Matting Additive for Bleaching Preventing Color Shifts
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Solution Overview
Problem
Current bleaching methods for keratin fibers, particularly human hair, face challenges in reducing exposure time, achieving even color lightening, and preventing undesirable color shifts towards yellowish or reddish tones, especially when bleaching darker hair, due to the use of high pH levels and aggressive oxidizing agents which can cause instability in toning agents.
Innovation Solution
A bleaching agent comprising a mixture of red and blue direct dyes in a specific weight ratio combined with a non-ionic component of HLB value ≤ 8.0, used in an aqueous or aqueous-alcoholic carrier, provides a stable matting additive that protects dyes under aggressive bleaching conditions, preventing unwanted color shifts and achieving a silvery, cool impression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high pH levels (9-10.5) are used to ensure cuticle opening and hydrogen peroxide penetration, then bleaching performance is improved, but ammonia odor and irritation increase
Solution Approach 1:
The patent replaces ammonia with alternative alkalinizing agents that achieve the necessary pH level (9-10.5) without the harmful properties of ammonia. This parameter change maintains the chemical effectiveness for cuticle opening and peroxide penetration while eliminating the odor and irritation issues
Solution Approach 2:
The patent uses alternative alkalinizing agents that can be easily replaced and do not persist in the hair or environment like ammonia. These agents provide the necessary alkalinity temporarily during the bleaching process and can be rinsed away without leaving harmful residues
2Productivity
If exposure time is reduced to improve user convenience, then productivity is improved, but bleaching performance deteriorates
Solution Approach 1:
The patent modifies the chemical parameters of the bleaching system by incorporating stable tinting components and alternative alkalinizing agents that enhance the reactivity and efficiency of hydrogen peroxide. This allows achieving the same bleaching effect in shorter time (30-60 minutes) while maintaining performance
Solution Approach 2:
The patent creates a composite bleaching system combining hydrogen peroxide, stable tinting components, and alternative alkalinizing agents. This composite formulation synergistically enhances the bleaching action, allowing faster processing times without sacrificing the desired color lightening effect
3Reliability
If aggressive oxidizing agents are used to achieve sufficient bleaching effect, then bleaching performance is improved, but toning agent stability deteriorates
Solution Approach 1:
The patent introduces stable tinting components as intermediaries that resist degradation by the aggressive oxidizing environment. These components act as protective agents that maintain their color-balancing properties even in the presence of strong oxidants, ensuring consistent matting effect throughout the bleaching process
Solution Approach 2:
The patent stabilizes the toning agents by adjusting the chemical environment through alternative alkalinizing agents and controlled pH levels. This parameter control prevents premature degradation of the tinting components while maintaining the necessary oxidative power for effective bleaching
4Productivity
If darker hair is bleached to achieve significant color lightening, then productivity is improved, but color shift towards yellowish or reddish tones increases
Solution Approach 1:
The patent incorporates stable tinting components that provide complementary colors to counteract the warm tone shifts during bleaching. These tinting agents deposit on the hair shaft and neutralize yellowish or reddish reflections, maintaining a cool, silvery blonde result even when bleaching dark hair
Solution Approach 2:
The patent creates a composite formulation combining hydrogen peroxide, stable tinting components, and alternative alkalinizing agents. This composite system simultaneously achieves strong oxidative bleaching and color balancing, preventing warm tone shifts while lightening dark hair to the desired cool blonde shade
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 solution enables a one-stage bleaching process with excellent color balance and matting effect, reducing exposure time while maintaining bleaching performance and preventing undesirable color shifts, thus improving the efficiency and user experience of hair lightening.
Implementation Method 1
During the bleaching process, the natural melanin dyes are usually destroyed by oxidative action, resulting in the fibers becoming discolored
Implementation Method 2
Such high pH values are necessary to ensure an opening of the outer cuticle and thus enable penetration of the active species (hydrogen peroxide) into the hair
Data Source
AI summary
The present invention relates to an agent containing at least one non-ionic component having an HLB smaller than, or equal to 8.0, and to the combination of a blue and a red, directly drawing colorant, wherein the weight ratio of the blue colorants as opposed to the red colorants is greater than 1. The invention further discloses agents for dying human hair blond, further comprising at least one oxidation agent preparation, and optionally a bleaching force reinforcing preparation. Due to the agents according to the invention it has become possible to avoid undesired color shifts towards yellow or red nuances during blond hair dying.