Inorganic-Coated Carbon Black Particles for Optical Density and Insulation
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Solution Overview
Problem
Existing carbon black pigments face challenges in achieving high optical density, thermal durability, low electric conductivity, good processability, low UV absorption, and a desirable bluish undertone, especially under high loading levels, which are essential for applications like black matrices in high light-shielding devices.
Innovation Solution
The development of composite particles comprising a carbon black core coated with nano-sized inorganic compounds, such as barium sulfate, which improves color, bluish undertone, and thermal durability while reducing electric conductivity, even at high loading levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If carbon black is used at high loading levels to achieve high optical density, then optical density is improved, but electrical conductivity increases making it unsuitable for insulation applications
Solution Approach 1:
The patent applies composite materials by combining carbon black particles with inorganic compounds (such as metal oxides, silicates, or sulfates) to form a composite pigment. This composite structure allows the carbon black to provide high optical density while the inorganic compound coating layer provides electrical insulation, thus resolving the contradiction between achieving high optical density and maintaining electrical insulation at high loading levels.
Solution Approach 2:
The patent applies local quality by creating a core-shell structure where the carbon black core provides optical density and the inorganic compound shell provides electrical insulation. This localized functional distribution allows different regions of the particle to perform different functions, enabling high optical density while maintaining electrical insulation properties.
2Illumination intensity
If carbon black is used to achieve high blackness, then optical density is improved, but dispersibility of fine particles deteriorates
Solution Approach 1:
The inorganic compound coating on carbon black particles creates a composite structure that improves dispersibility. The inorganic compound layer prevents particle aggregation and enhances compatibility with the polymer matrix, allowing fine carbon black particles to be well-dispersed while maintaining high blackness.
Solution Approach 2:
The patent applies parameter changes by modifying the surface properties of carbon black particles through coating with inorganic compounds. This changes the surface chemistry and physical properties, improving particle dispersibility in polymer matrices while preserving the optical properties of the carbon black core.
3Object-generated harmful factors
If organic groups are attached to carbon black surface to improve electrical insulation, then electrical insulation is improved, but thermal durability deteriorates after high temperature baking
Solution Approach 1:
The patent replaces organic surface groups (which are thermally unstable) with inorganic compound coatings. The inorganic compounds provide thermal stability and maintain electrical insulation properties after high temperature baking, effectively replacing the thermally labile organic modification approach.
Solution Approach 2:
The composite structure of carbon black core with inorganic compound coating provides both electrical insulation and thermal durability. The inorganic compound layer is thermally stable and maintains its insulating properties after high temperature processing, unlike organic groups that decompose or detach.
4Ease of operation
If carbon black particles are made very fine to improve dispersion, then dispersibility is improved, but UV absorption increases for photolithography applications
Solution Approach 1:
The inorganic compound coating layer acts as a local barrier that modifies the UV interaction properties of the particle surface. This localized modification reduces UV absorption at the particle surface while maintaining the fine particle size and dispersibility benefits, allowing the core to remain small for good dispersion while the shell controls UV interaction.
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 composite particles maintain high optical density and electrical insulation after high-temperature baking, providing a bluish undertone and improved processability, suitable for coatings, inks, and polymers.
Implementation Method 1
The composite particles maintain high optical density and electrical insulation after high-temperature baking
Implementation Method 2
reducing electric conductivity, even at high loading levels
Implementation Method 3
providing a bluish undertone
Implementation Method 4
improves color, bluish undertone, and thermal durability
Implementation Method 5
maintain high optical density and electrical insulation after high-temperature baking
Data Source
AI summary
Suggested is a composite particle comprising or consisting of a solid core partially or entirely coated with at least one inorganic compound, wherein (a) said solid core is a carbon black particle carrying functional groups on its surface, and (b) said at least one inorganic compound shows a particle size of from about 5 to about 100 nm, wherein said solid core particles show a diameter of primary particle size from about 5 to about 500 nm.