Liquid Developer Toner Resin Composite for Fusing
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Solution Overview
Problem
Existing liquid developers face challenges in achieving low-temperature fusing ability while maintaining hot offset resistance and wide temperature range fusibility, with enhanced particle size and viscosity control.
Innovation Solution
A liquid developer method involving toner particles with composite resins HC and LC, where resin H has a softening point of 100°C or higher and resin L has a softening point of 93°C or lower, chemically bonded via a dually reactive monomer, dispersed in an insulating liquid and subjected to wet-milling for improved particle size and viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If toner particles are dispersed in oil to form smaller particle sizes, then print quality is improved, but viscosity increases
Solution Approach 1:
The patent uses wet-milling to change the particle size parameters of toner particles to smaller sizes (D50: 3.0-5.0 μm) while simultaneously adjusting the insulating liquid composition (carrier liquid + plasticizer) to control viscosity parameters, thereby resolving the contradiction between small particle size and low viscosity
Solution Approach 2:
The patent creates a composite liquid developer system combining toner particles with specific resin compositions (polyester resin + styrenic resin in 85:15 to 50:50 mass ratio) dispersed in a composite insulating liquid (carrier liquid + plasticizer), achieving both small particle size and controlled viscosity through material composition optimization
2Reliability
If resin with high softening point is used, then hot offset resistance is improved, but low-temperature fusing ability deteriorates
Solution Approach 1:
The patent changes the softening point parameter of the resin from a single high value to a distributed range (90-130°C) by using a mixture of polyester resin (high softening point) and styrenic resin (lower softening point), enabling the toner to fuse across a wide temperature range (80-120°C) while maintaining hot offset resistance
Solution Approach 2:
The patent applies local quality by having different resin components serve different functions: polyester resin provides hot offset resistance (high temperature stability) while styrenic resin provides low-temperature fusing ability, with the combination creating local functional zones within the toner particle structure
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 method results in a liquid developer with smaller particle size, lowered viscosity, and wide temperature range fusibility, enhancing hot offset resistance and low-temperature fusing ability.
Implementation Method 1
toner particles are dispersed in an insulating liquid
Implementation Method 2
subjecting the dispersion of toner particles obtained in the step 2 to wet-milling
Implementation Method 3
a resin in which a polyester resin and a styrenic resin are chemically bonded via a dually reactive monomer
Data Source
AI summary
A liquid developer containing toner particles containing a resin and a pigment, wherein the toner particles are dispersed in an insulating liquid, wherein the resin contains a resin H having a softening point of 100°C or higher and a resin L having a softening point of 93°C or lower, wherein the resin H is a composite resin HC of a polyester resin and a styrenic resin, and the resin L is a polyester resin LP or a composite resin LC of a polyester resin and a styrenic resin, wherein the composite resin HC and the composite resin LC are each a resin in which a polyester resin and a styrenic resin are chemically bonded via a dually reactive monomer, and a method for producing the same. The liquid developer of the present invention is suitably used in development or the like of latent images formed in, for example, electrophotography, electrostatic recording method, electrostatic printing method or the like.