Optical Display Adhesive Composition for Inkjet Printing and Flexibility
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Solution Overview
Problem
Existing adhesive compositions used in optical display devices are unsuitable for inkjet printing, require additional processes like punching, and lack flexibility and flexural resistance, especially at low temperatures.
Innovation Solution
An adhesive composition comprising a (meth)acrylic prepolymer with hydroxyl and alkyl groups, along with specific (meth)acrylates, achieving a shear viscosity of 0.04 Pa·s or less and a modulus of 0.3 MPa or less at −20° C., suitable for inkjet printing and providing good flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a typical OCR composition with oligomer and plasticizer is used, then the adhesive composition can be applied by dispensing process, but the process takes more time and the composition is unlikely to realize low temperature modulus for flexibility
Solution Approach 1:
The patent changes the molecular weight parameters of the oligomer (reducing to 10,000-100,000) and plasticizer (reducing to 500-5,000), which fundamentally alters the viscosity characteristics of the adhesive composition, enabling it to be applied by inkjet printing rather than dispensing, thus reducing application time
2Ease of manufacture
If the molecular weight of oligomer or plasticizer is reduced to achieve low viscosity for inkjet printing, then the application process is improved, but the flexural resistance is not improved
Solution Approach 1:
The patent creates a composite adhesive system combining specifically formulated oligomer (10,000-100,000 molecular weight) with plasticizer (500-5,000 molecular weight) in a weight ratio of 9:1 to 1:9, where the synergistic interaction between these two components achieves both low viscosity for inkjet printing and sufficient flexural resistance
3Ease of manufacture
If adhesive composition is applied by dispensing process, then the composition can be applied, but the process takes more time than inkjet printing
Solution Approach 1:
The patent modifies the viscosity parameters of the adhesive composition by controlling molecular weights of components, enabling the material to be suitable for inkjet printing process which operates at higher speeds compared to dispensing, thus improving application speed and productivity
4Ease of operation
If adhesive composition uses reduced molecular weight components, then the viscosity is reduced for better application, but the flexural resistance is not improved
Solution Approach 1:
The patent formulates a composite adhesive composition using oligomer and plasticizer in specific molecular weight ranges and weight ratios, where the combination of these two materials with different molecular weights provides both the desired low viscosity for easy application and sufficient flexural resistance that neither component could achieve alone
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 enables efficient application and formation of a flexible adhesive layer with high peel strength, preventing delamination and deformation in foldable displays.
Implementation Method 1
there is proposed a process of directly spraying an adhesive composition onto an element by inkjet printing
Implementation Method 2
followed by curing the adhesive composition
Data Source
AI summary
Provided are: an adhesive composition comprising (i) (meth)acrylic prepolymer having a hydroxyl group and an alkyl group, and (ii) at least one of an aromatic group-containing (meth)acrylate, an alicyclic group-containing (meth)acrylate, and a heteroalicyclic group-containing (meth)acrylate, and having a shear viscosity of about 0.04 Pa·s or less at 40° C., wherein an adhesive layer formed of the adhesive composition has a modulus of about 0.3 MPa or less at −20° C. and a peel strength of about 400 gf/in or more; an adhesive layer formed therefrom; and an optical display device comprising same.