Metal-Resin Composite Bonding for High-Temperature Adhesion

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Solution Overview

Problem

Conventional adhesion techniques between metal and polyolefin resins suffer from decreased adhesive strength at high temperatures, limiting their use in various applications requiring sufficient bonding across a wide temperature range.

Innovation Solution

A metal-resin composite comprising a layer of a metal material and a polymer composition containing carbodiimide-modified polyolefin, with specific carbodiimide group content and density, and optionally high-density polymers, ensuring enhanced adhesive strength at both room and high temperatures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If conventional adhesion techniques (grafting unsaturated carboxylic acid to polyolefin) are used, then adhesive strength at room temperature is improved, but adhesive strength at high temperature decreases

Engineering Contradiction:

Improveadhesive strengthVSAvoidadhesive strength at high temperature

Core Design Contradiction:

StrengthVSTemperature

Solution Approach 1:

The invention changes the chemical parameter of the polyolefin by introducing carbodiimide groups through reaction with carbodiimide compounds. This chemical modification transforms the non-polar polyolefin into a material with polar carbodiimide functional groups, fundamentally altering its adhesion properties to achieve high-temperature resistance while maintaining room-temperature bonding capability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite material system combining polyolefin base material with carbodiimide functional groups. This composite structure integrates the advantages of both components: the polyolefin provides mechanical strength and processability, while the carbodiimide groups provide thermal stability and enhanced adhesion at elevated temperatures

Inventive Principle:

Principle #40Composite materials

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 composite achieves superior adhesive strength at high temperatures while maintaining ease of peeling at room temperature, suitable for applications requiring durability and recyclability.

Implementation Method 1

a carbodiimide-modified polyolefin formed by reaction of a polyolefin (a) having a group reactive with a carbodiimide group and a carbodiimide group-containing compound (b) is contained

Methodology Applied

Scientific EffectChemical reaction: Chemical Bonding

Data Source

PatentEP4691761A1Metal resin composite body and method for producing same

Publication Date: 2026.02.11 MITSUI CHEMICALS INC

AI summary

Provided is a metal-resin composite having sufficient adhesive strength between a metal material and a polymer composition. The present invention relates to a metal-resin composite including a layer (AL) composed of a metal material (A), and a layer (BL) composed of a polymer composition (B) that satisfies the following requirements (i) and (ii), and a method for producing the metal-resin composite. (i) A carbodiimide-modified polyolefin formed by reaction of a polyolefin (a) having a group reactive with a carbodiimide group and a carbodiimide group-containing compound (b) is contained. (ii) Carbodiimide groups are contained in an amount of 0.1 to 50 mmol per 100 g of the polymer composition (B).