Ink Composition with Fluorinated Surfactant for Scratch Resistance
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Solution Overview
Problem
Images with urethane bonds often have higher friction and lower scratch resistance, necessitating the development of an ink composition that can form images with lower friction and higher scratch resistance.
Innovation Solution
An ink composition comprising water, particles with urethane or urea bonds, and a hydrophobic compound with an alkyl group of 8 or more carbon atoms, which localizes on the image surface upon curing, reducing friction and enhancing scratch resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If images are formed with urethane bonds, then adhesion and durability are improved, but friction increases and scratch resistance decreases
Solution Approach 1:
The patent applies local quality by creating a dual-structure image where the bulk contains urethane bonds for adhesion while the surface contains fluorinated groups for low friction. The ink composition includes both polyurethane acrylate (providing urethane bonds in the bulk) and fluorinated surfactant (providing fluorinated groups at the surface), allowing different regions of the image to have different properties: high adhesion internally and low friction externally.
Solution Approach 2:
The patent uses composite materials by combining polyurethane acrylate and fluorinated surfactant in the ink composition. This creates an image that is effectively a composite structure with urethane-based polymer matrix providing mechanical strength and adhesion, while fluorinated components provide surface-level friction reduction. The synergistic combination resolves the contradiction between needing strong bonding and low friction.
2Object-affected harmful factors
If surface energy is reduced to lower friction, then scratch resistance improves, but adhesion may be compromised
Solution Approach 1:
The patent implements local quality by concentrating fluorinated groups at the image surface to reduce surface energy and friction, while maintaining urethane bonds in the bulk to ensure adhesion. The fluorinated surfactant migrates to the surface during drying, creating a low-friction outer layer while the underlying polyurethane acrylate matrix maintains strong bonding to the substrate.
Solution Approach 2:
The patent changes the surface energy parameter by introducing fluorinated compounds with low surface energy (typically 10-20 mN/m) compared to conventional urethane surfaces. This parameter change at the surface level reduces friction and improves scratch resistance while the bulk composition maintains adhesion through urethane bonding mechanisms.
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 a significant decrease in surface energy, resulting in images with improved scratch resistance and reduced friction.
Implementation Method 1
a hydrophobic compound that has an alkyl group having 8 or more carbon atoms and has a molecular weight of 5000 or less
Implementation Method 2
which localizes on the image surface upon curing
Implementation Method 3
the particles have a polymerizable group
Data Source
AI summary
An ink composition including water, particles that include a polymer having at least one of a urethane bond or a urea bond and have a polymerizable group, and a hydrophobic compound that has an alkyl group having 8 or more carbon atoms and has a molecular weight of 5000 or less, a method for producing the ink composition, and an image-forming method.