Patent ID: 6573357
Filing Date: 2003-06-03
Classification: C08G,C08L

Abstract:
A method for the production of ketimines of the formula: having an unreacted polyamine content of less than 1% by weight, wherein R1 and R2 are selected from the group consisting of C1-C18 aliphatic, including the branched isomers, C5-C10 cycloaliphatic, and C6-C12 aromatic radicals, R3 is a bivalent C1-C12 hydrocarbon and n is 0 to 6; which method comprises:a) contacting a ketone of the formula: wherein R1 and R2 are as defined above, with a polyamine of the formula H2N&Parenopenst;R3â€”NH&Parenclosest;nR3â€”NH2 wherein R3 is as defined above, at a temperature range of about 170Â° F. to about 230Â° F., wherein the weight ratio of ketone to amine is in the range of about 3.0:1 to 10:1, to form a reaction mixture having an excess of ketone reactant; b) removing a water by-product produced in the reaction mixture; c) removing the excess of ketone reactant from the reaction mixture; d) recycling a portion of the excess of ketone reactant to the reaction mixture; and e) recovering a ketimine product.