Monohydric polyfluorooxetane polymer and radiation curable coatings containing a monofunctional polyfluorooxetane polymer
View Patent ↗Monofunctional polyfluorooxetane oligomers and polymers are prepared by the cationic polymerization of fluorooxetane monomers with a monoalcohol. The fluorooxetane oligomers or polymers can be copolymerized with generally cyclic ethers. Alternatively, the polyfluorooxetane oligomer or polymer having a single hydroxyl end group can be functionalized with a variety of compounds so as to yield a functional end group such as an acrylate, a methacrylate, an allylic, an amine, etc., with the functionalized oligomer or polymer being suitable for use in radiation curable or thermal curable coating compositions. These functionalized polymers can be copolymerized and cured to provide improvements in wetting and surface properties that have previously been provided by migratory chemicals such as waxes and oils. The partially or fully fluorinated side groups of the fluorooxetanes are believed to be disproportionately present at the interfaces between the coating and the substrate and between the coating and the atmosphere.
1. A process for forming a partially fluorinated functionalized oligomer or polymer comprising:
reacting a partially fluorinated monohydric polyoxetane containing alcohol, optionally including non-oxetane repeating units, either a) sequentially with a di or polyisocyanate forming an isocyanate terminated oligomer or polymer and then reacting said isocyanate terminated oligomer or polymer with a functionalizing compound forming a functionalized polyoxetane oligomer, or polymer or b) in a single step with an isocyanate functionalized compound and forming a functionalized polyoxetane oligomer or polymer.
2. A process according to claim 1 wherein said monohydric polyoxetane containing alcohol comprises repeating units of the formula
or combinations thereof, where n is the same or different and independently is an integer between 1 and 5, R is hydrogen or an alkyl of 1 to 6 carbon atoms, and each Rf is the same or different and independently on each repeat unit is a linear or branched fluorinated alkyl of 1 to 20 carbon atoms, a minimum of 75 percent of the non-carbon atoms of the alkyl being fluorine atoms and optionally the remaining non-carbon atoms being H, I, Cl, or Br; or each Rf is the same or different and independently is an oxaperfluorinated polyether having from 4 to 60 carbon atoms, and
wherein said functionalized group is an acrylate, a methacrylate, an allylic, a melamine, an amine, an acetylacetate, an epoxide, a silyl, or an isocyanate, or combinations thereof.
3. A process according to claim 2 , wherein said monohydric polyoxetane containing alcohol is reacted with a diisocyanate forming said isocyanate terminated polyoxetane oligomer or polymer which is then reacted with said functionalizing compound.
4. A process according to claim 1 , wherein said repeat group is said
5. A process for forming a partially fluorinated functionized oligomer or polymer comprising;
reacting a partially fluorinated polyoxetane containing monohydric alcohol, optionally including non-oxetane repeating units either a) sequentially with a di or polyepoxy compound forming an epoxy terminated oligomer or polymer and then reacting that epoxy terminated oligomer or polymer with a functionalizing compound forming functionalized polyoxetane oligomer or polymer, or b) in a single step reacting said monohydric alcohol with an epoxy functionalized compound and forming an functionized polyoxetane oligomer or polymer.
6. A process according to claim 5 , wherein said monohydric polyoxetane containing alcohol comprises repeating units of the formula
or combinations thereof, where n is the same or different and independently is an integer between 1 and 5, R is hydrogen or an alkyl of 1 to 6 carbon atoms, and each Rf is the same or different and independently on each repeat unit is a linear or branched fluorinated alkyl of 1 to 20 carbon atoms, a minimum of 75 percent of the non-carbon atoms of the alkyl being fluorine atoms and optionally the remaining non-carbon atoms being H, I, Cl, or Br; or each Rf is the same or different and independently is an oxaperfluorinated polyether having from 4 to 60 carbon atoms, and
wherein said functionalized group is an acrylate, a methacrylate, an allylic, a melamine, an amine, an acetylacetate, an epoxide, a silyl, or an isocyanate, or combinations thereof.
7. A process according to claim 6 , wherein said monohydric polyoxertane containing alcohol is reacted with a diepoxy forming said isocyanate terminated polyoxetane oligomer or polymer which is then reacted with said functionalizing compound.
8. A process according to claim 5 , wherein said repeat unit is said