High Temperature Pressure Sensitive Adhesive with Silane Crosslinking
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Solution Overview
Problem
Pressure-sensitive adhesives (PSAs) face challenges in maintaining high performance and mechanical properties at elevated temperatures, leading to mechanical failures and issues like bubbling, peeling, and micro-wrinkling in optical laminates, especially in high-temperature and high-humidity environments.
Innovation Solution
A pressure-sensitive adhesive is developed using a reactive product of a copolymer of alkyl(meth)acrylate, a multifunctional cross-linker, and at least one of an amine-containing (meth)acrylate and a blocked isocyanate-containing (meth)acrylate, which maintains high modulus and low tan delta at high temperatures, preventing mechanical failures and out-gassing while retaining adhesion and optical clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional acrylate PSAs are used, then cost-effectiveness and adhesion to various surfaces are improved, but high temperature performance deteriorates leading to mechanical failures
Solution Approach 1:
The patent uses a composite adhesive system combining acrylic polymer base resin with silane crosslinking agents and metal oxide particles. This composite structure allows the adhesive to maintain the cost-effectiveness and adhesion properties of acrylic PSAs while adding high-temperature stability through the inorganic crosslinking network that prevents polymer chain mobility at elevated temperatures.
Solution Approach 2:
The patent fundamentally changes the chemical and physical parameters of the adhesive by introducing silane crosslinking chemistry. The silane groups form a three-dimensional crosslinked network that transforms the adhesive from a linear polymer structure to a gel-like network, dramatically increasing glass transition temperature and maintaining mechanical properties at high temperatures where conventional acrylates fail.
2Illumination intensity
If optical grade PSAs are used in optical laminates, then optical clarity is improved, but resistance to bubbling and peeling at high temperatures deteriorates
Solution Approach 1:
The patent creates an optically clear composite adhesive containing silane crosslinking agents and metal oxide particles dispersed in an acrylic polymer matrix. The inorganic crosslinked network provides thermal stability and prevents outgassing that causes bubbling, while the acrylic base maintains optical clarity. The metal oxide particles enhance heat resistance without compromising transparency.
Solution Approach 2:
The silane crosslinking creates a preliminary protective network that prevents the adhesive and substrate materials from outgassing and forming bubbles under high-temperature conditions. The crosslinked structure restricts molecular mobility and prevents the formation of volatile byproducts that would cause bubbling and peeling failures in conventional optical PSAs.
3Reliability
If adhesive formulations are modified to improve high temperature performance, then heat resistance is improved, but adhesion strength at room temperature may deteriorate
Solution Approach 1:
The patent creates a dynamic adhesive system where the silane crosslinking density and metal oxide particle distribution can be optimized to provide different levels of flexibility at different temperatures. The crosslinked network provides rigidity at high temperatures for heat resistance, while the acrylic polymer matrix maintains flexibility and adhesion at room temperature, achieving temperature-dependent mechanical properties.
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 exhibits improved high-temperature performance with enhanced adhesion, out-gassing resistance, and bubble resistance without compromising mechanical properties at room temperature, maintaining optical clarity and preventing micro-wrinkles over the lifetime of the application.
Implementation Method 1
a reactive product of a copolymer of an alkyl(meth)acrylate, a multifunctional cross-linker, and at least one of an amine-containing (meth)acrylate and a blocked isocyanate-containing (meth)acrylate
Implementation Method 2
reactive product of a copolymer of an alkyl(meth)acrylate, a multifunctional cross-linker, and at least one of an amine-containing (meth)acrylate and a blocked isocyanate-containing (meth)acrylate
Data Source
AI summary
The present invention is a pressure sensitive adhesive including the reactive product of a copolymer of an alkyl(meth)acrylate, a multifunctional cross-linker, and at least one of an amine-containing (meth)acrylate and a blocked isocyanate-containing (meth)acrylate.