Low Gloss SCD Toner via Silica Additive Package
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Solution Overview
Problem
Current toner formulations for high-speed printing lack sufficient minimum fusing temperature to prevent issues like cold offset and heavy paper handling, and exhibit high gloss that is not optimal for text applications, particularly in monochrome printing.
Innovation Solution
A toner composition comprising resin, optional wax, and a surface additive package including hexamethyldisilazane (HMDS) surface-treated silica, sol-gel silica, and polydimethylsiloxane (PDMS) surface-treated silica, which improves flow, charging, and reduces drum contamination while maintaining suitable gloss levels for matte finishes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If current toner formulations are used for high-speed printing, then printing speed is improved, but minimum fusing temperature is insufficient causing cold offset and poor fusing
Solution Approach 1:
The patent modifies the chemical composition parameters of the toner by incorporating specific waxes (polyethylene wax, polypropylene wax) and surface additives (silica, PDMS) to alter the melting and fusing characteristics. This enables the toner to achieve adequate fusing at lower temperatures while maintaining high-speed printing performance
Solution Approach 2:
The patent creates a composite toner formulation combining resin, multiple wax types, colorant, and surface additives. This composite structure allows the toner to exhibit both low-temperature fusing capability and high-speed printing suitability, resolving the contradiction between speed and temperature requirements
2Manufacturing precision
If current monochrome toner formulations are used, then print quality is achieved, but gloss level is too high for optimal text applications
Solution Approach 1:
The patent adjusts the surface properties of the toner by adding specific surface additives including silica and polydimethylsiloxane (PDMS). These additives modify the surface reflectivity and flow characteristics, reducing gloss to achieve a matte finish suitable for text printing while preserving image quality
Solution Approach 2:
The patent applies surface additives specifically to the toner particle surface to create a matte finish layer. This localized modification affects only the surface optical properties (reducing gloss) while maintaining the core toner's printing and fusing characteristics
3Speed
If toner composition is optimized for high-speed printing, then printing speed is improved, but toner usage increases and drum contamination occurs
Solution Approach 1:
The patent optimizes the particle size distribution and surface properties of the toner by incorporating silica and PDMS additives. These modifications improve toner flow characteristics and transfer efficiency, enabling high-speed printing with reduced toner consumption and minimized drum contamination
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 toner composition achieves high print quality with low minimum fix temperatures, reduced toner usage, and improved flow and charging characteristics, ensuring optimal performance in high-speed monochrome printing with suitable gloss levels for matte finishes.
Implementation Method 1
a surface additive at least partially coating toner particle surfaces. The surface additive comprises a mixture of a hexamethyldisilazane (HMDS) surface treated silica, a sol-gel silica that is not surface treated, and a polydimethylsiloxane (PDMS) surface treated silica
Implementation Method 2
heating the slurry to fowl aggregated particles in the slurry; freezing aggregation of the particles by adjusting the pH; heating the aggregated particles in the slurry to coalesce the particles into toner particles
Data Source
AI summary
A toner composition including toner particles that have a resin, an optional wax, and an optional colorant; and a surface additive at least partially coating toner particle surfaces. The surface additive includes a mixture of a hexamethyldisilazane (HMDS) surface treated silica, a sol-gel silica that is not surface treated, and a polydimethylsiloxane (PDMS) surface treated silica.