Pressure Sensitive Adhesive Crosslinking for Temperature Resistance
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Solution Overview
Problem
Conventional pressure sensitive adhesives lack effective adhesion over a wide temperature range and cohesive strength, failing to meet the Dahlquist criteria for surface tack and shear strength at varying temperatures.
Innovation Solution
A pressure sensitive adhesive composition is developed, comprising a blend of an acrylate polymer with a glass transition temperature (Tg) less than 20°C and a molecular weight greater than 20,000, combined with a liquid oligomer having crosslinkable functional groups and a crosslinking agent, where at least one of the components is crosslinked in the presence of the other, along with expandable microspheres for foam articles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pressure sensitive adhesives are used, then the adhesive can be applied to substrates, but it lacks effective adhesion and cohesive strength over a wide temperature range
Solution Approach 1:
The patent changes the chemical parameters of the adhesive by incorporating crosslinkable functional groups (such as silane, epoxy, or isocyanate groups) into the polymer and oligomer structures. This allows the adhesive to undergo crosslinking reactions that fundamentally alter its physical and chemical properties, enabling it to maintain adhesion effectiveness across a wide temperature range from -40°F to 200°F
Solution Approach 2:
The patent creates a composite adhesive system by blending a polymer with crosslinkable functional groups and an oligomer with complementary crosslinkable groups. This composite structure combines the benefits of both components: the polymer provides base adhesive properties while the oligomer enhances flexibility and adhesion, and their crosslinkable groups create a unified crosslinked network that delivers superior temperature resistance and cohesive strength
2Strength
If conventional pressure sensitive adhesives are used, then the adhesive can be formulated with standard components, but it lacks cohesive strength
Solution Approach 1:
The patent introduces crosslinkable functional groups into the adhesive formulation, which undergo crosslinking reactions to create a three-dimensional network structure. This fundamental parameter change transforms the adhesive from a simple linear polymer structure to a crosslinked composite structure, dramatically increasing cohesive strength while the crosslinking agents serve as straightforward additives that simplify the overall formulation approach
3Reliability
If the adhesive meets Dahlquist criteria for surface tack, then it provides initial bonding, but it fails to maintain adhesion at varying temperatures
Solution Approach 1:
The patent formulates a composite adhesive system combining a polymer with crosslinkable functional groups and an oligomer with complementary crosslinkable groups. This composite structure maintains surface tack properties necessary for initial bonding while the crosslinking network provides temperature resistance. The formulation remains relatively simple as it uses standard polymer and oligomer components that can be blended and crosslinked using conventional processes
Solution Approach 2:
The patent modifies the adhesive formulation by incorporating crosslinkable functional groups into the polymer and oligomer structures. This parameter change enables the adhesive to undergo crosslinking reactions that create a temperature-resistant network while preserving initial tack properties. The crosslinking agents used are straightforward additives that maintain ease of manufacture through conventional adhesive formulation and application processes
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 adhesive composition exhibits high adhesion and cohesive strength across a wide temperature range, meeting the Dahlquist criteria and demonstrating improved shear strength and temperature resistance, suitable for various applications including foam articles.
Implementation Method 1
at least one of (a) and (b) is crosslinked in the presence of the other
Data Source
AI summary
A pressure sensitive adhesive formed from a blend of an acrylate polymer having at least one crosslinkable functional group, and a liquid oligomer having at least one crosslinkable functional group, wherein at least one of the acrylate polymer and the oligomer is crosslinked in the presence of the other.