Oxidative and Direct Dye Composition for Wash-Fast Hair Color
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Solution Overview
Problem
Direct dyes lack durability on keratin fibers, especially after chemical treatments, leading to low wash fastness and color fading, which is challenging for hairdressers to predict and manage.
Innovation Solution
A composition comprising 1,4-diamino-2-methoxymethyl-benzene and/or its salts, oxidative dye couplers, and direct dyes like HC Blue 18, HC Red 18, and HC Yellow 16, along with an optional alkalizing agent, is used to enhance dyeing intensity and wash fastness on keratin fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If direct dyes are applied to keratin fibers, then ease of application is improved, but durability and wash fastness deteriorate
Solution Approach 1:
The patent combines direct dyes with oxidative dyes to create a composite dyeing system. The direct dyes provide ease of application and initial color intensity, while the oxidative dyes form durable bonds with the keratin fibers. This composite approach allows the composition to deliver both the ease of direct dyes and the durability of oxidative dyes simultaneously.
2Quantity of substance
If direct dyes are used on chemically treated hair, then dye uptake is improved, but wash fastness deteriorates
Solution Approach 1:
The composition uses a composite dyeing system where direct dyes provide high uptake on chemically treated hair due to their ability to penetrate damaged cuticles, while oxidative dyes simultaneously form permanent bonds within the fiber structure, ensuring wash fastness despite the compromised hair condition.
Solution Approach 2:
The oxidative dye components act as intermediaries that bridge the gap between the direct dyes and the keratin fiber. They form covalent bonds with the fiber and create a durable framework that anchors the direct dyes, preventing their premature removal during washing while maintaining high initial uptake.
3Illumination intensity
If direct dyes are applied, then color intensity is achieved, but color retention and durability worsen
Solution Approach 1:
The patent employs a composite dyeing composition where direct dyes provide immediate, intense coloration upon application, while oxidative dyes progressively develop and form durable color bonds. The combination ensures both high initial color intensity and long-term color retention through the synergistic action of both dye types.
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 improves dyeing intensity and wash fastness, providing a healthier cosmetic appearance and feel to keratin fibers, especially human hair, with enhanced durability and color retention.
Implementation Method 1
one or more oxidative dye coupler(s) or oxidative dye precursor... different from compounds according to group a)... optionally comprising one or more oxidizing agent(s)
Implementation Method 2
one or more direct dye(s) selected from HC Blue 18, HC Red 18, and HC Yellow 16... applying the ready-to-use composition onto keratin fibers
Data Source
AI summary
The present invention is directed to a composition for dyeing of keratin fibers, preferably of human keratin fibers, more preferably of human hair, comprising a) 1,4- diamino-2-methoxymethyl-benzene and/or its hydrates, and/or its salt(s), b) one or more oxidative dye coupler(s) or oxidative dye precursor different from compounds according to group a), c) one or more direct dye(s) selected from HC Blue 18, HC Red 18, and HC Yellow 16, and/or their salt(s), and/or their mixtures.