Oxidative Hair Dye Composition with Specific Developer Ratios
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Solution Overview
Problem
Existing oxidative hair coloring materials struggle to achieve optimal washfastness and lightfastness, particularly in producing vibrant red violet and copper shades.
Innovation Solution
A multi-component packaging unit containing specific combinations of oxidation dye pre-products, including 4.5-diamino-1-(2-hydroxyethyl)-1H pyrazole as a developer, P-toluylendiamine as a second developer, 2-(2,4-diaminophenoxy) ethanol as a coupler, and M-dihydroxybenzene derivatives, used in defined molar ratios to enhance color stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional oxidative dyes are used to achieve red, violet and copper shades, then the desired color intensity is obtained, but the washfastness and lightfastness are insufficient
Solution Approach 1:
The patent uses composite dye compositions combining multiple developer components (4,5-diamino-1-(2-hydroxyethyl)-1H-pyrazole and p-toluenediamine) and coupler components (m-diaminobenzene derivatives and m-dihydroxybenzene derivatives) in specific molar ratios to create a composite material that achieves both vibrant red/violet/copper shades and improved washfastness and lightfastness
Solution Approach 2:
The patent optimizes the molar ratio parameters of developer and coupler components, specifically using 4,5-diamino-1-(2-hydroxyethyl)-1H-pyrazole in a molar ratio of at least 1.2 to p-toluenediamine, and optimizing the ratios of coupler components to achieve the desired color fastness properties while maintaining color intensity
2Duration of action of stationary object
If direct dyes are used for hair coloring, then minimal hair damage occurs, but the color shelf life is short and washout is rapid
Solution Approach 1:
The patent changes the chemical state of the dye from pre-formed pigments to oxidation dye precursors that form the actual dye in situ through oxidation reactions, thereby extending the duration of color action while controlling the oxidation process to minimize hair damage
Solution Approach 2:
The patent uses oxidation dye precursors as intermediaries that are converted to the actual dye molecules through oxidation with hydrogen peroxide, allowing the dye to form within the hair fiber and providing longer-lasting color compared to direct dyes while being less damaging than conventional oxidative dyes
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 described solution achieves excellent washfastness and lightfastness, ensuring that the colored hair maintains its vibrancy and color intensity even after repeated washing and exposure to daylight.
Implementation Method 1
oxidative color-changing agents are typically used... so-called oxidation dyes are used. Such dyes typically contain oxidation dye precursors, so-called developer components, and coupler components, which, under the influence of oxidizing agents, form the actual dyes
Data Source
AI summary
The invention relates to an agent for oxidatively dyeing keratin fibers, containing, in a cosmetic carrier, (A) 4,5-diamino-1-(2-hydroxyethyl)-1H-pyrazole and/or one of the physiologically acceptable salts thereof as a developer, (B) at least one p-diaminobenzene derivative from the group of p-toluylenediamine, 2-(2,5-diaminophenyl)ethanol and/or one of the physiologically acceptable salts thereof as a developer, (C) at least one m-diaminobenzene derivative from the group of 2-(2,4-diamino-phenoxy)ethanol, 1-methoxy-2-amino-4-(2'-hydroxyethylamino)benzene and/or one of the physiologically acceptable salts thereof as a coupler, and (D) at least one m-dihydroxybenzene derivative from the group of resorcinol, 2-methylresorcinol, and/or 4-chlororesorcinol, wherein the molar ratio of all developers of group (A) contained in the agent to all developers of group (B) contained in the agent, i.e., the molar ratio (A)/(B), has a value of at least 1.2.