Comb Copolymers with Imide Linkages for Hydrolysis Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing comb copolymers based on styrene/maleic anhydride copolymers lack hydrolysis resistance and effective wetting and dispersing properties, making them unsuitable for various applications, particularly in pigment pastes and coatings.
Innovation Solution
The development of comb (block) copolymers produced by reacting styrene/maleic anhydride units with polyalkylene oxide monoamines at elevated temperatures, followed by salification of free carboxyl groups at lower temperatures, resulting in polymers with imide structures that enhance hydrolysis resistance and dispersing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If comb copolymers are produced by reacting styrene/maleic anhydride copolymers with polyalkylene oxide amines and polyalkylene oxide glycols, then wetting and dispersing properties are improved, but hydrolysis resistance deteriorates due to the formation of amide and ester linkages
Solution Approach 1:
The patent changes the chemical structure parameter by forming imide linkages instead of amide and ester linkages. This structural parameter change provides both hydrolysis resistance and stability without the drawbacks of previous approaches
Solution Approach 2:
The patent creates a composite structure with imide linkages combining the benefits of both amide and ester linkages while eliminating their hydrolysis vulnerability, achieving superior performance through structural composition
2Ease of manufacture
If comb copolymers contain only amide and ester linkages of side chains to main chain, then manufacturing is simplified, but hydrolysis resistance and wetting performance deteriorate
Solution Approach 1:
The patent modifies the chemical linkage parameter from amide/ester to imide structure, achieving both ease of manufacture through direct reaction and superior hydrolysis resistance through the stable imide bond structure
3Reliability
If comb copolymers are designed with linear polyalkylene oxide side chains, then wetting and dispersing effects are improved, but hydrolysis stability deteriorates without imide structures
Solution Approach 1:
The patent creates a composite molecular structure where linear polyalkylene oxide side chains provide wetting and dispersing effects while imide linkages provide hydrolysis stability, achieving both desired properties simultaneously
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 comb copolymers exhibit improved wetting and dispersing effects, making them suitable for a wide range of applications, including pigment dispersions and coatings, with enhanced hydrolysis resistance and performance in various industrial and cosmetic products.
Implementation Method 1
reacting I at least one (block) copolymer comprising polymerised, optionally substituted styrene and maleic anhydride units with II at least one polyalkylene oxide monoamine comprising a primary amino end group at a reaction temperature of ≧150° C.
Implementation Method 2
subsequent salification of at least 25 mol % of the free carboxyl groups of the reaction product at a reaction temperature of 2O
Data Source
AI summary
The present invention relates to comb (block) copolymers obtainable by reactingI at least one (block) copolymer comprising polymerized, optionally substituted styrene and maleic anhydride units, which copolymer has been obtained by living, free-radical polymerization, withII at least one polyalkylene oxide monoamine comprising a primary amino end group at a reaction temperature of ≧150° C.and by subsequent salification of at least 25 mol % of the free carboxyl groups of the reaction product at a reaction temperature of <100° C. and optionally after addition of H2O and to the use of these comb copolymers as wetting agents and dispersants.