Inkjet Coating Composition Using Cationic Polymer and Colloidal Silica
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current inkjet printing technologies face challenges in achieving glossy, water-resistant images on substrates like paper and plastic, with existing inkjet papers suffering from low image quality, slow drying, and limited water resistance, especially when printing on non-traditional surfaces like fabric.
Innovation Solution
A coating composition combining a cationic polymer, such as water-soluble polyvinylpyrrolidone or vinyl caprolactam, with colloidal silica of average particle size in the nanometer range, along with additional binders like polyvinyl alcohol and cationic polyurethane dispersion, to create a glossy and water-resistant inkjet-receptive coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If colloidal silica is used to form tough inkjet-printable coatings on substrates, then coating durability and toughness are improved, but achieving high gloss and water resistance becomes difficult
Solution Approach 1:
The patent combines colloidal silica particles with cationic polymers to create a composite coating system. The cationic polymer matrix provides water resistance and adhesion, while the colloidal silica particles contribute toughness and structural integrity. This composite approach allows simultaneous achievement of coating durability and water resistance that neither material could provide alone.
2Manufacturing precision
If swelling papers with water-soluble polymers are used to achieve high optical density, then image quality is improved, but drying time increases and water resistance decreases
Solution Approach 1:
The patent changes the chemical composition parameters of the coating by replacing water-soluble polymers with cationic polymers that form water-resistant networks. This parameter change maintains the ability to achieve high optical density through proper formulation while fundamentally altering the drying characteristics and water resistance properties of the coating system.
3Stability of the object's composition
If polyethylene coated base paper is used to make the base impermeable to ink, then ink absorption is prevented, but image quality becomes dependent solely on the image receiving layer mechanisms
Solution Approach 1:
The patent applies local quality by creating a specialized image receiving layer with specific cationic polymer and colloidal silica composition that optimizes ink interaction. Instead of relying on the entire base paper structure, the improvement is localized to the coating layer that directly contacts the ink, allowing the polyethylene base to maintain its impermeability function while the coating layer provides optimized image quality.
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 composition results in high-gloss, water-resistant inkjet images that dry quickly on various substrates, significantly improving image quality and durability compared to traditional methods.
Implementation Method 1
The composition results in high-gloss, water-resistant inkjet images that dry quickly on various substrates
Implementation Method 2
A coating composition combining a cationic polymer, such as water-soluble polyvinylpyrrolidone or vinyl caprolactam, with colloidal silica
Data Source
AI summary
A coating composition for forming a glossy, inkjet-receptive coating on a substrate includes (a) a cationic polymer, and (b) colloidal silica having an average particle size in the nanometer range.