Hair Bleaching Mixture Stabilizing Dyes at Reduced pH
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current hair bleaching methods often result in unwanted color shifts towards yellowish or reddish nuances, especially when bleaching dark hair, due to uneven destruction of melanin pigments, and existing toning agents are not stable enough to counteract these shifts effectively, requiring separate bleaching and toning steps.
Innovation Solution
A method involving a mixture of an oxidizing agent preparation, a bleaching powder, and a coloring preparation with a halogenated substantive dye and complexing agent, all at a reduced pH, to stabilize the dyes and achieve a one-stage bleaching process that balances color without unwanted warm tones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high pH values (9-10.5) are used to ensure cuticle opening and hydrogen peroxide penetration, then bleaching effectiveness is improved, but dye stability deteriorates
Solution Approach 1:
The patent applies parameter changes by reducing the pH of the coloring preparation from the conventional high pH (9-10.5) to a lower pH range (5-9). This parameter change stabilizes the dye molecules against oxidative degradation while the bleaching powder (containing persalts and carbonates) maintains adequate bleaching effectiveness. The modified pH parameter resolves the contradiction between bleaching effectiveness and dye stability.
2Manufacturing precision
If separate bleaching and toning steps are used to achieve color balance, then color control precision is improved, but process complexity increases
Solution Approach 1:
The patent merges the separate bleaching and toning steps into a single combined preparation that contains both bleaching agents (hydrogen peroxide, persalts, carbonates) and coloring agents (halogenated substantive dyes) at reduced pH. This unified formulation allows simultaneous bleaching and color balancing in one application step, reducing process complexity while maintaining color control precision through the synergistic interaction of components.
Solution Approach 2:
The combined preparation exhibits multi-functionality by performing both bleaching and toning functions within a single product formulation. The preparation can simultaneously lighten hair by destroying melanin pigments while depositing complementary colors to counteract unwanted warm tones, making the process universally applicable for both dark and light hair types without requiring separate specialized products.
3Stability of the object's composition
If halogenated substantive dyes are used at reduced pH, then dye stability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by reducing the pH of the coloring preparation from conventional high pH to a lower pH range (5-9). This parameter change stabilizes the halogenated substantive dyes against oxidative degradation, extending their shelf life and maintaining color performance. The reduced pH parameter directly improves dye stability while the formulation remains manufacturable using standard cosmetic production techniques.
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 method stabilizes the dyes, preventing color shifts and ensuring a consistent, silvery-cool bleaching result, improving storage stability and maintaining color performance even after prolonged storage, thus enhancing application comfort by combining bleaching and toning in a single step.
Implementation Method 1
The natural melanin dyes are destroyed by oxidative action and the fibers are thus decolorized
Implementation Method 2
at least one coloring preparation (C), containing in a liquid, cosmetic carrier at least one halogenated, substantive dye selected from the group consisting of tetrabromophenol blue and Acid Red 92, and additionally at least one complexing agent
Data Source
AI summary
Flowable agent (I), obtained by mixing (a) at least one oxidant preparation containing at least one oxidant in a liquid carrier, (b) at least one bleaching powder containing at least one bleaching booster and at least one solid alkalizing agent, and (c) at least one coloring preparation containing at least one halogenated, direct dye at a pH of less than 10, in a liquid carrier, is claimed. Independent claims are included for: (1) a method comprising applying (I) on human hair, leaving the hair for a period of 2-60 (preferably 5-45) minutes, and washing the hair with water and/or rinsing the hair with a shampoo; and (2) a multi-component packaging unit (kit-of-parts) comprising at least three separate containers, where the first, second and third containers contain (a), (b) and (c), respectively.