Star Polymer Chip Stacking Adhesive Heat Resistance
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Solution Overview
Problem
Existing polymers for chip stacking adhesives lack satisfactory properties such as heat resistance, crack resistance, and high-temperature adhesiveness.
Innovation Solution
A star polymer is developed with a polymer chain containing a specific molar ratio of aryl and acrylic acid repeating units as the arm portion and a polyacrylate-derived core portion, optimized for heat resistance and crack resistance through block bonding and specific molecular weight ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a copolymer consisting of p-hydroxystyrene/styrene/methyl methacrylate is used, then electrical insulation properties are improved, but chip stacking adhesive properties (heat resistance, crack resistance) deteriorate
Solution Approach 1:
The patent employs a star-shaped copolymer composite structure combining aromatic vinyl units (for electrical insulation) with acrylic acid units (for adhesive performance). The star architecture with multiple arms radiating from a core creates a composite material system that integrates the beneficial properties of different monomer units while achieving both electrical insulation and chip stacking adhesive requirements simultaneously.
Solution Approach 2:
The patent applies local quality by creating a star polymer with differentiated regions: the core portion provides structural integrity and thermal stability, while the arm portions containing specific ratios of aromatic vinyl and acrylic acid units provide localized functional properties. This spatial differentiation of polymer chain composition allows simultaneous optimization of electrical insulation (from aromatic vinyl regions) and adhesive properties (from acrylic acid regions).
2Device complexity
If a star polymer with polyacrylate core and block-bonded styrene/(meth)acrylate arms is used, then structural complexity is reduced, but heat resistance and crack resistance deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molar ratio of aromatic vinyl to acrylic acid units within the range of 70:30 to 95:5 in the arm portions, and adjusting the core-to-arm molecular weight ratio. By optimizing these compositional and structural parameters, the patent achieves enhanced heat resistance and crack resistance while maintaining a relatively simple star-shaped architecture, resolving the contradiction between structural simplicity and performance.
3Reliability
If the molar ratio of aromatic vinyl to acrylic acid units is optimized in the arm portion, then adhesion properties are improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent defines a specific molar ratio range (70:30 to 95:5) for aromatic vinyl to acrylic acid units in the arm portions, providing a practical parameter window that balances adhesion performance with manufacturing feasibility. This parameter specification allows manufacturers to achieve satisfactory adhesion properties while accommodating normal variations in polymerization processes, thus resolving the contradiction between performance optimization and manufacturing precision requirements.
Data Source
AI summary
It is an object of the present invention to provide a copolymer for a cured product that is satisfactory in properties, such as adhesion properties, as a chip stacking adhesive or the like. The present invention is a star polymer comprising, as an arm portion, a polymer chain containing repeating units represented by formula (I) and formula (II), and comprising a core portion derived from a monomer represented by formula (III), wherein a molar ratio of the repeating unit represented by formula (I) to the repeating unit represented by formula (II) ((I)/(II)) in the arm portion is in the range of 60/40 to 95/5.