Anthranilate Polymer Dispersants for Pigment Stability
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Solution Overview
Problem
There is a growing need for dispersants with improved pigment affinity and rheology behavior, particularly in high solids content applications, to stabilize solid fine particles and enhance the properties of surface coatings such as gloss and viscosity.
Innovation Solution
Polymers with anthranilate or anthranilamide groups attached to their termini or backbone, which act as dispersants by physically binding to solid particles and creating a steric environment to prevent coagulation and improve dispersion stability, are used in liquid compositions containing solid fine particles like pigments and fillers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dispersants are used in high solids content applications, then pigment dispersion stability deteriorates, but increasing dispersant concentration increases viscosity and reduces application performance
Solution Approach 1:
The patent changes the chemical structure parameters of the dispersant by introducing anthranilate and anthranilamide groups with specific molecular weight ranges (500-50,000 Da). These structural modifications enable effective dispersion at lower concentrations, resolving the contradiction between dispersion stability and viscosity increase.
Solution Approach 2:
The dispersant combines multiple functional groups (anthranilate, anthranilamide, and polyether chains) into a composite molecular structure. This composite structure provides both strong pigment binding capability and adequate steric stabilization, achieving effective dispersion without requiring high dispersant concentrations that would increase viscosity.
2Reliability
If dispersant concentration is increased to improve pigment affinity and stabilization, then dispersion stability improves, but rheology behavior deteriorates due to excessive viscosity
Solution Approach 1:
The patent optimizes molecular weight parameters (500-50,000 Da) and functional group composition to achieve effective pigment stabilization at low concentrations. The specific parameter range ensures adequate steric barrier without excessive viscosity, maintaining good rheology behavior.
3Productivity
If high solids content is used to improve efficiency and reduce environmental impact, then application performance improves, but particle coagulation and settling increase
Solution Approach 1:
The dispersant's composite structure with anthranilate/anthranilamide groups and polyether chains provides dual functionality: strong binding to pigment surfaces and adequate steric stabilization. This enables high solids content formulations to remain stable without excessive coagulation or settling.
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
These polymers effectively stabilize solid particles at high solids content, enhance rheology, and improve the gloss of coatings, making them suitable for various applications including coatings, inks, and industrial paints.
Implementation Method 1
They act as stabilizers for the solid fine particulate materials, i.e. the dispersant separates the particles of the solid fine particulate material and thus prevents them from coagulation or clumping
Implementation Method 2
they act as stabilizers for the solid fine particulate materials, i.e. the dispersant separates the particles and thus prevents them from coagulation or clumping and settling from the liquid phase
Data Source
AI summary
The present invention relates to novel polymer dispersants and to a liquid compositions containing solid fine particles, such as organic or inorganic pigments and fillers, and the polymer dispersants. The polymer dispersants have at least one functional moiety of the formula I, which is bound to one of the termini or to the backbone of the polymer: (I) where # indicates the point of attachment to the terminus and/or to the polymer backbone; k is 0, 1, 2, 3 or 4, m is 0, 1, 2, 3, 4, 5, 6, 7, 8 or 9, A is a chemical bond or a divalent moiety selected from the group consisting of C1-C6 alkylene, -O-(C2-C6 alkylene), -C(=O-O-(C2-C6 alkylene), -N R3-(C2-C6 alkylene) and C(=O)-NR3-(C2-C6 alkylene), where the C2-C6 alkylene part is attached to Q; Q is a divalent moiety selected from the group consisting of -O-, -N H- and -S-; R1 is independently selected from the group consisting of -OH, -COOH, -COOCH3, -NH2, -NH( C1-C6 alkyl), -N(C1-C6 alkyl)2, -NO2, -S(=O)2R4, C1-C20 alkyl, C1-C4 alkoxy, halogen, aryloxy, aryl, heteroaryl; R2 is selected from the group consisting of hydrogen, -S(=O)2R4, C1-C20 alkyl, C3-C10 cycloalkyl, aryl, heteroaryl, aryl-C1-C4-alkyl and heteroaryl-C1-C4- alkyl; R3 is selected from the group consisting of hydrogen, -S(=O)2R4, C1-C20 alkyl, C3-C10 cycloalkyl, aryl and heteroaryl; R4 is selected from the group consisting of OH, -NH2, -NH(C1-C6 alkyl), -N(C1- C6 alkyl)2, C1-C4 alkyl, C1-C4 alkoxy, aryl and heteroaryl.