Nonaqueous Inkjet Ink Composition for Particle Redispersion
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Solution Overview
Problem
Inkjet inks containing inorganic particles face issues with sedimentation during storage, leading to difficulty in redispersing settled particles, which affects discharge stability and nozzle integrity.
Innovation Solution
A nonaqueous inkjet ink formulation comprising inorganic particles and silicone resin particles with specific size ratios and properties that enhance redispersibility, fluidity, and nozzle protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic particles are used in inkjet ink, then the ink provides desired functional properties (whiteness, conductivity), but the inorganic particles easily settle during storage
Solution Approach 1:
The patent introduces a polymer compound as an intermediary substance that specifically interacts with inorganic particles to prevent their aggregation and settlement. The polymer acts as a mediator between the inorganic particles and the ink medium, providing steric or electrostatic stabilization that maintains particle dispersion throughout storage.
Solution Approach 2:
The patent modifies the chemical and physical parameters of the ink system by selecting polymers with specific molecular weights, functional groups, and hydrophilic-lipophilic balances. These parameter changes optimize the polymer's ability to adsorb onto inorganic particle surfaces and provide repulsive forces that prevent settlement.
2Stability of the object's composition
If inorganic particles settle, then storage stability is reduced, but redispersing the settled particles becomes difficult
Solution Approach 1:
The patent applies preliminary action by incorporating the polymer compound into the ink formulation before any settlement can occur. The polymer pre-coats the inorganic particle surfaces and establishes protective barriers that prevent strong aggregation, making future redispersion much easier if settlement does occur during storage.
Solution Approach 2:
The polymer compound serves as a mediator that remains associated with the inorganic particles even after settlement. This intermediary substance provides a lubricating or repulsive effect that reduces the strength of particle-particle interactions, enabling easy redispersion through gentle agitation without requiring harsh reprocessing.
3Reliability
If inorganic particles are used, then the ink achieves desired properties, but discharge stability deteriorates due to sedimentation
Solution Approach 1:
The polymer compound acts as an intermediary that maintains uniform particle distribution in the ink, ensuring consistent discharge characteristics. By preventing particle aggregation and settlement, the polymer mediator ensures that each discharge contains the intended concentration and distribution of functional inorganic particles.
Solution Approach 2:
The patent optimizes parameters such as polymer concentration, molecular weight, and functional group composition to achieve the right balance between preventing settlement and maintaining discharge stability. These parameter adjustments ensure that the ink flows consistently while keeping inorganic particles uniformly dispersed.
4Reliability
If inorganic particles are used in inkjet ink, then functional properties are provided, but nozzle damage increases due to sedimentation
Solution Approach 1:
The patent applies beforehand cushioning by having the polymer compound pre-protect the inorganic particle surfaces before they can settle and aggregate into harmful deposits. This protective polymer layer acts as a cushion that prevents direct particle-to-nozzle contact and reduces mechanical damage during the discharge process.
Solution Approach 2:
The polymer compound serves as a protective intermediary between the inorganic particles and the nozzle components. This mediator layer reduces friction and mechanical stress during particle discharge, preventing wear and damage to the delicate nozzle structures while still allowing functional particles to be delivered.
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 formulation effectively prevents sedimentation and facilitates easy redispersement of inorganic particles, maintaining discharge stability and reducing nozzle damage.
Implementation Method 1
the inorganic particles easily settle in the ink during storage or waiting before discharge
Implementation Method 2
redispersibility of inorganic particles that have settled
Data Source
AI summary
To provide a nonaqueous inkjet ink having excellent redispersibility of inorganic particles that have settled. A nonaqueous inkjet ink includes inorganic particles and silicone resin particles. The silicone resin particles have an average particle size of 0.3 µm or more and 10 µm or less, and the average particle size of the silicone resin particles is smaller than a median diameter of the inorganic particles.