Loading patent…
AssigneeMinnesota Mining and Manufacturing Company
InventorsSteven M. Heilmann, Dean M. Moren, Jerald K. Rasmussen, Larry R. Krepski, Sadanand V. Pathre
Estimating the term…
This invention provides novel azlactone-functional oligomers of 2-alkenyl azlactones in which oligomerization has occurred predominantly via the 2-alkenyl group. Oligomerization of the 2-alkenyl group provides oligomers having 2 to 15 mer units with predominantly carbon-carbon backbone segments. Oligomerized in this fashion, the novel compositions possess azlactone groups which can be reacted with nucleophiles in the normal ring-opening sense. The oligomers are prepared by a novel process in which both Lewis and Bronsted acidic catalysts are effective. The reactive oligomers find utility as crosslinking agents for polymers containing azlactone-reactable nucleophilic groups.
An azlactone-functional oligomer of a 2-alkenyl-4,4-disubstituted azlactone having 2 to 15 units of which at least 30 mole percent are 2-alkenyl group polymerized units.
An oligomer having the formula ##STR22## wherein Ax is the group ##STR23## wherein R.sup.1 and R.sup.2 independently represent an alkyl group of 1 to 14 carbon atoms, a cycloalkyl group of 3 to 12 carbon atoms, an aryl group of 5 to 12 ring atoms, or R.sup.1 and R.sup.2 taken together with the carbon atom to which they are joined form a carbocyclic ring of 4 to 12 ring atoms;
Dependencies are inferred from the claim text.