Use of transition metal complexes having lactam ligands as bleaching catalysts
View Patent ↗The use of compounds of the formula (1) M(L) n X m (1) in which M is a metal atom from the group consisting of Mn, Fe, Co, Ni, Mo and W, L is a ligand from the group consisting of the cyclic carboxamides (lactams), X is chloride, bromide, nitrate, perchlorate, citrate, hexafluorophosphate or anions of organic acids having C 1 –C 22 carbon atoms and n is a number from 2 to 4 and m is a number from 0 to 4, as catalysts for peroxygen compounds, in particular in detergents, bleaches and cleaning agents, is claimed.
1. A method of improving the bleaching effect of a peroxygen compound at temperatures below 80 degrees Celsius, said method comprising adding to the peroxygen compound a transition metal complex having a lactam ligand as a bleaching catalyst wherein the transition metal complex has the formula (1)
M(L) n X m
in which
M is a metal atom from the group consisting of Mn, Fe, Co, Ni, Mo, and W, and mixtures thereof,
L is a ligand comprising a cyclic carboxamide selected from the group consisting of substituted azetidinone, unsubsitiuted azetidinone, 2 pyrrolidinone, gamma-valerolactam, delta-valerolactam, epsilon-caprolactam, dodecanelactam, pyrrolones, 3-morpholones, hydrocarbostyril, isohydrocarbostyril, benzopiperidone, naphthostyril and, phenanthridone,
X is chloride, bromide, nitrate, perchlorate, citrate, hexafluorophosphate or anions of organic acids having C 1 –C 22 carbon atoms and
n is a number from 2 to 4 and m is a number from 0 to 4.
2. The method of claim 1 , wherein the peroxygen compound is selected from the group consisting of organic peracids, hydrogen peroxide, perborate, percarbonate and mixtures thereof.
3. The method of claim 1 , wherein the transition metal complex is added with a compound eliminating peroxocarboxylic acid under perhydrolysis conditions.
4. A bleaching composition having an improved bleaching effect at temperatures below 80 degrees Celsius, said bleaching composition comprising a peroxygen compound and a transition metal complex having a lactam ligand as a bleaching catalyst, wherein the transition metal complex has the formula (1)
M(L) n X m
in which
M is a metal atom from the group consisting of Mn, Fe, Co, Ni, Mo, W, and mixtures thereof
L is a ligand comprising a cyclic carboxamide selected from the group consisting of substituted azetidinone, unsubsitiuted azetidinone, 2-pyrrolidinone, gamma-valerolactam, delta-valerolactam, epsilon-caprolactam, dodecanelactam, pyrrolones, 3-morpholones hydrocarbostyril, isohydrocarbostyril, benzopiperidone, naphthostyril, and phenanthridone,
X is chloride, bromide, nitrate, perchlorate, citrate, hexafluorophosphate or anions of organic acids having C 1 –C 22 carbon atoms, and
n is a number from 2 to 4 and m is a number from 0 to 4.
5. The bleaching composition as claimed in claim 4 , which contains from 0.0025% by weight to 1% by weight of the transition metal complex.
6. The bleaching composition as claimed in claim 4 , which, in addition to the transition metal complex, contains from 1% by weight to 10% by weight of a compound eliminating peroxocarboxylic acid under perhydrolysis conditions.
7. A detergent comprising the bleaching composition of claim 4 .
8. A cleaning agent comprising the bleaching composition of claim 4 .
9. The bleaching composition of claim 4 , wherein the transition metal complex comprises from 0.01% to 0.1% by weight of the bleaching composition.
10. The bleaching composition of claim 4 , which, in addition to the transition metal complex, contains from 2% by weight to 6% by weight, of a compound eliminating peroxocarboxylic acid under perhydrolysis conditions.
11. A process for cleaning textiles or hard surfaces at temperatures below 80 degrees Celsius, said process comprising contacting textiles or hard surfaces with an aqueous solution comprising the bleaching composition of claim 4 .
12. The process of claim 11 , wherein the temperature ranges from about 10 to 45° C.