Ink Composition Blocking Resistance via Polymer Tg Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing aqueous ink compositions for ink-jet recording lack satisfactory blocking resistance, especially under high temperature and high humidity conditions, despite improvements in scratch resistance.
Innovation Solution
An ink composition comprising coloring particles coated with a water-insoluble polymer dispersant, self-dispersing polymer particles with specific glass transition temperatures and I/O values, and a hydrophilic organic solvent, along with a treatment liquid that forms aggregates when contacted, to enhance blocking resistance and image stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional aqueous ink compositions are used, then scratch resistance is improved, but blocking resistance deteriorates under high temperature and high humidity conditions
Solution Approach 1:
The patent applies parameter changes by carefully controlling the glass transition temperature (Tg) of the water-insoluble polymer dispersant within 50°C to 200°C and the I/O value within 0.15 to 0.60. These parameter optimizations enable the ink to achieve both good scratch resistance and blocking resistance under high temperature and high humidity conditions, resolving the technical contradiction between durability and reliability.
Solution Approach 2:
The patent uses composite materials by combining a water-insoluble polymer dispersant with specific functional characteristics (controlled Tg and I/O value) with aqueous ink components. This composite approach creates an ink formulation that simultaneously provides scratch resistance from the polymer coating and blocking resistance through the optimized molecular properties of the dispersant system.
2Adaptability or versatility
If pigments are dispersed in aqueous vehicles using conventional methods, then adaptability is improved, but product quality deteriorates due to poor pigment dispersibility
Solution Approach 1:
The patent applies parameter changes by optimizing the I/O value of the water-insoluble polymer dispersant within 0.15 to 0.60 and the glass transition temperature within 50°C to 200°C. These parameter adjustments significantly improve pigment dispersibility in aqueous vehicles while maintaining good adaptability, achieving satisfactory product quality that was previously unattainable with conventional dispersion methods.
3Strength
If images are formed with conventional ink compositions, then scratch resistance is improved, but blocking resistance deteriorates under high temperature and high humidity conditions
Solution Approach 1:
The patent applies parameter changes by controlling the glass transition temperature of the water-insoluble polymer dispersant within 50°C to 200°C and the I/O value within 0.15 to 0.60. This optimization ensures that images maintain both scratch resistance and blocking resistance even under high temperature and high humidity conditions, preventing the harmful blocking effect while preserving durability.
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 composition achieves good blocking resistance and stability under high temperature and high humidity conditions, ensuring high-quality image formation with improved scratch resistance and fixability.
Implementation Method 1
a treatment liquid that forms aggregates when contacted
Implementation Method 2
coloring particles containing a pigment that is coated with a water-insoluble polymer dispersant
Data Source
AI summary
An ink composition for ink-jet recording, including:coloring particles containing a pigment that is coated with a water-insoluble polymer dispersant, and self dispersing polymer particles containing a first polymer which includes a constituent unit derived from a hydrophilic monomer and a constituent unit derived from a hydrophobic monomer, and which has a glass transition temperature from 150°C to 250°C and an I/O value of from 0.20 to 0.55; an ink set including the ink composition; and an image forming method using the ink set are provided.