Alkyd Polymer Composition for Low VOC Coatings
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Solution Overview
Problem
The coating industry faces challenges in developing low volatile organic compound (VOC) alkyd polymers that maintain performance and cost-effectiveness, particularly in field applications where substrates are not ideal and environmental curing conditions are less than optimal, as existing solutions either compromise on performance or require high-cost raw materials and lengthy processes.
Innovation Solution
An alkyd polymer composition comprising 15-75 wt.% fatty acids, 5-35 wt.% sugar alcohols, 2-10 wt.% polyols with four or more hydroxyl functional groups, and 5-25 wt.% aromatic polyacids with meta-positioned carboxylic acid groups, which exhibits a clear appearance and a dry-hard time of less than 10 hours, achieved through conventional polymerization techniques using environmentally friendly sugar alcohols and cost-effective raw materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If waterborne alkyd products are used to comply with VOC regulations, then environmental compliance is improved, but performance and applicability in field conditions deteriorate
Solution Approach 1:
The patent modifies the chemical composition parameters of the alkyd resin by incorporating specific polyols (sorbitol, mannitol, inositol) and controlling molecular weight distribution to achieve low viscosity. This allows the resin to perform well in both waterborne and solventborne formulations, maintaining coating performance while reducing VOC emissions. The specific parameter changes in resin composition enable the resin to adapt to different application environments.
Solution Approach 2:
The invention creates a composite resin system combining multiple polyol types (sugar alcohols like sorbitol and mannitol with conventional polyols) to achieve synergistic effects. This composite approach allows the resin to exhibit both the environmental benefits of waterborne systems and the performance characteristics of traditional solventborne alkyds, resolving the contradiction between VOC reduction and performance maintenance.
2Object-affected harmful factors
If exempt solvents are used to achieve VOC compliance, then environmental regulations are met, but cost and handling challenges increase due to odor, flash point, and solubility characteristics
Solution Approach 1:
The patent extracts and eliminates the need for problematic exempt solvents by developing a resin system that achieves low viscosity and proper performance through molecular structure design rather than solvent addition. The resin is formulated to work effectively with minimal or no exempt solvents, removing the source of odor, flash point, and solubility issues while maintaining VOC compliance.
Solution Approach 2:
The invention replaces expensive exempt solvents with a cost-effective resin formulation that achieves the desired performance through chemical composition rather than costly additive systems. The resin design allows for simpler, more economical manufacturing processes without relying on expensive solvent systems with problematic characteristics.
3Duration of action of stationary object
If molecular weight of alkyd resin is decreased or fatty acid amount is increased to lower viscosity, then viscosity is reduced, but coating performance deteriorates
Solution Approach 1:
The patent changes the molecular architecture parameters of the alkyd resin by incorporating specific polyol structures (sorbitol, mannitol, inositol) that create intramolecular hydrogen bonding and compact molecular configurations. This structural modification reduces viscosity without requiring decreases in molecular weight or increases in fatty acid content, thereby maintaining coating performance while achieving the desired flow characteristics.
4Duration of action of stationary object
If highly branched polymer structure or narrow molecular weight distribution is built to lower viscosity, then viscosity is reduced, but raw material cost and processing time increase significantly
Solution Approach 1:
The patent changes the chemical composition parameters by selecting specific polyol building blocks (sorbitol, mannitol, inositol) that naturally form compact, space-efficient molecular structures during polymerization. This composition-based approach achieves low viscosity through molecular architecture rather than requiring highly branched structures or narrow molecular weight distributions, thereby avoiding complex processing and high raw material costs while maintaining productivity.
Data Source
AI summary
An alkyd polymer composition for use in low volatile organic compound (VOC) containing products that exhibits a Gardner-Holdt viscosity with 30 weight % mineral spirits at 25° C. that is less than or equal to Z4, a thy-hard time of less than 10 hours when tested with metal driers according to ASTM D 1640-03, and a clear appearance. The alkyd polymer composition includes, as polymerized units an alkyd polymer of one or more fatty acids; a sugar alcohol having at least 6 carbon atoms; a polyol with four or more hydroxyl functional groups; and an aromatic polyacid with two carboxylic acid groups located in a meta-position relative to one another. The alkyd polymer composition includes at least one aliphatic oxide ring having one or more peaks located between 75 to 90 ppm as measured using C13 Nuclear Magnetic Resonance (NMR) spectroscopy.