Room temperature ionic liquid curing agent
AssigneeEvonik Operations GmbH
InventorsJian Li, Lei Wang
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Abstract
Epoxy curing agents are disclosed having an epoxy curing agent comprising at least one room temperature ionic liquid salt, the room temperature ionic liquid salt being a reaction product of (a) at least one polyalkylene polyamine compound represented by formula (I): wherein x, y, and z are integers of 2 and 3, m and n and integers of 1-3; and (b) an organic acid having pKa (the negative of the logarithm of the acid dissociation constant) less than 6. The liquid salt is a stable liquid at a temperature greater than 15° C. Curable epoxy-based compositions including the curing agent and articles formed by the curable epoxy-based compositions are also disclosed.
Claims19
An epoxy curing agent comprising at least one room temperature ionic liquid salt, the room temperature ionic liquid salt being a reaction product of:
- (a) at least one polyalkylene polyamine compound represented by formula (I):
- wherein x, y, and z are integers of 2 and 3, m and n are integers of 1-3;
- and
- (b) an organic acid having pka less than 6;
- wherein the at least one polyalkylene polyamine compound comprises a mixture of dissimilar polyalkylene polyamine compounds selected from the group consisting of N,N′-bis(3-aminopropyl)ethylenediamine and N,N,N′-tris(3-aminopropyl)ethylenediamine, wherein the at least one polyalkylene polyamine compound further comprises a derivative of polyalkylene polyamine, wherein the derivative of polyalkylene polyamine is one or more compounds selected from alkylated polyalkylene polyamine, benzylated polyalkylene polyamine, hydroxyalkylated polyalkylene polyamine, and polyalkylene polyamine adduct, and wherein the reaction of the reaction product proceeds at a reaction temperature of 65° C. to 110° C. for 3 to 7 hours.
A curable epoxy-based composition comprising:
- (i) at least one epoxy resin;
- and
- (ii) an epoxy curing agent comprising at least one room temperature ionic liquid salt, the room temperature ionic liquid salt being a reaction product of:
- (a) at least one polyalkylene polyamine compound represented by formula (I):
- wherein x, y, and z are integers of 2 and 3, m and n are integers of 1-3;
- and
- (b) an organic acid having pKa less than 6;
- wherein the at least one polyalkylene polyamine compound comprises a mixture of dissimilar polyalkylene polyamine compounds selected from the group consisting of N,N′-bis(3-aminopropyl)ethylenediamine and N,N,N′-tris(3-aminopropyl)ethylenediamine, wherein the at least one polyalkylene polyamine compound further comprises a derivative of polyalkylene polyamine, wherein the derivative of polyalkylene polyamine is one or more compounds selected from alkylated polyalkylene polyamine, benzylated polyalkylene polyamine, hydroxyalkylated polyalkylene polyamine, and polyalkylene polyamine adduct, and wherein the reaction of the reaction product proceeds at a reaction temperature of 65° C. to 110° C. for 3 to 7 hours.
An epoxy curing agent comprising at least one room temperature ionic liquid salt, the room temperature ionic liquid salt being a reaction product of:
- (a) at least one polyalkylene polyamine compound represented by formula (I):
- wherein x, y, and z are integers of 2 and 3, m and n are integers of 1-3;
- and
- (b) an organic acid having pKa less than 6;
- wherein the at least one polyalkylene polyamine compound comprises a mixture of dissimilar polyalkylene polyamine compounds selected from the group consisting of N,N′-bis(3-aminopropyl)ethylenediamine and N,N,N′-tris(3-aminopropyl)ethylenediamine, and wherein the reaction of the reaction product proceeds at a reaction temperature of 65° C. to 110° C. for 3 to 7 hours.
Dependencies are inferred from the claim text.