Ink Receiving Layer Crosslinking for Scratch Resistance
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Solution Overview
Problem
Ink jet recording methods face challenges in achieving high-quality image output at high transfer rates due to insufficient scratch resistance and bending resistance of existing recording media, leading to instability in ink ejection and image quality.
Innovation Solution
A recording medium with an ink receiving layer containing inorganic particles and specific compounds, such as dialdehyde starch and polyvinyl alcohol, which enhances mechanical strength and flexibility through crosslinking, thereby improving scratch resistance and bending resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a hardened conveying roller is used to improve conveyance accuracy, then conveyance accuracy is improved, but scratches or press traces occur on the recording medium
Solution Approach 1:
The patent changes the physical and chemical parameters of the ink receiving layer by introducing crosslinked structures through specific compounds (polyvinyl alcohol with boric acid for hydrogen bonding, or polyvalent metal salts for covalent bonding). This increases the hardness and scratch resistance of the layer, enabling it to withstand contact with hardened conveying rollers without suffering scratches or press traces, thus resolving the contradiction between conveyance accuracy and surface damage.
2Length of moving object
If a large curvature is given to the recording medium to decrease conveying distance, then conveying distance is decreased, but cracks occur in the recording medium
Solution Approach 1:
The patent modifies the mechanical properties of the ink receiving layer by creating crosslinked structures through chemical bonding (hydrogen bonding via boron or covalent bonding via metal atoms). This increases the bending resistance and flexibility of the layer, allowing the recording medium to be conveyed with large curvature without developing cracks, thus resolving the contradiction between shortened conveying distance and structural integrity.
3Strength
If the ink receiving layer is crosslinked through hydrogen bonding to improve scratch resistance, then scratch resistance is improved, but bending resistance becomes insufficient in high humidity environments
Solution Approach 1:
The patent creates a composite crosslinked structure by combining polyvinyl alcohol with boric acid to form hydrogen bonds, and additionally incorporating polyvalent metal salts to form covalent bonds. This dual-crosslinking system creates a composite material that maintains both scratch resistance (through the hydrogen bonding network) and bending resistance in high humidity (through the more stable covalent bonding framework), resolving the contradiction between scratch resistance and humidity-dependent bending resistance.
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 solution provides a recording medium with enhanced scratch resistance and bending resistance, ensuring high-quality image output even at high transfer rates and enabling the miniaturization of recording apparatuses.
Implementation Method 1
the hydroxyl groups of the polyvinyl alcohol have been crosslinked through hydrogen bonding via boron
Implementation Method 2
the hydroxyl groups of the polyvinyl alcohol have been crosslinked through covalent bonding via a metal atom
Data Source
AI summary
A recording medium having a base and an ink receiving layer containing an inorganic particle and at least one compound selected from a compound represented by the following formula (I) and a compound represented by the following formula (II):