Aqueous Resin-Particle Ink for Adhesion on Impermeable Substrates
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Solution Overview
Problem
Existing image recording technologies face challenges in achieving excellent adhesiveness and suppressing streak unevenness when recording on impermeable base materials such as resin substrates.
Innovation Solution
An ink composition containing an aqueous medium and resin particles with specific glass transition temperatures and structural units, along with controlled acid values and hydrogen-bonding groups, is used to enhance adhesiveness and reduce streak unevenness on impermeable substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If inkjet recording is performed on impermeable substrates such as metal plates, glass, or ceramic, then the substrate can be printed with various patterns, but the ink does not permeate the substrate and causes drying during the recording process
Solution Approach 1:
A novel ink composition is introduced as an intermediary medium between the recording head and the impermeable substrate. The ink contains specific solvents and additives that prevent premature drying while enabling controlled deposition on non-porous surfaces, thus resolving the contradiction between substrate versatility and ink drying control.
Solution Approach 2:
The ink formulation is modified by adjusting chemical parameters such as solvent composition, volatility, and surface tension to optimize performance on impermeable substrates. These parameter changes enable the ink to maintain stability during recording without drying, while still achieving good adhesion and image quality on diverse substrates including metal, glass, and ceramic.
2Device complexity
If conventional ink formulations are used on impermeable substrates, then the recording process can be simplified, but the ink fails to permeate and dries out, resulting in poor image quality
Solution Approach 1:
The ink formulation parameters are specifically optimized for impermeable substrates, including solvent composition, viscosity, and drying characteristics. This enables conventional simplified recording processes to achieve high image quality without requiring complex process modifications, thus resolving the contradiction between process simplicity and image quality.
3Productivity
If the ink is designed to permeate the substrate quickly, then the recording speed can be increased, but the ink dries out before complete deposition on impermeable substrates
Solution Approach 1:
The ink's evaporation rate and permeation speed are carefully balanced by adjusting solvent composition and volatility parameters. This enables the ink to deposit completely on impermeable substrates at high recording speeds without drying out, resolving the contradiction between productivity and deposition completeness.
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 ink composition improves adhesiveness to impermeable base materials and suppresses streak unevenness by enhancing drying properties and wettability, resulting in high-quality image formation.
Implementation Method 1
image recording head to form an image
Data Source
AI summary
Provided are an ink for an impermeable base material, including an aqueous medium and resin particles, in which a resin of the resin particles has a glass transition temperature of -40°C or higher and 85°C or lower, the resin has at least one selected from the group consisting of a unit (1) to a unit (3), and at least one of an acid group or a salt of the acid group, an acid value of the resin is 0.10 mmol/g or greater and 2.65 mmol/g or less, and a proportion of a solvent having a boiling point of 250°C or higher in the aqueous medium is 3% by mass or less, and an image recording method. R2 represents a hydrogen atom or a C1 to C4 alkyl group, A2 represents -NH- or -N(L4-Y4)-, L2 and L4 represent a divalent group or a single bond, L3 represents a divalent group, and Y2 to Y4 represent a monovalent group.