Cyan Ink Phthalocyanine Segmentation Ozone Bronzing
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Solution Overview
Problem
Cyan inks used in inkjet recording methods suffer from low ozone resistance and bronzing phenomena, leading to image fading and quality issues when exposed to light, moisture, or heat, particularly due to the high aggregation properties of phthalocyanine compounds.
Innovation Solution
A cyan ink formulation comprising a first coloring material represented by a specific structural formula and a second coloring material, both being phthalocyanine compounds with specific structural features, which reduce aggregation and enhance ozone and bronzing resistance by moderating the interaction between phthalocyanine rings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phthalocyanine compounds are used as coloring materials in cyan ink, then ozone resistance is improved, but bronzing phenomenon occurs due to high aggregation property
Solution Approach 1:
The patent divides the single phthalocyanine compound into two distinct compounds: a first phthalocyanine compound (formula 1) that provides ozone resistance and a second phthalocyanine compound (formula 2) that suppresses aggregation and bronzing. This segmentation allows each compound to specialize in different functions, resolving the contradiction between ozone resistance and bronzing resistance.
Solution Approach 2:
The patent creates a composite ink formulation containing both the first phthalocyanine compound and the second phthalocyanine compound together. This composite approach combines the beneficial properties of both compounds - the ozone resistance from the first compound and the aggregation-suppressing properties from the second compound - to achieve both improved ozone resistance and reduced bronzing phenomenon simultaneously.
2Reliability
If phthalocyanine compounds with high aggregation property are used, then ozone resistance is enhanced, but image quality deteriorates due to changed optical reflecting properties
Solution Approach 1:
The patent segments the phthalocyanine compound system into two distinct compounds with different aggregation behaviors. The first compound (formula 1) maintains the necessary aggregation for ozone resistance, while the second compound (formula 2) with its specific structural features (formula 3 substituent) controls aggregation to prevent bronzing and maintain optimal optical properties for image quality.
Solution Approach 2:
The patent changes the structural parameters of the phthalocyanine compounds by introducing specific substituents (formula 3) at defined positions (a1, a2, a3, a4) on the phthalocyanine ring system. This parameter change modifies the aggregation characteristics and optical properties of the coloring material, allowing simultaneous achievement of good ozone resistance and image quality.
3Reliability
If two kinds of phthalocyanine compounds are used to improve ozone resistance, then ozone resistance falls within acceptable range, but bronzing resistance becomes insufficient
Solution Approach 1:
The patent enhances the composite material formulation by ensuring both the first phthalocyanine compound (formula 1) and the second phthalocyanine compound (formula 2) are present in appropriate amounts. The second compound's specific structural features (formula 3 substituent at positions a1-a4) provide additional bronzing resistance beyond what the first compound alone can achieve, while maintaining acceptable ozone resistance levels.
Data Source
AI summary
The invention provides an ink containing a first coloring material and a second coloring material, wherein the first coloring material is a compound represented by a general formula (1), and the second coloring material is a compound represented by a general formula (2).