Heat Conductive Sheet Monomer Composition for High Thermal Transfer
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Solution Overview
Problem
Existing heat conductive sheet technologies face challenges in achieving high heat conductivity while maintaining sufficient softness and cohesive strength, often resulting in low flexibility and surface defects when high amounts of heat conductive fillers are used, leading to issues with handling and re-bonding.
Innovation Solution
A monomer composition comprising a photo polymerizable component, heat conductive filler, photo reaction initiator, and photo absorbent, which is cured using electromagnetic rays to form a heat conductive sheet that balances heat conductivity and softness, avoiding the limitations of high filler viscosity and surface strength issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large amounts of heat conductive filler are packed to improve heat conductivity, then heat transfer rate is improved, but viscosity of the composition becomes extremely high making kneading and molding operations difficult
Solution Approach 1:
The patent changes the chemical composition parameters by using a specific polymer blend (polyester resin and polyurethane resin in a weight ratio of 95:5 to 50:50) and controlling the glass transition temperature of the binder resin to be -50°C or lower. This parameter optimization allows high filler content (70-90 wt%) while maintaining processability during kneading and molding operations.
Solution Approach 2:
The patent creates a composite material system combining polyester resin, polyurethane resin, and heat conductive filler (such as aluminum oxide or aluminum hydroxide). This composite approach leverages the complementary properties of each component: polyester resin provides structural stability, polyurethane resin enhances flexibility and low-temperature performance, and the filler provides heat conduction, achieving both high heat transfer rate and ease of manufacture.
2Reliability
If large amounts of heat conductive filler are packed to improve heat conductivity, then heat transfer rate is improved, but the sheet becomes difficult to handle and re-bond due to low flexibility
Solution Approach 1:
The patent optimizes the glass transition temperature parameter of the binder resin to be -50°C or lower by selecting specific polyester and polyurethane resin combinations. This parameter change ensures the sheet maintains flexibility and softness at low temperatures, enabling easy handling and re-bonding operations while containing high amounts of heat conductive filler for improved heat transfer rate.
3Reliability
If non-silicone type resin is used to avoid contact defects, then reliability is improved, but cohesive strength of the surface portion becomes extremely low causing paste remainder and breakage
Solution Approach 1:
The patent employs a composite resin system combining polyester resin and polyurethane resin in specific proportions (weight ratio 95:5 to 50:50). This composite material approach provides both the reliability benefits of non-silicone resin (avoiding contact defects) and sufficient cohesive strength through the synergistic interaction between the two resin components, preventing paste remainder and breakage during handling and re-bonding.
Solution Approach 2:
The patent adjusts the compositional parameters of the binder resin by controlling the ratio of polyester to polyurethane resin and optimizing the glass transition temperature to -50°C or lower. These parameter changes enhance the cohesive strength of the surface portion while maintaining the advantages of non-silicone resin, resolving the contradiction between reliability and strength.
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 high heat conductivity, improved flexibility, and sufficient cohesive strength, enabling safe handling and easy re-bonding without surface defects, while also ensuring flame resistance and low contamination risk.
Implementation Method 1
a photo reaction initiator for initiating the polymerization of the photo polymerizable component
Implementation Method 2
a photo absorbent for absorbing and at least partially removing a predetermined wavelength band from electromagnetic rays used for the polymerization of the photo polymerizable component
Implementation Method 3
heat conductive filler; The heat conductive sheet according to the invention is useful as a heat radiation sheet
Data Source
AI summary
To provide a composition useful for forming a heat conductive sheet that satisfies both high heat conductivity and sufficient softness, has sufficient cohesive strength at a surface portion of a heat conductive sheet and does not cause remaining paste and breakage of an electronic appliance when the sheet is peeled. The composition comprises (A) a photo polymerizable component consisting of a (meth)acryl type monomer or its partial polymer; (B) a heat conductive filler; (C) a photo reaction initiator for initiating the polymerization of the photo polymerizable component; and (D) a photo absorber for absorbing and removing a predetermined wavelength band from electromagnetic rays used for the polymerization of the photo polymerizable component.