Polyester Resin Toner with Alkyl Groups for Fog Reduction
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Solution Overview
Problem
Conventional toner production methods using the dissolution suspension method often result in poor printing quality due to issues like fog, filming, and inadequate storage stability.
Innovation Solution
A toner is developed by dissolving or dispersing a binder resin with a long-chain alkyl group-modified polyester resin in an organic solvent and dispersing it in an aqueous medium containing an inorganic dispersant, optimizing the resin's hydrophobicity and acid value to prevent wax exposure and ensure proper toner formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional dissolution suspension method is used to produce toner, then production process is simple, but printing quality is poor
Solution Approach 1:
The invention changes the chemical parameters of the binder resin by specifying precise compositional ratios (6-12 mass% of component (A) with specific functional groups, 88-86 mass% of component (B) polyester resin with controlled acid value and molecular weight). These parameter changes in resin composition resolve the contradiction by enabling good printing quality while maintaining the simplicity of the dissolution suspension production method.
2Ease of manufacture
If binder resin with insufficient hydrophobicity is used, then production is easier, but wax separates and printing quality deteriorates
Solution Approach 1:
The invention changes the hydrophobicity parameter of the binder resin by controlling the acid value (4.0-8.0 mgKOH/g) and molecular weight (5,000-20,000), and by incorporating specific hydrophobic components (component A with 6-12 mass% containing carboxyl, hydroxyl, or amine groups). This resolves the contradiction by preventing wax separation and ensuring storage stability while maintaining ease of production.
Solution Approach 2:
The invention uses a composite binder resin system combining component (A) with specific functional groups and component (B) polyester resin, creating a composite material with optimized hydrophobicity. This composite structure prevents wax separation during storage while maintaining production ease through the dissolution suspension method.
3Reliability
If binder resin with excessive hydrophobicity is used, then storage stability improves, but toner becomes too hydrophobic causing poor development
Solution Approach 1:
The invention optimizes the hydrophobicity parameter by precisely controlling the acid value (4.0-8.0 mgKOH/g) and the ratio of hydrophobic to hydrophilic components in the binder resin. This balanced parameter control resolves the contradiction by achieving sufficient storage stability while maintaining good development performance through appropriate toner-resin interaction.
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 approach results in a clear toner with improved printing quality, reduced fog and filming, and enhanced storage stability, maintaining excellent glossiness and melt viscosity, thus addressing the limitations of conventional methods.
Implementation Method 1
dissolving or dispersing a binder resin and an additive in an organic solvent to prepare an oil phase component
Implementation Method 2
dispersing the oil phase component in an aqueous medium containing an inorganic dispersant dispersed in the aqueous medium
Data Source
AI summary
A toner for developing an electrostatic charge image, including toner particles obtained by dissolving or dispersing a binder resin and an additive in an organic solvent to prepare an oil phase component, and dispersing and granulating the oil phase component in an aqueous medium containing an inorganic dispersant dispersed therein, wherein the binder resin is a polyester resin obtained from an alcohol component, a carboxylic acid component, and a long-chain alkyl group represented by formula (1), the long chain alkyl group being present in a mole percent ranging from 6.5 to 7.5 mol % based on total number of moles of the alcohol component, the carboxylic acid component, and the long-chain alkyl group, and the polyester resin having an acid value of from 4.9 to 7.0 mgKOH/g: