UV-Blocking Adhesive Composition With Visible-Light Curing

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Solution Overview

Problem

Conventional adhesives for foldable smartphones face challenges in maintaining ultraviolet blocking properties and optical transparency when incorporating ultraviolet absorbers, as they hinder photocuring and reduce visible light transparency.

Innovation Solution

An ultraviolet blocking adhesive composition using a photoinitiating system activated by visible light, comprising a polymerizable monomer, a photocatalyst with thermally activated delayed fluorescence, and a co-initiator, which initiates curing reactions in the 300 to 800 nm wavelength range, allowing for high resin conversion rates and transparency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If an ultraviolet absorber is added to the adhesive composition, then ultraviolet blocking properties are improved, but resin conversion rate and optical transparency deteriorate

Engineering Contradiction:

Improveultraviolet blocking propertiesVSAvoidresin conversion rate

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent changes the curing wavelength parameter from ultraviolet range to visible light range (400-800 nm). By selecting a photoinitiator system that activates in the visible light region, the invention enables simultaneous achievement of high resin conversion rate and ultraviolet blocking properties, as the ultraviolet absorber no longer interferes with the curing process.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces a visible light photoinitiator as an intermediary that mediates between the ultraviolet absorber and the curing process. This photoinitiator absorbs visible light and generates radicals to initiate polymerization, while the ultraviolet absorber remains effective at blocking ultraviolet light without interfering with visible light curing.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If an ultraviolet absorber is added to the adhesive composition, then ultraviolet blocking properties are improved, but optical transparency in visible light region deteriorates

Engineering Contradiction:

Improveultraviolet blocking propertiesVSAvoidoptical transparency

Core Design Contradiction:

Object-affected harmful factorsVSIllumination intensity

Solution Approach 1:

The patent changes the operating wavelength parameter from ultraviolet to visible light range. By using a photoinitiator activated by visible light (400-800 nm), the invention allows the adhesive to be cured in the visible region where optical transparency is maintained, while the ultraviolet absorber provides protection in the ultraviolet region without affecting visible light transmission.

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If a photosensitizer is used to cure the adhesive by visible light, then ultraviolet blocking properties are maintained, but optical transparency of the film in visible light region is significantly reduced

Engineering Contradiction:

Improveultraviolet blocking propertiesVSAvoidoptical transparency

Core Design Contradiction:

Object-affected harmful factorsVSIllumination intensity

Solution Approach 1:

The patent optimizes the photoinitiator selection parameter by choosing a visible light photoinitiator with appropriate absorption characteristics (400-800 nm). This enables curing in the visible region while maintaining high optical transparency, as the photoinitiator absorbs only specific wavelengths and the cured film remains transparent across the visible spectrum.

Inventive Principle:

Principle #35Parameter changes

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 effective ultraviolet blocking and high resin conversion rates while maintaining optical clarity, suitable for use in foldable smartphone displays.

Implementation Method 1

a photoinitiating system that absorbs light in the wavelength range of 300 to 800 nm to initiate a curing reaction

Methodology Applied

Scientific EffectPhotopolymerization: Photopolymerisation

Implementation Method 2

an ultraviolet absorber

Methodology Applied

Scientific EffectAbsorption (EM radiation): Absorption (EM radiation)

Implementation Method 3

a photocatalyst with thermally activated delayed fluorescence

Methodology Applied

Scientific EffectThermally activated delayed fluorescence: Fluorescence

Data Source

PatentUS20260071098A1Ultraviolet-blocking adhesive composition, method for preparing adhesive resin by using same, and adhesive film manufactured using same

Publication Date: 2026.03.12 VISCURE INC

AI summary

The present invention relates to an ultraviolet blocking adhesive composition, a method for preparing an adhesive resin using the same, and an adhesive film prepared therefrom. According to the present invention, by applying a photoinitiating system activated by visible light to the adhesive composition, an adhesive resin with an excellent polymerization rate of monomers can be prepared even when an ultraviolet absorber is added. The adhesive composition of the present invention comprises an ultraviolet absorber, exhibits a high resin conversion rate, and is capable of curing within a matrix through visible-light-induced polymerization even when UV transmission is not possible. Furthermore, since the resin has excellent transparency, it can be effectively used as an optically clear adhesive for blocking ultraviolet rays.