Skin Marker Composition Using Aminoalkyl Copolymer for Pigment Stability
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Solution Overview
Problem
Existing marker compositions for skin struggle to prevent color separation, flaky pigment fallout, and dye absorption into the skin, while also ensuring easy application and maintaining visibility of drawn lines regardless of skin color.
Innovation Solution
A marker composition for skin containing 0.95 to 4.75 mass% of an acid dye, an aminoalkyl (meth)acrylate copolymer, a water-soluble organic solvent, a flaky pigment, and water, with a pH less than 7.0, is used in conjunction with a batting type application tool to facilitate stable discharge and prevent unwanted pigment fallout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a flaky pigment is added to the marker composition to impart brightness, then the brightness is improved, but the pigment is likely to be precipitated and aggregated
Solution Approach 1:
A polymer emulsion is introduced as an intermediary substance to bind the flaky pigment particles together and disperse them uniformly in the aqueous medium. The polymer emulsion acts as a mediator between the hydrophobic pigment and the hydrophilic solvent, preventing aggregation and precipitation while maintaining brightness.
Solution Approach 2:
The marker composition is formulated as a composite system combining multiple components: flaky pigment for brightness, polymer emulsion for stabilization, acid dye for color, and aqueous solvent. This composite approach allows each component to perform its specific function while working together to prevent pigment aggregation.
2Illumination intensity
If an acid dye is used for good color development, then the color brightness is improved, but the dye may be absorbed into the skin
Solution Approach 1:
The polymer emulsion serves as a protective intermediary layer between the acid dye and the skin. It binds the dye molecules and controls their interaction with the skin surface, allowing color development while reducing direct absorption into the skin tissue.
Solution Approach 2:
The pH of the composition is controlled to be less than 7.0, which optimizes the charge state of both the acid dye and the polymer emulsion. This parameter control enhances the binding between dye and polymer while reducing dye's affinity for skin absorption.
3Illumination intensity
If the flaky pigment has a large particle diameter for brightness, then the brightness is improved, but it is extremely difficult to redisperse the pigment when aggregated
Solution Approach 1:
The polymer emulsion acts as a dispersing intermediary that coats the surface of large flaky pigment particles, providing steric stabilization. This prevents aggregation in the first place and enables easy redispersion if settling occurs, as the polymer layer prevents strong inter-particle attraction.
Solution Approach 2:
The pigment is pre-coated with polymer emulsion during manufacturing before final packaging. This preliminary action ensures that even large flaky particles are pre-protectioned against aggregation, making them much easier to redisperse later without requiring excessive mechanical force.
4Ease of operation
If the ink composition is stored in a direct liquid state for easy application, then the ease of operation is improved, but the flaky pigment is likely to settle and aggregate
Solution Approach 1:
The polymer emulsion serves as a stabilizing intermediary that keeps flaky pigment particles suspended in the liquid medium during storage. It provides continuous steric stabilization that prevents settling and aggregation, maintaining the composition in a ready-to-apply liquid state without requiring special storage conditions.
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 effectively prevents color separation and pigment fallout, while ensuring the dye does not absorb into the skin, allowing for easy application and maintaining excellent visibility of drawn lines across various skin tones.
Implementation Method 1
an aminoalkyl (meth)acrylate copolymer... can prevent color separation, falling of the flaky pigment
Implementation Method 2
an aminoalkyl (meth)acrylate copolymer... can prevent... absorption of the dye into the skin
Data Source
AI summary
Provided are a bright marker composition for skin and an application tool for the composition. The composition can prevent color separation using a dye and a flaky pigment with good color development and also prevent falling of the flaky pigment and absorption of the dye into the skin or the like, and can be applied easily. The marker composition for skin includes at least 0.95 to 4.75 mass% of an acid dye, an aminoalkyl (meth)acrylate copolymer, a water-soluble organic solvent, a flaky pigment, and water, wherein a pH is less than 7.0, the aminoalkyl (meth) acrylate copolymer is a copolymer polymerized from monomers, each of the monomers being a monomer selected from Group A and a monomer selected from Group B, and a ratio of the monomer of Group B is 2 to 15 mass% in the copolymer: Group A: ethyl (meth)acrylate, methyl (meth)acrylate, n-propyl (meth)acrylate, and the like; and Group B: 2-(dimethylamino)ethyl (meth)acrylate, 2-(diethylamino)ethyl (meth)acrylate, and 3-(dimethylamino)propyl (meth)acrylate.