Viscosity-Controlled Hair Dye Mixture Prevents Dripping
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Solution Overview
Problem
Oxidative hair dyes and bleaches cause hair damage due to activated hydrogen peroxide, leading to excessive dye penetration or bleaching when re-treating damaged hair, resulting in uneven color outcomes and a complicated two-step application process.
Innovation Solution
A cosmetic product combining a first agent with an alkali and a second agent containing hydrogen peroxide, featuring a polymer with a diallyl quaternary ammonium salt, specific surfactants, and a polyoxyalkylene-based nonionic surfactant, which maintains low viscosity for easy application and high viscosity for spreadability, allowing uniform dyeing or bleaching without dripping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If oxidative hair dyes or hair bleaches are applied to previously dyed hair, then hair color can be changed, but excessive dye penetration or bleaching occurs due to hair damage from prior oxidation
Solution Approach 1:
The hair treatment process is segmented into two separate applications: first treating newly grown hair with oxidative hair dye/bleach, then treating previously dyed hair with a different formulation. This segmentation prevents excessive penetration into already damaged hair while ensuring adequate treatment of new growth.
Solution Approach 2:
Different formulations are applied to different regions of hair based on their condition: newly grown hair receives one formulation while previously dyed hair receives another. This local quality approach tailors the chemical treatment to the specific state of each hair region.
2Manufacturing precision
If two separate applications of oxidative hair dyes or hair bleaches are used to treat newly grown hair and previously dyed hair, then uniform coloring can be achieved, but the procedure becomes complicated and labor-intensive
Solution Approach 1:
Two separate hair treatment formulations are merged into a single dual-purpose product. The first agent (oxidative hair dye/bleach) and second agent (hair treatment composition) are combined in one container with a mixing mechanism, allowing both treatments to be applied simultaneously rather than requiring separate applications.
Solution Approach 2:
The cosmetic product achieves multi-functionality by incorporating both the oxidative hair dye/bleach formulation and the hair treatment formulation into a single product. This universal product can treat both newly grown hair and previously dyed hair in one application process.
3Ease of operation
If the viscosity of the hair dye mixture is reduced for easy application, then the product can be easily applied to hair roots, but dripping occurs during application
Solution Approach 1:
The product utilizes dynamic viscosity properties where the mixture exhibits different flow characteristics at different stages. The first agent has low viscosity for easy application, but upon mixing with the second agent and contact with hair, the overall mixture viscosity increases to prevent dripping while maintaining spreadability.
Solution Approach 2:
The viscosity parameter of the cosmetic mixture is dynamically adjusted through the mixing process. The first agent starts with low viscosity for easy application, but the addition of the second agent and interaction with hair causes viscosity to increase, preventing dripping while maintaining ease of spreadability.
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 product ensures uniform hair dyeing or bleaching by preventing dripping and facilitating spreadability from the hair root to the tip, reducing hair damage and simplifying the application process for both experienced and inexperienced users.
Implementation Method 1
a first agent containing an alkali and a second agent containing hydrogen peroxide are mixed together to activate hydrogen peroxide, and then hair melanin is decomposed and an oxidative dye is polymerized on hair of the head
Implementation Method 2
a first agent containing an alkali and a second agent containing hydrogen peroxide are mixed together to activate hydrogen peroxide
Implementation Method 3
the cosmetic product comprises the following components (A) to (D) in a mixture of the first agent and the second agent: (A) a polymer comprising a diallyl quaternary ammonium salt as a constitutional unit, (B) a compound represented by general formula (3), (C) an anionic surfactant having carboxy group(s), and (D) a polyoxyalkylene-based nonionic surfactant
Data Source
AI summary
A cosmetic product for hair dyeing or hair bleaching comprising a first agent containing an alkali agent and a second agent containing hydrogen peroxide, wherein viscosity of any one of the first agent and the second agent is 100 mPa·s or less, and viscosity of the other agent is 1000 mPa·s or more, the cosmetic product comprising components (A) to (D) in a mixture of the first agent and the second agent, wherein the mass ratio of [(B)+(C)]/(A) in the mixture is 2 or more and 11 or less:(A) a polymer containing a diallyl quaternary ammonium salt as a constitutional unit and having a charge density of 2.5 meq/g or more and 9 meq/g or less,(B) a compound represented by formula (3):R5—O—(CH2CH2O)n—[CH2CH(CH3)O]m—SO3M1 (3)wherein R5 represents a C8-25 hydrocarbon group, n represents an average addition molar number of 0 to 50, m represents an average addition molar number of 0 to 50, and M1 represents an alkali metal or NH4,(C) an anionic surfactant having carboxy group(s), and(D) a polyoxyethylene-based nonionic surfactant wherein the average addition molar number of the oxyethylene group is 90 or more and 250 or less.