Alternating Copolymer Adhesive for Thermal Shock Resistance
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Solution Overview
Problem
Existing die bonding agents lack sufficient thermal shock resistance and flexibility, particularly for lead-free solder applications and area array packaging, where non-silicone materials are desirable and compatibility with silicones is limited.
Innovation Solution
An adhesive composition comprising an alternating copolymer with alcoholic hydroxyl groups, an epoxy resin with at least two glycidyl groups, and a curing promoter, which reacts to form a flexible and thermal shock-resistant cured product, suitable for bonding chips to substrates or other chips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a silicone-based flexibilizer is used to improve thermal shock resistance, then thermal shock resistance is improved, but material compatibility is limited and non-silicone applications are restricted
Solution Approach 1:
The invention changes the chemical structure parameter by using an alternating copolymer with alcoholic hydroxyl groups instead of silicone-based flexibilizers. This structural parameter change enables the adhesive to achieve thermal shock resistance through non-silicone materials, expanding material compatibility while maintaining the desired thermal performance
Solution Approach 2:
The invention creates a composite adhesive system combining the alternating copolymer (providing flexibility and thermal shock resistance), epoxy resin (providing adhesion and strength), and curing promoter (enabling crosslinking). This composite approach achieves both thermal shock resistance and broad material compatibility without relying on silicone
2Reliability
If the adhesive is made more flexible to improve thermal shock resistance, then thermal shock resistance is improved, but adhesion strength may be reduced
Solution Approach 1:
The invention combines two materials with complementary properties: the alternating copolymer provides flexibility and thermal shock resistance, while the epoxy resin provides strong adhesion and structural integrity. The synergistic interaction between these components achieves both flexibility and strong adhesion simultaneously
Solution Approach 2:
The adhesive system exhibits local quality differentiation where the copolymer segments provide localized flexibility for thermal shock resistance, while the epoxy resin segments provide localized strong adhesion. This spatial differentiation of properties within the composite material resolves the contradiction between flexibility and strength
3Temperature
If a higher reflow temperature is used for lead-free solder, then soldering performance is improved, but thermal shock resistance requirement increases
Solution Approach 1:
The adhesive is pre-formulated with the alternating copolymer and epoxy resin combination specifically designed to withstand high reflow temperatures and subsequent thermal shock. This preliminary preparation of the adhesive composition ensures it can handle the thermal demands of lead-free soldering processes before the actual soldering occurs
Solution Approach 2:
The invention changes the thermal performance parameters of the adhesive by incorporating the alternating copolymer structure, which provides thermal stability and shock resistance. This parameter change enables the adhesive to withstand both the high reflow temperature during soldering and the subsequent thermal shock during operation
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 composition provides a flexible and thermally resistant bond with improved adhesion strength, suitable for high-reflow temperature applications and thermal cycle testing, enhancing the reliability of semiconductor devices.
Implementation Method 1
The alcoholic hydroxyl group of the component (A) reacts with the epoxy resin (B) to form a flexible and thermal shock resistant cured product
Data Source
AI summary
An adhesive composition comprising100 parts by weight of (A) an alternating copolymer composed of repeating units having alcoholic hydroxyl groups and represented by the following formula (1):10 to 1,000 parts by weight of (B) an epoxy resin having at least two glycidyl groups per molecule, and0.1 to 10 parts by weight of (C) a curing promoter. The composition is particularly suitable as a die bonding agent.