Silica Particle Pore Control for Recording Medium Ink Absorbency
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Solution Overview
Problem
Conventional recording media with ink-receiving layers containing water-insoluble resins and silica particles face challenges in achieving optimal ink absorbency, film strength, and water resistance, particularly when exposed outdoors, due to the absorption of resin by silica particles, which reduces film strength and ink absorbency.
Innovation Solution
A recording medium with an ink-receiving layer containing silica particles with an average pore radius of 5.0 nm or less, ensuring sufficient oil absorption and ink absorbency while maintaining film strength, by controlling the absorption of water-insoluble resin within the silica particles, thereby enhancing water resistance and outdoor usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If silica particles with large pore radius are used in the ink-receiving layer, then ink absorbency is improved, but film strength deteriorates due to excessive resin absorption by silica particles
Solution Approach 1:
The patent applies parameter changes by precisely controlling the pore radius of silica particles to be 5.0 nm or less, and controlling the oil absorption value V/r to be 80 ((ml/100 g)/nm) or more. This parameter optimization resolves the contradiction by finding the optimal pore size that provides sufficient ink absorbency while limiting excessive resin absorption, thereby maintaining film strength.
Solution Approach 2:
The patent applies local quality by creating specific functional zones within the silica particles through controlled pore structure. The silica particles have optimized local pore characteristics (r ≤ 5.0 nm) that provide ink absorbency in the pore spaces while the particle framework maintains structural integrity and limits resin absorption, thus achieving both ink absorbency and film strength.
2Reliability
If water-insoluble resin is added to improve water resistance, then water resistance is improved, but ink absorbency deteriorates due to resin absorption by silica particles
Solution Approach 1:
The patent resolves this contradiction through parameter changes by controlling the pore radius to r ≤ 5.0 nm and the oil absorption ratio V/r ≥ 80 ((ml/100 g)/nm). These parameter constraints ensure that while water-insoluble resin is present for water resistance, the silica particles do not excessively absorb the resin, thereby preserving ink absorbency.
3Quantity of substance
If silica particles with high oil absorption are used to improve ink absorbency, then ink absorbency is improved, but film strength deteriorates due to excessive resin absorption
Solution Approach 1:
The patent applies parameter changes by establishing the specific relationship V/r ≥ 80 ((ml/100 g)/nm) where V is oil absorption and r is pore radius. This ratio constraint ensures that silica particles have sufficient ink absorbency capability while the pore size limitation (r ≤ 5.0 nm) prevents excessive resin absorption, thereby maintaining film strength.
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 effectively improves ink absorbency, film strength, and water resistance of the recording medium, ensuring it can withstand outdoor conditions without compromising ink absorbency or film integrity.
Implementation Method 1
the silica particle satisfies the following expressions 1 and 2 when an average pore radius thereof determined by the BJH method is taken as r (nm), and an oil absorption thereof measured by the linseed oil droplet method is taken as V (ml/100 g): expression 1: r ≤ 5.0 (nm) expression 2: V/r ≥ 80 ((ml/100 g)/nm)
Implementation Method 2
the ink-receiving layer contains a silica particle and a water-insoluble resin
Data Source
AI summary
A recording medium including a substrate and an ink-receiving layer provided on the substrate. The ink-receiving layer contains a silica particle and a water-insoluble resin. The silica particle satisfies the following expressions 1 and 2 when the average pore radius thereof determined by the BJH method is taken as r (nm), and the oil absorption thereof measured by the linseed oil droplet method is taken as V (ml/100 g): r≤5.0nm V/r≥80ml/100g/nm.