Liquid Developer Polyester Resin Bonding
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Solution Overview
Problem
Existing liquid developers for electrophotographic processes suffer from insufficient bonding forces between binder resins and inorganic oxides, and between acid group-containing resins and particle dispersing agents, leading to unsatisfactory developing performance.
Innovation Solution
A liquid developer comprising a carrier liquid, toner particles with a polyester resin having an acidic group and a polymer with a primary amino group, where the acid value of the polyester resin is at least 5 mg KOH/g and the pKa of the acidic group is not more than 3.4, and the primary amino group is positioned other than the end of the polymer chain, enhancing bonding and dispersion stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a binder resin and inorganic oxide are used in a liquid developer, then cleaning property and hot offset resistance are improved, but the bonding force between binder resin and inorganic oxide is insufficient leading to unsatisfactory developing performance
Solution Approach 1:
The patent introduces a polymer with primary amino groups as an intermediary substance between the binder resin and inorganic oxide particles. This polymer acts as a bonding mediator that forms strong chemical bonds with both the resin and oxide surfaces, resolving the insufficient bonding force problem while maintaining the cleaning and hot offset resistance properties provided by the inorganic oxide components.
Solution Approach 2:
The patent creates a composite structure consisting of binder resin, inorganic oxide particles, and polymer with primary amino groups. This multi-component composite system combines the cleaning properties of inorganic oxide with the bonding capability of the amino-containing polymer, achieving both improved reliability and sufficient bonding strength simultaneously.
2Stability of the object's composition
If a particle dispersing agent is used to improve dispersion stability, then dispersion stability of colored resin particles is improved, but the bonding force between acid group-containing resin and particle dispersing agent is insufficient leading to unsatisfactory developing performance
Solution Approach 1:
The polymer with primary amino groups serves as an intermediary that bonds to acid group-containing resins through strong chemical interactions. This intermediary polymer then disperses the colored resin particles effectively, resolving both the bonding force deficiency and maintaining dispersion stability simultaneously.
3Strength
If the acid value of polyester resin is increased to improve bonding, then bonding force is improved, but the pKa of acidic group must be controlled to ensure proper interaction with amino groups
Solution Approach 1:
The patent specifies precise parameter ranges for the polyester resin: acid value of 3-20 mg KOH/g and pKa of 2.0-3.4. By controlling these chemical parameters, the resin achieves optimal bonding strength with amino group-containing polymers while maintaining compatibility and preventing excessive reactivity or poor interaction.
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 liquid developer with high volume resistivity and excellent developing performance by strengthening the bonding between the polyester resin and the polymer, thereby improving dispersion stability and reducing separation into the carrier liquid.
Implementation Method 1
a polymer having a primary amino group and soluble in the carrier liquid... an acid value of the polyester resin is at least 5 mg KOH/g; a pKa of the acidic group is not more than 3.4
Implementation Method 2
a step of distilling off the solvent from the mixed liquid
Data Source
AI summary
A liquid developer comprising a carrier liquid, a toner particle insoluble in the carrier liquid, and a polymer having a primary amino group and soluble in the carrier liquid, wherein the toner particle comprises a polyester resin having an acidic group, an acid value of the polyester resin is at least 5 mg KOH/g, a pKa of the acidic group is not more than 3.4, and the polymer having a primary amino group has a primary amino group at a position other than the end of a main chain of the polymer, and method of producing thereof.