Light-Shielding Pigment Coating for Temporal Stability
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Solution Overview
Problem
There is a need for a light-shielding composition with excellent long-term temporal stability, particularly in applications where manufacturing conditions vary, and there is an increasing demand for products with stable quality over extended periods.
Innovation Solution
A light-shielding composition comprising a light-shielding pigment with an inorganic particle coated by an inorganic compound, containing nitrogen-containing metal compounds like zirconium nitride or zirconium oxynitride, and a polymerizable compound with an ethylenically unsaturated group, which provides superior dispersibility and stability when analyzed by X-ray photoelectron spectroscopy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a black pigment composition is used for light-shielding applications, then light-shielding properties are improved, but long-term temporal stability deteriorates when manufacturing conditions vary
Solution Approach 1:
The patent uses a composite material system consisting of nitrogen-containing metal compound particles (zirconium nitride, zirconium oxynitride, vanadium nitride, vanadium oxynitride, niobium nitride, or niobium oxynitride) coated with an inorganic compound layer. This composite structure provides both excellent light-shielding properties and improved long-term temporal stability, resolving the contradiction between light-shielding performance and reliability under varying manufacturing conditions.
Solution Approach 2:
The patent specifies precise compositional parameters for the nitrogen-containing metal compounds, including nitrogen content (10-60 wt%), oxygen content (0-20 wt%), and atomic ratios (N/M ratio of 0.5-2.0). By controlling these parameters within specific ranges, the invention achieves both superior light-shielding properties and enhanced long-term stability, even when manufacturing conditions vary.
2Object-affected harmful factors
If nitrogen-containing metal compounds are used as light-shielding pigment, then light-shielding performance is improved, but manufacturing complexity increases due to precise composition control requirements
Solution Approach 1:
The patent defines specific parameter ranges for the nitrogen-containing metal compounds (nitrogen content: 10-60 wt%, oxygen content: 0-20 wt%, N/M atomic ratio: 0.5-2.0) that balance light-shielding performance with manufacturability. These controlled parameters ensure consistent quality while maintaining excellent light-shielding properties, reducing the practical manufacturing complexity despite the precision requirements.
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 long-term temporal stability and improved performance in light-shielding applications, such as in solid-state imaging elements and image display devices, by maintaining the quality and effectiveness of the light-shielding properties over time.
Implementation Method 1
a contained atom number ratio of a total content of metallic atoms, which are selected from the group consisting of a zirconium atom, a vanadium atom, and a niobium atom, to a content of the silicon atom in a surface of the light-shielding pigment, as determined by X-ray photoelectron spectroscopy, is greater than 1.0
Data Source
AI summary
A light-shielding composition includes a light-shielding pigment, a resin, a polymerizable compound, which is a low-molecular-weight compound containing an ethylenically unsaturated group, and a polymerization initiator, in which the light-shielding pigment contains an inorganic particle, and an inorganic compound coating the inorganic particle, the inorganic particle contains one or more nitrogen-containing metal compounds selected from the group consisting of zirconium nitride, zirconium oxynitride, vanadium nitride, vanadium oxynitride, niobium nitride, and niobium oxynitride, the inorganic compound contains a silicon atom, and a contained atom number ratio of a total content of metallic atoms, which are selected from the group consisting of a zirconium atom, a vanadium atom, and a niobium atom, to a content of the silicon atom in a surface of the light-shielding pigment, as determined by X-ray photoelectron spectroscopy, is greater than 1.0.