Comb Copolymer Dispersants for Low Viscosity Paints
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Solution Overview
Problem
There is a need for novel polymers that can be used as dispersing agents to impart favorable properties such as low millbase viscosity, high gloss, and stability to let-down paints, as existing dispersants may not provide quantitative conversion of maleic anhydride-derived units and can contain unreacted cyclic anhydride units.
Innovation Solution
The polymerization of specific unsaturated compounds of formula (I) provides direct access to favorable dispersant agents, which upon use in let-down paints, lead to millbases with satisfactory rheological properties and high gloss and stability, involving a two-step process with polyalkyleneoxide and unsubstituted or substituted isatoic anhydride or anthranilic acid derivatives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If comb copolymers based on styrene and maleic anhydride are used as wetting and dispersing agents, then pigment dispersion is improved, but quantitative conversion of maleic anhydride-derived units is not achieved and unreacted cyclic anhydride units remain
Solution Approach 1:
The patent changes the chemical structure parameters by using maleic acid instead of maleic anhydride, and introduces a specific reaction sequence (reaction with amine, then reaction with carboxylic acid) to ensure complete conversion. This parameter change eliminates unreacted cyclic anhydride units while maintaining dispersant performance.
Solution Approach 2:
The patent employs preliminary action by first reacting the maleic acid-derived units with an amine to form an intermediate, and then reacting this intermediate with a carboxylic acid to form the final comb copolymer. This two-step preliminary process ensures complete conversion of the maleic acid units, avoiding the problem of unreacted cyclic anhydride units found in direct one-step methods.
2Reliability
If existing dispersants are used, then pigment dispersion is achieved, but millbase viscosity is not sufficiently reduced
Solution Approach 1:
The patent applies local quality by creating a comb copolymer structure with specific local characteristics: the backbone provides anchoring to pigment particles while the side chains (formed by the amine and carboxylic acid reaction) provide steric stabilization. This localized structural optimization reduces millbase viscosity while maintaining dispersant effectiveness.
3Reliability
If existing dispersants are used, then pigment dispersion is achieved, but gloss and stability of coatings are not sufficiently enhanced
Solution Approach 1:
The patent uses composite materials by combining the comb copolymer structure with specific functional groups (amine and carboxylic acid side chains) to create a dispersant that simultaneously provides pigment dispersion, reduces viscosity, and enhances coating gloss and stability. The composite structure allows multiple functions to be achieved together.
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 polymers effectively stabilize pigment dispersions, prevent coagulation, and enhance the gloss and stability of coatings, achieving low millbase viscosity and high gloss in paint formulations.
Implementation Method 1
Their side chains can interact with the dispersant phase to build up a steric environment to stabilize particle dispersion
Implementation Method 2
Dispersants can also be used to temporarily stabilize the pigment dispersion from re-aggregating and re-agglomerating
Implementation Method 3
Wetting agents facilitate bringing pigments into a dispersed state as a result of surface activity at the pigment-solution interface
Implementation Method 4
these agents reduce the formation of defects, known as craters, which are caused by impurities acting from the outside or by impurities on the surface of the substrate
Data Source
AI summary
The presently claimed invention relates to novel monomers which can be used for preparing polymers which are useful as dispersants for pigments and fillers, as wetting agent and as thickening agents in liquid compositions.