Black Trisazo Dye Composition for Durable Neutral Inkjet Blacks

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Solution Overview

Problem

Current black trisazo dyes used in inkjet printing fail to meet requirements for durability, water resistance, light resistance, ozone resistance, and color tone consistency on nanoporous recording materials, particularly in quick-drying conditions.

Innovation Solution

Development of new trisazo dyes with specific chemical formulas (IV) and (V), which are highly soluble in aqueous solutions, providing excellent lightfastness and ozone resistance, and are suitable for use in inkjet printing and writing utensils, ensuring stable and neutral black color reproduction across various recording materials.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing black trisazo dyes are used in inkjet printing on nanoporous recording materials, then the printing process can be performed, but the images produced have insufficient water resistance, light resistance, ozone resistance, color tone, and brilliance

Engineering Contradiction:

Improveimage durabilityVSAvoidresistance to water, light, and ozone

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent modifies the chemical structure of trisazo dyes by introducing specific substituents (sulfonic acid groups, hydroxyl groups, and various aromatic rings with different electronic properties) to change the dye's molecular parameters. This structural modification improves the dye's resistance to water, light, and ozone while maintaining its coloring function on nanoporous recording materials

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates composite dye molecules combining multiple aromatic rings (naphthalene, benzene, pyridine rings) with specific functional groups in a trisazo structure. This composite molecular architecture provides enhanced stability and resistance properties that individual simpler dye structures cannot achieve, resulting in superior image durability under adverse conditions

Inventive Principle:

Principle #40Composite materials

2Illumination intensity

If dyes are used to produce high optical density images on quick-drying nanoporous recording materials, then the images have good color intensity, but they show aggregation on the surface known as 'bronzing'

Engineering Contradiction:

Improveoptical densityVSAvoiduniformity of dye distribution

Core Design Contradiction:

Illumination intensityVSStability of the object's composition

Solution Approach 1:

The patent introduces hydrophilic groups (sulfonic acid and hydroxyl groups) at specific positions on the dye molecule to create local polar regions. This local quality enhancement improves the dye's interaction with the aqueous ink medium and nanoporous recording material surface, ensuring uniform distribution and preventing aggregation that causes bronzing, while maintaining high optical density in the image areas

Inventive Principle:

Principle #3Local quality

3Ease of operation

If dyes are required to have good solubility in predominantly aqueous ink liquid, then the ink can be easily formulated, but the dyes must also penetrate into the recording material without showing aggregation

Engineering Contradiction:

Improvesolubility in aqueous inkVSAvoidpenetration and non-aggregation

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent modifies the dye's hydrophilicity parameter by incorporating sulfonic acid groups and hydroxyl groups into the molecular structure. These polar functional groups enhance water solubility for easy ink formulation, while the overall molecular architecture maintains appropriate hydrophobic character for penetration into the nanoporous recording material without aggregation

Inventive Principle:

Principle #35Parameter changes

4Productivity

If inkjet printers are required to print ever faster for economic reasons, then the printing speed increases, but the images must maintain good durability under unfavorable conditions which requires finely tuned dye systems

Engineering Contradiction:

Improveprinting speedVSAvoidimage durability under adverse conditions

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent optimizes the dye's molecular parameters including molecular weight, polarity, and functional group composition to achieve rapid uptake by nanoporous recording materials during quick-drying conditions. The modified trisazo structure maintains high affinity for the recording material surface, ensuring durable images even when printed at high speeds where contact time is minimal

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP2468822B1Black trisazo dyes, their preparation and their use

Publication Date: 2015.06.10 REX TONE IND

AI summary

Black trisazo dyes of the general formula (IV) or the general formula (V) wherein A is a radical of the general formula (VI) or a radical of the general formula (VII) and B is a radical of the general formula (VIII) or the general formula ( IX) and M, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, R17, R18, m, n, o and p is the have the meaning given in the description are excellent black dyes for dyeing and printing paper, other cellulosic materials and textile materials and for the production of recording liquids for ink jet printing and writing utensils.