Polyisobutylene Thermal Interface Material for Silicon Bleeding Prevention
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Solution Overview
Problem
Current thermal interface materials face issues such as silicon bleeding, contamination, low thermal conductivity, and high hardness, which hinder effective heat transfer between heat-generating devices and heat sinks.
Innovation Solution
A composition comprising polyisobutylene, a reactive diluent mixture, a catalyst, and thermally conductive fillers, with a specific ratio of mono-substituted to multi-substituted alkene structures, and a silicone-based cross-linker, which forms a low-viscosity, easy-to-handle thermal interface material with high thermal conductivity and low hardness, preventing bleeding and migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicon-containing thermal interface materials are used, then thermal conductivity is improved, but silicon bleeding and outgassing occur causing contamination
Solution Approach 1:
The patent removes silicon from the polymer matrix entirely, extracting the harmful element while preserving thermal conductivity through alternative filler materials such as aluminum oxide, aluminum nitride, boron nitride, or diamond particles dispersed in a non-silicon polymer base.
Solution Approach 2:
The invention creates a composite material system combining non-silicon polymer matrix with high thermal conductivity fillers, achieving both contamination-free operation and effective heat transfer through synergistic material composition.
2Object-generated harmful factors
If non-silicon containing thermal interface materials are used, then silicon bleeding is prevented, but thermal conductivity decreases and hardness increases
Solution Approach 1:
The patent modifies the physical and chemical parameters of the thermal interface material by adjusting filler particle size distribution, filler loading concentration, and polymer matrix composition to optimize both thermal conductivity and softness in silicon-free formulations.
Solution Approach 2:
The invention employs composite material design with optimized ratios of different filler types and polymer matrices to achieve high thermal conductivity without relying on silicon, while maintaining appropriate hardness and compliance.
3Reliability
If high filler loading is used to improve thermal conductivity, then thermal performance is improved, but viscosity increases and ease of handling decreases
Solution Approach 1:
The patent applies local quality by using a distribution of filler particle sizes where fine particles fill voids between larger particles, optimizing thermal pathways while maintaining lower overall filler loading and acceptable viscosity for handling.
Solution Approach 2:
The invention changes the parameter of filler particle size distribution and loading concentration to balance thermal conductivity enhancement with maintainable viscosity levels that allow easy application and spreading.
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 material exhibits low thermal resistance, high thermal conductivity, and excellent thermal stability, maintaining conductivity and stability even after prolonged thermal testing, with no air trapped between components, ensuring efficient heat dissipation.
Implementation Method 1
thermally conductive fillers in a polymer matrix
Implementation Method 2
reactive diluent mixture comprises one or more diluent with a mono-substituted alkene structure, and one or more diluent with a multi-substituted alkene structure
Implementation Method 3
a silicone based cross-linker
Data Source
AI summary
Provided herein is a composition for use as a thermal interface material in a heat-generating device. The composition comprises a first part and a second part, the first part comprising polyisobutylene, a reactive diluent mixture, a catalyst, and one or more thermally conductive fillers, and the second part comprising polyisobutylene, the reactive diluent mixture, a silicone based cross-linker, an inhibitor and one or more thermally conductive fillers.