Reactive Inkjet Fluid Set for Adhesion Without Resin Loading
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Solution Overview
Problem
Aqueous inkjet inks used for printing on non-absorbing substrates require additional resins to achieve adhesion and chemical resistance, which compromises jetting reliability and colloid chemical stability, making them unsuitable for industrial applications.
Innovation Solution
A fluid set comprising an aqueous inkjet ink with a pigment dispersion using a polymeric dispersing agent capable of reacting with primary or secondary amines, and a co-reactive fluid with functional groups selected from primary and secondary amines, eliminating the need for additional resins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If additional resins are integrated into aqueous ink jet inks to achieve adhesion and chemical resistance on non-absorbing substrates, then image quality and chemical resistance are improved, but jetting reliability and colloid chemical stability deteriorate
Solution Approach 1:
The patent extracts the binder resin from the inkjet ink formulation and places it in a separate co-reactive fluid applied as a primer or overcoat. This separation allows the ink to maintain its colloidal stability and jetting reliability while the external resin layer provides the necessary adhesion and chemical resistance on non-absorbing substrates.
Solution Approach 2:
The patent introduces a separate co-reactive fluid containing binder resins as an intermediary between the inkjet ink and the non-absorbing substrate. This intermediary layer provides the adhesion function that the ink itself cannot achieve, while the ink maintains its stability for reliable jetting.
2Strength
If additional resins are integrated into aqueous ink jet inks to achieve adhesion and chemical resistance on non-absorbing substrates, then image quality and chemical resistance are improved, but colloid chemical stability deteriorates
Solution Approach 1:
The patent extracts the binder resin from the inkjet ink formulation and places it in a separate co-reactive fluid applied as a primer or overcoat. This separation allows the ink to maintain its colloidal stability and jetting reliability while the external resin layer provides the necessary adhesion and chemical resistance on non-absorbing substrates.
3Strength
If primers composed of cationic compounds and multivalent metal ions are used to guarantee image quality on non-absorbing substrates, then adhesion performance is improved, but the system still requires additional resins in the ink jet ink
Solution Approach 1:
The patent merges the primer and inkjet ink into a single application step by formulating the ink with reactive dispersants that can crosslink with amino groups. This eliminates the need for separate primer application while maintaining adhesion performance, reducing system complexity.
Solution Approach 2:
The patent enables the inkjet ink to self-adhere to non-absorbing substrates through reactive dispersants that form crosslinks with amino groups on the substrate or primer. The ink performs the adhesion function itself without requiring external binder resins, achieving self-service capability.
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
This approach produces chemical-resistant images on non-absorbing substrates with improved reliability and stability, enhancing industrial applicability.
Implementation Method 1
a polymeric dispersing agent having at least three functional groups capable of reacting with primary or secondary amines
Data Source
AI summary
A fluid set for inkjet printing comprises an aqueous ink jet ink and a co-reactive fluid. The ink jet ink comprises a pigment and a polymeric dispersing agent having a functional group capable of reacting with a primary or secondary amine. The co-reactive fluid comprises a compound having at least two functional groups selected from the group consisting of primary amines and secondary amines. The co-reactive fluid is preferably a primer, an inkjet ink or an over print varnish.