Acicular Titanium Oxide Toner Masking Chargeability
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Solution Overview
Problem
Conventional white electrostatic charge image developing toners with high titanium oxide content suffer from insufficient masking effects when overlaid on color grounds due to reduced electric chargeability, limiting the loadable amount of spherical titanium oxide.
Innovation Solution
Incorporating acicular titanium oxide particles with an average aspect ratio between 3 to 30, which enhances masking effects by reducing gaps between toner particles and improving covering rate, thereby achieving higher masking performance compared to spherical titanium oxide at equal amounts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If spherical titanium oxide is added in high content to improve masking effects, then masking performance is improved, but electric chargeability deteriorates
Solution Approach 1:
The invention changes the shape parameter of titanium oxide from spherical to acicular (needle-like), which fundamentally alters how the pigment particles pack and interact with light and electric fields. This shape transformation allows achieving high masking effects with lower titanium oxide content, thereby preserving electric chargeability while improving masking performance.
Solution Approach 2:
The invention creates a composite toner system combining acicular titanium oxide particles with specific binder resins and charge control agents. This composite approach optimizes the interaction between pigment and binding materials, enabling high titanium oxide dispersion and effective charge control even at elevated pigment concentrations, thus resolving the contradiction between masking and chargeability.
2Quantity of substance
If spherical titanium oxide is used to achieve high masking effects, then masking performance is improved, but the loadable amount is limited due to reduced electric chargeability
Solution Approach 1:
By transforming the shape parameter of titanium oxide from spherical to acicular form, the invention enables higher loadable amounts of titanium oxide in the toner composition. The needle-like structure provides better packing efficiency and light scattering properties, allowing increased pigment content without proportionally increasing the negative impact on electric chargeability.
Data Source
AI summary
An electrostatic charge image developing toner includes a white pigment being acicular titanium oxide having an average aspect ratio within a range of 3 to 30.