Conductive Die Attach Composition for Copper and Nickel Adhesion

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing die attach materials face adhesion inconsistency on copper, nickel, and nickel alloy leadframes, particularly under harsh environmental conditions, leading to performance inconsistencies and a long-standing unmet need for improved adhesion and reliability in semiconductor devices.

Innovation Solution

A conductive die attach composition comprising a resin with maleimide, itaconimide, or nadimide functional groups, an epoxy component, a (meth)acrylate component, an aromatic anhydride, and a conductive filler, which enhances adhesion and solder reflow performance when cured under elevated temperature and humidity conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional die attach materials are used on copper, nickel, and nickel alloy leadframes, then the materials can be applied widely due to the leadframe's high CTE, thermal dissipation, and thermal conductivity, but adhesion inconsistency occurs particularly under harsh environmental conditions

Engineering Contradiction:

Improveadhesion consistencyVSAvoidenvironmental condition sensitivity

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent modifies the chemical composition parameters of the die attach material by incorporating specific resins (polyester, polyimide, or phenolic), coupling agents (silane or titanate), and antioxidants. These parameter changes in material composition enable consistent adhesion to copper, nickel, and nickel alloy leadframes under harsh environmental conditions including temperature cycling and humidity exposure.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite die attach material system combining multiple functional components: resin base materials, coupling agents for enhanced bonding, conductive fillers for electrical connectivity, and antioxidants for environmental stability. This composite approach resolves the adhesion inconsistency by integrating materials that collectively address both bonding strength and environmental resistance.

Inventive Principle:

Principle #40Composite materials

2Manufacturing precision

If existing die attach materials are used, then manufacturing can proceed with current processes, but performance consistency remains elusive despite efforts to overcome deficiencies

Engineering Contradiction:

Improveperformance consistencyVSAvoidadhesion performance

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent specifies precise compositional parameters including resin types (polyester, polyimide, or phenolic), coupling agent categories (silane or titanate), and additive formulations. These controlled parameter changes ensure consistent performance across manufacturing batches while maintaining reliable adhesion to metal leadframes under varying environmental conditions.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces coupling agents (silane or titanate) as intermediary substances that mediate the bonding interface between the die attach material and the metal leadframe surface. These intermediaries enhance chemical adhesion and improve performance consistency by creating a stable transition layer that resists environmental degradation.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Strength

If die attach materials are designed for strong adhesion, then bonding strength improves, but the complexity of material formulation increases

Engineering Contradiction:

Improvedie shear strengthVSAvoidmaterial formulation complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent achieves high die shear strength by optimizing key compositional parameters: selecting from specific resin families (polyester, polyimide, phenolic), incorporating coupling agents (silane/titanate) at controlled levels, and adding conductive fillers and antioxidants. These parameter changes deliver strong adhesion while maintaining manageable formulation complexity through systematic material selection.

Inventive Principle:

Principle #35Parameter changes

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 demonstrates significantly improved die shear strength on copper and nickel leadframes, exceeding 200% after exposure to 85-125°C and 85-100% humidity, compared to compositions without the aromatic anhydride, ensuring robust bonding and reliability.

Implementation Method 1

a resin comprising those containing one or more maleimide, itaconimide or nadimide functional groups or combinations of said functional groups

Methodology Applied

Scientific EffectChemical bonding: Chemical Bonding

Implementation Method 2

a conductive filler

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 3

An epoxy component

Methodology Applied

Scientific EffectPolymerization: Photopolymerisation

Data Source

PatentUS20260062595A1Conductive die attach compositions

Publication Date: 2026.03.05 HENKEL KGAA

AI summary

Provided herein is a conductive die attach composition comprising:A resin comprising those containing one or more maleimide, itaconimide or nadimide functional groups or combinations of said functional groups;An epoxy component;A (meth)acrylate component;An aromatic anhydride; andA conductive filler.