Inkjet Resin Composition for Foldable Display Impact Resistance
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Solution Overview
Problem
Foldable display devices require adhesive resins with improved impact resistance to ensure reliability during folding or bending operations, as existing inkjet resin compositions often exhibit brittle properties leading to cracking under external impact.
Innovation Solution
An inkjet resin composition is developed, comprising 16% to 24% by weight of a urethane oligomer with a semi-crystalline polymer content of 5% to 50% by weight, along with 56% to 84% by weight of monomer, 4% to 6% by weight of crosslinking agent, 4% to 6% by weight of additive, and 1% to 3% by weight of photo-initiator, which forms a partially segmented cross-linked structure to enhance impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional inkjet resin composition is used, then the adhesive layer can be formed, but the impact resistance is poor and cracking occurs under external impact
Solution Approach 1:
The patent uses a composite resin composition containing multiple types of oligomers (epoxy oligomer, polyester oligomer, polyurethane oligomer) and multiple monomers with different functional groups. This multi-component composite system provides both strength and flexibility, preventing cracking while maintaining adhesion between the display panel and cover window.
Solution Approach 2:
The patent optimizes the molecular weight parameters of the oligomers (epoxy oligomer: 1000-5000, polyester oligomer: 1000-3000, polyurethane oligomer: 2000-6000) and the ratios of different components to achieve the desired balance between adhesion strength and impact resistance. The viscosity is controlled within 20-50 cp through these parameter adjustments.
2Reliability
If the resin composition is optimized for impact resistance, then cracking resistance improves, but the viscosity may increase affecting inkjet ejection
Solution Approach 1:
The patent carefully controls the molecular weight parameters of all oligomer components within specific ranges (epoxy: 1000-5000, polyester: 1000-3000, polyurethane: 2000-6000) and adjusts their weight ratios to maintain viscosity between 20-50 cp. This ensures both improved cracking resistance and ease of inkjet ejection.
Solution Approach 2:
The combination of different oligomer types with complementary properties creates a composite system that achieves optimal viscosity for inkjet processing while providing the flexibility and strength needed to prevent cracking. The synergistic effect of multiple components allows simultaneous optimization of both 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 inkjet resin composition demonstrates improved impact resistance, reducing the likelihood of cracking and peeling from the display panel, while maintaining a low viscosity suitable for easy ejection from an inkjet device.
Implementation Method 1
a cured inkjet resin composition which is a cured layer of inkjet resin composition, wherein the inkjet resin composition includes 16% to 24% by weight of a urethane oligomer, 56% to 84% by weight of a monomer, 4% to 6% by weight of a crosslinking agent, 4% to 6% by weight of an additive, and 1% to 3% by weight of a photo-initiator
Data Source
AI summary
An inkjet resin composition according to an embodiment includes 16% to 24% by weight of a urethane oligomer, 56% to 84% by weight of a monomer, 4% to 6% by weight of a crosslinking agent, 4% to 6% by weight of an additive, and 1% to 3% by weight of a photo-initiator, and the content of the semi-crystalline polymer in the urethane oligomer is 5% to 50% by weight.