Curing of polyglycidyl ether resins

A compound selected from the group consisting of ##STR13## where R is a hydrocarbon radical of from 1 to 30 carbon atoms and where m is a number from 2 to 6 and ##STR14## where R' is a hydrocarbon moiety selected from the group consisting of dimers, trimers, oligomers, polymers and copolymers having an average molecular weight of from about 250 to 5000 and which may contain a minor amount by weight of --C.tbd.N groups and where n is a number from 2 to 10 and where R" is hydrogen or methyl and mixtures of such compounds.

Biscyanoethyl carbohydrazide.

A curable composition comprising

• (I.) at least one polyglycidyl ether resin having an average of at least two glycidyl ether groups, an epoxide equivalent of from about 130 to 6000 and a molecular weight of from about 300 to 12,000 and
• (II.) at least one hydrazide compound selected from group consisting of ##STR15## where R is a hydrocarbon radical of from 1 to 30 carbon atoms and where m is a number from 2 to 6 and ##STR16## where R' is a hydrocarbon moiety selected from the group consisting of dimers, trimers, oligomers, polymers and copolymers having an average molecular weight of from about 250 to 5000 and which may contain a minor amount by weight of --C.tbd.N groups and where n is a number from 2 to 10 and where R" is hydrogen or methyl, the equivalent ratio of epoxy ##STR17## of (I.) to amine (--NH--) of (II.) being from about 1:1 to 12:1, or from about 1:1 to 6:1.

The method which comprises mixing and heating at a temperature of from about 100.degree. to 165.degree. C., or from about 120.degree. 150.degree. C., for a period of time sufficient to cause curing of

• (I.) at least one polyglycidyl ether resin having an average of at least two glycidyl ether groups, an epoxide equivalent of from about 130 to 6000 and a molecular weight of from about 300 to 12,000 and
• (II.) at least one hydrazide compound selected from group consisting of ##STR18## where R is a hydrocarbon radical of from 1 to 30 carbon atoms and where m is a number from 2 to 6 and ##STR19## where R' is a hydrocarbon moiety selected from the group consisting of dimers, trimers, oligomers, polymers and copolymers having an average molecular weight of from about 250 to 5000 and which may contain a minor amount by weight of --C.tbd.N groups and where n is a number from 2 to 10 and where R" is hydrogen or methyl, the equivalent ratio of epoxy ##STR20## of (I.) to amine (--NH--) of (II.) being about 1:1 to 12:1, or from about 1:1 to 6:1.