Ink Composition Blocking Resistance via Polymerizable Compound Structure
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Solution Overview
Problem
Aqueous inks used for forming printed images often suffer from blocking issues, where ink is transferred from one printed medium to another when stacked, leading to image quality degradation.
Innovation Solution
An ink composition comprising a compound with a specific structure represented by Formula (I), a polymerization initiator, and water, along with a treatment liquid that forms aggregates, is applied to a recording medium to enhance curing sensitivity and blocking resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an aqueous ink containing a water-soluble polymerizable compound is used, then the ink can be applied to recording media and cured by ultraviolet irradiation, but blocking occurs when printed recording media are stacked, causing ink transfer between sheets
Solution Approach 1:
The invention changes the chemical structure parameters of the polymerizable compound by introducing specific functional groups (carboxyl, hydroxyl, or amine groups) at controlled ratios (0.1-10 mol%). This structural modification alters the curing characteristics and intermolecular forces, enabling the cured ink to resist blocking while maintaining water solubility and curability. The parameter change resolves the contradiction by optimizing the molecular structure to achieve both ease of application and blocking resistance.
Solution Approach 2:
The invention creates a composite ink composition by combining the specifically structured polymerizable compound (Formula I) with water and optional additives. This composite formulation integrates the benefits of water-based application with enhanced curing properties and blocking resistance, resolving the contradiction between ease of use and performance reliability.
2Reliability
If conventional aqueous inks are used, then the printing process is simple and environmentally friendly, but the cured ink lacks sufficient blocking resistance
Solution Approach 1:
Rather than complicating the ink composition with multiple components, the invention achieves enhanced blocking resistance by optimizing the key parameter - the structural formula of the polymerizable compound itself. This focused parameter change maintains relative composition simplicity while dramatically improving blocking resistance, resolving the contradiction between performance and complexity.
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 and treatment liquid combination effectively prevents ink transfer and improves image quality by promoting proper curing and aggregation, resulting in enhanced curing sensitivity and blocking resistance.
Implementation Method 1
a polymerization initiator and water; wherein the compound having the structure represented by Formula (I) is a water-soluble polymerizable compound
Implementation Method 2
an ink set including: the ink composition according to the first aspect of the invention; and a treatment liquid capable of forming an aggregate when contacting the ink composition
Data Source
AI summary
An ink composition includes a compound having a structure represented by the following Formula (I), a polymerization initiator and water; wherein, in Formula (I), R1 represents a hydrogen atom or a methyl group; X1 represents -O-or -NH-; A1 represents -O- or -NH-; M1 represents a metal atom; and n represents an integer of from 1 to 10.