Process for the preparation of ketimine curing agents

摘要

The present invention relates to a process for the production of aliphatic ketimines having a polyalkylenepolyamine content of less than 1% by weight from the corresponding aliphatic ketones and polyalkylenepolyamines comprising the steps of: (a) forming a mixture of said aliphatic ketones and said polyalkylenepolyamines wherein the weight ratio of said ketone to said polyalkylenepolyamine is in the range of about 3.0:1 to about 10:1; (b) heating said mixture to a refluxing temperature between about 170° F. and 230° F. while continuously removing water to form the corresponding aliphatic ketimine; and (c) isolating said aliphatic ketimine.