Inkjet-Receptive Coating Composition for Substrates
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Solution Overview
Problem
Existing inkjet printing technologies face challenges in achieving effective ink absorption and retention on substrates, leading to issues with image quality and durability.
Innovation Solution
A coating composition comprising poly(diallyldimethyl ammonium chloride), a crosslinkable cationic polymer, colloidal silica, silica gel, a binder such as vinyl acetate-ethylene copolymer, and water, which forms a matte-finished inkjet coating on substrates like polyester, vinyl, and paper, enhancing inkjet image quality with rapid drying, low color density loss, and water resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional inkjet printing is used on substrates, then the printing process is simple, but the ink absorption and retention are insufficient leading to poor image quality
Solution Approach 1:
The patent applies preliminary action by pre-treating the substrate surface with a specially formulated coating composition before inkjet printing. This coating layer is applied in advance to modify the substrate surface properties, creating optimal conditions for subsequent ink absorption and retention. The coating contains cationic polymers, colloidal silica, and binders that are prepared and applied before the printing process to ensure proper ink interaction.
Solution Approach 2:
The patent employs composite materials by formulating a multi-component coating composition that combines cationic polymers (such as poly(diallyldimethyl ammonium chloride) and crosslinkable cationic copolymers), colloidal silica, silica gel, and binder resins (vinyl acetate-ethylene copolymer). This composite formulation creates a synergistic effect where each component contributes specific properties: cationic polymers for ink attraction, silica particles for surface structure and absorption, and binders for adhesion, collectively achieving superior inkjet receptivity and image quality.
2Reliability
If a coating composition is applied to improve ink absorption, then ink retention improves, but the coating process and composition formulation become more complex
Solution Approach 1:
The patent applies parameter changes by carefully controlling and optimizing the concentrations of each component in the coating formulation, the particle size distribution of silica materials, the molecular weight and charge density of cationic polymers, and the crosslinking degree of the coating film. These parameter optimizations ensure reliable ink retention while managing formulation complexity through systematic control of key variables rather than arbitrary composition.
Solution Approach 2:
The coating composition acts as an intermediary layer between the substrate and the inkjet ink. This intermediate coating modifies the interface properties, providing a controlled environment for ink deposition and absorption. The cationic polymers and binder resins in the coating mediate the interaction between the hydrophobic substrate surface and the ink, facilitating reliable ink retention without requiring direct modification of the substrate or complex ink formulations.
3Productivity
If rapid drying is achieved, then productivity increases, but ink absorption and color density may be compromised
Solution Approach 1:
The patent applies local quality by creating a coating structure with different regions having distinct functions: the upper surface layer provides rapid water evaporation and drying properties for high productivity, while the lower layer and porous structure maintain high ink absorption capacity and color density retention. The colloidal silica and silica gel create a hierarchical pore structure that facilitates rapid moisture escape while trapping ink molecules, achieving both fast drying and excellent color density locally within different coating zones.
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 coating composition ensures excellent ink absorption and retention, resulting in high-quality, water-resistant, and adhesive inkjet images with improved color density and rapid drying on various substrates.
Implementation Method 1
an ability to absorb and retain the ink effectively
Implementation Method 2
forms a matte-finished inkjet coating on substrates... rapid drying
Data Source
AI summary
An inkjet coating composition for coating a substrate to absorb ink from an inkjet printer comprises a combination of (a) polydiallyldimethyl ammonium chloride (pDADMAC), (b) a crosslinkable cationic polymer, (c) colloidal silica, (d) silica gel, (e) a binder, preferably vinyl acetate-ethylene copolymer, and (f) water.