Poly(styrene-co-allyl alcohol) Adhesives for Microelectronic Packaging
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Solution Overview
Problem
The microelectronics industry faces challenges in developing adhesives that can effectively bond thin semiconductor dies in stacked configurations without compromising their integrity, requiring materials with high mechanical strength, low ionic impurities, and resistance to hydrolysis, while also being suitable for various industrial applications.
Innovation Solution
The development of thermosetting adhesive compositions based on poly(styrene-co-allyl alcohol) oligomers, which are low in ionic impurities and resistant to hydrolysis, allowing for the creation of high-cross-link-density monomers that can be easily functionalized and cured using multiple mechanisms, suitable for use in microelectronic packaging, as well as other industrial applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional adhesives are used for bonding thin semiconductor dies, then bonding capability is achieved, but mechanical strength and integrity of thin die are compromised
Solution Approach 1:
The patent modifies the chemical structure of poly(styrene-co-allyl alcohol) oligomers by converting pendant alcohol groups into various functional groups (acrylates, methacrylates, epoxy, oxetane, anhydride, etc.), thereby changing the adhesive's bonding parameters to achieve high mechanical strength while preserving thin die integrity
Solution Approach 2:
The invention creates composite adhesive systems by combining functionalized poly(styrene-co-allyl alcohol) oligomers with crosslinking agents and initiators, forming a composite material that provides both strong bonding capability and structural support for thin semiconductor dies
2Strength
If adhesives with high mechanical strength are used, then bonding capability improves, but ionic impurities increase affecting electronic components
Solution Approach 1:
The patent applies local quality by ensuring the adhesive formulation contains minimal ionic impurities in critical areas while maintaining high bonding strength through carefully selected organic functional groups and crosslinking mechanisms that do not introduce harmful ionic contaminants
Solution Approach 2:
The invention creates an inert chemical environment by using organic-based functional groups and crosslinking agents that do not generate ionic impurities, thereby protecting electronic components from ionic contamination while achieving strong bonding
3Duration of action of stationary object
If adhesives resistant to hydrolysis are used, then durability improves, but material selection and formulation complexity increase
Solution Approach 1:
The patent achieves hydrolysis resistance by changing the chemical parameters of the adhesive formulation, specifically by using carbon-based backbones and non-hydrolyzable functional groups (acrylates, methacrylates, epoxy, oxetane) that are inherently resistant to hydrolysis, thereby simplifying the formulation while ensuring long-term durability
4Area of stationary object
If stacked die configuration is used to increase component density, then circuit board area is conserved, but adhesive requirements for thin die integrity become more stringent
Solution Approach 1:
The patent employs the flexible shells and thin films principle by developing adhesives with controlled rheological properties that can be applied as thin, uniform films, enabling precise adhesive application in stacked die configurations while maintaining die integrity and conserving circuit board area
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
These adhesive compositions provide strong bonding capabilities for thin semiconductor dies, offer high thermal resistance, and are versatile for use in multiple industrial applications, including microelectronic packaging, automotive, aerospace, and dental matrices, ensuring the integrity and performance of electronic components.
Implementation Method 1
The alcohol moieties are usually converted in one step to the compounds described in this invention. Optionally, the alcohol moieties in the backbone may be converted to an intermediate functional group (such as a chloride, bromide, iodide, mesylate, tosylate, brosylate, triflate, and the like) which can be further reacted to make the desired functionalized oligomer.
Data Source
AI summary
The invention provides derivatives of poly(styrene-co-allylalcohol). These materials are useful as thermosetting monomers that can be incorporated into adhesive compositions. In some embodiments, the adhesive compositions are useful in the microelectronic packaging industry.