Ink Jet Gray Ink Ozone Fastness via Cyan Dye Structure
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Solution Overview
Problem
Current gray inks used in ink jet recording methods suffer from low ozone fastness and light fastness, leading to color fading and metamerism issues, particularly with cyan ink components, which are prone to deterioration by ozone gases.
Innovation Solution
A specific combination of cyan, magenta, and yellow dyes, represented by certain chemical formulas, is used to inhibit the deterioration of cyan components, enhancing ozone fastness and light fastness, and improving color stability across different light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional cyan, magenta and yellow inks are used for gray ink formulation, then image quality with reduced grain feeling and excellent gradation is achieved, but ozone fastness and light fastness deteriorate leading to color fading
Solution Approach 1:
The patent changes the chemical parameters of the cyan coloring material by specifying a particular chemical structure (compound of formula 1) with specific substituents (sulfamoyl groups at positions 2 and 5, and carboxyl group at position 4). This parameter change in the molecular structure provides both excellent gray tone quality and improved ozone fastness, resolving the contradiction between image quality and reliability.
Solution Approach 2:
The patent uses a composite approach by combining the specific cyan coloring material (formula 1) with magenta and yellow coloring materials to create a gray ink formulation. This composite material achieves both the desired gray tone quality and enhanced ozone fastness, overcoming the limitations of conventional ink combinations.
2Reliability
If cyan ink with improved ozone fastness is developed, then color stability is enhanced, but metamerism issues and color fading under light exposure persist
Solution Approach 1:
The patent optimizes the chemical parameters of the cyan coloring material by introducing specific substituents (sulfamoyl groups and carboxyl group) at defined positions on the phthalocyanine core. This precise parameter adjustment achieves both ozone resistance and reduced metamerism, maintaining color stability across different lighting conditions.
Solution Approach 2:
The patent applies local quality modification by placing specific functional groups (sulfamoyl at positions 2 and 5, carboxyl at position 4) at strategic locations on the phthalocyanine molecule. This localized modification optimizes both ozone fastness and color consistency, preventing metamerism while maintaining molecular stability.
Data Source
AI summary
An ink containing at least two coloring materials of a first coloring material and a second coloring material, wherein the first coloring material is a compound represented by the general formula (I), and the second coloring material is a compound represented by the general formula (II):