Fluorinated Polymeric Toner Additive for Charge Stability
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Solution Overview
Problem
Toner compositions used in electrophotographic printing face challenges with sensitivity to environmental conditions, such as humidity, leading to issues like image background complaints and charge degradation with developer aging, necessitating improved additives for enhanced performance.
Innovation Solution
A toner composition incorporating a polymeric additive with a fluorinated monomer, less than 10% crosslinked by weight, and optionally a nitrogen-containing charge control agent, which provides improved sensitivity to relative humidity and charge stability, applied to the surface of toner particles for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional inorganic additives are used to improve charge stability, then charge stability improves, but material usage increases and blocking properties worsen
Solution Approach 1:
The patent changes the chemical composition parameters of the additive by using fluorinated monomers with specific fluorine substitution patterns (TFEMA, HFDMA, HDFDMA) to achieve superior charge stability and blocking properties at lower concentrations compared to conventional inorganic additives
Solution Approach 2:
The patent creates a composite polymeric additive system combining fluorinated monomers with specific functional groups (carboxyl, hydroxyl, amino) to achieve multiple functions (charge control, blocking prevention, humidity resistance) in a single material that replaces multiple conventional additives
2Duration of action of stationary object
If polymeric additives with high crosslinking are used to improve durability, then durability improves, but sensitivity to environmental conditions worsens
Solution Approach 1:
The patent optimizes the crosslinking degree parameter to a specific range (5-50%) to balance durability and environmental sensitivity, and selects fluorinated monomers with specific molecular structures that provide inherent humidity resistance while maintaining appropriate polymer flexibility
Solution Approach 2:
The fluorinated polymeric additive acts as an intermediary layer on the toner surface that mediates between the toner particles and the humid environment, providing a protective barrier that reduces humidity sensitivity while maintaining additive durability
3Reliability
If more additive material is applied to improve charge control, then charge control improves, but blocking properties worsen
Solution Approach 1:
The patent changes the surface chemical properties of the additive by incorporating fluorinated monomers with specific fluorine substitution patterns that provide optimal charge control at low surface concentrations while the fluorinated hydrocarbon chains prevent excessive surface adhesion that would cause blocking
Solution Approach 2:
The fluorinated polymeric additive creates a thin surface layer that copies or mimics the desired charge control function of thicker conventional additive layers, achieving equivalent charge control with reduced material that prevents blocking
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 polymeric additive enhances the toner's sensitivity to environmental conditions and charge stability, offering better blocking properties and triboelectric charging characteristics with reduced material usage compared to inorganic additives.
Implementation Method 1
The polymeric additive enhances the toner's sensitivity to environmental conditions and charge stability, offering better blocking properties and triboelectric charging characteristics
Data Source
AI summary
Disclosed herein is a toner composition, developer and additive for a toner composition. The toner composition includes toner particles including at least one resin, an optional colorant, an optional wax, and a polymeric toner additive on at least a portion of an external surface of the toner particles. The polymeric toner additive includes a polymeric resin including a fluorinated monomer, wherein the polymeric resin is less than 10% by weight crosslinked, and optionally a charge control agent comprising nitrogen containing group at 0.1 wt % to 1.5 wt % of the polymeric resin.