Amorphous Polyester Toner with Ester Wax for Offset Resistance
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Solution Overview
Problem
Toner formulations containing polyester resin as a main binder component face issues with image noise (fog) and inadequate document offset resistance, leading to decreased image quality and hot offset problems.
Innovation Solution
A toner composition incorporating an amorphous polyester resin, a vinyl resin with a specific constitutional unit derived from a bifunctional (meth)acrylic acid ester monomer, and an ester wax as a releasing agent with a melting point of 65 to 90°C, which enhances elasticity and affinity, thereby reducing image noise and improving document offset resistance while maintaining low temperature fixability and hot offset resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a polyester resin is used as a main component of the binder resin to achieve low temperature fixability, then the low temperature fixability is improved, but the document offset resistance deteriorates and image noise occurs
Solution Approach 1:
The invention uses a composite binder resin system consisting of polyester resin (for low temperature fixability), vinyl resin (for elasticity and hot offset resistance), and amide resin (for document offset resistance). This composite approach allows each component to contribute its strengths, resolving the contradiction between low temperature fixability and document offset resistance.
Solution Approach 2:
The invention specifies precise compositional parameters: polyester resin 5-40 mass%, vinyl resin 10-40 mass%, and amide resin 5-30 mass%. By controlling these parameters within specific ranges, the invention optimizes the balance between low temperature fixability and document offset resistance, preventing both image noise and hot offset.
2Temperature
If a polyester resin is used as a main component of the binder resin to achieve low temperature fixability, then the low temperature fixability is improved, but image noise (fog) occurs leading to decreased image quality
Solution Approach 1:
The composite binder resin system with vinyl resin and amide resin additives prevents image noise by providing adequate elasticity and document offset resistance, while maintaining the low temperature fixability provided by the polyester resin base.
Solution Approach 2:
By controlling the vinyl resin content at 10-40 mass% and amide resin at 5-30 mass%, the invention ensures sufficient elasticity and inter-sheet separation, preventing image noise and fog while maintaining low temperature fixability.
3Temperature
If vinyl resin particles and hydrocarbon-based wax are added to improve hot offset resistance, then the hot offset resistance is improved, but document offset resistance remains insufficient and image noise occurs
Solution Approach 1:
The invention replaces hydrocarbon-based wax with amide resin, specifying 5-30 mass% amide resin content. This parameter change provides both hot offset resistance (through the vinyl resin component) and document offset resistance (through the amide resin component), eliminating image noise while maintaining hot offset performance.
Solution Approach 2:
The invention uses amide resin as a more effective replacement for hydrocarbon-based wax, providing superior document offset resistance and image quality without the drawbacks of the previous wax-based approach.
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 effectively suppresses image noise and enhances document offset resistance while maintaining low temperature fixability and hot offset resistance, ensuring improved image quality and reduced contamination of the photoreceptor.
Implementation Method 1
the releasing agent has a melting point of from 65 to 90° C. and contains an ester wax
Data Source
AI summary
A toner for electrostatic charge image development contains a binder resin and a releasing agent. The binder resin contains an amorphous polyester resin as a main component and a vinyl resin, the vinyl resin contains a constitutional unit derived from a specific monomer. The releasing agent has a melting point of from 65 to 90° C. and contains an ester wax.