Sterically hindered aliphatic polyamine cross-linking agents, compositions containing them and uses thereof
AssigneeConnora Technologies, Inc.
InventorStefan J. Pastine
Life of this patent
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Abstract
The present disclosure relates, in part, to an epoxy resin composition comprising: an epoxy resin; and an aliphatic polyamine (e.g., as a cross-linking agent), wherein the aliphatic polyamine comprises a compound having the structure of Formula (1): wherein each of R1 and R2 is independently selected from the group consisting of hydrogen, alkyl group, cycloalkyl group and aromatic group; or R1 and R2 together with the carbon atom to which they are attached form a cyclic ring; each of R3 and R4 is independently selected from the group consisting of hydrogen, alkyl group, cycloalkyl group and aromatic group.
Claims23
An epoxy resin composition comprising:
- an epoxy resin;
- and
- an aliphatic polyamine, wherein the aliphatic polyamine comprises a compound having the structure of Formula (1):
- wherein:
- each of R1 and R2 is independently selected from the group consisting of hydrogen, alkyl group, cycloalkyl group and aromatic group;
- or
- R1 and R2 together with the carbon atom to which they are attached form a cyclic ring;
- each of R3 and R4 is independently selected from the group consisting of hydrogen, alkyl group, cycloalkyl group and aromatic group;
- or
- R3 and R4 together with the carbon atom to which they are attached form a cyclic ring;
- each Ra and Rb is independently selected from the group consisting of alkyl group, cycloalkyl group and aromatic group;
- and
- each m and n is independently an integer ranging from 0 to 20;
- and
- wherein the epoxy resin composition has working time of at least 5 hours.
A method of altering the working time of a curable epoxy resin composition to compensate for ambient temperatures comprising:
- forming a stable resin blend including a cross-linkable epoxy resin;
- selecting a cross-linking agent for the epoxy resin from the group consisting of a polyamine cross-linking agent comprising a compound having Formula (1):
- wherein:
- each of R1 and R2 is independently selected from the group consisting of hydrogen, alkyl group, cycloalkyl group and aromatic group;
- or R1 and R2 together with the carbon atom to which they are attached form a cycloalkyl group;
- each of R3 and R4 is independently selected from the group consisting of hydrogen, alkyl group, cycloalkyl group and aromatic group;
- or
- R3 and R4 together with the carbon atom to which they are attached form a cyclic ring;
- each Ra and Rb is independently selected from the group consisting of alkyl group, cycloalkyl group and aromatic group;
- and
- each m and n is independently an integer ranging from 0 to 20;
- and
- wherein the selection is made such that a mixture of the cross-linking agent and the epoxy resin has a long working time at or near ambient temperatures.
Dependencies are inferred from the claim text.