Anthranilate Polymer Viscosity Modifiers for Coatings
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Solution Overview
Problem
There is a growing need for thickeners that enhance the rheological behavior of water-borne coating compositions, particularly in terms of flowability, levelling, and gloss, while maintaining suitable viscosities over a wide range of shear rates, which existing associative thickeners do not adequately address.
Innovation Solution
A polymer composition is developed by reacting a polymer with at least one pending anthranilate or anthranilamide moiety with a C4-C24-alk(en)ylated succinic anhydride, which acts as a viscosity modifier and thickener, and can be tailored for specific applications by adjusting the number of anthranilate and/or anthranilamide moieties and modifying the polymer backbone or succinic anhydride structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing associative thickeners are used, then viscosity modification is achieved, but rheological behavior and application properties (flowability, levelling, gloss) are not sufficiently enhanced
Solution Approach 1:
The invention uses composite polymer structures combining hydrophilic blocks (for water solubility) with hydrophobic modified sections (for associative thickening). This composite architecture enables simultaneous achievement of stable viscosity modification and enhanced rheological behavior, resolving the contradiction between reliability and adaptability of application properties.
Solution Approach 2:
The patent modifies key parameters of associative thickeners including the degree of hydrophobic modification, block length ratios, and chemical composition of hydrophobic groups. By optimizing these parameters, the invention achieves both reliable viscosity control and superior application properties such as improved flowability, levelling, and gloss.
2Ease of operation
If viscosity is increased to improve coating properties, then flowability and levelling improve, but viscosity control over a wide range of shear rates becomes difficult
Solution Approach 1:
The invention employs dynamic associative thickener molecules that can adjust their conformation and association state in response to shear rate changes. At low shear rates, extended conformations provide high viscosity for flowability; at high shear rates, collapsed conformations maintain appropriate viscosity control, enabling operation across a wide shear rate range.
3Stability of the object's composition
If polymer concentration is increased to maintain viscosity levels, then viscosity stability improves, but processing complexity and formulation difficulty increase
Solution Approach 1:
The invention optimizes the molecular weight, block composition, and hydrophobic modification degree of associative thickeners to achieve maximum viscosity stability at low concentrations. This parameter optimization reduces the required thickener concentration while maintaining stable viscosity, thereby simplifying formulation processes and reducing complexity.
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 polymer composition improves the rheological behavior of water-borne coating compositions, resulting in better flowability, reduced spattering and sagging, and enhanced gloss, while maintaining viscosity levels across a broad range of shear rates, making it suitable for various coating applications.
Implementation Method 1
a non-ionic hydrophobically modified water-soluble polymer capable of interacting in aqueous solution with itself and with other species such as dispersed-phase particles of an aqueous dispersion
Implementation Method 2
Thickeners increase and maintain viscosity at required levels under specified processing conditions and end use situations
Data Source
AI summary
The present invention relates to novel polymer compositions, to a process for their manufacturing, to the use of said polymer compositions for modifying the viscosity of aqueous compositions, and to water-borne coating compositions containing the novel polymer compositions as thickeners. The polymer compositions comprise a polymer material which is obtainable by reacting: a) a polymer P1 having at least one functional group of the formula (I), where k is an integer from 0 to 4; n is 0 or 1 p is an integer from 1 to 10, the number average of p being from 1.5 to 10; Q is a divalent moiety selected from the group consisting of —O— and —NH—; P is a p-valent hydrophilic neutral polymer radical; and R1 is as defined in the claims; with b) a succinic anhydride of the formula (II) where R is C4-C24-alkyl or C4-C24-alkenyl.