Functional Particle Dispersion With Neutral Zeta Potential Stability
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Solution Overview
Problem
Existing functional particle dispersions, such as those containing antimicrobial and reducing particles, suffer from instability and loss of surface tension when added to compounding systems like aqueous inks, due to electric charge interactions, leading to unsatisfactory dispersion stability and compatibility issues.
Innovation Solution
Dispersing functional particles formed from a (meth)acrylate monomer and specific functional components in water, with a zeta potential range of -15 to +15 mV, using nonionic polymerizable surfactants during emulsion polymerization to maintain stability and surface tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If anionic surfactants are used as polymerizable surfactants to achieve high dispersion force, then dispersion capability is improved, but stability in compounding systems and surface tension retention deteriorate due to electric charge interactions
Solution Approach 1:
The patent changes the zeta potential parameter of the functional particles from highly negative (using anionic surfactants) to a neutral range of -15 to +15 mV. This parameter change eliminates excessive electric charge repulsion while maintaining sufficient dispersion stability, resolving the contradiction between initial dispersion force and long-term stability in compounding systems.
Solution Approach 2:
The patent employs nonionic polymerizable surfactants that do not leave persistent electric charges in the system. These surfactants provide sufficient dispersion force during particle formation but do not cause long-term instability or surface tension loss, effectively replacing the problematic anionic surfactants that created the technical contradiction.
2Force
If anionic surfactants are used to achieve high dispersion force, then initial dispersion capability is improved, but surface tension stability deteriorates
Solution Approach 1:
The patent changes the surface charge parameter (zeta potential) from highly negative values to a neutral range of -15 to +15 mV. This eliminates the excessive electric charge interactions that cause surface tension loss while maintaining adequate dispersion capability through the nonionic surfactant system.
Solution Approach 2:
The patent uses nonionic polymerizable surfactants that provide temporary dispersion force during particle formation but do not persist as charged species that would cause long-term surface tension instability. This resolves the contradiction between initial dispersion capability and surface tension stability.
3Reliability
If functional particles with high dispersion force are used, then antimicrobial and functional effects are improved, but compatibility with compounding systems deteriorates
Solution Approach 1:
The patent adjusts the zeta potential parameter to fall within the neutral range of -15 to +15 mV, which reduces electric charge interactions that cause incompatibility with various compounding systems. This parameter change maintains the antimicrobial functionality while improving adaptability to different application environments including aqueous inks and cosmetics.
Solution Approach 2:
The patent creates a universal particle dispersion system using nonionic surfactants that can be compatibly integrated into multiple different compounding systems (aqueous inks, cosmetics, etc.) without causing charge-based incompatibilities. This single approach provides broad adaptability across various applications while maintaining the specific antimicrobial and functional effects.
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 resulting dispersion achieves stable antimicrobial, fragrance, and oxygen reduction effects, with improved compatibility and low irritancy, suitable for various applications including aqueous inks and cosmetics.
Implementation Method 1
dispersing, in water, functional particles for specific physical properties containing at least a (meth)acrylate monomer represented by a specific formula and a specific functional component
Implementation Method 2
each of the dispersions described in the aforementioned Patent Documents 1 and 2, in which antimicrobial particles and the like are structured by electric charge repulsion by using an anionic surfactant as a polymerizable surfactant to achieve a high dispersion force
Data Source
Figure 1
AI summary
A functional particle dispersion, and an aqueous ink composition for writing instruments containing the same are provided. The functional particle dispersion has, in a compatible manner, antimicrobial effects, reduction performance, and fragrance performance at high level and long-lasting effects of these (slow releasing properties) without adversely affecting other blended components and the like, exhibits excellent dispersion stability even in a compounding system that is easily affected by ions and the like, has a high degree of freedom in design of the functional particles, and can be used in various applications. The functional particle dispersion of the present disclosure at least contains functional particles dispersed in water and has a measured zeta potential value of the surface of the functional particle being a range of -15 to +15 mV, the functional particles including a (meth)acrylate monomer represented by the following General Formula (I), at least one type of specific antimicrobial component, a reducing component, and at least one type of aroma component as a fragrance. In Formula (I) provided above, A is H or the like, and R is H, an alkyl group having 1 to 22 carbon atoms, or the like.