Use of transition metal complexes as bleach catalysts
View Patent ↗The use of compounds of the formula (1) M(L) n X m (1) where M is a metal atom from the group Mn, Fe, Co, Ni, Mo, W, L is a ligand from the group of nitrogen-containing heterocycles, X is chloride, bromide, nitrate, perchlorate, sulfate, ammonia, tetrafluoroborate, hexafluorophosphate or an anion of an organic acid having 1 to 22 carbon atoms, n is a number from 2 to 4 and m is a number from 0 to 4, as catalyst for peroxygen compounds, in particular in washing, bleaching and cleaning compositions is claimed.
1. A method for increasing the oxidation and bleaching action of a peroxygen compound comprising the step of mixing the peroxygen compound with a transition metal complex having nitrogen-containing ligands, wherein the transition metal complex has the formula (1)
M(L) n X m (1)
where
M is a metal atom selected from the group consisting of Mn, Fe, Co, Ni, Mo, and W,
L is a ligand selected from the group consisting of pyridine, imidazole, picoline, imidazoline, pyrrole, pyrazole, triazole, hexamethylenimine, piperidine, lutidine, and mixtures thereof,
X is chloride, bromide, nitrate, perchlorate, sulfate, ammonia, tetrafluoroborate, hexafluorophosphate or an anion of an organic acid having 1 to 22 carbon atoms,
n is a number from 2 to 4 and m is a number from 0 to 4.
2. The method as claimed in claim 1 , wherein the peroxygen compound used is organic peracids, hydrogen peroxide, perborate, percarbonate, or mixtures thereof.
3. The method as claimed in claim 1 , wherein the mixing step occurs in an aqueous solution.
4. The method as claimed in claim 1 , wherein the mixing step further comprises mixing a compound which releases peroxocarboxylic acid under perhydrolysis conditions.
5. A washing, bleaching or cleaning composition comprising a a peroxygen compound and a transition metal complex of the formula (1)
M(L) n X m (1)
where
M is a metal atom selected from the group consisting of Mn, Fe, Co, Ni, Mo, and W,
L is a ligand selected from the group consisting of pyridine, imidazole, picoline, imidazoline, pyrrole, pyrazole, triazole, hexamethylenimine, piperidine, lutidine, and mixtures thereof,
X is chloride, bromide, nitrate, perchlorate, sulfate, ammonia, tetrafluoroborate, hexafluorophosphate or an anion of an organic acid having 1 to 22 carbon atoms,
n is a number from 2 to 4 and m is a number from 0 to 4.
6. A washing, bleaching or cleaning composition as claimed in claim 5 , comprising 0.0025 to 1% by weight of the transition metal complex of the formula (1).
7. A washing, bleaching or cleaning composition as claimed in claim 5 , further comprising a compound which releases peroxycarboxylic acid under perhydrolysis conditions.
8. A washing, bleaching or cleaning composition as claimed in claim 5 , comprising 0.01% by weight to 0.1% by weight of the transition metal complex of formula (1).
9. A washing, bleaching or cleaning composition as claimed in claim 5 , further comprising 2% by weight to 6% by weight of a compound which releases peroxycarboxylic acid under perhydrolysis conditions.