Oligomers from multifunctional acrylates
View Patent ↗Oligomers from multifunctional acrylates and organonitro compounds are provided. Films obtained from crosslinked oligomers of the present invention are useful as protective or decorative coatings as well as components in adhesives and composites.
1. A Michael addition reaction product of a multifunctional acrylate and organonitro compound.
2. The reaction product of claim 1 , wherein the organonitro compound is a functionalized nitro compound.
3. The reaction product of claim 1 , wherein the organonitro compound is a nitroalkane.
4. The reaction product of claim 3 , wherein the nitroalkane has 1 to 18 carbon atoms.
5. The reaction product of claim 3 , wherein the nitroalkane has 1-4 carbon atoms.
6. The reaction product of claim 3 , wherein the nitroalkane comprises nitromethane or nitroethane.
7. The reaction product of claim 1 , wherein the multifunctional acrylate is a diacrylate, triacrylate or tetraacrylate.
8. The reaction product of claim 1 , wherein the multifunctional acrylate is selected from the group consisting of diethylene glycol diacrylate, ethoxylated bisphenol A diacrylate, 1,6-hexanediol diacrylate, neopentyl glycol diacrylate, polyethylene glycol diacrylate, propoxylated neopentyl glycol diacrylate, tetraethylene glycol diacrylate, triethylene glycol diacrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated glyceryl triacrylate, tris(2-hydroxyethyl) isocyanurate triacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, acrylated epoxy resins, urethane acrylates and acrylated polyesters.
9. The reaction product of claim 1 , wherein the acrylate comprises hexanediol diacrylate or trimethylol propane triacrylate.
10. The reaction product of claim 5 , wherein the acrylate comprises hexanediol diacrylate or trimethylol propane triacrylate.
11. The reaction of claim 1 , wherein the multifunctional acrylate is employed in excess of its stoichiometric amount and the product is a non-crosslinked liquid oligomer.
12. The reaction of claim 1 , wherein the equivalent ratio of the multifunctional acrylate to organonitro compound is greater than 1.
13. A method for producing the reaction product of claim 1 , which comprises of reacting the acrylate and nitroorganic compound in the presence of a strong base catalyst.
14. The method of claim 13 , wherein the base is a cyclic amidine, quarternary amine hydroxides or alkali metal alkoxides or hydroxides.
15. The method of claim 13 , wherein the base comprises DBU, DBN or a guanidine.
16. The reaction product of claim 1 , wherein further includes an acetoacetate.
17. The reaction product of claim 16 , wherein the amount of acetoacetate is about 2 to about 20 wt. %.
18. A photo-curable composition comprising the reaction product of claim 1 and a photoinitiator.
19. A method for producing a coated substrate which comprises applying the reaction product of claim 1 to a substrate and curing the reaction product.
20. A method for producing a coated substrate which comprises applying the composition of claim 18 and curing the composition.
21. The method of claim 20 which comprises curing the composition by UV radiation.