Pressurized Foam Dyeing Process for Grey Hair Coverage
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Solution Overview
Problem
Existing hair dye compositions, particularly those using oxidation dyes, are oxidation-sensitive and prone to instability when exposed to atmospheric oxygen, leading to reduced shelf life and inconsistent color coverage, especially on grey hair.
Innovation Solution
A process involving a mixture of a dye composition containing oxidation dye precursors and a chemical oxidizing agent, both dispensed from pressurized containers, with the inclusion of a branched C6-C12 polyol, which forms a stable foam for application, maintaining color intensity and homogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If oxidation-sensitive dye compositions are stored in pressurized containers to prevent contact with atmospheric oxygen, then stability during storage is improved, but coverage of grey hair and galenical quality remain insufficient
Solution Approach 1:
The dye composition is divided into two separate pressurized containers: one containing the oxidation-sensitive dye precursors and the other containing the oxidizing agent. This segmentation prevents premature oxidation during storage while ensuring both components are delivered to the application site, resolving the contradiction between stability and effectiveness.
Solution Approach 2:
A foam-forming composition acts as an intermediary carrier that delivers both the dye precursors and oxidizing agent to the hair in a controlled manner. The foam matrix ensures proper mixing at the point of application while maintaining separation during storage, enabling effective grey hair coverage without compromising stability.
2Adaptability or versatility
If oxidation dyes are used to achieve varied colors through combination with couplers, then color variety is improved, but oxidation sensitivity increases leading to reduced shelf life
Solution Approach 1:
The oxidation dye system with multiple couplers for color variety is segmented into separate pressurized containers, with dye precursors in one container and oxidizing agent in another. This maintains the versatility of the dye system while preventing oxidation-related degradation during storage, thereby extending shelf life.
Solution Approach 2:
The pressurized containers create an inert environment that protects the oxidation-sensitive dye compositions from atmospheric oxygen during storage and application, preserving the integrity of the dye precursors and couplers until they are deliberately mixed at the point of use.
3Stability of the object's composition
If compositions are designed to be used quickly after opening to prevent oxidation, then stability is maintained, but ease of operation deteriorates due to rushed application
Solution Approach 1:
The pressurized foam delivery system enables continuous application of the dye composition from the moment of dispensing. The foam matrix ensures that the dye precursors and oxidizing agent are mixed and applied continuously without interruption, eliminating the need for rushed application while maintaining oxidation resistance.
Solution Approach 2:
The foam-forming composition self-mixes the dye precursors and oxidizing agent upon dispensing, and the pressurized system automatically controls the delivery rate. This self-service mechanism eliminates the need for manual mixing and timing management, improving ease of operation while maintaining stability.
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 process ensures long-lasting, uniform color application with improved coverage of grey hair, resistance to external agents, and prolonged stability of the dye product.
Implementation Method 1
at least one of which is conditioned in a pressurized container
Implementation Method 2
compositions, in particular compositions comprising oxidation dyes, are obviously oxidation-sensitive
Implementation Method 3
the said mixture being obtained from two compositions, at least one of which is conditioned in a pressurized container
Implementation Method 4
oxidation bases are colourless or weakly coloured compounds which, when combined with oxidizing products, can give access to coloured entities
Data Source
AI summary
The present invention relates to a process for dyeing keratin fibers in which a mixture is applied, this mixture being obtained from: •a dye composition comprising at least one oxidation dye precursor and at least a liquid fatty substance, and •an oxidizing composition comprising at least one chemical oxidizing agent, •at least one of the compositions being dispensed from a pressurized container, •the mixture of the two compositions comprising at least one branched C6-C12 polyol, and also to equipment suitable for performing this process.