Near Infrared Cut Filter Film Curable Composition
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Solution Overview
Problem
Near infrared cut filters with near infrared absorbing colorants face challenges with low light fastness and deterioration in visible transparency due to light irradiation, necessitating improvements in their performance.
Innovation Solution
A curable composition is developed comprising a near infrared absorbing colorant with a π-conjugated plane, a polymerizable monomer having an ethylenically unsaturated bond and groups like acid or hydroxyl groups, and a radical polymerization initiator, where the polymerizable monomer content exceeds 50% of the total monomers, ensuring high light fastness and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a near infrared absorbing colorant is used to manufacture a near infrared cut filter, then near infrared blocking properties are improved, but light fastness deteriorates and visible transparency deteriorates due to coloration caused by light irradiation
Solution Approach 1:
The patent changes the chemical composition parameters of the curable composition by specifying precise content ranges for polymerizable monomers (5-50 mass%), resins (70-95 mass%), and near infrared absorbing colorants (0.1-10 mass%). This parameter optimization resolves the contradiction by achieving both high near infrared blocking properties and excellent light fastness through balanced formulation
Solution Approach 2:
The patent creates a composite curable composition system combining polymerizable monomers, resins, and near infrared absorbing colorants. This composite approach allows the near infrared absorbing colorant to provide blocking properties while the polymerizable monomer and resin matrix provide stability and prevent light-induced coloration, thus resolving the contradiction between blocking performance and light fastness
2Reliability
If a near infrared absorbing colorant is used to manufacture a near infrared cut filter, then near infrared blocking properties are improved, but visible transparency deteriorates due to coloration caused by light irradiation
Solution Approach 1:
The patent optimizes the concentration parameter of near infrared absorbing colorant to 0.1-10 mass% in the curable composition. This precise parameter control ensures sufficient near infrared blocking while minimizing visible coloration, thus resolving the contradiction between blocking performance and visible transparency
Solution Approach 2:
The patent formulates a composite system where the near infrared absorbing colorant is dispersed in a polymerizable monomer and resin matrix. This composite structure allows the colorant to provide near infrared blocking functionality while the transparent polymer matrix minimizes visible coloration, resolving the contradiction between blocking properties and visible transparency
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 films with excellent visible transparency and near infrared blocking properties, maintaining light fastness and stability even under prolonged light exposure, while suppressing coloration and foreign matter generation.
Implementation Method 1
a radical polymerization initiator
Implementation Method 2
a near infrared absorbing colorant that includes a π-conjugated plane having a monocyclic or fused aromatic ring
Data Source
AI summary
A curable composition includes: a near infrared absorbing colorant; a polymerizable monomer that has a group including an ethylenically unsaturated bond; a resin; and a radical polymerization initiator, in which a content of the near infrared absorbing colorant is 10 mass % or higher with respect to a total solid content of the curable composition and a content of the polymerizable monomer that has at least one group selected from an acid group or a hydroxyl group and a group having an ethylenically unsaturated bond is higher than 50 mass % with respect to a total mass of all the polymerizable monomers. A near infrared cut filter, a solid image pickup element, an image display device, and an infrared sensor include a film which is formed using the curable composition.