Photocurable Resin Composition for UV Blocking Without Yellowing
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Solution Overview
Problem
Conventional photocurable compositions containing ultraviolet absorbers face challenges in forming colorless and transparent cured resins due to the absorber's coloring effects, which complicates their use in display apparatus where transparency is crucial.
Innovation Solution
A photocurable composition incorporating a specific ultraviolet absorber compound, (n is an integer of 1 to 4, R is a hydrocarbon group with 6 or more carbon atoms) along with (meth)acrylate compounds, film-forming resins, and photoinitiators, ensuring light transmittance of 50% or less and a yellowness index of 3.0 or less, thereby maintaining transparency and adhesive strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an ultraviolet absorber is added to a photocurable composition, then ultraviolet protection is improved, but the cured resin becomes colored and transparency is degraded
Solution Approach 1:
The patent applies parameter changes by carefully controlling the concentration of the ultraviolet absorber compound within the range of 0.01 to 5.0 wt% in the photocurable composition. This optimized concentration range ensures sufficient ultraviolet absorption while minimizing the coloring effect, allowing the cured resin to maintain both UV protection and transparency requirements for display apparatus applications.
Solution Approach 2:
The patent uses a composite material approach by combining the ultraviolet absorber compound with specific (meth)acrylate compounds and photoinitiators. This composite formulation ensures that the ultraviolet absorber provides protection while the other components maintain photocurability and minimize yellowing, achieving both UV blocking and transparency in the final cured resin.
2Object-affected harmful factors
If an ultraviolet absorber is added to a photocurable composition, then ultraviolet protection is improved, but photocurability is degraded
Solution Approach 1:
The patent optimizes the concentration parameter of the ultraviolet absorber to 0.01-5.0 wt%, which is sufficiently low to avoid interfering with the photopolymerization process while still providing effective ultraviolet protection. This parameter control prevents the absorber from absorbing the curing wavelengths needed for photocurability.
Solution Approach 2:
The patent introduces photoinitiators as intermediary substances that facilitate the photocuring process. These photoinitiators are specifically selected to work in conjunction with the ultraviolet absorber, ensuring that the curing reaction can proceed effectively even in the presence of the absorber compound, thus maintaining high photocurability.
3Object-affected harmful factors
If a resin layer containing an ultraviolet absorber is used to protect an organic layer, then ultraviolet protection is improved, but adhesive strength is reduced
Solution Approach 1:
The patent formulates a composite photocurable composition that includes (meth)acrylate compounds in addition to the ultraviolet absorber. These (meth)acrylate compounds provide excellent adhesive properties and bonding strength, compensating for any potential reduction in adhesion caused by the ultraviolet absorber, while still providing effective UV protection.
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 effectively prevents ultraviolet transmission while maintaining transparency and adhesive properties, making it suitable for use in display apparatus without the drawbacks of colored or degraded photocurability.
Implementation Method 1
a light transmittance of 385 nm is 50% or less... in a state in which a cured resin of the photocurable composition with a thickness of 200 μm or less is interposed between alkali free glass plates
Implementation Method 2
a photocurable composition including a compound of the following General Formula 1 as a component (A)... a (meth)acrylate compound as a component (B)... and a photoinitiator as a component (D)
Data Source
AI summary
Conventionally, a photocurable composition to which an ultraviolet absorber is added is difficult to form a colorless and transparent cured resin because the ultraviolet absorber itself is colored, and thus the photocurable composition is hardly to be used in a display apparatus required for colorlessness and transparency. Provided is a photocurable composition including a specific compound, wherein a light transmittance of 385 nm is 50% or less and a yellowness index is 3.0 or less in a state in which a cured resin having a thickness of 200 μm or less is interposed between alkali free glass plates each having a thickness of 0.7 mm.