Powder Hair Dye Composition Stabilization
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Solution Overview
Problem
Powder hair dye compositions containing percarbonate experience a change in dyed color tone over time due to the presence of m-aminophenol, 5-amino-o-cresol, or resorcin, leading to instability and uneven color results during and after storage.
Innovation Solution
Incorporating a minimum of 7 mass% starch into the powder hair dye composition, along with percarbonate and an oxidation dye, to stabilize the color tone and improve storage stability, while also enhancing coating operability and hair feel by adjusting the mass ratios of starch, chelating agents, and water-soluble polymers like xanthan gum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If percarbonate and oxidation dyes (m-aminophenol, 5-amino-o-cresol, or resorcin) are blended in powder hair dye composition, then hair dyeing power is improved, but time-dependent change in dyed color tone occurs during storage
Solution Approach 1:
Starch is introduced as an intermediary substance that interacts with percarbonate to suppress premature oxidation of the dye. The starch acts as a mediator that controls the release and reaction of percarbonate, preventing direct contact and unwanted oxidation reactions between percarbonate and sensitive dyes like m-aminophenol, 5-amino-o-cresol, or resorcin during storage.
Solution Approach 2:
The invention changes the chemical environment parameters by introducing starch, which alters the reactivity and stability characteristics of the percarbonate-dye system. This parameter change suppresses the time-dependent oxidation rate, maintaining consistent color tone throughout storage periods.
2Reliability
If starch is added to suppress color tone change, then storage stability is improved, but formulation complexity increases
Solution Approach 1:
Starch serves multiple functions simultaneously: it stabilizes percarbonate, suppresses premature oxidation, maintains color tone consistency, and can act as a carrier or filler. This multi-functionality reduces the need for additional separate stabilizing agents, thereby limiting the increase in formulation complexity.
3Stability of the object's composition
If starch content is increased to 7 mass% or more, then color tone stability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent establishes a predetermined minimum starch content threshold (7 mass%) that, when met, guarantees the stabilizing effect. This preliminary设定 of a clear threshold simplifies quality control by providing a binary pass/fail criterion rather than requiring continuous optimization, thereby reducing manufacturing precision requirements.
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 effectively suppresses time-dependent changes in the dyed color tone, maintains storage stability, and improves the ease of application and finish quality of the hair dye, ensuring consistent and vibrant results.
Implementation Method 1
a change is suppressed in the dyed color tone before and after storage by blending a certain amount or more of starch in the powder hair dye compositions
Implementation Method 2
a powder hair dye composition which contains (A) a percarbonate, (B) a starch, and (C) an oxidation dye
Implementation Method 3
Hair dye compositions are those for dyeing hair by oxidizing an oxidation dye and developing a color on the hair
Data Source
AI summary
The purpose of the present invention is to solve the problem, in powder hair dye compositions that contain a percarbonate, that a change occurs in the dyed color tone before and after storage when the composition contains metaaminophenol, 5-aminoorthocresol, resorcin, or a salt thereof, as an oxidation dye. To solve the aforementioned problem, a powder hair dye composition containing (A) a percarbonate, (B) a starch, and (C) an oxidation dye is provided, characterized in that the composition contains at least 7 mass% starch (B) and in that the oxidation dye (C) contains at least one selected from metaaminophenol, 5-aminoorthocresol, resorcin, and salts thereof. Thus, a powder hair dye composition can be obtained which suppresses change in the dye color tone before and after storage and which has excellent storage stability.