Coating Composition Using Oligomeric Macromonomer for Crosslinking Density
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Solution Overview
Problem
Current coating compositions in industries such as automotive OEM lack improved properties, with a need for enhanced film-forming components that offer better crosslinking density and reduced viscosity, while also being environmentally friendly.
Innovation Solution
A coating composition comprising a polymer with an oligomeric macromonomer that undergoes free radical polymerization, featuring reactive functional groups and a core formed by extending from the oligomeric macromonomer, which has an average functionality ranging from 1.0 to 30.0, allowing for controlled crosslinking density and reduced curing agent usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional polymers are used as film-forming components in coating compositions, then the coating system provides basic protective and aesthetic functions, but the crosslinking density is insufficient and viscosity remains high
Solution Approach 1:
The polymer is segmented into distinct functional regions: a core formed by difunctional monomers and oligomeric macromonomers extending from the core. This segmentation allows the core to provide structural integrity and controlled crosslinking while the oligomeric macromonomers contribute reactive functional groups, resolving the contradiction between achieving high crosslinking density and maintaining manageable structural complexity
Solution Approach 2:
The invention creates a composite polymer structure combining difunctional ethylenically unsaturated monomers (forming the core) with oligomeric macromonomers (extending from the core). This composite architecture enables simultaneous achievement of high crosslinking density through the difunctional monomers and controlled viscosity through the oligomeric macromonomer's flexible chain structure
2Quantity of substance
If conventional polymers are used in coating compositions, then the formulation is straightforward, but the viscosity is high and requires more curing agent
Solution Approach 1:
The invention changes the functional parameters of the polymer by incorporating oligomeric macromonomers with specific functionality ranges (1.0 to 30.0) and using difunctional monomers with controlled double bond configurations. These parameter changes enable reduced curing agent usage (1.0 to 2.0 equivalents) while maintaining manageable polymerization processes through free radical mechanisms
Solution Approach 2:
The oligomeric macromonomer acts as an intermediary between the core polymer structure and the curing agent. Its oligomeric nature provides multiple reactive functional groups that efficiently utilize curing agents, reducing overall curing agent requirements while the macromonomer's structure facilitates controlled polymerization through its ethylenically unsaturated terminal group
3Object-affected harmful factors
If conventional coating compositions are used, then the formulation is simple, but environmental friendliness is compromised due to transition metals and solvents
Solution Approach 1:
The invention replaces transition metal-based polymerization catalysts with free radical polymerization mechanisms. This substitution eliminates the need for environmentally harmful transition metals while achieving the same polymerization function through radical initiators, thereby reducing environmental impact without significantly increasing process complexity
Solution Approach 2:
The invention changes the chemical parameters of the polymerization system by using ethylenically unsaturated monomers and macromonomers that polymerize via free radical mechanisms. This parameter change eliminates transition metal catalysts and associated solvents, improving environmental friendliness while maintaining controlled polymerization through well-understood radical chemistry
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 composition achieves improved crosslinking density and lower viscosity, providing enhanced coating properties with reduced curing agent requirements, while being environmentally friendly due to the absence of transition metals and solvents in the polymerization process.
Implementation Method 1
a core from which the oligomeric macromonomer extends formed by free medical polymerization of the oligomeric macromonomer with a monomer comprising at least two ethylenically insaturated double bonds
Data Source
AI summary
The present invention is directed to a coating composition comprising a polymer that comprises an oligomeric macromonomer and a core from which the oligomeric macromonomer extends, wherein the oligomeric macromonomer comprises reactive functional groups and has an average functionality ranging from 1.0 to 30, and wherein the core is < 10 weight % of the total polymer weight.