Yellow Ink Composition Light Ozone Resistance

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Inkjet recording methods face challenges with the deterioration of image fastness, particularly with yellow ink, which exhibits inferior light resistance compared to other colors, leading to color fading and tone changes when exposed to water, light, humidity, and environmental gases.

Innovation Solution

An ink composition comprising a first color material represented by Formula (A-I) and a second color material represented by Formula (B-V), with specific structural components and mass ratios, enhancing light resistance and ozone resistance while maintaining a desired hue.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If yellow ink uses conventional azo compounds as colorants, then the ink can be produced and applied, but the light resistance and ozone resistance are significantly lower than other colors, causing rapid fading and discoloration

Engineering Contradiction:

Improveimage fastnessVSAvoidlight resistance and ozone resistance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical parameters of the yellow ink colorant by introducing specific substituent groups (Ar3: divalent heterocyclic group, Ar4: alkyl/aryl/triazine group, R5: —OR6 or —NHR7 groups) into the azo compound structure. These parameter changes in molecular structure enhance the light resistance and ozone resistance while maintaining the desired yellow hue and printing density.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite colorant system by combining the specially structured azo compound (Formula A-I) with auxiliary compounds (Formula B-V) that have complementary properties. This composite approach synergistically improves overall image fastness, light resistance, and ozone resistance while maintaining color quality.

Inventive Principle:

Principle #40Composite materials

2Reliability

If the ink composition is modified to improve light resistance and ozone resistance, then fastness is enhanced, but the desired hue and printing density may be compromised

Engineering Contradiction:

Improvelight resistance and ozone resistanceVSAvoidhue accuracy and printing density

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent carefully adjusts chemical parameters including the types of substituents (Ar3, Ar4, R5), their positions, and the ratio n0 (0 or 1) to optimize both fastness and color properties. The divalent heterocyclic group Ar3 and aryl/triazine groups Ar4 are specifically selected to balance structural stability with color characteristics.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies local quality modifications by introducing specific functional groups at particular positions in the azo compound structure. The divalent heterocyclic group Ar3 and aryl/triazine groups Ar4 are positioned to provide localized protection against light and ozone while maintaining the overall color properties through controlled substitution patterns.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS9206326B2Ink composition, inkjet recording ink, and inkjet recording method

Publication Date: 2015.12.08 FUJIFILM CORP

AI summary

There is provided an ink composition which at least contains a first color material and a second color material, in which the first color material is a compound represented by Formula (A-I) described in the specification, and the second color material is at least one compound selected from a compound represented by Formula (B-I) described in the specification and a compound represented by Formula (B-V) described in the specification.