Titanium Catalyst Polyester Toner Binder Anti-Blocking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Toner binders with polyester resin struggle to maintain good anti-blocking properties at high temperature and high humidity while also achieving low-temperature fixing ability, and often rely on organic tin catalysts that pose environmental concerns.
Innovation Solution
A toner binder comprising a condensation-polymerization polyester resin produced with a titanium catalyst of specific structure, which includes a Ti(—X)m(—OR)n formula, where R is a hydrocarbon group and X is a residue from an aromatic acid, providing excellent anti-blocking and low-temperature fixing properties without using organic tin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If polyester resin molecular weight or glass transition temperature is reduced to improve low-temperature fixing ability, then low-temperature fixing ability is improved, but anti-blocking property at high temperature and high humidity deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the glass transition temperature (Tg) of the polyester resin within 40-90°C and molecular weight Mn within 1,000-30,000 range. This optimization allows the resin to maintain appropriate softness for low-temperature fixing while preventing excessive flow that would cause blocking at high temperature and humidity.
Solution Approach 2:
The patent uses composite materials by combining polyester resin with specific additives including charge control agents, releasing agents, and pigments or dyes. This composite approach allows the binder to achieve low-temperature fixing ability through resin selection while additives provide anti-blocking properties and functional performance, resolving the contradiction between fixing temperature and anti-blocking performance.
2Ease of manufacture
If organic tin catalysts are used to produce polyester resin, then resin production is achieved, but environmental problems are caused
Solution Approach 1:
The patent applies the extraction principle by removing organic tin catalysts from the polyester resin production process and replacing them with alternative catalyst systems. This elimination of harmful substances maintains resin production capability while resolving environmental contamination issues associated with tin catalysts.
Solution Approach 2:
The patent employs disposable or easily removable catalyst alternatives that do not persist in the environment like organic tin. The new catalyst system performs its function during resin synthesis and can be completely removed or degraded, leaving no harmful residues in the final toner product or environment.
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 solution effectively enhances anti-blocking properties at high temperature and high humidity and maintains good low-temperature fixing ability, while avoiding environmental issues associated with organic tin catalysts.
Implementation Method 1
a condensation-polymerization polyester resin produced in the presence of a Ti catalyst with a specified structure
Data Source
AI summary
A polyester resin toner binder which gives a toner with good anti-blocking property at high temperature and high humidity and good low-temperature fixing ability. The present invention is directed to a toner binder for developing electrostatic charge images, which binder comprises a condensation-polymerization polyester resin, the polyester resin being a product formed in the presence of a catalyst (a) represented by the following general formula (I):Ti(—X)m(—OR)n (I)wherein R, X, m and n are as defined herein.