Patent ID: 8735526

Claim:
A method of making a polymer wherein the polymer is made by performing a reaction in a mixture comprising: 1) an imine selected from polyaldimines, hydroxyaldimines, polyketimines, and hydroxyketimines; wherein the polyaldimine is made by reacting ethylene diamine, 2-methyl-1,5-pentylene diamine, or a polyoxyalkyleneamine with an aldehyde; wherein the hydroxyaldimine is made by reacting diglycol amine with an aldehyde; 2) a polyisocyanate; and 3) a hydroxyl compound, if the imine is not a hydroxyimine; wherein the hydroxyl compound is an alcohol, a glycol, or a polyol; wherein the polymer comprises urea linkages formed from the imine and polyisocyanate; wherein the polymer comprises urethane linkages formed from the hydroxyl group of the hydroxyimine or the hydroxyl compound and the polyisocyanate; wherein the reaction is performed in the absence of solvent; wherein the reaction forms a crosslinked coating; and wherein the molar ratio of urea linkages to urethane linkages is at least 2:1.