Methacrylic Adhesive Composition for Flat Panel Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing adhesives used in flat panel displays (FPDs) face challenges in workability and productivity, with limitations in adhesive strength, corrosion resistance, and durability, particularly in maintaining adhesion over time and under varying environmental conditions.
Innovation Solution
An adhesive composition comprising a (meth)acrylic copolymer with a weight average molecular weight of 100,000 to 2,000,000 g/mol, combined with a carbodiimide crosslinker, an organic group-containing compound including titanium, zirconium, or hafnium, and an imidazole compound, which facilitates cross-linking and improves pot life, allowing for enhanced adhesive properties and productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesives are used in flat panel displays, then basic adhesive function is provided, but adhesive strength, corrosion resistance, and durability are insufficient
Solution Approach 1:
The patent uses a composite adhesive system combining (meth)acrylic copolymer with carbodiimide crosslinker and organometallic catalyst. This composite approach enables simultaneous achievement of high adhesive strength through crosslinked network formation and good workability through controlled pot life extension, resolving the contradiction between reliability and ease of manufacture
Solution Approach 2:
The patent optimizes molecular weight parameters of the (meth)acrylic copolymer (100,000 to 2,000,000 g/mol) and controls the composition ratios of crosslinking agents to achieve the desired balance between adhesive performance and processing characteristics. By adjusting these parameters, the adhesive maintains workability while achieving superior durability
2Strength
If adhesive composition is optimized for strong adhesion, then bonding strength improves, but pot life decreases and workability worsens
Solution Approach 1:
The organometallic compound acts as an intermediary catalyst that enables controlled crosslinking. It mediates between the (meth)acrylic copolymer and carbodiimide crosslinker, allowing the adhesive to maintain adequate pot life for application while progressively developing strong adhesive bonds during the aging period
Solution Approach 2:
The adhesive composition is designed to undergo preliminary crosslinking reactions during the aging period before final application. This preliminary action allows the adhesive to develop initial bonding strength while maintaining workability, effectively extending the useful pot life without compromising final adhesive strength
3Productivity
If crosslinking speed is increased to improve productivity, then adhesive performance is achieved faster, but pot life is reduced and handling becomes difficult
Solution Approach 1:
The crosslinking process occurs in periodic stages: initial mixing and application phase with adequate pot life for handling, followed by progressive crosslinking during aging, and final curing. This periodic action allows the adhesive to be applied and handled easily while progressively achieving full crosslinked performance, thereby improving productivity without sacrificing ease of operation
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 achieves improved adhesive strength, corrosion resistance, and durability, with a long pot life that enables practical adhesive performance within a short aging time, enhancing workability and productivity while maintaining adhesion and resistance to light leakage, metal corrosion, and temperature variations.
Implementation Method 1
a carbodiimide crosslinker, and about 0.01 to about 0.3 parts by weight of an organic group-containing compound
Implementation Method 2
an imidazole compound, which facilitates cross-linking and improves pot life
Implementation Method 3
The adhesive layer may have an adhesive strength of about 0.5 to about 9 N/25 mm according to JIS Z0237
Data Source
AI summary
An adhesive composition, an adhesive layer, an optical member, and an adhesive sheet, the adhesive composition including 100 parts by weight of a (meth)acrylic copolymer, the (meth)acrylic copolymer having a weight average molecular weight of about 100,000 to about 2,000,000 g/mol; about 0.05 to about 5 parts by weight of a carbodiimide crosslinker; and about 0.01 to about 0.3 parts by weight of an organic group-containing compound, the organic group-containing compound including at least one selected from the group of titanium, zirconium, and hafnium.