Oil-Based Ink Jet Recording Liquid Viscosity Control
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Solution Overview
Problem
Existing ink jet recording methods face challenges in preventing image strike-through over time and maintaining initial filling characteristics due to insufficient viscosity and pigment dispersion stability.
Innovation Solution
An oil-based ink jet recording liquid is developed, comprising a colorant and an oxidatively polymerizable oil-based medium with at least two unsaturated bonds, along with a metal soap or metal complex, which enhances viscosity and wettability, thereby improving image quality stability and initial filling characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If viscosity is increased to prevent strike-through, then image quality stability is improved, but initial filling characteristics deteriorate
Solution Approach 1:
The invention changes the chemical composition parameters of the oil-based medium by selecting specific compounds with iodine values of 100-400 and saponification values of 60-150. This parameter optimization allows the ink to achieve appropriate viscosity for preventing strike-through while maintaining good filling characteristics. The specific parameter ranges for iodine value and saponification value resolve the contradiction by finding the optimal balance point.
Solution Approach 2:
The invention uses a composite oil-based medium composed of multiple components including esters of dicarboxylic acids, polyols, and carboxylic acids. This composite formulation combines materials with different properties to achieve both high viscosity (for strike-through prevention) and good filling characteristics. The synergistic effect of the composite materials resolves the technical contradiction.
2Stability of the object's composition
If long-chain alkyl groups are introduced onto pigment surface by grafting, then pigment dispersion stability is improved, but strike-through prevention is insufficient
Solution Approach 1:
The invention changes the approach from modifying pigment surface chemistry to optimizing the bulk oil-based medium properties. By controlling the iodine value (100-400) and saponification value (60-150) parameters of the oil-based medium, the invention achieves both pigment dispersion stability and strike-through prevention without relying solely on pigment surface grafting.
Solution Approach 2:
The invention introduces the optimized oil-based medium as an intermediary substance that mediates between the pigment particles and the recording medium. This intermediary medium provides both dispersion stability for the pigment and appropriate viscosity to prevent strike-through, resolving the insufficiency of direct pigment surface modification alone.
3Reliability
If iodine value of oil-based medium is increased, then wettability and strike-through prevention are improved, but viscosity control becomes more difficult
Solution Approach 1:
The invention establishes specific parameter ranges for the oil-based medium: iodine value of 100-400 and saponification value of 60-150. These parameter specifications provide clear guidance for viscosity control while ensuring improved wettability and strike-through prevention. The defined parameter ranges resolve the complexity by providing actionable targets.
Solution Approach 2:
The invention applies local quality optimization by selecting specific functional groups and molecular structures in the oil-based medium components. The use of esters with specific iodine values and saponification values creates localized chemical properties that enhance wettability and prevent strike-through, while the overall composition maintains controllable viscosity.
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 excellent image quality stability and improved initial filling characteristics by increasing the iodine value of the oil-based medium, facilitating better wettability and preventing strike-through, as demonstrated by the ink composition's performance in printer tests.
Implementation Method 1
an oxidatively polymerizable oil-based medium having at least two unsaturated bonds
Implementation Method 2
enhances viscosity and wettability, thereby improving image quality stability and initial filling characteristics
Data Source
AI summary
An oil-based ink jet recording liquid includes a colorant and an oxidatively polymerizable oil-based medium having at least two unsaturated bonds. The ink jet recording liquid has an iodine value of greater than or equal to 65.