Drier for auto-oxidisable coating compositions

A drier for air-drying auto-oxidizable resin compositions, said drier being obtained by:

• providing a manganese salt having the general formula Mn2+[X]n, wherein anion X is selected from the group consisting of PF6−, SbF6−, AsF6−, BF4−, B(C6F5)4−, Cl−, Br−, I−, NO3−, and R2COO− in which case n=2, or the anion X is SO42− in which case n=1, and wherein R2═C1-C20 alkyl optionally substituted with heteroatoms, C6-C20 aryl optionally substituted with heteroatoms, or a polymeric residue;
• providing 1,4,7-trisubstituted-1,4,7-triazacyclononane (L) wherein said 1,4,7-trisubstituted-1,4,7-triazacyclononane (L) has the general structure
• wherein R1 is C1-C20 alkyl optionally substituted with heteroatoms, or C6-C20 aryl optionally substituted with heteroatoms;
• and
• mixing said manganese salt with said 1,4,7-trisubstituted-1,4,7-triazacyclononane (L);
• wherein the 1,4,7-trisubstituted-1,4,7-triazacyclononane (L) is provided in an amount such that the molar ratio of Mn:L is at least 1.25:1.

A method of drying comprising air-drying an auto-oxidizable resin composition with a mixture, the mixture comprising:

• 1,4,7-trisubstituted-1,4,7-triazacyclononane (L) having the general structure
• wherein R1 is C1-C20 alkyl optionally substituted with heteroatoms, or C6-C20 aryl optionally substituted with heteroatoms;
• and
• a manganese salt having the general formula Mn2+[X]n, wherein anion X is selected from the group consisting of PF6−, SbF6−, AsF6−, BF4−, B(C6F5)4−, Cl−, Br−, I−, NO3−, and R2COO− in which case n=2, or the anion X is SO42− in which case n=1, and wherein R2═C1-C20 alkyl optionally substituted with heteroatoms, C6-C20 aryl optionally substituted with heteroatoms, or a polymeric residue;
• wherein the 1,4,7-trisubstituted-1,4,7-triazacyclononane (L) is present in an amount such that the molar ratio of Mn:L is at least 1.25:1.