Method of preparing an oxidatively curable coating formulation
AssigneeBorchers GmbH
InventorsKarin Maaijen, Ronald Hage
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Abstract
The present invention relates to a method of preparing an oxidatively curable coating formulation made from an oxidatively curable alkyd-based resin, a complex comprising one or more manganese ions and one or more triazacyclononane-based ligands; and to the use of triazacyclononane-based ligands for accelerating the rate of curing of an alkyd-based resin formulation by such complexes. The formulations may be paints or other oxidatively curable coating compositions.
Claims11
A method of accelerating the curing of an alkyd-based resin not containing a triazacyclononane-based ligand, comprising:
- contacting the alkyd-based resin not containing the alkyl triazacyclononane-based ligand with a manganese ion-containing complex, the manganese-ion complex comprising a ligand chelating through either nitrogen atoms or nitrogen and oxygen atoms, and not containing the triazacyclononane-based ligand;
- followed by contacting the alkyd-based resin not containing the triazacyclononane-based ligand with at least one triazacyclononane-based ligand of formula (I):
- wherein:
- p is 3;
- R is independently selected from the group consisting of C1-24alkyl, C6-18aryl, C6-18arylC1-6alkyl, CH2CH2OH and CH2COOH;
- and
- R2, R3, and R4 are independently selected from H, C1-4alkyl and hydroxyC1-4-alkyl);
- and
- to form a complex comprising one or more manganese ions having oxidation states independently selected from (II)-(V) and the ligand of formula (I);
- the complex comprising one or more manganese ions and the ligand of Formula (I) having a stoichiometric excess of the at least one triazacyclononane-based ligand of formula (I) with respect to the concentration of the Mn ions.
A method of accelerating the curing of an alkyd-based resin not containing a triazacyclononane-based ligand, comprising:
- contacting the alkyd-based resin not containing the triazacyclononane-based ligand with a manganese ion-containing complex, the manganese-ion complex comprising a ligand chelating through either nitrogen atoms or nitrogen and oxygen atoms, and not containing the triazacyclononane-based ligand;
- followed by contacting the alkyd-based resin not containing the triazacyclononane-based ligand with at least one triazacyclononane-based ligand of formula (I):
- wherein:
- p is 3;
- R is independently selected from the group consisting of C1-24alkyl, C6-18aryl, C6-18arylC1-6alkyl, CH2CH2OH and CH2COOH;
- and
- R2, R3, and R4 are independently selected from H, C1-4alkyl and hydroxyC1-4-alkyl;
- and
- to form a complex comprising one or more manganese ions having oxidation states independently selected from (II)-(V) and the ligand of formula (I) chelating through either nitrogen atoms or nitrogen and oxygen atoms, with the proviso that:
- the complex comprising one or more manganese ions having oxidation states independently selected from (II)-(V) and the ligand of formula (I) does not comprise two manganese ions bridged by three ligands, at least one of which is a bridging oxo (02−) ligand;
- the complex comprising one or more manganese ions having oxidation states independently selected from (II)-(V) and the ligand of formula (I) and the alkyd-based resin having a stoichiometric excess of the ligand of formula (I) with respect to the concentration of Mn ions;
- and wherein formula (I) is 1,4,7-C1-10alkyl-1,4,7-triazacyclononane;
- and wherein a molar ratio of manganese ions and the chelant of formula (I) is between 1:1 and 20:1;
- and wherein a concentration of manganese ions of between about 0.0001 and about 0.3 wt % with respect to curable resin.
Dependencies are inferred from the claim text.