Mannich condensates as epoxy curing agents
AssigneeTexaco Inc.
InventorsHarold G. Waddill, George P. Speranza
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Abstract
Mannich condensates prepared from an imidazole, formaldehyde and a polyalkylene polyamine are useful as curing agents for epoxy resins. Preferably, a diamine is reacted with the imidazole and formaldehyde, as illustrated by the following formula: ##STR1## wherein: R represents hydrogen or a C.sub.1 -C.sub.4 alkyl group; At least one of R' and R" represents hydrogen and the other represents hydrogen or methyl; n represents a number having an average value of 0 to about 100; Q represents --O-- or --NH--; and Z represent H or ##STR2##
Claims5
In a method for curing a 1,2-epoxy resin wherein an effective amount of an amine curing agent is intimately mixed with the 1,2-epoxy resin under epoxy resin curing conditions, the improvement which comprises using, as the curing agent a Mannich condensate of Formula IV or VI ##STR16## Wherein Q represents --O-- or --NH--,
- n represents a number having an average value of 0 to about 100,
- R represents H or a C.sub.1 to C.sub.4 alkyl group, at least one of R' and R" represents hydrogen and the other represents hydrogen or methyl, and
- Z represents H or an imidazolyl-methylene group having the formula:
- ##STR17## Wherein:
- A represents a trifunctional initiator,
- x, y and z represent numbers, and the sum of x+y+z=4 to about 100.
Dependencies are inferred from the claim text.