Electrostatic Ink Composition High Opacity White Pigment
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Solution Overview
Problem
Existing electrostatic printing processes face challenges in achieving high opacity and efficient light scattering with traditional electrostatic ink compositions, particularly when printing white images, as they often require resin or charge adjuvants to function effectively.
Innovation Solution
The development of an electrostatic ink composition comprising chargeable white pigment particles with a basic species on their surface, present in high concentrations (at least 75 wt %) along with a charge director, which allows for high opacity and light scattering efficiency without the need for significant resin or charge adjuvants, by utilizing a high pigment loading and surface treatment to enhance dispersion and charging properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional electrostatic ink compositions are used, then the ink can function effectively in electrostatic printing, but the opacity and light scattering efficiency are insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the ink by incorporating basic species (such as basic pigments or basic compounds) that can interact with the photoconductive surface. This parameter change enables both high opacity through light scattering and maintains electrostatic printing functionality without requiring additional resins or charge adjuvants
Solution Approach 2:
The patent creates a composite ink composition by combining basic species with electrostatically active components. This composite material approach achieves multiple functions simultaneously: the basic species provide opacity and light scattering while the electrostatic components enable image transfer, resolving the contradiction between optical performance and printing functionality
2Reliability
If resin or charge adjuvants are added to improve ink functionality, then the ink can function effectively, but the opacity and light scattering efficiency are compromised
Solution Approach 1:
The patent extracts and eliminates the need for resin or charge adjuvants from the ink composition. By using basic species that inherently provide both optical scattering and electrostatic functionality, the patent removes these additional components that would otherwise compromise light scattering efficiency while maintaining ink functionality
Solution Approach 2:
The basic species in the patent serve multiple functions simultaneously: they provide opacity through light scattering, maintain electrostatic charge for image transfer, and eliminate the need for separate resin or charge adjuvant components. This multi-functionality resolves the contradiction by achieving both functionality and optical performance with a single component system
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
This approach enables the creation of a thin, highly opaque printed layer with improved light scattering efficiency, as the basic species on the pigment particles enhances charging and dispersion, resulting in effective image transfer and high opacity without the need for additional resin or charge adjuvants.
Implementation Method 1
chargeable white pigment particles with a basic species on their surface... the basic species on the pigment particles enhances charging
Implementation Method 2
high opacity and light scattering efficiency... improved light scattering efficiency
Implementation Method 3
charged toner particles adhere to the image areas of the latent image... transferring the charged particles in the form of the image to a print substrate
Data Source
AI summary
There is provided an electrostatic ink composition comprising chargeable particles comprising white pigment particles having a basic species on their surface; and a charge director; wherein the white pigment particles are present in an amount of at least 75 wt % based on the total weight of the non-volatile solids in the electrostatic ink composition. A method of manufacturing an electrostatic ink composition and a printed medium are also described.