Polyester Toner Binder with Titanium Catalyst for Anti-Blocking
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Solution Overview
Problem
Conventional polyester resins used as toner binders for improving low-temperature fixing ability are poor in anti-blocking properties under high temperature and humidity conditions.
Innovation Solution
A polycondensation polyester resin produced in the presence of a titanium-containing catalyst, specifically represented by certain general formulas, is used as a toner binder to achieve both excellent anti-blocking and low-temperature fixing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the molecular weight or glass transition temperature of polyester resin is reduced to improve low-temperature fixing property, then low-temperature fixing ability is improved, but anti-blocking property under high temperature and humidity conditions deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the polyester resin by incorporating specific components (cyclic carbonate component and carboxylic acid component) in controlled amounts. This allows the resin to maintain appropriate molecular weight and glass transition temperature for low-temperature fixing while the specific composition provides enhanced anti-blocking properties through improved molecular structure and intermolecular interactions
Solution Approach 2:
The invention creates a composite polyester resin system by combining multiple components: basic polyester resin, cyclic carbonate component (10-50 mass%), and carboxylic acid component (5-30 mass%). This composite approach allows each component to contribute specific properties - the cyclic carbonate provides low-temperature flexibility while the carboxylic acid enhances anti-blocking performance, achieving both requirements simultaneously
2Temperature
If conventional polyester resin is used to improve low-temperature fixing ability, then low-temperature fixing property is improved, but anti-blocking property under high temperature and humidity conditions becomes poor
Solution Approach 1:
The invention modifies the chemical parameters of the polyester resin by controlling the content of cyclic carbonate component (10-50 mass%) and carboxylic acid component (5-30 mass%). These parameter changes alter the resin's molecular structure to provide both low-temperature fixing ability and resistance to blocking under high temperature and humidity conditions
Solution Approach 2:
The carboxylic acid component acts as an intermediary that enhances the resin's resistance to humidity and temperature-induced blocking. It modifies the intermolecular interactions in the resin matrix, providing a protective effect that prevents toner particles from adhering to each other under harsh environmental conditions while maintaining low-temperature fixing performance
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 provides a toner binder with enhanced anti-blocking properties under high temperature and humidity conditions while maintaining good low-temperature fixing properties, storage stability, and electrostatic performance without using environmentally harmful tin compounds.
Implementation Method 1
a polycondensation polyester resin produced in the presence of at least one titanium-containing catalyst (a) represented by the following general formula (I) or (II)
Data Source
AI summary
Disclosed herein is a polyester resin-based toner binder which can impart both excellent anti-blocking property under high temperature and humidity conditions and low-temperature fixing properties to a toner. The toner binder for developing electrostatic images includes a polycondensation polyester resin produced in the presence of at least one titanium-containing catalyst (a) represented by the following general formula (I) or (II):Ti(—X)m(—OH)n (I)O═Ti(—X)p(—OR)q (II)wherein X is a residue formed by removing H of one OH group from a (poly)alkanolamine having 2 to 12 carbon atoms; R is H or a C1 to C8 alkyl group which may have 1 to 3 ether bonds; m is 1 to 4, n is 0 to 3, and the sum of m and n is 4; and p is 1 to 2, q is 0 to 1, and the sum of p and q is 2 (m, n, p, and q are each an integer).