Ink Composition Blocking Resistance via Modified Polyallylamine
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Solution Overview
Problem
Aqueous inks face issues with blocking, where the ink transfers to other stacked printed matter, affecting the stability and durability of printed images.
Innovation Solution
An ink composition containing a modified polyallylamine or modified polyvinylamine with an ethylenically unsaturated double bond, a polymerization initiator, and water, which improves curing sensitivity and blocking resistance when used in conjunction with a treatment liquid that forms aggregates on a recording medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an ultraviolet ray curable aqueous ink is used to enhance fixing property, then image stability is improved, but blocking occurs when printed media are stacked
Solution Approach 1:
The patent changes the chemical parameters of the ink composition by introducing a polymerizable compound with specific functional groups (carboxyl or hydroxyl groups) that can form aggregates with treatment liquid components. This chemical parameter change enables the ink to transition from a state prone to blocking to a state that forms stable aggregates, resolving the contradiction between image stability and blocking resistance
Solution Approach 2:
The patent creates a composite system by combining the polymerizable compound in the ink with the treatment liquid applied to the recording medium. The interaction between these two components forms aggregates that simultaneously provide image fixing and prevent blocking, effectively resolving the technical contradiction through material composition design
2Speed
If a polymerizable compound is added to aqueous ink for UV curing, then curing sensitivity is improved, but blocking resistance deteriorates
Solution Approach 1:
The patent optimizes the molecular structure parameters of the polymerizable compound by selecting compounds with specific functional groups (carboxyl or hydroxyl groups) and controlling their molecular weight and structure. These parameter changes enable the compound to cure quickly under UV light while simultaneously forming aggregates with the treatment liquid to prevent blocking, thus resolving the contradiction between curing speed and blocking resistance
Solution Approach 2:
The patent introduces local quality differences by incorporating specific functional groups (carboxyl or hydroxyl groups) at specific locations in the polymerizable compound structure. These localized functional groups enable dual functionality: rapid UV curing through the polymerizable group and aggregate formation through the carboxyl/hydroxyl groups, thereby resolving the contradiction between curing sensitivity and blocking resistance
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 enhances the curing sensitivity and blocking resistance of printed images, preventing ink transfer and improving image stability and durability.
Implementation Method 1
An ink composition including a polymerization initiator, water, and a modified polyallylamine or modified polyvinylamine having an ethylenically unsaturated double bond in a side chain
Implementation Method 2
a treatment liquid that is capable of forming an aggregate when contacting the ink composition
Data Source
AI summary
An ink composition includes a polymerization initiator, water, and a modified polyallylamine or modified polyvinylamine having an ethylenically unsaturated double bond in a side chain thereof.