Use of transition metal complexes having lactam ligands as bleaching catalysts
AssigneeClariant GmbH
InventorsEkaterina Jonas, Gerd Reinhardt, Daniel Kewitz, Aylin Karadag
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Abstract
The use of compounds of the formula (1) M(L)nXm (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 C1–C22 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.
Claims12
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)nXm
- 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 C1–C22 carbon atoms and
- n is a number from 2 to 4 and m is a number from 0 to 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)nXm
- 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 C1–C22 carbon atoms, and
- n is a number from 2 to 4 and m is a number from 0 to 4.
Dependencies are inferred from the claim text.