Solvent Resistant Polyurethane Adhesive Laminate

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Solution Overview

Problem

Current adhesive technologies lack solvent resistance, particularly in applications exposed to aromatic aliphatic solvents and oils, such as automotive, aerospace, and laboratory labels, where existing adhesives fail to maintain performance and integrity.

Innovation Solution

A laminate with a backing material coated using an adhesive composition of hydroxyl or urea terminated unsaturated polyurethane or polyurethane-urea, crosslinked with a peroxide or silicone hydride, providing enhanced solvent resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional pressure sensitive or heat activated adhesives are used, then adhesive properties are well suited for use with labels on various substrates, but they are not solvent resistant and fail to maintain performance in harsh chemical environments

Engineering Contradiction:

Improvesolvent resistanceVSAvoidadhesive failure in chemical environments

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent modifies the chemical structure of polyurethane adhesives by incorporating aromatic rings into the polymer backbone and terminal groups, changing the molecular parameters to achieve solvent resistance while maintaining adhesive properties

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite adhesive system combining polyurethane polymer chains with aromatic structural motifs, integrating multiple functional characteristics (adhesion, flexibility, and chemical resistance) into a single material system

Inventive Principle:

Principle #40Composite materials

2Stability of the object's composition

If adhesive compositions are exposed to aromatic aliphatic solvents and oils, then adhesive failure occurs, but the invention maintains adhesive integrity through crosslinked aromatic polyurethane structures

Engineering Contradiction:

Improveadhesive integrityVSAvoidsolvent exposure

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful effect of solvent exposure into a beneficial design criterion by incorporating aromatic structures that are specifically resistant to aromatic solvents, turning the previously problematic chemical environment into a testable performance parameter

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The aromatic polyurethane structure creates an chemically inert adhesive layer that resists penetration and degradation by external solvents and oils, maintaining adhesive integrity in harsh chemical environments

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

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 solution achieves superior solvent resistance and durability, as demonstrated by extended lap shear testing in various solvents, maintaining adhesive properties and integrity even in harsh chemical environments.

Implementation Method 1

crosslinked with a peroxide or silicone hydride

Methodology Applied

Scientific EffectPeroxide crosslinking:

Implementation Method 2

crosslinked with a peroxide or silicone hydride

Methodology Applied

Scientific EffectSilicone hydrosilylation crosslinking:

Data Source

PatentUS8178614B2Laminate containing solvent resistant polyurethane adhesive compositions

Publication Date: 2012.05.15 MOMENTIVE PERFORMANCE MATERIALS INC

AI summary

A laminate includes a backing material coated with a solvent resistant adhesive composition. The adhesive composition includes a hydroxyl or urea or hydrocarbon terminated unsaturated polyurethane or polyurethane-urea polymer and a peroxide or a silicone hydride.