Polyester Polyols for Water-Resistant Polyurethane Coatings
This problem can be countered through a range of hydrolytically stable polyester polyols developed by Uniqema, based on dimerized fatty acids.
Starting from the C18 acids that nature typically provides, the dimer acid is a species with 36 carbon atoms, making it the longest dioic acid available. This hydrocarbon makes dimer acid and polymers in which it is included extremely hydrophobic. The combination of the hydrocarbon character and the non-crystallinity provides flexibility, even at very low temperatures, and lubricity.