Fine Silver Particle Dispersion Resistivity Stability
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Solution Overview
Problem
Fine silver particle dispersions face challenges in maintaining resistivity stability over time, which affects the performance of conductive thick films in electrical devices.
Innovation Solution
A fine silver particle dispersion comprising 60 to 95 wt.% fine silver particles with a particle diameter of 50 to 300 nm, 4.5 to 39 wt.% solvent, and 0.1 to 3 wt.% resin with a glass transition temperature of 70 to 300°C, where the particles are coated with an organic protective material like amine to prevent sintering, and the dispersion is formulated with specific solvents and resins to enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fine silver particles are dispersed in a solvent to form conductive thick films, then electrical conductivity is achieved, but resistivity stability deteriorates over time
Solution Approach 1:
The patent introduces a specific resin as an intermediary substance between the fine silver particles and the solvent. This resin, with carefully controlled molecular weight (10,000-300,000) and glass transition temperature (70-300°C), acts as a stabilizing agent that prevents particle aggregation and maintains uniform dispersion over time, thereby ensuring resistivity stability during long-term preservation.
Solution Approach 2:
The patent applies parameter changes by precisely controlling multiple parameters of the resin component including molecular weight range (10,000-300,000), glass transition temperature (70-300°C), and content ratio (0.1-3 wt%). By optimizing these parameters, the dispersion maintains its stability characteristics throughout the preservation period, preventing resistivity degradation.
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 dispersion provides preservation stability of resistivity, ensuring consistent performance of conductive thick films even after extended periods, as demonstrated by maintaining comparable resistivity values over 100 days.
Implementation Method 1
the particles are coated with an organic protective material like amine to prevent sintering
Implementation Method 2
0.1 to 3 wt.% resin, wherein the glass transition temperature (Tg) of the resin is 70 to 300° C.
Data Source
AI summary
This disclosure relates to a fine silver particle dispersion comprising: (i) 60 to 95 wt. % of fine silver particles, wherein particle diameter (D50) of the fine silver particles is 50 to 300 nm, (ii) 4.5 to 39 wt. % of a solvent; and (iii) 0.1 to 3 wt. % of a resin, wherein the glass transition temperature (Tg) of the resin is 70 to 300° C., wherein the weight percentages are based on the weight of the fine silver particle dispersion.