Composition containing lanthanide metal complex
Provided is the use of a lanthanide metal complex as a bleaching catalyst. In particular, the lanthanide metal complex comprises a ligand which is an aromatic compound having at least one electron withdrawing substituent and at least one nucleophilic group. Provided is also a composition containing the lanthanide metal complex.
1. A composition comprising-:
a) a source of hydrogen peroxide; and
b) a lanthanide metal complex comprising-:
a metal selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, and
an aromatic compound as a ligand, wherein the aromatic compound has general formula (I), (II), or (III):
wherein:
R 1 is SO 3 X or COOX;
R 2 is H, methyl, SO 3 M or COOX;
X is H or an alkli metal; and
M is an alkli metal.
2. The composition according to claim 1 , wherein the metal is selected from Ce, Pr and Nd.
3. The composition according to claim 1 , wherein the alkali metal is selected from Li, Na and K.
4. The composition according to claim 1 , wherein the aromatic compound is selected from the group consisting of compounds of tiron, 3,4-dihydroxybenzenesulfonic acid, sodium 6,7-dihydroxynaphthalene-2-sulfonate, sodium 2,3-dihydroxybenzoate, potassium 3,4-dihydroxbenzoate, 2,3-dihydroxybenzoic acid, 3,4-dihydroxybenzoic acid, 2,2′-bipyridine-4-carboxylic acid, 2,2′-bipyridine-5,5′-dicarboxylic acid and 2,2′-bipyridine-4,4′-dicarboxylic acid.
5. The composition according to claim 4 , wherein the aromatic compound is selected from the group consisting of compounds of tiron, sodium 6,7-dihydroxynaphthalene-2-sulfonate, 2,3-dihydroxybenzoic acid, 3,4-dihydroxybenzoic acid and 2,2′-bipyridine-4,4′-dicarboxylic acid.
6. The composition according to claim 1 , wherein the source of hydrogen peroxide is selected from the group consisting of hydrogen peroxide, inorganic peroxide salts, organic peroxides, and mixtures thereof.
7. The composition according to claim 6 , wherein the source of hydrogen peroxide is hydrogen peroxide.
8. The composition according to claim 1 , wherein the composition comprises:
(a) from 0.1 to 70% by weight of the source of hydrogen peroxide, with respect to the total weight of the composition; and
(b) from 0.01-5% by weight of the lanthanide metal complex calculated by lanthanide metal, with respect to the total weight of the composition.
9. The composition according to claim 8 , wherein the composition comprises:
(c) from 1 to 50% by weight of the source of hydrogen peroxide, with respect to the total weight of the composition; and
(d) from 0.1-1% by weight of the lanthanide metal complex calculated by lanthanide metal, with respect to the total weight of the composition.
10. The composition according to claim 1 , wherein the composition comprises:
(e) from 0.01-5% by weight of the source of hydrogen peroxide, with respect to the total weight of the composition; and
(f) from 0.2-0.5% by weight of the lanthanide metal complex calculated by lanthanide metal, with respect to the total weight of the composition.
11. The composition according to claim 1 , wherein the composition further comprises a detergent.
12. The composition according to claim 1 , wherein the composition further comprises water.
13. A method for treating a substrate, comprising the step of contacting the substrate with the composition according to claim 1 .
14. The method according to claim 13 , wherein the substrate is a textile, a pulp or a paper.
15. A method for removing cooked-, baked-, or burnt-on food soil from cookware or tableware, the method comprising a step of contacting the cookware tableware with a composition according to claim 1 .