Two-Component Curable Resin Composition for Printed Wiring Boards
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Solution Overview
Problem
Two-component curable resin compositions used in printed wiring boards often suffer from poor dispersibility of components, leading to uneven film thickness and visible copper issues, and require large packaging forms that increase transportation costs.
Innovation Solution
Adjusting the viscosity range of the A agent and B agent within specific ranges (50-200 dPa·s and 100-300 dPa·s respectively) and optimizing their mixing ratios (75-100% and 0-25% mass%) to enhance dispersibility and printability, while packing them in separate containers to improve packability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the viscosity of A agent and B agent is reduced to enhance dispersibility, then dispersibility improves, but the mixture becomes too thin for screen printing
Solution Approach 1:
The patent applies parameter changes by precisely controlling the viscosity of A agent within 50-200 dPa·s and B agent within 100-300 dPa·s at 25°C. This optimized viscosity range ensures that the individual components have sufficient flowability for dispersibility while maintaining adequate thickness for screen printing application. The specific parameter ranges resolve the contradiction by finding the optimal balance point where both dispersibility and printability are satisfied simultaneously.
2Stability of the object's composition
If bead mill dispersion is used to enhance dispersibility, then dispersibility improves, but the viscosity becomes too low for screen printing
Solution Approach 1:
The patent resolves this contradiction through parameter changes by establishing specific viscosity ranges for the individual agents (A agent: 50-200 dPa·s, B agent: 100-300 dPa·s) that account for the effects of dispersion processing. These pre-determined ranges ensure that even after bead mill dispersion reduces viscosity, the final mixture maintains appropriate viscosity for screen printing. This approach eliminates the need for post-dispersion viscosity adjustment while ensuring both dispersibility and printability.
Solution Approach 2:
The patent applies preliminary action by pre-controlling the viscosity of individual agents before mixing and dispersion. By ensuring A agent and B agent are within their respective viscosity ranges prior to combination and bead mill processing, the patent guarantees that the final mixture will have suitable properties for screen printing. This preliminary control of parameters prevents the problem of viscosity becoming too low after dispersion.
3Stability of the object's composition
If separate containers are used for A agent and B agent, then storage stability improves, but packing size increases
Solution Approach 1:
The patent applies segmentation by dividing the curable resin composition into two separate agents (A agent containing carboxyl group-containing resin and B agent containing thermosetting ingredient) that are stored in separate containers. This segmentation prevents premature reaction while maintaining storage stability. The invention resolves the volume contradiction by optimizing the size and design of separate packaging containers, ensuring they are compact enough for cost-effective transportation while maintaining the necessary separation for stability.
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 achieves excellent dispersibility and printability, prevents visible copper phenomena, and reduces packaging size, thereby lowering transportation costs and improving handling efficiency.
Implementation Method 1
a cross-linking reaction between the carboxyl group-containing resin and the thermosetting ingredient enhances the cross-linking density
Data Source
AI summary
[Problem] Provided is a two-component type curable resin composition that allows a mixture of an A agent and a B agent to have excellent dispersibility and printability, causes no visible-copper phenomenon, and provides an excellent packing form (receivability) for transportation.[Solution] A two-component type curable resin composition according to the present invention is characterized by including: an A agent containing a carboxyl group-containing resin; and a B agent containing a thermosetting ingredient,wherein the A agent has a viscosity value in the range of 50 dPa·s or more and 200 dPa·s or less at 25° C. at 5 rpm,wherein the B agent has a viscosity value in the range of 100 dPa·s or more and 300 dPa·s or less at 25° C. at 5 rpm,wherein the dispersity of a mixture of the A agent and the B agent is 20 μm or less on a grind gauge, andwherein, with respect to the total amount of the A agent and the B agent, the mixing ratio of the A agent is 75 mass % or more and less than 100 mass %, and the mixing ratio of the B agent is more than 0 mass % and 25 mass % or less.