Bleach activation
AssigneeLever Brothers Company, Divison of Conopco, Inc.
InventorsCornelis G. Van Kralingen, Rudolf J. Martens, Mark E. Rerek, Ton Swarthoff, Marten Van Vliet
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Abstract
Peroxy compound bleaching is activated by a catalytic amount of a transition metal complex of a transition metal (Mn, Co, Fe or Cu) with a non-(macro)-cyclic ligand of the formula: ##STR1## preferably 2,2'-bispyridylamine. Bleaching agent and bleach detergent compositions are also disclosed comprising a peroxy compound bleach and said transition metal complex. The transition metal complex is an effective catalyst for activating hydrogen peroxide compounds, peroxyacids and peroxyacid bleach precursors on removing a wide class of stains from substrates, especially texiles and fabrics.
Claims7
Process for the bleaching and cleaning of substrates employing a bleaching agent selected from the group of peroxy compound bleaches consisting of hydrogen peroxide, hydrogen peroxide-liberating compounds, peroxyacids and their salts, and peroxyacid bleach precursors and mixtures thereof, characterized in that said bleaching agent is activated by a catalytic amount of a transition metal complex of the following general formula:
- [M.sub.n (L).sub.m X.sub.p ].sup.1 Y.sub.z (I)
- wherein M is a metal ion selected from the group consisting of Mn, Fe, Co, and Du;
- X is selected from the group consisting of Cl.sup.-, Br.sup.-, I.sup.-, NO.sub.3.sup.-, CLO.sub.4.sup.-, NCS.sup.-, OH.sup.-, O.sub.2.sup.2-, O.sub.2.sup.-, HO.sub.2.sup.-, H.sub.2 O.sub.2, H.sub.2 O, NH.sub.3, and pyridine;
- n represents an integer from 1 to 2;
- m is an integer from 1-5;
- p is an integer from 0-8;
- Y is a counter ion, the type of which is independent upon the charge z of the complex;
- z denotes the charge of the complex and is an integer which can be positive or negative, whereby, if z is positive, Y is a common anion as denoted for X and, if z is negative, Y is a common cation selected from the group consisting of alkali metal, alkaline earth metal and an alkyl ammonium cation;
- and L is a ligand selected from the group consisting of 2,2-bispyridylamine and 2,2-bispyridylmethane.
A bleaching agent composition comprising a peroxy compound bleach selected from the group consisting of hydrogen peroxide, hydrogen peroxide-liberating compounds, peroxyacids and their salts and peroxyacid bleach precursors and mixtures thereof, and a catalyst for the bleaching action of said peroxy compound bleach, characterized in that said catalyst is a transition metal complex of the following general formula:
- [M.sub.n (L).sub.m X.sub.p ].sup.z Y.sub.z (I)
- wherein M is a metal ion selected from the group consisting of Mn, Fe, Co, and Cu;
- X is selected from the group consisting of Bl.sup.-,Br.sup.-, I.sup.-, NO.sub.3.sup.-, CLO.sub.4.sup.-, NCS.sup.-, OH.sup.-, O.sub.2.sup.2-, O.sub.2.sup.-, HO.sub.x.sup.-, H.sub.2 O.sub.2, H.sub.2 O, NH.sub.3, and pyridine;
- n represents an integer from 1 to 2;
- m is an integer from 1-5;
- p is an integer from 0-8;
- Y is a counter ion, the type of which is dependent upon the charge z of the complex;
- z denotes the charge of the complex and is an integer which can be positive or negative, whereby, if z is positive, Y is a common anion as denoted for X and, if z is negative, Y is a common cation selected from the group consisting of alkali metal, alkaline earth metal and an alkyl ammonium cation;
- and L is a ligand selected from the group consisting of 2,2-bispyridylamine and 2,2-bispyridylmethane.
Dependencies are inferred from the claim text.