Patent ID: 6359037
Filing Date: 2002-03-19
Classification: C08G

Abstract:
An aqueous curable epoxy resin system comprising:(a) water, (b) at least one epoxy resin; and (c) a curing agent comprising a reaction product having an amine equivalent weight of at least 50 prepared by the steps comprising (i) reacting (A) an epoxy-functional compound prepared by reacting an amidoamine having the formula: â€ƒwherein R1 is an alkyl, aryl, or arylalkyl group having 1 to 15 carbon atoms, R2 is aliphatic, cycloaliphatic, or aromatic group having 2 to 18 carbon atoms optionally containing non-reactive oxygen or at most an average of 4 secondary and/or tertiary nitrogen atoms per structure in the backbone, X and Y are independently a hydrogen, methyl or ethyl group with the provision that X or Y is hydrogen, then the other of X or Y is methyl or ethyl and n+m+o is a real number from 65 to 200, and n, m, and o are each a real number such as to provide a number average molecular weight of the amidoamine from 3000 to 10,000, and n+o is within the range of from 80 percent to 100 percent of n+m+o, in a ratio of (I) to (II) by weight in the range of 100:0 to 0:100, in a ratio of (I) to (III) by weight in the range of 100:0 to 0:100, and in a ratio of (II) to (III) by weight in the range of 100:0 to 0:100, and at least one epoxy resin having a functionality of from 1.5 to 2.5 epoxide group per molecule in an active amine hydrogen atoms to epoxy groups ratio of from 1:350 to 1:15, said epoxy resin is a glycidyl ether containing aliphatic, cycloaliphatic, or aromatic moieties, and (B) at least one polyamine in an active amine hydrogen atoms to epoxy groups ratio of 2:1 to 30:1 thereby producing an amine-terminated product having a amine equivalent weight of at least 50; and (ii) reacting the amine-terminated product with (C) a monoepoxy in a remaining active amine hydrogen atoms to epoxy groups ratio of 5:1 to 20:1.