UV Ink Adhesion via Quaternary Cationic Primer
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Solution Overview
Problem
Existing primer compositions for recording media often fail to provide sufficient and uniform adhesion of printing ink, particularly due to insolubility issues with polymeric cations in acrylate-based systems, and lack effective methods for uniform image application.
Innovation Solution
A radiation-curable primer composition incorporating a quaternary cationic component, such as ammonium functions, which is soluble and enhances adhesion by distributing evenly and forming a strong printed layer, combined with a method of applying this composition followed by a radiation-curable ink composition for improved image adhesion on various recording media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polymeric cations are added to aqueous primer solution to promote adhesion, then adhesion of printing ink is improved, but solubility in acrylate primer or ink vehicle deteriorates
Solution Approach 1:
The invention changes the chemical parameters of the cationic component by using quaternary ammonium compounds with specific molecular structures (containing acrylate or methacrylate groups) that enable solubility in non-aqueous acrylate primers while maintaining adhesion-promoting cationic functionality
Solution Approach 2:
The invention creates a composite molecular structure combining cationic adhesion-promoting groups (quaternary ammonium) with polymerizable acrylate/methacrylate groups in a single molecule, enabling both solubility in acrylate primers and effective adhesion promotion
2Strength
If primer composition is applied to recording medium to enhance adhesion, then ink adhesion is improved, but uniform distribution and application difficulty worsen
Solution Approach 1:
The invention optimizes the molecular weight and structural parameters of the quaternary cationic component to balance solubility (for uniform distribution) and adhesion efficiency (for strong bonding), enabling easy and uniform application while maintaining strong adhesion
Solution Approach 2:
The invention ensures homogeneous distribution of the cationic adhesion promoter throughout the acrylate primer matrix by designing molecules with appropriate solubility characteristics, preventing phase separation and enabling uniform application
3Strength
If quaternary cationic component is used to provide adhesion, then adhesion strength is improved, but curing efficiency may deteriorate
Solution Approach 1:
The invention designs composite molecules containing both quaternary ammonium groups (for adhesion) and acrylate/methacrylate polymerizable groups (for curing), enabling simultaneous achievement of strong adhesion and complete UV curing
Solution Approach 2:
The quaternary ammonium compound performs multiple functions simultaneously: adhesion promotion through cationic interaction with substrate, solubility in acrylate primer, and participation in UV curing through polymerizable groups, eliminating trade-offs between competing requirements
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 primer composition ensures strong and uniform adhesion of the printed layer on diverse recording media, including glass, through the use of a quaternary cationic component that is soluble and curable, allowing for effective image application and curing processes.
Implementation Method 1
their ionic interaction with negatively charged surface groups of the substrate
Implementation Method 2
a first radiation-curable component comprising a quaternary cationic function... a second radiation-curable component... curing the primer composition... curing the at least one radiation-curable ink composition
Data Source
AI summary
The present invention relates to a primer composition for a radiation-curable ink composition, a kit comprising the primer composition, a method of applying an image onto a recording medium using the primer composition.