Core-Shell Polymer Solvent Composition for Low Viscosity Dispersion
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Solution Overview
Problem
Existing solvent compositions for dispersing core-shell polymer particles in organic solvents face challenges with high viscosity and limited concentration due to excessive swelling of the particles, which hinders their effective use in improving the toughness of materials like printed wiring boards and paints.
Innovation Solution
A solvent composition is developed that stabilizes core-shell polymer particles at high concentrations by using a combination of low/medium polar and high polar solvents, specifically within a Hansen solubility parameter range, which suppresses particle swelling and maintains low viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If core-shell polymer particles are dispersed in a single organic solvent with high affinity, then dispersibility is improved, but particle swelling increases and viscosity increases
Solution Approach 1:
The patent combines two different organic solvents with distinct Hansen solubility parameters into a mixed solvent system. The first solvent (lower δd, δp, δh values) provides good dispersibility, while the second solvent (higher δd, δp, δh values) suppresses particle swelling, achieving both goals simultaneously through synergistic interaction.
Solution Approach 2:
The patent changes the solvent system from a single solvent to a mixed solvent system with specific Hansen solubility parameter ranges. By carefully selecting solvents with complementary parameter profiles and controlling their weight ratio (30:70 to 70:30), the system achieves optimal balance between dispersibility and swelling control.
2Quantity of substance
If core-shell polymer particles are dispersed at high concentration, then toughness improvement is enhanced, but viscosity increases excessively
Solution Approach 1:
The mixed solvent system combines the benefits of two solvents: the first solvent enables high particle concentration dispersal, while the second solvent maintains low viscosity even at high concentrations, allowing the system to achieve both high toughness improvement and ease of handling.
Solution Approach 2:
The patent creates a composite solvent system that functions as a unified medium with properties superior to individual solvents. The composite solvent mixture enables high concentration dispersion with controlled viscosity, effectively solving the trade-off between quantity and operability.
3Ease of operation
If affinity between particles and solvent is increased to reduce viscosity, then dispersibility improves, but particle swelling increases
Solution Approach 1:
The patent uses Hansen solubility parameter matching to select solvents with specific affinity characteristics. The first solvent group (lower parameters) provides appropriate affinity for low viscosity, while the second solvent group (higher parameters) provides sufficient affinity for stability, achieving both goals through parameter optimization.
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 solvent composition effectively disperses core-shell polymer particles at high concentrations with low viscosity, enhancing their ability to improve the toughness of materials without increasing the amount of solvent, thereby reducing defects and improving handling properties.
Implementation Method 1
one or more organic solvents (A) having a polar term δp of a Hansen solubility parameter of less than 11 and a hydrogen bond term δh of less than 10 and one or more organic solvents (B) satisfying at least one of 11 or more of the polar term δp and 10 or more of the hydrogen bond term δh
Data Source
AI summary
The present invention provides a low viscosity solvent composition in which core-shell polymer particles are stably dispersed at a high concentration in an organic solvent, and a method for its production. The solvent composition includes an organic solvent containing, in a weight ratio of 15 : 85 to 95 : 5, one or more organic solvents (A) having a polar term δp of a Hansen solubility parameter of less than 11 and a hydrogen bond term δh of less than 10 and one or more organic solvents (B) satisfying at least one of 11 or more of the polar term δp and 10 or more of the hydrogen bond term δh and one or more types of core-shell polymer particles. In this solvent composition, a content of the core-shell polymer particles is 20 to 40% by weight based on a total weight of the solvent composition.