Patent ID: 6136894
Filing Date: 2000-10-24
Classification: C08G,C08L,C09D

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 prepared by the steps comprising(i) reacting at least one polyamine of the formulaH.sub.2 N--R.sup.2 --NH.sub.2wherein R.sup.2 is an aliphatic, cycloaliphatic or aromatic group having from 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, and at least one epoxy resin having a functionality of at least 1.5 in an epoxy functionality equivalents to polyamine mole ratio of from 0.9:1 to 1:10, thereby producing an amine-terminated intermediate;(ii) reacting the amine-terminated intermediate with from 0.5 to 25 weight percent, based on the amine-terminated intermediate, of an acid-terminated polyalkyleneglycol-containing compound having the formula: ##STR11## wherein R.sup.1 is an alkyl, aryl, or arylalkyl group having 1 to 15 carbon atoms, X and Y are independently a hydrogen, methyl or ethyl group with the provision that if X is methyl or ethyl, Y is hydrogen, or if Y is methyl or ethyl, X is hydrogen, and n+m+o is a real number of from about 100 to about 200, and n+o is at least 70 percent of n+m+o, in a ratio of (I) to (II) by weight in the range of 100:0 to 0:100, 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, until essentially all of the acid group is consumed.