Inkjet Coating Composition with Cationic Polymer and Surfactant
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Solution Overview
Problem
Aqueous inkjet coating compositions containing cationic polymers often suffer from inadequate jettability, making it difficult to jet them using inkjet print heads effectively.
Innovation Solution
An aqueous inkjet coating composition comprising a diallyldimethylammonium chloride polymer with a weight-average molecular weight between 300,000 and 600,000 g/mole, combined with an anionic surfactant, such as sulfosuccinate or alkyl sulfate, to enhance jettability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a cationic polymer is added to improve print quality, then print quality is improved, but jettability deteriorates
Solution Approach 1:
The patent changes the molecular weight parameter of the cationic polymer from conventional ranges to a specific high molecular weight range (300,000-600,000 g/mole for poly(diallyldimethylammonium chloride)). This parameter change allows the polymer to provide sufficient print quality improvement while maintaining adequate jettability, as the higher molecular weight polymer achieves the desired print quality enhancement with lower concentrations, thereby reducing its negative impact on jetting performance.
Solution Approach 2:
The patent creates a composite system by combining the cationic polymer (poly(diallyldimethylammonium chloride)) with specific anionic surfactants (sulfosuccinate or alkyl sulfate types). This composite approach allows the surfactant to mitigate the adverse effects of the cationic polymer on jettability while preserving the print quality benefits. The surfactant-polymer interaction modifies the overall composition properties to achieve both good print quality and acceptable jettability.
2Manufacturing precision
If the molecular weight of the cationic polymer is increased to improve print quality, then print quality is improved, but viscosity increases making jetting difficult
Solution Approach 1:
The patent optimizes the molecular weight parameter to a specific high range (300,000-600,000 g/mole) and controls the concentration of the polymer in the composition. By operating at lower concentrations of high molecular weight polymer, the patent achieves sufficient print quality improvement while keeping the viscosity increase manageable, thus maintaining jetting capability.
Solution Approach 2:
The anionic surfactant acts as an intermediary that interacts with the high molecular weight cationic polymer to modify the composition's flow properties. The surfactant reduces the adverse viscosity effects of the high molecular weight polymer, enabling the composition to maintain both the print quality benefits of high molecular weight polymer and the jetting performance requiring low viscosity.
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 combination of high molecular weight cationic polymer and anionic surfactant improves the ejection properties of the inkjet coating composition, ensuring it can be suitably jetted and applied onto a recording medium using an inkjet device, thereby improving print quality.
Implementation Method 1
the coating composition comprises a cationic polymer, the cationic polymer being a diallyldimethylammonium chloride polymer and an anionic surfactant
Data Source
Figure 1
Figure 2A~2B
Figure 2C
AI summary
The present invention relates to an aqueous ink jet coating comprising a cationic polymer and an anionic surfactant. The present invention further relates to a method for preparing such aqueous ink jet coating composition. In addition, the present invention relates to a method for applying an image onto a recording medium, using an aqueous ink jet coating.