Near-Infrared Cut Filter Composition for Light and Moisture Stability
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Solution Overview
Problem
The existing curable compositions used for near infrared cut filters have insufficient light fastness and moisture resistance, which affects the performance of solid-state imaging elements and image display devices.
Innovation Solution
A curable composition incorporating a near infrared absorbing colorant with specific groups, such as those represented by Formulas (1) and (10), which provide enhanced steric hindrance and improved spectral characteristics for better light blocking and moisture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a curable composition including a conventional squarylium compound is used for a near infrared cut filter, then the filter can block near infrared light, but the film has insufficient light fastness and moisture resistance
Solution Approach 1:
The patent modifies the molecular structure of the squarylium compound by introducing specific substituents (Formula 1 with G2 having -Es' value of 2.4 or higher) to change its chemical parameters. This structural modification increases steric hindrance around the carbonyl group, which prevents photodissociation and hydrolysis reactions, thereby significantly improving light fastness and moisture resistance while maintaining near infrared absorption properties
Solution Approach 2:
The patent creates a composite curable composition that combines the modified squarylium compound (with enhanced stability) with specific curable compounds. This composite system achieves both the near infrared blocking function and improved durability through the synergistic effect of the stabilized colorant and the curable matrix, resolving the contradiction between functionality and reliability
2Object-affected harmful factors
If a near infrared absorbing colorant is used to block infrared light, then infrared absorption is achieved, but the colorant undergoes photodissociation and hydrolysis under light and moisture exposure
Solution Approach 1:
The patent changes the chemical parameters of the squarylium compound by introducing bulky substituents (G2 with -Es' value ≥ 2.4) that create steric protection around the reactive carbonyl group. This structural parameter change allows the colorant to maintain its near infrared absorption capability while becoming resistant to photodissociation and hydrolysis, thus resolving the stability issue
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 excellent light fastness and moisture resistance, preventing photodissociation and hydrolysis, and maintaining visible transparency in the formed films.
Implementation Method 1
a near infrared absorbing colorant having a group represented by the following Formula (1)... a curable composition with which a film having excellent light fastness and moisture resistance can be formed
Implementation Method 2
a curable composition comprising: a near infrared absorbing colorant... and a curable compound
Data Source
AI summary
A curable composition includes: a near infrared absorbing colorant having a group represented by the following Formula (1); and a curable compound. In the formula, G1 represents NRG1 or an oxygen atom, and RG1 represents a hydrogen atom or a monovalent substituent. G2 represents a monovalent substituent having a -Es′ value of 2.4 or higher as a steric parameter.