Magenta Toner with Polyester Resin for Hot Offset
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Solution Overview
Problem
Conventional magenta toners using naphthol pigments suffer from poor dispersibility, leading to reduced transparency, color reproducibility, and image density due to light scattering, as well as issues with low-temperature fixability and compatibility with image-forming apparatuses.
Innovation Solution
A magenta toner formulation incorporating a binder resin, wax, and a colorant with a compound that includes naphthol, quinacridone, or lake compounds, where the colorant is dispersed within a polyester resin matrix, enhancing dispersibility and hot offset resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If naphthol pigments are used to achieve magenta color in toners, then color reproducibility and tinting strength are improved, but dispersibility deteriorates leading to light scattering and reduced transparency
Solution Approach 1:
The patent introduces a specific binder resin as an intermediary substance between the naphthol pigment particles and the toner matrix. This binder resin with controlled molecular weight and functional groups acts as a mediating agent that facilitates uniform dispersion of the pigment particles, preventing aggregation and light scattering while maintaining the desired magenta color properties
Solution Approach 2:
The patent optimizes specific parameters of the binder resin including molecular weight (5,000-50,000), acid value (10-50 mg KOH/g), and composition ratios to achieve the optimal balance between pigment dispersibility and color performance. By carefully controlling these parameters, the system achieves both good dispersibility and color reproducibility
2Manufacturing precision
If naphthol pigments are used for magenta toners, then color clarity is improved, but dispersibility of wax and other materials deteriorates, reducing low-temperature fixability and hot offset resistance
Solution Approach 1:
The patent creates a composite toner material system where the binder resin forms a matrix that accommodates both the naphthol pigment particles and wax materials. This composite structure with specific resin-wax-pigment interactions enables simultaneous achievement of color clarity, low-temperature fixability, and hot offset resistance by ensuring proper dispersion and adhesion of all components
3Manufacturing precision
If large amounts of dimethyl quinacridone are added to increase tinting strength, then color intensity is improved, but dispersibility and transparency deteriorate
Solution Approach 1:
The patent optimizes the concentration parameters of the colorant components and the binder resin properties to achieve the optimal tinting strength while maintaining transparency. By controlling the pigment loading within specific ranges and adjusting the binder resin characteristics, the system achieves high color intensity without sacrificing optical clarity
Data Source
AI summary
Provided is a magenta toner having a toner particle containing a binder resin, a wax and a colorant, wherein the colorant contains a specific amount of a compound (1), the colorant also contains one or more compounds selected from the group consisting of a naphthol compound, a quinacridone compound and a lake compound thereof in addition to the compound (1), and the binder resin contains a specific amount of a polyester resin.