abstract |
The invention relates to adrier for an air drying auto-oxidisable resin compositioncomprising a polymer comprising unsaturated fatty acid residues, the drier comprising a manganese triaza complex comprising the following structure: wherein R 1 = C 1- C 20 alkyl optionally substituted with heteroatoms, or C 6 -C 20 aryl optionally substituted with heteroatoms; X and Y are independently selected from O and OC(R 2 )O, in which a=4 when X=O, and a=3 when X= OC(R 2 )O, and in which b=4 when Y=O, and b=3 when Y= OC(R 2 )O;Wherein R 2 = C 1- C 20 alkyl optionally substituted with heteroatoms, C 6 -C 20 aryl optionally substituted with heteroatoms, or a polymeric residue, and one or more anions, being chosen PF6-, SbF 6 -, AsF6-, BF 4 -, B(C 6 F 5 ) 4 -, Cl-, Br-, I-, NO 3 -, or R 3 COO-or SO 4 n 2- , and wherein R 3 is C 1- C 20 alkyl optionally substituted with heteroatoms, C 6 -C 20 aryl 1optionally substituted with heteroatoms, or a polymeric residue,and wherein the drier comprises an additional amount of,4,7–trialkyl-1,4,7-triazacyclononane; wherein the1,4,7–trialkyl-1,4,7-triazacyclononane (L) ispresent in an amount such that the molar ratio of L:Mn is at least 1.25:1 and preferably at least1.5:1. |