Polysaccharide Dye Composition for Intense Keratin Fiber Coloration
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Solution Overview
Problem
Conventional direct dyeing processes for keratin fibers result in semi-temporary colorations with poor kinetics, reduced intensity, and homogeneity due to weak binding interactions, leading to less favorable results compared to oxidation dyeing methods.
Innovation Solution
A composition comprising a polysaccharide-type polymer, a solid fatty ether, and a direct dye or dye precursor, which provides powerful, chromatic, and selective coloration while maintaining the cosmetic integrity of the hair fibers, with a suitable texture for easy application and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional direct dyeing processes are used, then fiber integrity is protected, but coloration intensity and persistence are reduced
Solution Approach 1:
The patent uses a composite dyeing system combining direct dyes with polysaccharide polymers and fatty ethers. The polysaccharide polymer serves as a binding agent that forms a complex with the direct dye, while the fatty ether acts as a carrier. This composite approach allows the dye to bind more strongly and persistently to keratin fibers without compromising fiber integrity, resolving the contradiction between gentle direct dyeing and intense coloration.
2Ease of operation
If conventional direct dyeing processes are used, then application is simple, but coloration homogeneity is poor
Solution Approach 1:
The polysaccharide polymer acts as an intermediary between the direct dye and the keratin fiber. It facilitates more uniform distribution and binding of the dye across the fiber surface, improving coloration homogeneity. The fatty ether serves as a secondary intermediary carrier that enhances dye penetration. This intermediary mechanism maintains simple application procedures while significantly improving color uniformity.
3Manufacturing precision
If oxidation dyeing methods are used, then coloration intensity is improved, but fiber integrity is compromised
Solution Approach 1:
The patent converts the typically harmful oxidative process into a beneficial binding mechanism. Instead of using harsh oxidants that damage fibers, the system uses polysaccharide polymers that form gentle inclusion complexes with direct dyes. The fatty ether carrier facilitates controlled delivery. This approach achieves oxidation-like coloration intensity while preserving fiber integrity, effectively converting the harm of strong dyeing into the benefit of gentle complex formation.
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 composition achieves persistent, intense, and homogeneous coloration that withstands shampoo washing without impairing the hair's cosmetic properties, offering improved chromaticity and selectivity compared to traditional direct dyeing methods.
Implementation Method 1
The direct dyes may also be natural dyes. Conventional direct dyeing processes consist in applying to the keratin fibers dye compositions comprising direct dyes. After application, a leave-on time is observed so as to allow the dye molecules to penetrate by diffusion into the fibers.
Implementation Method 2
After application, a leave-on time is observed so as to allow the dye molecules to penetrate by diffusion into the fibers.
Data Source
AI summary
The present application relates to a dye composition comprising at least one polysaccharide-type polymer, at least one fatty ether that is solid at room temperature and atmospheric pressure, of formula R-O-R' with R and R', which are identical or different, denoting a linear or branched alkyl or alkenyl radical, R and R' comprising at least 12 carbon atoms, and at least one direct dye and/or at least one dye precursor.