Ink Receiving Layer Halide Ion Control for Metallic Image Gloss
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Solution Overview
Problem
Existing methods for recording color metallic images face challenges in maintaining color developability and glossiness over time, as high chloride ion content in the ink receiving layer leads to silver particle fusion but also causes degradation of glossiness due to silver chloride formation.
Innovation Solution
A recording method using a recording medium with an ink receiving layer containing a halide ion, either bromide or iodide, at a specific concentration (0.1 mmol/m² to 0.8 mmol/m²) to promote silver particle fusion while minimizing gloss degradation, by ensuring the halide ion content is within a range that prevents excessive silver halide crystal formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the ink receiving layer contains a high concentration of halide ions to promote silver particle fusion, then the metallic appearance and electrical conductivity are improved, but the glossiness degrades due to excessive silver halide crystal formation
Solution Approach 1:
The patent applies parameter changes by precisely controlling the halide ion concentration within a specific range (0.1-0.8 mmol/m²) rather than using high concentrations. This optimized parameter range enables sufficient silver particle fusion for metallic appearance while preventing excessive silver halide crystal formation that would cause whitening and gloss degradation.
2Reliability
If the halide ion content is increased to ensure complete silver particle fusion, then the color metallic image quality is improved, but the storage stability and color developability deteriorate due to whitening and discoloration
Solution Approach 1:
The patent changes the halide ion concentration parameter to an optimized range (0.1-0.8 mmol/m²) that balances silver particle fusion with storage stability. This parameter optimization prevents excessive silver halide formation during storage, thereby maintaining both image quality and storage stability without whitening or discoloration.
Solution Approach 2:
The patent introduces a specific halide ion concentration range as an intermediary condition that mediates between the competing requirements of silver particle fusion and storage stability. This intermediate concentration level enables sufficient metallic appearance while avoiding the harmful effects of excessive halide ion content during storage.
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 method achieves excellent color developability and sustained glossiness of recorded color metallic images, as the halide ion content optimally supports silver particle fusion without causing whitening or discoloration during storage.
Implementation Method 1
The ink receiving layer contains a halide ion selected from the group consisting of a bromide ion and a iodide ion... promotes silver particle fusion
Implementation Method 2
An ink that contains a metal particle has been used to form an electrical circuit by utilizing the electrical conductivity of the metal particle
Data Source
Figure 1A~1B
AI summary
A recording method includes a step of applying a first ink to a recording medium (32); and a step of recording an image on the recording medium (32) by applying a second ink so that the second ink at least partially overlaps a region to which the first ink has been applied. The first ink is an aqueous ink containing a silver particle. The second ink is an aqueous ink containing a coloring material. The recording medium (32) has an ink receiving layer that contains a halide ion selected from the group consisting of a bromide ion and an iodide ion. The ink receiving layer has a halide ion content (mmol/m2) of 0.1 mmol/m2 or more to 0.8 mmol/m2 or less.