Isosorbide Polyester Resin Toner Storage Stability
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Solution Overview
Problem
Polyester resins for toner described in existing patents are deficient in balance among storage stability, fixing property, hot offset resistance, and image stability.
Innovation Solution
A polyester resin for toner containing monomer units derived from isosorbide, 1,2-propanediol, and trimellitic acid or its anhydride, with specific proportions and glass transition temperatures, and produced using a polycondensation method that includes biomass-based monomers, to enhance storage stability, fixing property, and image stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If polyester resin is produced using isosorbide derived from plant raw materials, then environmental impact is reduced, but balance among storage stability, fixing property, hot offset resistance and image stability becomes deficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the glass transition temperature (Tg) within 50-80°C and the isosorbide content within 1-20 mass%. By adjusting these parameters, the resin achieves both environmental sustainability and optimal performance balance across storage stability, fixing property, hot offset resistance, and image stability.
Solution Approach 2:
The patent uses composite materials by combining isosorbide-derived polyester resin with specific additives and adjusting molecular structure through controlled polymerization. This creates a composite resin system that maintains environmental benefits while achieving balanced performance characteristics that single-component resins cannot provide.
2Stability of the object's composition
If glass transition temperature is increased to improve storage stability, then fixing property deteriorates
Solution Approach 1:
The patent resolves this contradiction by optimizing the glass transition temperature to a specific range of 50-80°C. This parameter optimization ensures that the resin has sufficient thermal stability for storage while maintaining adequate flexibility and adhesion for effective fixing performance.
3Stability of the object's composition
If isosorbide content is increased to improve storage stability, then image stability deteriorates
Solution Approach 1:
The patent resolves this contradiction by precisely controlling the isosorbide content within 1-20 mass%. This optimized concentration range provides sufficient storage stability through the cyclic structure of isosorbide while preventing excessive crystallinity that would harm image stability.
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 also reducing environmental impact through the use of biomass-based materials.
Implementation Method 1
a process of conducting polycondensation of a monomer mixture (A) containing a polyhydric alcohol containing isosorbide and 1,2-propanediol and a polycarboxylic acid containing trimellitic acid or its anhydride
Implementation Method 2
a glass transition temperature (Tg) of the polyester resin is from 56 to 70°C
Data Source
AI summary
The invention relates to a polyester resin for toner, the polyester resin containing a monomer unit derived from isosorbide and a monomer unit derived from 1,2-propanediol, in which the proportion of the monomer unit derived from isosorbide is from 2 to 11% by mass with respect to the total mass of the polyester resin, and a glass transition temperature (Tg) of the polyester resin for toner is from 56 to 70°C. According to the invention, it is possible to provide a polyester resin for toner from which toner excellent in storage stability, fixing property, hot offset resistance and image stability in the case of using isosorbide is obtained, and a method for producing the polyester resin for toner. In addition, the toner obtained from the polyester resin for toner of the invention is excellent in storage stability, fixing property, hot offset resistance and image stability in the case of using isosorbide.