Pressure-Sensitive Adhesive Composition Using Organic Silane Compound
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Solution Overview
Problem
Conventional pressure-sensitive adhesive compositions for liquid crystal display devices face issues with inadequate initial adhesive strength on substrates, excessive adhesive strength at high temperatures and humidity, and residual adhesive left behind after removal.
Innovation Solution
A pressure-sensitive adhesive composition incorporating a novel organic silane compound, specifically represented by formula 1, which is incorporated into an acrylic copolymer along with a multi-functional cross-linking agent, providing excellent initial adhesive strength and preventing excessive adhesive strength increase at high temperatures and humidity, allowing for clean removal without residue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional silane compound adhesive compositions are used, then adhesive strength is improved, but the adhesive leaves residue after removal and shows excessive strength increase under high temperature and humidity
Solution Approach 1:
The patent changes the chemical structure parameters of the silane compound by introducing a specific cyclic carbonate group structure with defined molecular weight range (100-500) and specific functional groups. This parameter change allows the adhesive to achieve strong initial bonding while preventing excessive strength increase under high temperature and humidity, and eliminates residue formation during removal.
Solution Approach 2:
The patent creates a composite adhesive system combining acrylic polymer base resin with specifically structured silane compounds containing cyclic carbonate groups. This composite material achieves synergistic effects where the silane compound provides controlled adhesion enhancement without the harmful effects of conventional silane adhesives, including residue formation and uncontrolled strength increase.
2Reliability
If adhesive strength is increased to improve initial attachment, then bonding reliability is improved, but clean removal becomes difficult and substrate damage may occur
Solution Approach 1:
The patent precisely controls the molecular weight parameter of the silane compound (100-500) and its structural parameters to achieve optimal adhesion strength that is sufficient for reliable initial attachment but not excessive for easy removal. This parameter optimization allows the adhesive to bond strongly during application while enabling clean removal without substrate damage.
3Duration of action of stationary object
If adhesive strength increases excessively under high temperature and humidity, then bonding durability is improved, but adhesive residue and substrate damage occur during removal
Solution Approach 1:
The patent modifies the thermal and humidity response parameters of the adhesive by incorporating silane compounds with specific cyclic carbonate structures. This changes the adhesive's behavior under high temperature and humidity conditions, allowing it to maintain controlled, stable bonding strength rather than excessive strength increase, thereby preventing residue formation and substrate damage during removal while ensuring long-term durability.
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 composition achieves superior initial adhesive strength on glass substrates and ensures clean removal by maintaining controlled adhesive strength, even under high temperature and humidity conditions, enhancing durability and adhesion properties.
Implementation Method 1
a pressure-sensitive adhesive composition characteristically containing the organic silane compound represented by formula (1)... comprising: a) 100 weight part of an acrylic copolymer... b) 0.01 ̃10 weight part of a multi-functional cross-linking agent; and c) 0.01 ̃5 weight part of the organic silane compound
Data Source
AI summary
The present invention relates to a pressure-sensitive adhesive composition, and more precisely, a pressure-sensitive adhesive composition containing an organic silane compound that exhibits excellent initial adhesive strength on a substrate, and does not leave any of the adhesive behind when removed because the adhesive power is not excessively increased even at high temperature or at high temperature and high humidity.