Tin-Epoxy Conductive Resin Composition for Low Resistivity Adhesion
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Solution Overview
Problem
Conductive resin compositions face challenges in achieving low volume resistivity and excellent adhesion to various base materials, with silver particles being costly and other conductive particles leading to high volume resistivity and insufficient bonding strength.
Innovation Solution
A conductive resin composition comprising tin powder, epoxy resin, and an organic acid compound, with a tin powder content of 90.1% or higher, and optionally including acid anhydride, thiol, or phenol-based curing agents, to achieve low volume resistivity and strong adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silver particles are used as conductive particles, then volume resistivity is reduced and conductivity is improved, but cost increases significantly
Solution Approach 1:
The patent replaces expensive silver particles with inexpensive tin powder as the conductive filler. This substitution dramatically reduces material cost while maintaining adequate conductivity for the application. The tin powder, though less conductive than silver, provides sufficient electrical performance when used in high concentrations (90.1-99.9 wt%), making it a cost-effective alternative for conductive adhesives and circuit connection materials.
Solution Approach 2:
The patent changes the key parameter of conductive filler from silver to tin powder, and adjusts the concentration parameter to 90.1 wt% or higher. This parameter change enables the use of a cheaper material (tin instead of silver) while achieving the required conductivity through optimized composition ratios, particularly by combining tin powder with epoxy resin and organic acid compounds.
2Quantity of substance
If conductive particles other than silver are used to reduce cost, then cost decreases, but volume resistivity increases and conductivity becomes insufficient
Solution Approach 1:
The patent optimizes the concentration parameter of tin powder to 90.1 wt% or higher, which is substantially higher than conventional formulations. This high concentration compensates for the lower intrinsic conductivity of tin compared to silver, achieving sufficient overall conductivity. Additionally, the patent adjusts the resin and additive parameters to support this high filler loading while maintaining processability and electrical performance.
Solution Approach 2:
The patent creates a composite material system combining tin powder, epoxy resin, and organic acid compounds (such as carboxylic acids, sulfonic acids, or phosphonic acids). This composite formulation enhances the overall electrical conductivity and adhesion properties, allowing the use of inexpensive tin powder to replace silver while meeting conductivity requirements through synergistic material interactions.
3Reliability
If a lot of conductive particles are contained to lower volume resistivity, then conductivity is improved, but adhesion and bonding strength decline
Solution Approach 1:
The patent introduces organic acid compounds (carboxylic acids, sulfonic acids, or phosphonic acids) as intermediary substances that enhance the interaction between tin powder particles and the epoxy resin matrix. These compounds improve wetting and adhesion at the interface, allowing high concentrations of conductive filler to be incorporated without sacrificing bonding strength. The organic acid acts as a mediator that maintains adhesion even with 90.1 wt% or higher filler loading.
Solution Approach 2:
The patent develops a composite material system where tin powder, epoxy resin, and organic acid compounds work synergistically. The organic acid compound component specifically addresses the adhesion problem by improving interfacial bonding, enabling the formulation to maintain both high conductivity (through high tin content) and strong adhesion (through the organic acid mediator), resolving the trade-off between these two properties.
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 demonstrates good conductivity and excellent adhesion, making it suitable for use in conductive inks, adhesives, and circuit connection materials, particularly in mass-producing display devices and electronic equipment.
Implementation Method 1
a conductive resin composition containing (a) tin powder, (b) epoxy resin, and (c) organic acid compound
Implementation Method 2
conductive resin compositions containing resins and conductive particles
Data Source
AI summary
A conductive resin composition contains (a) tin powder, (b) epoxy resin, and (c) organic acid compound, and satisfies requirement (A) and/or requirement (B): (A) the content of the (a) tin powder, relative to the total amount, 100% by mass, of the (a) tin powder, (b) epoxy resin, and (c) organic acid compound, is 90.1% by mass or higher; and/or (B) (d) curing agent is contained, and (d) curing agent includes one or more types selected from (d1) acid anhydride-based curing agents, (d2) thiol-based curing agents and (d3) phenol-based curing agents. The conductive resin composition is intended to demonstrate good conductivity and excellent adhesion with respect to various types of base materials and to be useful as conductive inks, conductive adhesives, circuit connection materials, etc.