Siloxane Adhesive Layers Ceramic Conversion
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Solution Overview
Problem
Current pressure sensitive adhesives lack the advanced performance requirements of modern industries, such as optical transparency and high temperature stability, and are not easily convertible into ceramic-like layers for enhanced adhesion and durability.
Innovation Solution
Development of siloxane-based copolymer adhesive layers that are pressure sensitive at room temperature but can be converted into ceramic-like layers by baking at temperatures between 100-500°C, utilizing siloxane tackifying resins and specific linking groups like urea, urethane, or cured (meth)acrylate linkages, allowing for both adhesive and structural properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pressure sensitive adhesives are used, then adhesive properties (tack, peel strength, shear holding power) are achieved, but high temperature stability and optical transparency are insufficient
Solution Approach 1:
The patent employs composite materials by combining siloxane-based copolymers with specific additives and fillers to achieve both high temperature stability and optical transparency. The siloxane polymer matrix provides thermal stability while transparent fillers and carefully selected additives maintain optical clarity, creating a multi-functional adhesive composition that resolves the contradiction between reliability under extreme conditions and ease of manufacture.
Solution Approach 2:
The patent utilizes parameter changes by modifying the chemical composition and molecular structure of the adhesive to transition from conventional hydrocarbon-based polymers to siloxane-based polymers. This fundamental parameter change in the polymer backbone structure enables high temperature stability while maintaining adhesive properties, and through controlled composition and curing, optical transparency is achieved, thus resolving the contradiction between reliability and manufacturing complexity.
2Adaptability or versatility
If conventional adhesives are used, then room temperature adhesion is achieved, but convertibility into ceramic-like layers is not possible
Solution Approach 1:
The patent applies universality by designing the siloxane-based adhesive to perform multiple functions: it acts as a pressure-sensitive adhesive at room temperature for bonding applications, and simultaneously serves as a precursor material that can be converted into ceramic-like layers through thermal processing. This multi-functionality is achieved by incorporating ceramic-forming components and reactive groups in the siloxane polymer structure, allowing the same material to fulfill both adhesive and structural ceramic precursor roles without requiring separate materials or excessively complex processing.
3Reliability
If siloxane-based copolymer adhesive layers are developed to be convertible into ceramic-like layers, then high temperature stability and optical transparency are improved, but adhesive formulation complexity increases
Solution Approach 1:
The patent applies local quality by carefully controlling the distribution and concentration of different components within the siloxane-based adhesive formulation. Specific transparent fillers, ceramic precursors, and additives are incorporated at optimized local concentrations to ensure optical transparency in the final cured adhesive while maintaining adhesive performance. This localized optimization of composition allows the achievement of optical clarity without requiring overly complex overall formulation, thus resolving the contradiction between reliability (optical transparency) and ease of manufacture.
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 siloxane-based adhesive layers provide improved tack, peel strength, and shear holding power while being optically clear and convertible into ceramic-like layers for strong, high-temperature adhesion, meeting the demanding requirements of industries like electronics and semiconductors.
Implementation Method 1
The adhesive layer is convertible into a ceramic-like layer by baking-out at a temperature of from 100-500° C.
Implementation Method 2
Pressure sensitive adhesives are well known to one of ordinary skill in the art to possess certain properties at room temperature including the following: (1) aggressive and permanent tack, (2) adherence with no more than finger pressure, (3) sufficient ability to hold onto an adherend, and (4) sufficient cohesive strength
Data Source
AI summary
Transfer tapes include a releasing substrate and an adhesive layer adjacent to the surface of the releasing substrate. The adhesive layer includes a at least one siloxane-based copolymer, and at least one siloxane tackifying resin. The adhesive layer is a pressure sensitive adhesive at room temperature and is convertible into a ceramic-like layer by bake-out at a temperature of from 100-500°.