A particulate material comprising a bleach catalyst wherein the particles of the bleach catalyst have a coating and the weight ratio of the coating to the bleach catalyst is in the range of from 10-60 wt %. The particulate material exhibits good stability.
1. A coated particulate material comprising a core and a coating material, wherein the core comprises a bleach catalyst selected from a Mn(II) and/or Mn(III) compound, and the coating material which forms a shell around the core which coating material comprises a) a polyol; or b) a monomeric/polymeric carboxylate/carboxylic compound or a derivative thereof, selected from the group consisting of citric acid/citrate and derivatives thereof, maleic acid/maleate and derivatives thereof, and polyacrylate/polyacrylic acid and derivatives/copolymers thereof.
2. A particulate material according to claim 1 , wherein the pH of the material used for the coating material is <7.
3. A particulate material according to claim 1 , wherein the polyol comprises a polymeric polyol.
4. A particulate material according to claim 1 , wherein the polyol comprises hydrolysed polyacetates, sugars, starch and starch derivatives, cellulose derivatives, oligosaccharides and derivatives thereof.
5. A particulate material according to claim 1 , wherein the bleach catalyst has an initial particle size (before coating) of less than 2000 μm.
6. A particulate material according to claim 1 which comprises an agglomerate of individual bleach catalyst particles.
7. A solid detergent composition comprising a particulate material according to claim 1 .
8. A solid detergent composition according to claim 7 , wherein the composition comprises a tabletted composition.
9. A particulate material according to claim 1 wherein the coating material comprises a polyol.
10. A particulate material according to claim 5 , wherein the bleach catalyst has an initial particle size (before coating) of less than 1200 μm.
11. A particulate material according to claim 10 , wherein the bleach catalyst has an initial particle size (before coating) of less than 1000 μm.
12. A particulate material according to claim 1 , wherein the weight ratio of the coating material to the bleach catalyst is in the range of from 10-60% wt.
13. A particulate material according to claim 1 , wherein core consists essentially of Mn(II) and/or Mn(III) compounds.
14. A particulate material according to claim 13 , wherein the core consists of Mn(II) and/or Mn(III) compounds.
15. A particulate material according to claim 1 , wherein the coating material consists essentially of a material selected from: a) a polyol; or b) a monomeric/polymeric carboxylate/carboxylic compound or a derivative thereof, which is selected from the group consisting of citric acid/citrate and derivatives thereof, maleic acid/maleate and derivatives thereof, and polyacrylate/polyacrylic acid and derivatives/copolymers thereof; or a mixture thereof.
16. A particulate material according to claim 15 , wherein the coating material consists of a material selected from: a) a polyol; or b) a monomeric/polymeric carboxylate/carboxylic compound or a derivative thereof, which is selected from the group consisting of citric acid/citrate and derivatives thereof, maleic acid/maleate and derivatives thereof, and polyacrylate/polyacrylic acid and derivatives/copolymers thereof; or a mixture thereof.
17. A particulate material according to claim 1 consisting of:
a core comprising a bleach catalyst selected from the Mn(II) and/or Mn(III) compound, and
a coating material which forms a closed shell around the core which coating material is selected from: a) a polyol; or b) a monomeric/polymeric carboxylate/carboxylic compound or a derivative thereof, selected from the group consisting of citric acid/citrate and derivatives thereof, maleic acid/maleate and derivatives thereof, and polyacrylate/polyacrylic acid and derivatives/copolymers thereof; or a mixture thereof.
18. A coated particle comprising:
a core comprising a bleach catalyst selected from a Mn(II) and/or Mn(III) compound, and;
a coating material which forms a shell around the core which includes a coating material selected from: a) a polyol; or b) a monomeric/polymeric carboxylate/carboxylic compound or a derivative thereof, selected from the group consisting of citric acid/citrate and derivatives thereof, maleic acid/maleate and derivatives thereof, and polyacrylate/polyacrylic acid and derivatives/copolymers thereof; or a mixture thereof thereof.
19. A coated particle according to claim 18 wherein:
the core consists essentially of a bleach catalyst selected from a Mn(II) and/or Mn(III) compound.
20. A coated particle according to claim 18 wherein:
the coating material consists essentially of a) a polyol; or b) a monomeric/polymeric carboxylate/carboxylic compound or a derivative thereof, selected from the group consisting of citric acid/citrate and derivatives thereof, maleic acid/maleate and derivatives thereof, and polyacrylate/polyacrylic acid and derivatives/copolymers thereof; or a mixture thereof.