Inkjet-Receptive Coating Composition for Rapid Drying and Water Resistance
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Solution Overview
Problem
Current inkjet printing technologies face challenges in achieving high image quality on various substrates, particularly due to limitations in ink absorption, drying speed, and water resistance, especially when printing on paper, plastic, or fabric, where the quality of inkjet papers is inferior to silver halide photography.
Innovation Solution
A compatible inkjet-receptive coating composition comprising a crosslinkable cationic terpolymer, adhesion promoter, crosslinker, binder, and water, applied to substrates like paper, polyester, or vinyl, to create glossy, rapidly drying, and water-resistant inkjet images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If swelling papers use water-soluble polymers to achieve high optical density, then image quality is improved, but drying speed decreases and water resistance is poor
Solution Approach 1:
The patent changes the chemical parameters of the coating by using a cationic terpolymer with specific functional groups (quaternized vinyl caprolactam, dimethylamino propyl methacrylamide, and hydroxyl ethyl methacrylate) in controlled proportions. This chemical composition change enables the coating to achieve high optical density while maintaining fast drying speed and water resistance through crosslinking reactions.
Solution Approach 2:
The patent creates a composite coating system combining the cationic terpolymer with a crosslinking agent (polyepoxy resin or polyvinyl alcohol with formaldehyde). This composite approach allows the coating to simultaneously achieve multiple properties: high optical density from the polymer matrix, fast drying from controlled water solubility, and water resistance from the crosslinked network structure.
2Reliability
If microporous papers use PE coated base to prevent ink absorption, then base impermeability is improved, but image quality depends chiefly on image receiving layers
Solution Approach 1:
The patent introduces an intermediary image receiving layer composed of the cationic terpolymer coating that sits between the PE coated base and the ink. This intermediary layer provides the necessary ink receptivity and image quality while the PE base maintains its impermeability function, effectively decoupling the two requirements.
Solution Approach 2:
The patent applies local quality by creating a specialized image receiving layer with specific chemical properties (cationic terpolymer with crosslinking capability) only where ink reception is needed, while the underlying PE base maintains its general impermeability function. This localized functional differentiation resolves the contradiction between base impermeability and image quality.
3Adaptability or versatility
If printing on plastic or fabric is performed, then substrate versatility is improved, but achieving fast ink drying times becomes more challenging
Solution Approach 1:
The patent creates a universal coating composition that can be applied to multiple substrate types (paper, plastic, fabric) with a single formulation. The cationic terpolymer with its specific functional groups and crosslinking mechanism provides consistent fast drying performance across different substrate materials, eliminating the need for substrate-specific coating formulations.
Solution Approach 2:
The patent uses parameter changes in the coating chemistry (specific polymer composition with controlled water solubility and crosslinking density) to achieve fast drying times on various substrates. The crosslinking reaction rate and polymer-water interaction parameters are optimized to ensure rapid drying regardless of the underlying substrate material.
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 achieves high gloss, rapid drying, low color density loss, and excellent water resistance, matching or exceeding the performance of control media in terms of image quality and durability.
Implementation Method 1
a crosslinkable cationic terpolymer... a crosslinker
Implementation Method 2
an adhesion promoter... coated onto a substrate such as paper, polyester or vinyl
Implementation Method 3
a binder... provide advantageous inkjet-receptive coatings on a substrate
Data Source
AI summary
Coating compositions for forming inkjet-receptive coatings on a substrate which are glossy, dry rapidly, provide good color density, exhibit low density loss, and are water-resistant, include (a) a crosslinkable cationic terpolymer, (b) an adhesion promoter, (c) a crosslinker, (d) a binder, and (e) water.