Water-Based White Ink Composition for Heat-Resistant Flexible Packaging
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Solution Overview
Problem
Conventional white ink compositions for flexible packaging materials lack adequate heat resistance, blocking resistance, alcohol resistance, solid uniformity, and abrasion resistance, as well as exhibit bleeding issues.
Innovation Solution
An aqueous white ink composition comprising a white pigment, an acryl-based resin emulsion emulsified with a polymer, N-oleoyl sarcosine, a hydrazine-based compound with multiple hydrazine residues, and wax, with specific content and glass transition temperature ranges, enhances the ink's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an anionic surfactant is added to improve heat resistance, then heat resistance is improved, but blocking resistance, alcohol resistance, and solid uniformity deteriorate
Solution Approach 1:
The patent changes the chemical parameter of the surfactant from anionic to zwitterionic type (N-oleoyl sarcosine), which fundamentally alters the ink composition's interaction with the substrate and other components. This parameter change resolves the contradiction by achieving heat resistance through a different chemical mechanism that does not compromise blocking resistance, alcohol resistance, or solid uniformity
Solution Approach 2:
The patent creates a composite ink composition containing multiple components working synergistically: zwitterionic surfactant (N-oleoyl sarcosine) for heat resistance, hydrazine-based compound for adhesion and alcohol resistance, and acryl-based resin emulsion for film formation. This composite approach allows each component to contribute specific properties without the negative effects seen when using single-component systems
2Ease of manufacture
If conventional white ink composition is used for surface printing, then printing process is simple, but heat resistance, blocking resistance, alcohol resistance, abrasion resistance, and solid uniformity are insufficient
Solution Approach 1:
The patent modifies key parameters of the ink composition including surfactant type (zwitterionic), additive structure (hydrazine-based with specific molecular weight), and resin emulsion properties (glass transition temperature -40 to 30°C). These parameter changes enhance reliability while maintaining ease of manufacture through standard printing processes
Solution Approach 2:
The patent employs a composite formulation combining white pigment, zwitterionic surfactant, hydrazine-based compound, and acryl-based resin emulsion. This composite material approach achieves superior multi-performance characteristics (heat resistance, blocking resistance, alcohol resistance, abrasion resistance, solid uniformity) while remaining compatible with conventional printing methods
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 improved heat resistance, blocking resistance, alcohol resistance, abrasion resistance, solid uniformity, and reduced bleeding, ensuring better durability and print quality on flexible packaging.
Implementation Method 1
wherein a glass transition temperature of the acryl-based resin emulsion is -40 to 30°C
Implementation Method 2
N-oleoyl sarcosine, a hydrazine-based compound having at least two or more hydrazine residues in a molecule, and wax
Implementation Method 3
a hydrazine-based compound having at least two or more hydrazine residues in a molecule
Implementation Method 4
wax, wherein a content of the acryl-based resin emulsion is 3 to 40% by mass in terms of solid content
Data Source
AI summary
Provided is a water-based white ink composition for surface-printed flexible packaging, the water-based white ink composition having exceptional heat resistance, blocking resistance, alcohol resistance, scratch resistance, solid printing uniformity, and smudge resistance. A water-based white ink composition for surface-printed flexible packaging, the water-based white ink composition containing a white pigment, an acrylic resin emulsion emulsified by a polymer, N-oleoylsarcosine, a hydrazine compound having at least two or more hydrazine residues per molecule, and a wax, the acrylic resin emulsion content being 3-40 mass% in terms of solid content, and the glass transition temperature of the acrylic resin emulsion ranging from -40°C to 30°C.