Photocurable Resin Composition for Transparent Displays

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Solution Overview

Problem

Quantum dot films are vulnerable to moisture and oxygen, leading to instability and reliability issues, with existing solutions like thiol-ene compositions experiencing storage stability problems and limited effectiveness at high temperatures.

Innovation Solution

A photocurable resin composition comprising an organophosphate-based (meth)acrylate and a phenolic compound or phosphate compound with phenolic —OH, combined with a thiol compound and photoinitiator, which enhances storage stability and adhesion, while maintaining luminance and transparency even at high temperatures and high humidity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If thiol-ene composition is used to improve adhesion and moisture resistance, then adhesion to barrier layer is improved, but storage stability deteriorates due to spontaneous dark reaction and gelation

Engineering Contradiction:

Improveadhesion to barrier layerVSAvoidstorage stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

A chelating agent is introduced as an intermediary substance that forms stable complexes with metal ions, thereby preventing the spontaneous dark reaction between thiol and alkene groups. This mediator allows the composition to maintain both good adhesion properties and improved storage stability by controlling the reaction pathway.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The composition adjusts key parameters including the ratio of thiol to alkene groups, the concentration of chelating agent, and the molecular weight of polymer components to optimize both storage stability and adhesion performance. By carefully controlling these parameters, the system prevents premature gelation while maintaining bonding capability.

Inventive Principle:

Principle #35Parameter changes

2Stability of the object's composition

If existing radical polymerization inhibitors are used to improve storage stability, then storage stability is improved, but effectiveness at high temperatures deteriorates

Engineering Contradiction:

Improvestorage stabilityVSAvoideffectiveness at high temperature

Core Design Contradiction:

Stability of the object's compositionVSTemperature

Solution Approach 1:

The invention uses a composite approach by combining organic peroxide initiators with specific chelating agents that work synergistically. The chelating agent stabilizes the composition at room temperature by preventing dark reactions, while the peroxide initiator ensures reliable curing at elevated temperatures, creating a system that maintains effectiveness across a wide temperature range.

Inventive Principle:

Principle #40Composite materials

3Object-affected harmful factors

If quantum dot film is coated with metal oxide barrier layer to prevent moisture penetration, then moisture resistance is improved, but adhesion problems occur without hydrogen bonding functional groups

Engineering Contradiction:

Improvemoisture penetration resistanceVSAvoidadhesion to barrier layer

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The thiol-ene composition serves multiple functions simultaneously: it provides adhesion to metal oxide barrier layers through thiol-metal oxide bonding, maintains moisture resistance by forming a crosslinked network, and achieves cure at room temperature or mild conditions. This multi-functional system eliminates the need to choose between adhesion and moisture protection.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 exhibits stable properties across various temperatures, ensuring a long pot life and excellent adhesion, luminance, and resistance to color change, making it suitable for transparent display applications.

Implementation Method 1

the photoinitiator initiates a radical reaction by ultraviolet rays, the alkene resin is polymerized

Methodology Applied

Scientific EffectPhotopolymerization: Photopolymerisation

Implementation Method 2

thiols and radicals generated in the alkene resin are cured by another curing mechanism through the chain transfer reaction and the Michael reaction of the thiol and the olefin

Methodology Applied

Scientific EffectChain transfer reaction:

Implementation Method 3

the chain transfer reaction and the Michael reaction of the thiol and the olefin

Methodology Applied

Scientific EffectMichael reaction:

Implementation Method 4

securing adhesion between barrier layers by bonding thiols with metal oxides

Methodology Applied

Scientific EffectHydrogen bonding:

Implementation Method 5

thiol has a hydrogen bonding property, but has a hydrophobic property, thereby having the advantage of preventing the penetration of moisture and oxygen

Methodology Applied

Scientific EffectHydrophobic property: Hydrophobe

Data Source

PatentUS11708498B2Photocurable resin composition, method for preparing the same, and optical film comprising the same

Publication Date: 2023.07.25 SHIN A T&C CO LTD

AI summary

The present invention relates to a photocurable resin composition, a method for preparing the same, and an optical film comprising the same, more specifically, the photocurable resin composition comprises organophosphate-based (meth)acrylate; and a phenolic compound or a phosphate compound containing phenolic —OH. Thus, since the photocurable resin composition can ensure storage stability, it is suitable as a material for a transparent display.