UV-Shielding Photopolymer Composition With Reliable Curing

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Solution Overview

Problem

Existing photopolymerizable compositions containing ultraviolet absorbing agents suffer from poor light resistance and solvent resistance, leading to degradation of ultraviolet absorption performance and insufficient curing due to the absorption of exposure light by the agent, which hinders the generation of active species from the photopolymerization initiator.

Innovation Solution

A photopolymerizable composition comprising specific compounds represented by Formulas (1) and (2), a polymerizable compound, and a photopolymerization initiator, such as acetophenone, acylphosphine, or benzophenone compounds, which enhances light resistance and solvent resistance by promoting active species generation and improving curing efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If an ultraviolet absorbing agent is used to shield against ultraviolet rays, then ultraviolet protection performance is improved, but light resistance deteriorates causing degradation of ultraviolet absorption performance over time

Engineering Contradiction:

Improveultraviolet protection performanceVSAvoidlight resistance

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent changes the chemical structure parameters of the ultraviolet absorbing agent by introducing specific substituents (alkyl groups, alkoxy groups, aryl groups, etc.) at defined positions (R1-R6) to improve light resistance while maintaining ultraviolet absorption capability. This structural modification allows the agent to resist degradation from light exposure.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite photopolymerizable composition containing the modified ultraviolet absorbing agent combined with specific polymerizable compounds and photopolymerization initiators. This composite system synergistically improves both ultraviolet protection and light resistance compared to using the absorbing agent alone.

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If an ultraviolet absorbing agent is used to shield against ultraviolet rays, then ultraviolet protection performance is improved, but solvent resistance deteriorates leading to insufficient curing

Engineering Contradiction:

Improveultraviolet protection performanceVSAvoidsolvent resistance

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent modifies the chemical structure of the ultraviolet absorbing agent by introducing specific substituents (alkyl groups, alkoxy groups, aryl groups, etc.) at defined positions (R1-R6) to improve light resistance while maintaining ultraviolet absorption capability. This structural modification allows the agent to resist degradation from light exposure.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

Inventive Principle:

Principle #40Composite materials

3Object-affected harmful factors

If exposure light is absorbed by the ultraviolet absorbing agent, then ultraviolet protection is improved, but active species generation from photopolymerization initiator deteriorates

Engineering Contradiction:

Improveultraviolet protectionVSAvoidactive species generation efficiency

Core Design Contradiction:

Object-affected harmful factorsVSUse of energy by moving object

Solution Approach 1:

The patent optimizes the absorption spectrum parameters of the ultraviolet absorbing agent through structural modification, creating a profile that strongly absorbs harmful ultraviolet rays while being more transparent to the exposure light wavelengths needed for photopolymerization initiator activation.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies different substituent types (alkyl, alkoxy, aryl groups) at specific positions (R1-R6) of the ultraviolet absorbing agent molecule to create localized electronic properties that selectively enhance ultraviolet absorption at certain wavelengths while maintaining transmission at exposure light wavelengths.

Inventive Principle:

Principle #3Local quality

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 forms a cured substance with excellent light resistance and solvent resistance, effectively shielding against ultraviolet rays and ensuring complete curing by promoting active species generation from the photopolymerization initiator.

Implementation Method 1

irradiated with light, since the exposure light is absorbed by the ultraviolet absorbing agent, active species such as radicals are unlikely to be generated from a photopolymerization initiator

Methodology Applied

Scientific EffectPhotolysis: Photodissociation

Implementation Method 2

an ultraviolet absorbing agent is used for such ultraviolet cut filters

Methodology Applied

Scientific EffectPhotoabsorption: Absorption (EM radiation)

Implementation Method 3

the photopolymerizable composition is cured by being irradiated with light

Methodology Applied

Scientific EffectPhotopolymerization: Photopolymerisation

Data Source

PatentUS12565600B2Photopolymerizable composition, cured substance, and optical member

Publication Date: 2026.03.03 FUJIFILM CORP

AI summary

Provided are a photopolymerizable composition including at least one compound selected from a compound represented by Formula (1) or a compound represented by Formula (2), a polymerizable compound, and a photopolymerization initiator, and a cured substance and an optical member which are formed of the photopolymerizable composition.