Impermeable-Surface Ink Composition for Low-Temperature Drying
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Solution Overview
Problem
Existing ink compositions fail to achieve adequate adhesiveness, rub resistance, and drying properties when used on impermeable base materials, particularly due to insufficient drying conditions and properties of the ink compositions.
Innovation Solution
An ink composition containing specific resins (acrylic, polyester, or urethane) and organic solvents with controlled surface tension differences and boiling points, along with water, to enhance film-forming properties and improve adhesiveness, rub resistance, and drying properties on impermeable surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drying conditions are strengthened (e.g., high drying temperature) to improve drying property, then the drying property is improved, but the impermeable base material may deform
Solution Approach 1:
The patent changes the chemical composition parameters of the ink, specifically incorporating resins with controlled glass transition temperatures and specific functional groups. This allows the ink to achieve adequate drying at lower temperatures through enhanced film-forming properties rather than relying on high thermal energy input, thus preventing base material deformation while maintaining reliable drying performance
2Shape
If the drying conditions are weakened (e.g., low drying temperature) to suppress base material deformation, then the base material deformation is suppressed, but the drying property becomes insufficient and the image becomes sticky
Solution Approach 1:
The patent modifies the ink composition by incorporating specific resins with controlled glass transition temperatures (Tg) and functional groups that enhance film-forming capability. This allows the ink to achieve adequate drying at lower temperatures through improved molecular-level film formation rather than relying on high thermal energy, thus maintaining both base material integrity and drying performance
Solution Approach 2:
The patent creates a composite ink system combining water, organic solvents, and specifically selected resins (acrylic, polyester, or urethane resins with controlled Tg and functional groups). This composite formulation works synergistically to achieve proper drying and adhesion on impermeable surfaces without requiring extreme drying conditions that would deform the base material
3Strength
If resin is added to improve film-forming property and adhesiveness, then the adhesiveness and rub resistance are improved, but the drying property may become insufficient due to weakened drying conditions
Solution Approach 1:
The patent precisely controls the resin parameters including glass transition temperature (Tg within -50°C to 0°C for acrylic resins, 50°C to 150°C for polyester resins, or -50°C to 50°C for urethane resins) and functional group content (0.1 to 10 mmol/g of carboxyl, hydroxyl, or amino groups). This parameter optimization ensures that the resin provides adequate film-forming and adhesion properties while maintaining compatibility with the water-based system and achieving proper drying without excessive stickiness
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 achieves excellent adhesiveness, rub resistance, and drying properties on impermeable materials by optimizing resin and solvent interactions, forming strong films and ensuring rapid solvent evaporation.
Implementation Method 1
the content of an organic solvent having a standard boiling point of 250°C or higher is 5 mass % or less... excellent drying properties
Data Source
AI summary
Provided are an ink composition for performing printing on an impermeable base material and an image recording method, which enable recording of an image with excellent adhesiveness, excellent rub resistance, and an excellent drying property on an impermeable base material. The ink composition for performing printing on an impermeable base material, including water (A), a resin (B) which is at least one selected from the group consisting of an acrylic resin, a polyester resin, and a urethane resin, and an organic solvent (C) which has a boiling point of 250°C or lower, has no nitrogen atom, and satisfies Expression (C1), in which a total content of the organic solvent (C) is in a range of 0.01% by mass to 5.0% by mass with respect to a total amount of the ink composition for performing printing on an impermeable base material. In Expression (C1), SPB represents an SP value of a main resin in the resin (B) in an MPa1/2 unit, SPC represents an SP value of the organic solvent (C) in the MPa1/2 unit, and |SPC - SPB| represents an absolute value of a difference between SPC and SPB. SPC−SPB≤10.0