Use of transition metal complexes as bleach catalysts in laundry detergents and cleaning compositions
View Patent ↗The use is claimed of transition metal complexes of the formula (I) [M(L)Y n ]X m (I) where M is a metal atom from the group of Mn and Fe, L is a ligand of the general formula (II) or (III) where R1, R2, R3 and R4 are the same or different and are each H, C 1 –C 8 -alkyl or C 6 –C 12 -alkaryl; X and Y are each an uncharged or anionic ligand from the group of CH 3 CN, chloride, bromide, nitrate, perchlorate, sulfate, citrate, hexafluorophosphate, trifluoromethanesulfonate, tetrafluoroborate, tetraphenylborate or an anion of organic acids having C 1 –C 22 carbon atoms, n and m are each a number from 0 to 4 as bleach catalysts in laundry detergents and cleaning compositions.
1. A method for catalyzing a bleaching compound in a laundry detergent or a cleaning composition containing a surfactant, said method comprising adding to the bleach compound, a bleach catalyst comprising a transition metal complex of formula (I)
[M(L)Y n ]X m (I)
where
M is a manganese metal atom;
L is a ligand of the general formula (IV),
where R4 is ethyl,
X and Y are each an uncharged or an anionic ligand selected from the group consisting of CH 3 CN, chloride, bromide, nitrate, perchlorate, sulfate, citrate, hexafluorophosphate, trifluoromethanesulfonate, tetrafluoroborate, tetraphenylborate, an anion of organic acids having C 1 –C 22 carbon atoms, and mixtures thereof,
n and m are each a number from 0 to 4, wherein said laundry detergent or cleaning composition contains from 0.0025% by weight to 1% by weight of the transition metal complex.
2. The method of claim 1 , wherein the bleach compound comprises a peroxygen compound or atmospheric oxygen.
3. A method for bleaching colored stains on hard surfaces or on textiles, said method comprising contacting said colored stains with an aqueous solution of a laundry detergent or a cleaning composition comprising a bleach compound, a surfactant and a transition metal complex of formula (I)
[M(L)Y n ]X m (I)
where
M is a manganese metal atom,
L is a ligand of the general formula (IV),
where R4 is ethyl,
X and Y are each an uncharged or an anionic ligand selected from the group consisting of CH 3 CN, chloride, bromide, nitrate, perchlorate, sulfate, citrate, hexafluorophosphate, trifluoromethanesulfonate, tetrafluoroborate, tetraphenylborate, an anion of organic acids having C 1 –C 22 carbon atoms, and mixtures thereof,
n and m are each a number from 0 to 4, wherein said laundry detergent or cleaning composition contains from 0.0025% by weight to 1% by weight of the transition metal complex.