Inkset with pH-Controlled Polymer for Ozone and Humidity Resistance
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Solution Overview
Problem
Current inkjet recording technologies face challenges in achieving balanced lightfastness, ozonefastness, and humidityfastness across different ink compositions, leading to uneven image degradation and poor color balance, particularly when exposed to light, ozone, and water.
Innovation Solution
An inkset comprising specific compounds in yellow, magenta, and cyan ink compositions, including diazo-based magenta ink compounds and phthalocyanine-based cyan dyes, with varying color densities and surfactants, is developed to enhance lightfastness, ozonefastness, and humidityfastness, while minimizing bronzing phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional ink compositions are used to achieve good coloring properties, then the image quality is improved, but the ozonefastness and humidityfastness deteriorate leading to discoloration and fading
Solution Approach 1:
The patent applies parameter changes by carefully controlling the pH value of the ink composition within a specific range (6.0-8.0) and adjusting the molecular weight and structural parameters of the polymer compound. These parameter optimizations enable the ink to achieve both good coloring properties and improved ozonefastness/humidityfastness, resolving the contradiction between image quality and storage stability.
Solution Approach 2:
The patent uses composite materials by combining specific polymer compounds with defined molecular weight ranges (10,000-1,000,000) and specific functional groups with traditional ink components. This composite approach creates an ink formulation that simultaneously provides excellent coloring properties and enhanced resistance to ozone and humidity, addressing both image quality and reliability requirements.
2Reliability
If the lightfastness, ozonefastness, and humidityfastness of individual ink compositions are improved, then the storage properties are enhanced, but the color balance deteriorates due to uneven degradation rates
Solution Approach 1:
The patent applies parameter changes by optimizing the pH value to a specific range (6.0-8.0) and controlling the molecular weight parameters of the polymer compound. These parameter adjustments ensure that all ink compositions in the set achieve similar degradation rates under light, ozone, and humidity exposure, maintaining color balance while improving overall storage properties.
Solution Approach 2:
The patent applies homogeneity by using polymer compounds with consistent molecular weight distributions and uniform structural characteristics across all ink formulations. This ensures that different ink compositions degrade at similar rates when exposed to environmental factors, preventing color balance shifts and maintaining uniform storage properties throughout the inkset.
3Manufacturing precision
If high color concentration ink compositions are used to achieve vivid images, then the coloring properties are improved, but the bronzing phenomenon increases reducing image quality
Solution Approach 1:
The patent applies parameter changes by controlling the pH value within a specific range (6.0-8.0) and optimizing the molecular weight parameters of the polymer compound. These parameter adjustments allow the ink to maintain high coloring properties while suppressing the bronzing phenomenon, as the optimized parameters prevent the chemical reactions that lead to bronzing even at high color concentrations.
Solution Approach 2:
The patent uses the polymer compound as an intermediary substance that mediates between the colorant and the recording medium. This intermediary polymer compound, with specific molecular weight and structural characteristics, enables high color concentration to be achieved while preventing direct interactions that cause bronzing, thus resolving the contradiction between coloring properties and bronzing suppression.
Data Source
AI summary
An inkset comprising at least a yellow ink composition, two types of magenta ink compositions of different color density, and a cyan ink composition:the magenta ink composition containing as a colorant at least one type of compound expressed by the formula M-1, and at least one type of compound expressed by the formula M-2,the yellow ink composition containing as a colorant at least one type of compound expressed by the formula Y-1the cyan ink composition containing as a cyan dye at least one type of compound selected from the compounds or salt thereof expressed by the formula C-1.