Hair Dye Composition Using Pyrazolo[1,2-a]pyrazole for Warm Shades
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hair dye compositions using neutral pH oxidation bases struggle to achieve a wide range of shades, particularly warm shades like reds and oranges, and lack resistance to hair damage from shampoos, light, and sweat.
Innovation Solution
A composition comprising 2,3-diamino-6,7-dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-1-one as a first oxidation base, 4,5-diamino 1-(β-hydroxyethyl) pyrazole as a second oxidation base, and 2-chloro 6-methyl 3-amino phenol as a coupler, which allows for the creation of intense, chromatic red and coppery shades that are resistant to hair damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If neutral pH oxidation bases (para-phenylenediamine, para-aminophenol derivatives) are used, then a fairly wide range of colors can be obtained, but the chromaticity is insufficient and color intensity, uniformity, and tenacity are not excellent
Solution Approach 1:
The patent combines multiple oxidation bases (para-phenylenediamine derivative, para-aminophenol derivative, and pyrazolo[1,2-a]pyrazole derivative) with specific couplers to create a composite dyeing system. This composite approach allows achieving excellent chromaticity, color intensity, uniformity, and tenacity while maintaining a wide color range, resolving the contradiction between versatility and reliability.
2Adaptability or versatility
If neutral pH oxidation bases are used, then coloring can be achieved, but warm shades such as reds and oranges cannot be obtained
Solution Approach 1:
The patent introduces a pyrazolo[1,2-a]pyrazole derivative with specific chemical structure parameters that enable warm shade formation at neutral pH. By changing the chemical parameters of the oxidation base (molecular structure, functional groups), the system can produce reds and oranges while maintaining neutral pH conditions, resolving the contradiction between color range and ease of producing warm shades.
3Reliability
If conventional oxidation dye precursors are used, then permanent colorings can be obtained, but resistance to hair damage from shampoos, light, and sweat is insufficient
Solution Approach 1:
The patent creates a composite dyeing system combining specific oxidation bases with couplers that form highly resistant color complexes. This composite approach produces permanent colorings with enhanced resistance to shampoos, light, and sweat by creating stable molecular structures that bond strongly to keratin fibers, resolving the contradiction between permanent coloring and resistance to harmful factors.
4Ease of manufacture
If acidic pH compositions are used, then red and coppery shades can be obtained, but the patent seeks to achieve this at neutral pH for better hair compatibility
Solution Approach 1:
The patent changes the pH parameter from acidic to neutral by selecting specific oxidation bases (pyrazolo[1,2-a]pyrazole derivative) that can form red and coppery shades at neutral pH. This parameter change maintains hair compatibility while achieving the desired warm shades, resolving the contradiction between ease of producing red/coppery shades and hair compatibility.
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 intense, non-selective, and aesthetically pleasing red and coppery shades that are resistant to various hair attacks, including shampoos, light, and sweat, while maintaining color intensity and uniformity at neutral pH.
Implementation Method 1
Precursors of oxidation dyes, or oxidation bases, are colorless or weakly colored compounds which, associated with oxidizing products, can give rise, through an oxidative condensation process, to colored or coloring compounds.
Data Source
AI summary
Composition (I) comprises: at least one first oxidation base comprising 2,3-diamino-6,7-dihydro-1H,5H-pyrazolo [1,2-a] pyrazol-1-one and their addition salts, at least one second oxidation base comprising 4,5-diamino 1-(beta -hydroxyethyl) pyrazole and their addition salts, and at least one linker comprising 2-chloro-6-methyl 3-amino phenol and their addition salts, in a medium. Independent claims are included for: (1) process for dyeing keratin fibers comprising applying (I) to the keratin fibers in the presence of oxidizing agents for a time sufficient to develop the desired coloration; and (2) multi-compartment device in which a first compartment contains a dye composition and a second compartment contains one or several oxidizing agents.