Direct Dye Composition with Alkalizing Agents for Durable Hair Color
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Solution Overview
Problem
Direct dyes on keratin fibers, particularly human hair, suffer from low durability and color fading after chemical treatments, making it challenging to maintain consistent color intensity and appearance.
Innovation Solution
A dyeing composition comprising alkalizing agents, direct dyes, and imidazolidin-2,4-diones, with a pH range of 7 to 12, which enhances dyeing intensity and durability by improving the hair's structure and cosmetic appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If direct dyes are applied to chemically treated keratin fibers, then dye uptake is improved, but durability and wash fastness deteriorate
Solution Approach 1:
The patent introduces alkalizing agents as intermediary substances that modify the keratin fiber structure to create a more favorable environment for direct dye binding. These agents raise the pH to open the hair cuticle and alter the keratin structure, enabling better dye penetration and anchoring without requiring chemical damage to the fiber. This mediator approach resolves the contradiction by providing a chemical bridge between the direct dye and the treated keratin fiber.
Solution Approach 2:
The patent changes the pH parameter of the dyeing composition by incorporating alkalizing agents, which transforms the chemical environment to enhance both dye uptake and durability. By adjusting the pH to alkaline conditions, the keratin fiber structure becomes more receptive to direct dyes while maintaining integrity, thus improving both quantity of dye uptake and reliability of color fastness simultaneously.
2Illumination intensity
If direct dyes are used on chemically treated hair, then color intensity is initially improved, but wash fastness deteriorates after multiple washes
Solution Approach 1:
The patent applies alkalizing agents in advance to modify the keratin fiber structure before direct dye application. This preliminary chemical treatment opens the cuticle and optimizes the fiber morphology, creating conditions that enable both high color intensity and long-lasting fastness. The preliminary action ensures that subsequent dye application achieves maximum penetration and binding capacity from the first treatment.
Solution Approach 2:
The patent creates a composite system combining alkalizing agents, direct dyes, and conditioning components that work synergistically. The alkalizing agents modify the keratin structure while the direct dyes provide color, and the combination produces a composite effect where both color intensity and wash fastness are enhanced beyond what either component could achieve alone.
3Quantity of substance
If chemical services are performed on hair, then dye uptake is improved, but color consistency deteriorates due to additional damage
Solution Approach 1:
The patent converts the harmful effect of chemical treatment-induced damage into a beneficial opportunity. Instead of avoiding chemically treated hair, the invention uses alkalizing agents to deliberately create controlled chemical modifications that mimic and enhance the porous structure created by prior damage. This approach transforms the vulnerability of treated hair into an advantage for improved dye uptake while maintaining color consistency through uniform alkaline treatment.
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 provides increased dyeing intensity and improved wash fastness, resulting in a healthier-looking hair with sustained color, even after multiple washes.
Implementation Method 1
a) one or more alkalizing agent(s)... wherein the total concentration of alkalizing agent(s) is in the range of 0.5% to 40% by weight
Implementation Method 2
one or more direct dye(s)... wherein one or more direct dye(s) as compound(s) according to group b) is/are selected from Acid Black 1, Acid Blue 1, Acid Blue 3, Food Blue 5, Acid Blue 7, Acid Blue 9, Acid Blue 74, Acid Orange 3, Acid Orange 6, Acid Orange 7, Acid Orange 10, Acid Red 1, Acid Red 14, Acid Red 18, Acid Red 27, Acid Red 50, Acid Red 52, Acid Red 73, Acid Red 87, Acid Red 88, Acid Red 92, Acid Red 155, Acid Red 180, Acid Violet 9, Acid Violet 43, Acid Violet 49, Acid Yellow 1, Acid Yellow 23, Acid Yellow 3, Food Yellow No. 8, D&C Brown No. 1, D&C Green No. 5, D&C Green No. 8, D&C Orange No. 4, D&C Orange No. 10, D&C Orange No. 11, D&C Red No. 21, D&C Red No. 27, D&C Red No. 33, D&C Violet 2, D&C Yellow No. 7, D&C Yellow No. 8, D&C Yellow No. 10, FD&C Red 2, FD&C Red 40, FD&C Red No. 4, FD&C Yellow No. 6, FD&C Blue 1, Food Black 1, Food Black 2, Disperse Black 9, Disperse Violet 1, Acid Red 52, DC Violet 2, DC Red 33, DC Orange 4, DC Red 27, DC Yellow 10, HC Blue 18, HC Red 18, HC Yellow 16, Basic Blue 6, Basic Blue 7, Basic Blue 9, Basic Blue 26, Basic Blue 41, Basic Blue 99, Basic Brown 4, Basic Brown 16, Basic Brown 17, Natural Brown 7, Basic Green 1, Basic Red 2, Basic Red 12 Basic Red 22, Basic Red 76, Basic Violet 1, Basic Violet 2, Basic Violet 3, Basic Violet 10, Basic Violet 14, Basic Yellow 57, Basic Red 51, Basic Yellow 87, HC Blue 17 and Basic Orange 31
Data Source
AI summary
A dyeing composition for keratin fibers, containing one or more alkalizing agents, one or more direct dyes, and one or more compounds selected from the following groups: wherein R1, R2, and R3 are independently selected from H and CH3, and 2) one or more imidazolidin-2,4-diones and salts thereof. A total concentration of the one or more alkalizing agents is in a range of 0.5% to 40% by weight, calculated to the total weight of the dyeing composition.