Ink-Receiving Layer Coating for Scratch Resistance and Conveyance
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Solution Overview
Problem
Recording media with ink-receiving layers containing colloidal silica and alumina suffer from insufficient scratch resistance and conveyance characteristics, leading to issues with ink absorbency and uniformity in image formation.
Innovation Solution
A recording medium with an ink-receiving layer comprising cationized colloidal silica, alumina hydrate, and fumed alumina, where the colloidal silica content is 5% or more but 25% or less by mass, and the alumina hydrate to fumed alumina ratio is adjusted to enhance scratch resistance and ink absorbency by modifying the surface glossiness and pore size distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If colloidal silica content is increased to improve scratch resistance, then scratch resistance improves, but conveyance characteristics deteriorate
Solution Approach 1:
The patent optimizes the colloidal silica content parameter to a specific range (5-25% by mass based on total inorganic particles) to achieve the best balance between scratch resistance and conveyance characteristics. This quantitative parameter optimization resolves the contradiction by finding the optimal point where both requirements are satisfied simultaneously.
Solution Approach 2:
The patent uses a composite inorganic particle system comprising colloidal silica, alumina hydrate, and fumed alumina. This composite material approach allows the combination of particles with different properties: colloidal silica provides scratch resistance, while alumina hydrate and fumed alumina contribute to conveyance characteristics and ink absorbency, thereby resolving the contradiction between scratch resistance and conveyance.
2Strength
If colloidal silica content is increased to improve scratch resistance, then scratch resistance improves, but ink absorbency deteriorates
Solution Approach 1:
The patent employs a composite inorganic particle system where colloidal silica (5-25%) provides scratch resistance, while alumina hydrate and fumed alumina (comprising 75-95% of total inorganic particles) provide high ink absorbency. This composite approach allows simultaneous achievement of both scratch resistance and ink absorbency by leveraging the complementary properties of different inorganic particles.
Solution Approach 2:
The patent creates different functional zones within the ink-receiving layer by using particles with different properties. Colloidal silica particles are distributed to provide scratch resistance in the surface region, while alumina hydrate and fumed alumina particles are present to provide ink absorbency throughout the layer, achieving local optimization of different functions.
3Strength
If alumina hydrate to fumed alumina ratio is adjusted to enhance scratch resistance, then scratch resistance improves, but manufacturing complexity increases
Solution Approach 1:
The patent specifies a concrete ratio range for alumina hydrate to fumed alumina (95:5 to 55:45 by mass), which provides clear manufacturing guidance. By defining specific parameter ranges rather than open-ended ratios, the patent simplifies manufacturing while still achieving the desired scratch resistance through optimized particle composition.
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 improves conveyance characteristics, reduces susceptibility to scratching, and enhances ink absorbency, resulting in better image quality with uniform pigment granularity.
Implementation Method 1
The ink-receiving layer contains inorganic particles, and the inorganic particles contain cationized colloidal silica, alumina hydrate, and fumed alumina
Data Source
AI summary
A recording medium includes a substrate and an ink-receiving layer as the top layer. The ink-receiving layer contains inorganic particles. The inorganic particles contain cationized colloidal silica, alumina hydrate, and fumed alumina. A content of the cationized colloidal silica is 5% or more by mass and 25% or less by mass based on a content of the inorganic particles. The mass ratio of the alumina hydrate to the fumed alumina (alumina hydrate content:fumed alumina content) is from 95:5 to 55:45.