Photocurable Composition UV Absorber Transparency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing photocurable compositions with ultraviolet absorbers face challenges in forming colorless and transparent cured materials, as they often result in low photocurability and are unsuitable for applications like organic EL elements due to yellowing and reduced transparency.
Innovation Solution
A photocurable composition comprising a (meth)acrylate compound, film forming resin, photoinitiator, and specific ultraviolet absorbers, which maintains high photocurability and produces a cured material with low yellow index and high transparency, suitable for display devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a resin layer containing an ultraviolet absorber is formed using a photocurable resin with high adhesive force, then adhesive strength is improved, but the cured material becomes colored and transparency deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the photocurable resin system by selecting specific photoinitiators (Type I and Type II) and adjusting their concentrations, along with choosing appropriate (meth)acrylate compounds and film forming resins. These parameter changes enable the resin to cure with minimal yellowing while maintaining high adhesive force, thus improving transparency without sacrificing bonding strength.
Solution Approach 2:
The patent creates a composite photocurable composition by combining multiple components: (meth)acrylate compounds, film forming resins, photoinitiators (Type I and Type II), and ultraviolet absorbers. This composite formulation synergistically achieves both high adhesive strength and excellent transparency after curing, resolving the contradiction between bonding performance and optical clarity.
2Object-affected harmful factors
If an ultraviolet absorber is added to a photocurable composition, then ultraviolet ray blocking capability is improved, but photocurability deteriorates
Solution Approach 1:
The patent introduces Type II photoinitiators as intermediaries that work synergistically with Type I photoinitiators and ultraviolet absorbers. The Type II photoinitiator mediates between the ultraviolet absorber (which blocks UV) and the curing process, enabling effective UV protection while maintaining high photocurability through cooperative action among all components.
Solution Approach 2:
The patent optimizes the concentration parameters of photoinitiators and ultraviolet absorbers within specific ranges. By carefully controlling these parameters, the composition achieves sufficient ultraviolet blocking capability while maintaining high photocurability, preventing the deterioration that would occur with excessive absorber content.
3Object-affected harmful factors
If a resin layer is formed to block ultraviolet rays, then protection against ultraviolet deterioration is improved, but the cured material exhibits yellowing and reduced transparency
Solution Approach 1:
The patent changes the chemical composition parameters by selecting specific film forming resins with low yellowing tendency and adjusting the concentration of ultraviolet absorbers to optimal levels. These parameter changes enable the resin layer to provide effective UV protection while maintaining excellent transparency and minimizing yellowing after curing.
Solution Approach 2:
The patent develops a composite resin system that integrates film forming resins, photoinitiators, and ultraviolet absorbers in specific proportions. This composite formulation achieves synergistic effects where the UV protection function does not compromise transparency, as each component is selected and balanced to maintain optical clarity while providing robust ultraviolet blocking.
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 achieves a yellow index of 4.0 or less and light transmittance of 5.0% or less at 385 nm, ensuring effective ultraviolet ray blocking and maintaining transparency, making it suitable for organic EL elements and display devices.
Implementation Method 1
a photocurable composition including a (meth)acrylate compound... and a photoinitiator
Implementation Method 2
the present invention relates to a photocurable composition including an ultraviolet absorber, which can form a cured material that hardly transmits ultraviolet rays from the outside
Data Source
AI summary
The present invention provides a photocurable composition containing an ultraviolet absorber, which has high photocurability and yields a cured material having a high cutting capacity against ultraviolet rays from the outside, a low yellow index, and colorlessness and transparency. The present invention relates to a sheet-shaped photocurable composition which includes the following components (A) to (D), and when a cured material obtained after photocuring the photocurable composition has a thickness of 150 μm, a yellow index of the cured material is 4.0 or less and a light transmittance of the cured material at a wavelength of 385 nm is 5.0% or less: a component (A): a (meth)acrylate compound, a component (B): a film forming resin, a component (C): a photoinitiator, and a component (D): an ultraviolet absorber.