Isosorbide Polyester Toner Resin Fixing and Offset Balance
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Solution Overview
Problem
Toner containing conventional polyester resin lacks balance in storage stability, fixing property, hot offset resistance, and image stability, particularly when using isosorbide as a biomass material.
Innovation Solution
A polyester resin for toner comprising 9-25% isosorbide and 5-25 parts by mol of tri- or higher polyhydric carboxylic acid, with a softening temperature between 135-150°C, a glass transition temperature difference of 75°C or more, and a storage elastic modulus of 400-1000 Pa at 180°C, produced by esterifying a mixture at 230°C or lower, ensuring 30% biomass content, which enhances storage stability, fixing property, and hot offset resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If isosorbide is used as a biomass material in polyester resin for toner, then environmental burden is reduced, but balance among storage stability, fixing property, hot offset resistance, and image stability becomes insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the content of isosorbide (9-25 mass%) and tri- or higher polyhydric carboxylic acid (5-25 parts by mol) in the polyester resin, and controlling the softening temperature (135-150°C) and glass transition temperature difference (75°C or more). These parameter optimizations enable the resin to achieve both environmental sustainability and balanced performance in storage stability, fixing property, hot offset resistance, and image stability.
Solution Approach 2:
The patent uses composite materials by combining isosorbide (a biomass-derived polyhydric alcohol) with tri- or higher polyhydric carboxylic acids in specific proportions. This composite approach creates a polyester resin that maintains environmental benefits while achieving the required balance of functional properties through synergistic material combination.
2Temperature
If softening temperature is lowered to improve fixing property at low temperature, then fixing property improves, but hot offset resistance deteriorates
Solution Approach 1:
The patent optimizes the softening temperature parameter to a specific range of 135-150°C, and controls the glass transition temperature difference (T4-Tg) to be 75°C or more. This parameter optimization enables the resin to achieve good fixing property at relatively low temperatures while maintaining adequate hot offset resistance through the controlled temperature difference between softening and glass transition points.
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 resulting toner exhibits improved storage stability, fixing property, hot offset resistance, and image stability, while maintaining a high biomass content to reduce environmental burdens.
Implementation Method 1
esterifying or ester exchanging a mixture containing 9 to 25% by mass of isosorbide and 5 to 25 parts by mol of a constitutional unit derived from a tri- or higher polyhydric carboxylic acid
Implementation Method 2
esterifying or ester exchanging a mixture containing 9 to 25% by mass of isosorbide
Implementation Method 3
completing a polycondensation reaction at a softening temperature within a range of 135 to 150°C
Data Source
AI summary
This toner polyester resin contains 5-30 mass% of a constitutional unit derived from isosorbide, and has a storage elastic modulus (G') at 180°C of 400-1,000 Pa. This method for producing the toner polyester resin involves polycondensing a mixture containing 5-30 mass% of isosorbide and a polycarboxylic acid at 230°C or lower, and completing a polycondensation reaction at a softening temperature in the range of 135-150°C.