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US 11,530,293 B2Granted
Polyamides and amidoamines derived from hydroxyalkylpolyamines: epoxy curing agents with improved properties
AssigneeEvonik Operations GmbH
InventorsGauri Sankar Lal, Sudhir Ananthachar, Stephen Michael Boyce
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Abstract
Polyamide and amidoamine curing agents comprising a selectively modified amine. The selectively modified amine is formed by a substitution reaction between a polyamine and an epoxide, resulting in a multifunctional amine having a hydroxyl substituent. The curing agents are used to form epoxy resins having improved properties when cured.
Claims16
A curing agent comprising the reaction product of
- (1) an amine component comprising at least one selectively modified multifunctional amine, and
- (2) a fatty acid component comprising a mixture of tall oil fatty acid derived dimer acid and tall oil fatty acid;
- wherein the at least one selectively modified multifunctional amine comprises a compound having a structural formula selected from the group consisting of:
- wherein the fatty acid component comprises at least one dimeric acid, at least one trimeric acid and at least one mono acid, wherein the dimeric acid comprises about 50 wt % to about 95 wt % of the fatty acid component, wherein the trimeric acid comprises about 3 wt % to about 40 wt % of the fatty acid component, and wherein the mono acid comprises less than 5 wt % of the fatty acid component;
- and wherein the curing agent has an imidazoline to amide ratio between about 2.3:1 and about 3.2:1.
2 more elements
A method for forming a curing agent, comprising:
- (i) reacting (1) at least one selectively modified multifunctional amine, with (2) a fatty acid component comprising a mixture of tall oil fatty acid derived dimer acid and tall oil fatty acid, wherein the at least one selectively modified multifunctional amine comprises a compound having a structural formula selected from the group consisting of:
- wherein the fatty acid component comprises at least one dimeric acid, at least one trimeric acid and at least one mono acid, wherein the dimeric acid comprises about 50 wt % to about 95 wt % of the fatty acid component, wherein the trimeric acid comprises about 3 wt % to about 40 wt % of the fatty acid component, and wherein the mono acid comprises less than 5 wt % of the fatty acid component;
- and wherein the curing agent has an imidazoline to amide ratio between about 2.3:1 and about 3.2:1.
Dependencies are inferred from the claim text.