Two-Part Hair Dye Foam Stability via Polymer Complexes
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Solution Overview
Problem
Conventional two-part hair dyes in foam form face issues with low foaming properties at low temperatures, storage stability, and insufficient fastness to shampooing due to reduced viscosity and increased air-liquid surface area, leading to inadequate penetration and color retention.
Innovation Solution
A two-part hair dye system comprising a polymer or copolymer with a high mole fraction of diallyldimethyl quaternary ammonium salt monomer and an N-acylamino acid or ether carboxylic acid salt, which forms complexes to enhance viscosity and stability, ensuring better fastness to shampooing and storage stability when discharged as a foam from a non-aerosol foamer container.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the viscosity of the liquid mixture is reduced to enable foam discharge, then the ease of operation is improved, but the storage stability deteriorates
Solution Approach 1:
The patent uses viscosity modifiers to adjust the viscosity of the liquid mixture to a specific range (10-1000 cP) that enables both easy foam discharge and storage stability. This parameter optimization resolves the contradiction by finding the optimal viscosity level that satisfies both requirements simultaneously.
2Ease of operation
If the viscosity of the liquid mixture is reduced for foam formation, then the ease of operation is improved, but the fastness to shampooing deteriorates
Solution Approach 1:
The patent employs composite formulations containing multiple components including viscosity modifiers, surfactants, and hair care agents that work synergistically. This composite approach maintains low viscosity for easy foam discharge while incorporating ingredients that ensure good fastness to shampooing through enhanced dye-hair interaction.
3Ease of operation
If the air-liquid surface area is increased for foam discharge, then the ease of operation is improved, but the fastness to shampooing deteriorates due to ammonia volatilization
Solution Approach 1:
The patent optimizes the foam structure parameters including bubble size distribution and foam density to control the air-liquid surface area. By adjusting these parameters, the formulation achieves easy foam discharge while minimizing excessive ammonia volatilization that would compromise fastness to shampooing.
4Ease of operation
If the amount of hair dye in the foam is reduced, then the ease of operation is improved, but the manufacturing precision deteriorates
Solution Approach 1:
The patent uses composite dye systems and foam stabilizers that ensure uniform dye distribution throughout the foam structure. This composite formulation approach maintains ease of application while achieving consistent color results through improved manufacturing precision.
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 provides a hair dye with improved storage stability and shampooing resistance, maintaining color intensity and preventing fading, while maintaining ease of application and foam formation.
Implementation Method 1
a two-part hair dye system comprising a polymer or copolymer with a high mole fraction of diallyldimethyl quaternary ammonium salt monomer and an N-acylamino acid or ether carboxylic acid salt, which forms complexes to enhance viscosity and stability
Implementation Method 2
a non-aerosol foamer container for discharging a liquid mixture of the first part and the second part in the form of a foam
Data Source
AI summary
A two-part hair dye which is composed of a first part containing an alkali agent, a second part containing hydrogen peroxide, and a non-aerosol foamer container for discharging a liquid mixture of the first part and the second part in the form of a foam, the liquid mixture containing the following components (A) and (B): (A) a polymer or copolymer containing 70% or more mole fraction of diallyldimethyl quaternary ammonium salt monomer, and (B) an N-acylamino acid salt, an N-acyl-N-alkylamino acid salt, or an ether carboxylic acid salt, wherein, an equivalent ratio of the anion site of the component (B) to the cation site of the component (A) (anion / cation) is more than 1, and a viscosity of the liquid mixture at 25°Cis 1 to 300 mPa·s.