Optical Filter Composition for Stable Light Absorber Dispersion
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Solution Overview
Problem
Existing optical filter compositions containing light absorbers, such as those described in Patent Literature 1, rely heavily on low-polarity organic solvents like toluene, which are environmentally harmful and can cause aggregation of the light absorber, leading to inefficiencies in spectral sensitivity and filter performance.
Innovation Solution
A liquid composition for optical filters is developed, incorporating a light absorber formed by a phosphonic acid with an aryl group bonded to a phosphorus atom and copper ion, along with alkoxysilane and its hydrolysate, and a phosphoric acid ester, using solvents with a relative permittivity of 7 or less, to minimize solvent content and prevent aggregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a low-polarity organic solvent such as toluene is used in the light-absorbing composition, then the light absorber is effectively dispersed without aggregation, but the environmental impact increases and the solvent content needs to be reduced
Solution Approach 1:
The patent introduces a dispersant as an intermediary substance between the light absorber and the solvent. This dispersant mediates the interaction, allowing effective dispersion of the light absorber while enabling the use of environmentally friendlier solvents or reducing the amount of low-polarity organic solvent required.
Solution Approach 2:
The patent modifies the chemical parameters of the composition by selecting specific dispersants with particular molecular structures and properties. By changing the dispersant parameters (molecular weight, polarity, functional groups), the system achieves effective dispersion with reduced reliance on problematic solvents.
2Object-affected harmful factors
If the content of low-polarity organic solvent is reduced, then the environmental impact decreases, but maintaining effective dispersion of the light absorber becomes difficult
Solution Approach 1:
The dispersant acts as a mediator that compensates for the reduced solvent effectiveness. Even with lower amounts of low-polarity organic solvent, the dispersant maintains stable dispersion of the light absorber by providing steric or electrostatic stabilization.
Solution Approach 2:
The patent creates a composite system combining the light absorber, dispersant, and solvent in specific ratios. This composite approach allows the system to function effectively with reduced solvent content while maintaining dispersion stability through the synergistic interaction of components.
3Reliability
If conventional light-absorbing compositions are used, then the optical filter blocks infrared and ultraviolet light, but the composition requires high content of low-polarity organic solvent which is environmentally undesirable
Solution Approach 1:
The dispersant intermediary enables the formulation to achieve both optical filtering performance and environmental compatibility. It allows the light-absorbing compounds to remain effectively dispersed at lower solvent concentrations, maintaining optical properties while reducing environmental harm.
Solution Approach 2:
By optimizing the parameters of the dispersant and the ratio of components, the patent achieves a formulation that maintains reliable optical filtering performance (blocking infrared and ultraviolet light) while significantly reducing the environmental impact associated with organic solvent content.
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 reduces the use of environmentally harmful solvents while maintaining or improving spectral sensitivity, blocking near-ultraviolet and near-infrared light, and ensuring consistent performance across various angles of light incidence.
Implementation Method 1
an optical filter blocking a portion of infrared light or ultraviolet light... optical filters including a light absorber-including film... transmittance properties of optical filters including a light absorber-including film
Implementation Method 2
at least one of an alkoxysilane and a hydrolysate of an alkoxysilane... capable of decreasing the content of a low-polarity organic solvent... prevent aggregation of the light absorber
Implementation Method 3
a phosphoric acid ester... maintaining the light absorber's dispersion
Data Source
AI summary
The liquid composition for optical filters according to the present invention contains: a light absorber; at least one of an alkoxysilane and a hydrolysate of an alkoxysilane; a phosphoric acid ester; and a solvent. The light absorber is formed by a phosphonic acid having an aryl group bonded to a phosphorus atom and copper ion. In the liquid composition, a content of an organic solvent having a relative permittivity of 7 or less at 20° C. is 50 mass % or less.