Curing agent for epoxy resin coatings
AssigneeSika Technology AG
InventorsAndreas Kramer, Urs Burckhardt, Ursula Stadelmann, Edis Kasemi
Life of this patent
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Abstract
The present invention relates to curing agents for epoxy resins including an alkylated polyethyleneimine. These curing agents have high functionality and a high content of secondary amino groups. Together with epoxy resins, they cure surprisingly quickly and without blushing effects even under humid and cold conditions to form films having very high cross-linking density. They are suited for coatings with high resistance requirements.
Claims11
A curing agent, which is suitable for curing epoxy resins and comprises at least one amine with the formula (I),
- where
- A is the group of a polyethyleneimine having a relative molar mass in the range of 300 to 5000 g/mol, following the removal of a primary aliphatic amino groups;
- R is a hydrogen atom or an alkyl group having 1 to 12 carbon atoms;
- a denotes an integer from 1 to 50;
- and
- X is a dialkylamino-substituted aryl group having 6 to 12 carbon atoms.
A curing agent comprising at least one amine with the formula (I),
- where
- A is the group of a polyethyleneimine having a relative molar mass in the range of 300 to 5000 g/mol, following the removal of a primary aliphatic amino groups;
- R is a hydrogen atom or an alkyl group having 1 to 12 carbon atoms;
- a denotes an integer from 1 to 50;
- and
- X is a hydrocarbon group having 1 to 20 carbon atoms, which may optionally include hydroxyl groups, mercapto groups, ether groups, ester groups, pyridino groups or amino groups, and
- at least one further amine having at least two amine hydrogens that are reactive toward epoxide groups.
A method comprising curing at least one epoxy resin with a curing agent comprising at least one amine with the formula (I),
- where
- A is the group of a polyethyleneimine having a relative molar mass in the range of 300 to 5000 g/mol, following of a primary aliphatic amino groups;
- R is a hydrogen atom or an alkyl group having 1 to 12 carbon atoms;
- a denotes an integer from 1 to 50;
- and
- X is a hydrocarbon group having 1 to 20 carbon atoms, which may optionally include hydroxyl groups, mercapto groups, ether groups, ester groups, pyridino groups or amino groups.
An epoxy resin composition comprising at least one epoxy resin and at least one curing agent comprising at least one amine with the formula (I),
- where
- A is the group polyethyleneimine having a relative molar mass in the range of 300 to 5000 g/mol, following the removal of a primary aliphatic amino groups;
- R is a hydrogen atom or an alkyl group having 1 to 12 carbon atoms;
- a denotes an integer from 1 to 50;
- and
- X is a hydrocarbon group having 1 to 20 carbon atoms, which may optionally include hydroxyl groups, mercapto groups, ether groups, ester groups, pyridino groups or amino groups.
Dependencies are inferred from the claim text.