Amine-Modified Polyacrylate Viscosity Control
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Solution Overview
Problem
Post-modification of polymers to enhance dispersant properties in ink and coating compositions is hindered by difficulties in controlling polymer analogous reactions, leading to incomplete reactions, unwanted side products, and challenges in purification, resulting in unpredictable and costly outcomes.
Innovation Solution
The use of controlled free radical polymerization followed by transamidization of polyacrylate polymers with specific nitroxylether and stable free nitroxyl radicals, and subsequent modification with alcohols and amines to produce amine-modified polymers that improve viscosity without compromising polymer structure or pigment properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If post-modification reactions are used to enhance dispersant properties, then viscosity parameters are improved, but polymer structure definition is lost due to chain scission and cross coupling
Solution Approach 1:
The patent performs the polymerization reaction first to create a well-defined polyacrylate backbone with controlled molecular weight and narrow distribution, then subsequently introduces amine groups through controlled reaction with diamines. This preliminary establishment of structural integrity before functional modification prevents chain scission and cross-coupling that would occur if modification attempts were made on poorly defined polymers.
Solution Approach 2:
The patent uses alcohol intermediates as a bridge between the polyacrylate polymer and the final amine-modified product. The polyacrylate first undergoes transesterification with alcohol to create hydroxyl-functionalized intermediates, which then react with diamines to introduce the dispersant functionality. This two-step intermediary approach allows controlled modification without direct harsh conditions that would cause polymer degradation.
2Productivity
If drastic reaction conditions are used to complete post-modification reactions, then reaction completion is achieved, but polymer structure is degraded through chain scission and cross coupling
Solution Approach 1:
The patent employs continuous controlled free radical polymerization using nitroxide mediation that maintains steady-state radical concentrations throughout the reaction. This continuous controlled action allows the polymerization to proceed to high conversion without sudden bursts of reactivity that would cause chain scission, achieving both completeness and structural integrity.
Solution Approach 2:
The patent carefully controls reaction parameters including temperature, monomer-to-initiator ratio, and nitroxide mediator concentration to optimize the balance between reaction rate and polymer stability. By adjusting these parameters, the system achieves complete conversion while maintaining narrow molecular weight distribution and preventing cross-coupling side reactions.
3Adaptability or versatility
If traditional polymer analogous reactions are used for post-modification, then chemical functionality is introduced, but purification becomes difficult and costly
Solution Approach 1:
The patent introduces removable protecting groups and uses extraction techniques to separate the desired amine-modified polymer from unreacted starting materials and side products. The controlled structure allows selective extraction of impurities while retaining the functional polymer, making purification more straightforward compared to traditional approaches.
Solution Approach 2:
The patent produces polymers with homogeneous structure and narrow molecular weight distribution through controlled polymerization, which simplifies subsequent purification. The uniform polymer chains have consistent properties that make separation from impurities easier, reducing the complexity and cost of purification steps compared to dealing with polydisperse, structurally varied polymers.
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
This approach yields amine-modified polymers that enhance dispersant properties, such as viscosity, while maintaining the stability and functionality of the polymer structure, thus addressing the limitations of traditional post-modification methods.
Implementation Method 1
The controlled free radical polymerisation (CFRP) is a tool to tailor the microstructure of polymers
Implementation Method 2
pigment is typically dispersed in a finely divided form to ensure uniformity of colour
Implementation Method 3
the post-modification, particularly the transamidization, of polyacrylate polymers yields amine-modified polymers
Data Source
AI summary
The presently claimed invention relates to an amine-modified polymer and method for preparation thereof. The presently claimed invention is also directed to the use of the polymer as dispersant in ink and coating compositions. Polyacrylate polymer is obtained by controlled free radical polymerization of a mixture comprising at least one acrylate monomer. The post-modification of polyacrylate polymers yields amine-modified polymers that provide improved viscosity parameters, without sacrificing the advantages of a well-defined polymer structure.