Ink Set for Ink Jet Recording with White Pigment Dispersion
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Solution Overview
Problem
Existing ink jet recording technologies face challenges in achieving good whiteness, hiding property, and abrasion resistance for white ink layers on light-transmissive media, with increased pigment and resin content leading to precipitation and viscosity issues, affecting preservation stability and clogging.
Innovation Solution
An ink set comprising a first ink without colorants and a second ink with titanium oxide particles, where the second ink contains less than 6 weight % of first resin particles, ensuring good whiteness and hiding properties while maintaining preservation stability by preventing resin particle solidification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the amount of white pigment is increased to enhance hiding property and whiteness, then the hiding property and whiteness are improved, but preservation stability decreases due to precipitation
Solution Approach 1:
The patent introduces a specific resin component as an intermediary substance that mediates between the white pigment particles and the ink vehicle. This resin prevents pigment aggregation and precipitation while maintaining high pigment concentration, thus improving both hiding property and preservation stability simultaneously
Solution Approach 2:
The patent changes the chemical parameters of the ink composition by selecting specific resin types and adjusting their molecular weight, functional groups, and concentration ratios. These parameter changes optimize the compatibility between pigment and resin, preventing precipitation even at high pigment loads
2Strength
If the amount of fixing resin is increased to enhance abrasion resistance, then the abrasion resistance is improved, but preservation stability decreases due to hard cake formation
Solution Approach 1:
The patent optimizes the molecular weight, functional group composition, and concentration of the fixing resin to achieve the desired abrasion resistance without excessive resin- pigment interaction. By carefully controlling these parameters, the resin provides sufficient binding strength while remaining compatible with the pigment dispersion
Solution Approach 2:
The patent creates a composite ink formulation where multiple resin components work synergistically with the white pigment. The composite structure provides both the necessary abrasion resistance and the chemical compatibility needed to prevent hard cake formation during storage
3Quantity of substance
If the white pigment and fixing resin are added in large amounts to satisfy image quality requirements, then the image quality is improved, but clogging occurs during ink jet ejection
Solution Approach 1:
The patent uses a specifically designed resin as an intermediary that maintains steric and electrostatic repulsion between pigment particles and resin aggregates. This prevents the formation of large flocs that could clog ink jet nozzles, even when high concentrations of pigment and resin are used to achieve excellent image quality
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 ink set achieves enhanced whiteness, hiding property, and abrasion resistance for images formed on light-transmissive media, with improved preservation stability and reduced clogging risks, as the titanium oxide particles are less likely to adhere to resin particles, maintaining ink stability during storage and ejection.
Implementation Method 1
a second ink containing titanium oxide particles
Implementation Method 2
the first resin particles can impart good abrasion resistance to an image
Data Source
AI summary
An ink set for ink jet recording is provided, the ink set including a first ink containing first resin particles and not substantially containing a colorant; and a second ink containing titanium oxide particles and containing the first resin particles in an amount less than 6 weight %, the second ink being ejected substantially at the same time as ejection of the first ink.