Toner Binder with Crosslinked Polyester and Vinyl Resin
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Solution Overview
Problem
Conventional toner binders and toners fail to simultaneously achieve low-temperature fixability, offset resistance, high gloss, and durability while maintaining image strength, heat-resistant storage stability, and electrostatic charge stability.
Innovation Solution
A toner binder comprising a polyester resin crosslinked by carbon-carbon bonds and a vinyl resin with a specific monomer composition, where the vinyl resin contains a C21-C40 (meth)acrylate having an acyclic hydrocarbon group, providing a balanced combination of properties through melt-mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If polyester resin containing unsaturated carboxylic acid is used, then high-temperature offset resistance is improved, but low-temperature fixability deteriorates
Solution Approach 1:
The patent combines polyester resin (A1) with specific vinyl resins (B1-B4) containing long-chain (meth)acrylate monomers to create a composite binder system. This composite structure allows the polyester component to provide offset resistance while the vinyl resin component with flexible side chains maintains low-temperature fixability, resolving the contradiction between high-temperature stability and low-temperature application.
Solution Approach 2:
The patent modifies the chemical structure parameters of the binder by specifying vinyl resins containing C21-C40 (meth)acrylate monomers with particular side chain lengths and structures. This parameter optimization allows the binder to exhibit appropriate flow and adhesion properties at low fixation temperatures while maintaining sufficient thermal stability to prevent offsetting.
2Temperature
If crystalline vinyl resin is used, then low-temperature fixability is improved, but high-temperature offset resistance deteriorates
Solution Approach 1:
The patent creates a composite binder system where crystalline vinyl resin is combined with polyester resin containing unsaturated carboxylic acid. The crystalline vinyl resin provides low-temperature fixability through its melting behavior, while the polyester component contributes offset resistance through its thermal stability and crosslinking capability, thus resolving the contradiction.
Solution Approach 2:
The patent optimizes the chemical composition parameters by specifying the types and ratios of vinyl resin components (B1-B4) and polyester resin (A1) to achieve a balance where the binder melts sufficiently at low temperatures for fixation while maintaining adequate viscosity and adhesion at higher temperatures to prevent offsetting.
3Manufacturing precision
If larger nip width fixing devices are used, then surface properties of transfer materials are improved, but high-temperature offset phenomenon increases
Solution Approach 1:
The patent modifies the thermal and rheological parameters of the toner binder to enable effective fixation at lower temperatures and shorter times. By optimizing the glass transition temperature, melting behavior, and viscosity characteristics of the binder composition, the toner achieves adequate adhesion and surface quality even with larger nip width devices that have lower contact pressure and temperature gradients.
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 enables toners with enhanced low-temperature fixability, offset resistance, high gloss, and durability, while ensuring heat-resistant storage stability and electrostatic charge stability, thus addressing the limitations of existing toner technologies.
Implementation Method 1
a polyester resin (A) that is a resin obtained by crosslinking a polyester (A1) by one or more carbon-carbon bonds
Implementation Method 2
providing a balanced combination of properties through melt-mixing
Implementation Method 3
the toner image on the transfer material is thermally fixed to produce a multicolor image
Data Source
AI summary
The present invention relates to a toner binder containing: a polyester resin (A); and a vinyl resin (B), wherein the polyester resin (A) is a resin obtained by crosslinking a polyester (A1) by one or more carbon-carbon bonds, the vinyl resin (B) is a polymer containing a monomer (a) as an essential constituent monomer, the monomer (a) is a C21-C40 (meth)acrylate having an acyclic hydrocarbon group, and the weight proportion of the monomer (a) in monomers constituting the vinyl resin (B) is 15 to 99% by weight based on the weight of the vinyl resin (B).