Optical Adhesive Layer Bubble and Yellowing Resistance via Monomer Ratios

Solution Overview

Problem

Existing optical transparent adhesive layers fail to achieve a balance between bubble resistance and yellowing resistance, leading to poor comprehensive performance that cannot meet market demands for higher quality adhesives.

Innovation Solution

A composition comprising (meth)acrylate monomer, hydroxyl-containing monomer, and high Tg monomer, with specific weight ratios and initiators, is used to prepare an optical transparent adhesive layer that exhibits excellent bubble resistance and yellowing resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing optical transparent adhesive layers are designed to have bubble resistance, then they can resist bubbles effectively, but they are prone to yellowing during use

Engineering Contradiction:

Improvebubble resistanceVSAvoidyellowing

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent employs a composite adhesive system comprising multiple monomers (acrylate monomer, hydroxyl-containing monomer, and high Tg monomer) with specific weight ratios. This composite formulation integrates the benefits of each component: acrylate provides adhesion, hydroxyl groups enhance polarity and bonding, and high Tg monomers maintain structural stability at elevated temperatures, collectively achieving both bubble resistance and yellowing resistance

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent optimizes specific parameters including the weight ratio of acrylate monomer to hydroxyl-containing monomer (1:1 to 2:1), the glass transition temperature range of monomers (15-90°C), and the thickness of the adhesive layer (50-200 μm). These parameter optimizations ensure the adhesive maintains appropriate flexibility, adhesion, and thermal stability to prevent both bubble formation and yellowing

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If existing optical transparent adhesive layers are designed to have yellowing resistance, then they can maintain transparency, but they cannot resist bubbles well

Engineering Contradiction:

Improveyellowing resistanceVSAvoidbubble resistance

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent employs a composite adhesive system comprising multiple monomers (acrylate monomer, hydroxyl-containing monomer, and high Tg monomer) with specific weight ratios. This composite formulation integrates the benefits of each component: acrylate provides adhesion, hydroxyl groups enhance polarity and bonding, and high Tg monomers maintain structural stability at elevated temperatures, collectively achieving both bubble resistance and yellowing resistance

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent optimizes specific parameters including the weight ratio of acrylate monomer to hydroxyl-containing monomer (1:1 to 2:1), the glass transition temperature range of monomers (15-90°C), and the thickness of the adhesive layer (50-200 μm). These parameter optimizations ensure the adhesive maintains appropriate flexibility, adhesion, and thermal stability to prevent both bubble formation and yellowing

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the adhesive layer thickness is increased, then bubble resistance may improve, but yellowing resistance deteriorates

Engineering Contradiction:

Improvebubble resistanceVSAvoidyellowing

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent optimizes the adhesive layer thickness to a specific range of 50-200 μm. This parameter optimization balances the competing requirements: sufficient thickness to provide adequate bubble resistance while maintaining thinness to prevent yellowing. The optimized thickness ensures both functions are achieved simultaneously

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs a composite adhesive system comprising multiple monomers (acrylate monomer, hydroxyl-containing monomer, and high Tg monomer) with specific weight ratios. This composite formulation integrates the benefits of each component: acrylate provides adhesion, hydroxyl groups enhance polarity and bonding, and high Tg monomers maintain structural stability at elevated temperatures, collectively achieving both bubble resistance and yellowing resistance

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 adhesive layer demonstrates superior bubble resistance and yellowing resistance, maintaining optical properties and durability even at varying thicknesses, thus meeting the requirements for higher quality optical transparent adhesive layers.

Implementation Method 1

a first initiator0.001-0.2parts by weight... initiating the composition using UV light to pre-polymerize the composition into a first adhesive slurry

Methodology Applied

Scientific EffectPhotopolymerization: Photopolymerisation

Data Source

PatentUS20250075112A1Optical transparent adhesive layer with both bubble resistance and yellowing resistance and its application

Publication Date: 2025.03.06 TESA SE

AI summary

An optical transparent adhesive layer with both bubble resistance and yellowing resistance and its application. Specifically, the present discloses a composition, an adhesive layer obtained by further polymerizing the composition has both excellent bubble resistance and excellent yellowing resistance, which can fully satisfy the comprehensive requirements of the market for optical transparent adhesive layers.