Oxidative Hair Dyeing Urea Developer Acceleration
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Solution Overview
Problem
Conventional oxidative hair dyes require long application times and struggle to effectively cover gray or white hair, often causing hair structure damage and undesirable color shifts.
Innovation Solution
A process involving an agent with a developer component and urea, applied in a cosmetic carrier for 1 to 10 minutes, which includes mixing a composition containing hydrogen peroxide to reduce exposure time and enhance color intensity on gray or white hair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional oxidative hair dyes are used for long application times, then color coverage and intensity on gray or white hair is improved, but hair structure damage increases
Solution Approach 1:
The patent changes the chemical parameters of the dyeing system by introducing a specific developer component (compound with formula I containing amino groups) and adjusting the oxidation mechanism. This allows effective gray coverage to be achieved in 1-10 minutes instead of 30+ minutes, reducing hair damage while maintaining color coverage reliability
Solution Approach 2:
The patent employs an accelerated oxidation process using a specific developer component that facilitates rapid dye formation on gray and white hair. The developer component (formula I) enables the oxidative dyeing process to proceed much faster than conventional systems, achieving effective coloring in 1-10 minutes without requiring prolonged exposure that would damage hair structure
2Reliability
If conventional oxidative hair dyes are used for long application times, then gray hair coverage is improved, but application time increases
Solution Approach 1:
The patent fundamentally changes the kinetic parameters of the oxidative dyeing process by introducing a novel developer component (formula I) that accelerates dye formation. This enables gray coverage to be achieved reliably in just 1-10 minutes, dramatically reducing application time compared to conventional 30+ minute processes
Solution Approach 2:
The patent utilizes an accelerated oxidation mechanism through the specific developer component that rapidly forms colored complexes on gray and white hair. This accelerated process maintains effective gray coverage while reducing the required application time from 30+ minutes to 1-10 minutes
3Duration of action of stationary object
If conventional oxidative hair dyes are used, then permanent coloring is achieved, but color intensity on gray or white hair is insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters by introducing a specific developer component (formula I with amino groups) that enhances dye formation on gray and white hair. This results in improved color intensity and permanence while maintaining the permanent coloring characteristic of oxidative dyes
Solution Approach 2:
The patent creates a composite dyeing system combining oxidation dye precursors with a specific developer component (formula I) and coupler components. This composite approach produces more intense and permanent color on gray and white hair by facilitating enhanced oxidative coupling reactions
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
This process significantly reduces the application time of oxidative hair dyes while maintaining or improving color coverage and intensity on gray or white hair, minimizing hair damage.
Implementation Method 1
The developer components form the actual dyes under the influence of oxidizing agents or atmospheric oxygen with one another or by coupling with one or more coupler components
Data Source
AI summary
The invention relates to an oxidative dyeing method for keratinous fibers, in which an agent containing at least one developer component and at least one special urea compound in a cosmetic carrier is left on the fibers for 1 to 25 minutes and is then rinsed off. The invention further relates to the use of said agent for reducing the time oxidative dyes are allowed to react on keratinous fibers and improving the color intensity of the dyes by means of oxidative dyes especially on gray or white keratinous fibers.