Black Composite Oxide Composition for Stable Resistivity and Low Magnetization
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Solution Overview
Problem
Inorganic black pigments face challenges in achieving high blackness, low magnetization, and stable volume resistivity, particularly in toners, due to environmental variations in humidity and temperature.
Innovation Solution
A black composite oxide particle composed of specific ratios of Fe, Mg, and Al, with controlled crystallinity and Cl content, optimized for particle size and resistivity, ensuring balanced blackness and magnetization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If inorganic oxide pigment is used as an alternative to carbon black, then safety is improved, but blackness and cohesiveness deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating Fe, Mg, and Al in specific ratios (Fe: 30-55 mass%, Mg: 5-20 mass%, Al: 10-30 mass%) to achieve both safety and excellent blackness properties that carbon black cannot provide
Solution Approach 2:
The patent creates a composite oxide material combining Fe, Mg, and Al oxides with specific crystal structure characteristics (full width at half maximum of 0.120°-0.180°) to achieve superior blackness and cohesiveness compared to single-component oxides
2Reliability
If inorganic oxide pigment is used, then resistance is improved, but chargeability control under environmental variation deteriorates
Solution Approach 1:
The patent optimizes the Fe content parameter (30-55 mass%) to achieve a balance between resistance and chargeability stability, ensuring volume resistivity remains within 10^6-10^12 Ω·cm while maintaining stable chargeability across environmental conditions
Solution Approach 2:
The patent introduces Cl in specific amounts (10-100 ppm) as a local compositional modification to control surface properties and interfacial characteristics, thereby stabilizing chargeability under environmental variation while maintaining bulk resistance
3Illumination intensity
If Fe content is increased to improve blackness, then magnetization increases
Solution Approach 1:
The patent introduces Cl in specific amounts (10-100 ppm) as a local compositional modification to control surface properties and interfacial characteristics, thereby stabilizing chargeability under environmental variation while maintaining bulk resistance
Solution Approach 2:
The patent optimizes the Fe content parameter (30-55 mass%) to achieve a balance between resistance and chargeability stability, ensuring volume resistivity remains within 10^6-10^12 Ω·cm while maintaining stable chargeability across environmental conditions
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 solution provides a black composite oxide particle with high safety, excellent blackness, low magnetization, and minimal environmental variation in volume resistivity, suitable for applications in paints, printing inks, toners, rubber/plastics, and ceramics.
Implementation Method 1
Black pigments used in applications such as paints, printing inks, toners, rubber/plastics, and ceramics are required to have properties such as blackness, coloring power, and hiding power
Implementation Method 2
a full width at half maximum of a diffraction peak based on a (311) plane representing a spinel structure in X-ray crystal structure analysis is 0.100° or more and 0.190° or less
Data Source
AI summary
An object of the present invention is to provide a black composite oxide particle having high safety, excellent blackness, low magnetization, and a small environmental variation in volume resistivity. A black composite oxide particle according to the present invention contains: Fe, Mg, and Al as metal components, in which when a content of Fe is W1 wt%, a content of Mg is W2 wt%, and a content of Al is W3 wt%, 42 ≤ W1 ≤ 60, 4 ≤ W2 ≤ 11, and 4 ≤ W3 ≤ 11 are satisfied, a full width at half maximum of a diffraction peak based on a (311) plane representing a spinel structure in X-ray crystal structure analysis is 0.100° or more and 0.190° or less, and Cl is further contained in an amount of 5 ppm or more and 100 ppm or less.