Naphthol Azo Pigment Composition for Stable Bright Dispersion

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Solution Overview

Problem

Existing naphthol-based azo pigments face issues with dispersibility, leading to poor coloring properties, brightness, and transparency in applications like aqueous and non-aqueous dispersions, particularly in paints and printing inks, resulting in viscosity increases during long-term storage.

Innovation Solution

A coloring agent comprising a naphthol-based azo pigment and a specific compound, represented by General Formulas (1) and (2), enhances dispersibility and improves coloring properties and transparency by forming a hydrophobic surface through the aromatic ring moiety of the compound (B) adsorbing to the surface of compound (A), stabilizing pigment dispersion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If naphthol-based azo pigments are used for coloring applications, then production cost and fastness are improved, but dispersibility and brightness are insufficient

Engineering Contradiction:

ImprovefastnessVSAvoidbrightness

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The patent combines naphthol-based azo pigment (compound A) with a specific compound (compound B) having aromatic rings and hydrophobic groups to create a composite coloring agent. This composite structure improves brightness and dispersibility while maintaining the fastness properties of the original pigment, resolving the contradiction between fastness and brightness.

Inventive Principle:

Principle #40Composite materials

2Reliability

If naphthol-based azo pigments are used for coloring applications, then production cost and fastness are improved, but dispersibility is insufficient

Engineering Contradiction:

ImprovefastnessVSAvoiddispersibility

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent creates a composite material by combining the naphthol-based azo pigment with compound B that has improved dispersibility characteristics. The compound B acts as a dispersing agent integrated into the pigment structure, enabling better dispersion in various media while preserving the fastness properties of the original pigment.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

Compound B serves as an intermediary between the pigment particles and the dispersion medium. Its molecular structure with aromatic rings and hydrophobic groups allows it to bridge the pigment and the surrounding medium, improving dispersibility without compromising the pigment's fastness characteristics.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If pigment dispersibility is poor in aqueous and non-aqueous dispersions, then production cost is reduced, but coloring property, brightness, and transparency are insufficient

Engineering Contradiction:

Improveproduction costVSAvoidcoloring property

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent develops a composite coloring agent that integrates dispersing functionality into the pigment structure itself. This approach maintains cost-effectiveness while significantly improving coloring properties, brightness, and transparency by ensuring uniform dispersion at lower pigment concentrations.

Inventive Principle:

Principle #40Composite materials

4Ease of manufacture

If pigment dispersibility is poor, then production cost is reduced, but transparency is insufficient

Engineering Contradiction:

Improveproduction costVSAvoidtransparency

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The composite structure with compound B integrated into the pigment provides inherent dispersibility that prevents aggregation and maintains transparency. This eliminates the need for additional dispersing agents or complex processing steps, keeping production costs low while achieving high transparency.

Inventive Principle:

Principle #40Composite materials

5Device complexity

If pigment dispersion is not stabilized, then production process is simplified, but viscosity increases during long-term storage

Engineering Contradiction:

Improveproduction process complexityVSAvoidviscosity stability

Core Design Contradiction:

Device complexityVSStability of the object's composition

Solution Approach 1:

The patent creates a self-stabilized pigment dispersion by incorporating compound B into the pigment structure. This composite structure provides steric and electrostatic stabilization that prevents pigment aggregation over time, maintaining viscosity stability without requiring complex stabilization processes or additional additives.

Inventive Principle:

Principle #40Composite materials

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution provides a coloring agent with improved dispersibility, brightness, and transparency, maintaining hue stability and viscosity stability in various applications, including printing inks, by optimizing the content ratio of compounds (A) and (B).

Implementation Method 1

the aromatic ring moiety of the compound (B) adsorbing to the surface of compound (A)

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentEP4692249A1Coloring agent, coloring composition, and method for producing coloring agent

Publication Date: 2026.02.11 TOYO INK MFG CO LTD

AI summary

A coloring agent comprising a compound (A) represented by general formula (1) and a compound (B) represented by general formula (2).