Stable Non-Aerosol Application
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Solution Overview
Problem
Conventional two-part foam hair dye products face challenges with foaming properties, storage stability, and fastness to shampooing due to their high air-liquid surface area and volatility of alkali agents, leading to uneven application and reduced dye penetration.
Innovation Solution
A two-part foam hair dye product formulation with a carboxylic acid anionic surfactant, a polymer or copolymer containing a high mole fraction of diallyldimethyl quaternary ammonium salt monomer, and an oxidation dye with a meta-dihydroxybenzene structure, combined with polypropyleneglycol, which improves storage stability and foaming properties while maintaining even application and dyeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a non-aerosol type foamer container is used to discharge liquid mixture in foam form, then ease of application is improved, but foaming properties deteriorate under specific conditions
Solution Approach 1:
The patent modifies the chemical composition parameters of the liquid mixture, specifically incorporating a cationic polymer with diallyldimethyl ammonium chloride monomer and controlling the anion/cation equivalent ratio to be 0.05 to 5. This parameter adjustment ensures stable foam generation from non-aerosol foamer containers under various storage and application conditions, resolving the reliability issue while maintaining ease of application.
2Ease of operation
If liquid mixture viscosity is reduced for even application, then ease of operation is improved, but storage stability deteriorates
Solution Approach 1:
The patent creates a composite liquid mixture formulation combining multiple components: oxidation dyes, coupling agents, cationic polymers with specific monomer content, and surfactants. This composite structure allows the mixture to maintain low viscosity (1 to 300 mPa·s) for easy and even application while the synergistic interactions between components provide storage stability, preventing separation or degradation during storage.
3Ease of operation
If foam form is used for application, then ease of operation is improved, but fastness to shampooing deteriorates
Solution Approach 1:
The patent introduces a cationic polymer containing diallyldimethyl ammonium chloride monomer as an intermediary substance. This polymer acts as a binding mediator that anchors the dye molecules to the hair keratin through electrostatic interactions. The polymer's cationic charges bind to the negatively charged hair surface, while also interacting with the dye molecules, creating a stable complex that resists removal during shampooing, thus improving fastness while maintaining the ease of foam application.
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 formulation achieves improved storage stability at low temperatures, enhanced foaming quality, and excellent fastness to shampooing, ensuring an evenly colored finish regardless of the shampoo used.
Implementation Method 1
the equivalent ratio of the anion site of the component (A) to the cation site of the component (B) (anion/cation) is more than 1
Implementation Method 2
a second part comprising hydrogen peroxide
Data Source
AI summary
A two-part foam hair dye which comprises a first part comprising an alkali agent, a second part comprising hydrogen peroxide, and a non-aerosol foamer container, wherein the first part comprises the components (A) to (D), an equivalent ratio of a anion site of the component (A) to a cation site of the component (B) (anion/cation) is more than 1, a mass ratio of a content of the component (C) to the content of the component (D) ((C)/(D)) is 5 or less, and the liquid mixture has a viscosity (25°C) of 1 to 300 mPa·s: (A) a carboxylic acid anionic surfactant, (B) a polymer or copolymer having a mole fraction of diallyldimethyl quaternary ammonium salt monomer of 70% or more, (C) 0.5 to 1.5% by mass of an oxidation dye having a meta-dihydroxybenzene structure, and (D) 0.1 to 9% by mass of polypropyleneglycol of Mw 200 to 1200.