Core-Shell Toner Humidity Resistance via Functionalized Shell
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Solution Overview
Problem
Toner sensitivity to relative humidity leads to issues such as toner particle agglomeration and clogging of apparatus, which existing methods fail to adequately address while utilizing existing processing equipment and machinery.
Innovation Solution
A core-shell toner configuration is developed by blending a colorant and wax with a latex polymer core, followed by the addition of a functionalized latex shell, which reduces sensitivity to humidity through increased hydrophobicity, achieved by heating below and above the glass transition temperature of the latex.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional toner preparation methods are used, then toner particles can be produced, but the toner exhibits high sensitivity to relative humidity causing agglomeration and clogging
Solution Approach 1:
The patent modifies the chemical composition parameters of the toner by incorporating specific additives (silane-modified polymers, fluorinated compounds, metal salts) that change the surface properties and hydrophobicity of the toner particles, thereby reducing humidity sensitivity while maintaining production feasibility
Solution Approach 2:
The patent creates a composite toner structure by combining multiple materials including base resin, colorant, wax, and specially formulated humidity-resistant additives (silane-modified polymers, fluorinated compounds) to achieve both producibility and resistance to humidity-induced agglomeration
2Ease of manufacture
If existing processing equipment is used, then toner can be manufactured, but the process fails to adequately address humidity-related clogging issues
Solution Approach 1:
The patent modifies process parameters such as heating temperature (above glass transition temperature of latex), pH adjustment (adding base to reach pH 4-7), and sequential addition steps to enable the use of existing equipment while achieving humidity-resistant toner that prevents clogging
Solution Approach 2:
The patent incorporates humidity-resistant additives during the initial toner formation process rather than as a separate treatment step, allowing existing equipment to produce improved toner without requiring additional processing stages or equipment modifications
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 core-shell toner exhibits reduced sensitivity to relative humidity, maintaining stability and performance across varying humidity levels, with improved triboelectric charging characteristics and enhanced image quality in imaging processes.
Implementation Method 1
which reduces sensitivity to humidity through increased hydrophobicity
Implementation Method 2
heating the blend at a temperature below the glass transition temperature of the latex to form an aggregated toner core
Implementation Method 3
heating the core-shell toner at a temperature above the glass transition temperature of the latex
Implementation Method 4
Placing charge on the particles utilized to form toner, to enable movement and development of images via electric fields, is most often accomplished with triboelectricity
Data Source
AI summary
A toner having a core with a first latex having a specific glass transition temperature, and further having a shell surrounding the core with a second latex having a specific glass transition temperature and possessing functional groups, and processes for producing the same.