Multi-Metal Azo Pigment Composition for Stronger Yellow Color
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Solution Overview
Problem
Existing metal azo pigments based on azobarbituric acid and nickel or zinc salts require further improvement in performance features, particularly in color strength for applications such as plastics, lacquers, and LCD color filters.
Innovation Solution
Development of metal azo pigments comprising at least three metal azo compounds with different metal types, including zinc, nickel, and additional metal ions like lanthanum, cerium, and strontium, in combination with melamine derivatives, which form specific structural units and adducts to enhance color strength and dispersibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal azo pigments are prepared from azobarbituric acid with nickel salts and zinc salts, then yellow pigment properties are achieved, but color strength and performance features require further improvement
Solution Approach 1:
The patent combines multiple metal salts (nickel, zinc, and at least one additional metal from groups 1-12 of the periodic table) to form a composite metal azo pigment. This merging of different metal components creates a synergistic effect that enhances color strength and performance features beyond what single-metal pigments can achieve
Solution Approach 2:
The invention creates a composite pigment material consisting of azobarbituric acid complexed with multiple metal ions. This composite structure allows optimization of both coloristic properties (through metal composition ratios) and performance properties (through controlled surface coverage), resolving the contradiction between color strength and composition complexity
2Ease of operation
If controlled surface coverage with covering agent is applied to improve dispersion properties, then dispersion hardness is lowered, but color intensity is reduced
Solution Approach 1:
The patent optimizes the surface coverage parameter by controlling the amount and type of covering agent applied to the pigment particles. By precisely adjusting this parameter, the invention achieves an optimal balance where dispersion properties are sufficiently improved while color intensity loss is minimized
Solution Approach 2:
The covering agent is applied to provide local quality improvement at the particle surface without affecting the bulk pigment properties. This localized modification enhances dispersion characteristics while preserving the core pigment's color strength
3Adaptability or versatility
If heat treatment is applied to alter particle size and specific surface area, then performance-based properties are adjusted, but additional processing steps are required
Solution Approach 1:
The patent incorporates heat treatment as a preliminary or integrated step in the pigment production process. By performing this treatment during or immediately after pigment synthesis, the invention achieves particle size and surface area optimization without requiring separate, complex post-processing equipment
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 resulting pigments exhibit improved color strength and adjustability, enabling better performance in coloration of plastics and LCD color filters with enhanced dispersibility and stability.
Implementation Method 1
metal azo compounds which differ at least in the type of metal and which each contain structural units of the formula (I)... Ni2+ and/or Zn2+ ions and at least one further metal ion Me
Implementation Method 2
these products can be reacted further, for example with melamine or melamine derivatives, in order to improve the performance properties of the pigments
Data Source
AI summary
The novel yellow metal azo pigments based on at least three metal azo compounds which differ at least in the type of metal have improved color strengths and are of excellent suitability for pigmentation of pigment preparations for a broad field of use.