Co-granulates of bleach activator-peroxide compounds
A process for preparation of co-granules including one or more bleach activators and one or more bleach agent compounds is described. The bleach component is mixed and coated with a binder selected from the group of fatty acids, fatty acid polyol esters, polyglycols and fatty alcohol oxalkylates. One or more bleach activators is added to this mixture followed by granulation or agglomeration in a mixer, resulting in a bleach co-granule composition including the bleach activator and peroxide components.
1. A co-granular composition comprising co-granulate formed from (i) mixing and coating one of a bleach activator and a bleach component with a molten binder to form a molten mixture, and (ii) agglomerating said molten mixture with the other of the bleach activator or the bleach component to form a co-granulate, wherein the bleach component is present in the co-granulate in an amount of 75-99% by weight.
2. The co-granular composition of claim 1 , wherein said bleach component includes one or more of sodium percarbonate and sodium perborate.
3. The co-granular composition of claim 1 , wherein said bleach activator includes one or more of an N— or O-Acyl compound, an acylated alkylene diamine, tetra acetyl glycouril. N-acylated hydaMoine, hydrazine, triazole, hydratriazine, urazole, di-ketopiperazine, sulfurylamide, cyanurate, a carboxylic acid anhydride, sodium-acetoxy-benzene sulfonate, sodium-benzoyloxy benzene sulfonate (BOBS), sodium-lauroyloxy-benzene sulfonate (LOBS), sodium-isononanoyloxy benzene sulfonate (iso-NOBS), acylated sugar derivatives, pentaglucose, tetra acetyl ethylene diamine (TAED), and sodium-nonanoyloxy benzene sulfonate (NOBS).
4. The co-granular composition of claim 1 , wherein said bleach activator includes both hydrophilic and hydrophobic bleach activators.
5. The co-granular composition of claim 1 , wherein said binder includes one or more of fatty acids, fatty acid polyol esters, polyglycols and fatty alcohol oxyalkylates.
6. The co-granular composition of claim 1 , further including a bleaching agent stabilizer selected from the group consisting of a meta silicate and a magnesium salt.
7. The co-granular composition of claim 1 , wherein said binder is present at about 5-10% by weight.
8. The co-granular composition of claim 1 , wherein the co-granulate has a median particle size between about 550 and about 700 microns.
9. The co-granular composition of claim 1 , wherein the co-granulate has a density between about 900 and 1050 grams/Liter.
10. A method of forming co-granulates of bleach composition, comprising:
mixing and coating one of a bleach activator and a bleach component with a binder at a time and temperature sufficient to form a molten mixture;
adding to the molten mixture the other of the bleach activator and the bleach component;
agglomerating the resulting mixture to form a co-granulate;
wherein the bleach component is present in the co-granule in an amount of 75-99% by weight.
11. The method of claim 10 , wherein the bleach activator is present in the co-granulate at an amount from about 5-10% by weight, the bleach component is present in the co-granulate at an amount from about 80-90% by weight and the binder is present in the co-granulate at an amount from about 5-10% by weight.
12. The method of claim 10 , wherein the bleach activator comprises one or more of an N— or O-Acyl compound, an acylated alkylene diamine, tetra acetyl glycouril, an N-acylated hydantoine a hydrazine, a triazole, a hydratriazine, a urazole, a di-ketopiperazine, a sulfurylamide and a cyanurate.
13. The method of claim 10 , wherein the bleach activator comprises tetra acetyl ethylene diamine (TAED),
14. The method of claim 10 , wherein the bleach activator comprises sodium-nonanoyloxy benzene sulfonate (NOBS).
15. The method of claim 10 , further comprising processing the co-granulate to produce a median particle size between 300 and 900 microns.
16. The method of claim 10 , wherein the bleach component is selected from the group consisting of sodium percarbonate and sodium perborate.
17. The method of claim 10 , wherein the binder is selected from the group consisting of fatty acids, fatty acid polyol esters, polyglycols and fatty alcohol oxyalkylates.
18. The method of claim 10 , wherein the granulate is mixed for 2 to 10 minutes in a granulator at a temperature of 30 to 100 degrees C.
19. A method of forming co-granulates of bleach composition, comprising:
mixing one of a bleach activator and a bleach component with a binder for between 2 to 10 minutes at a temperature of between 30-100 degrees C. to form a molten mixture wherein the binder substantially coats the one of a bleach activator and a bleach component; and
adding to the molten mixture the other of the bleach activator and the bleach component; agglomerating the resulting mixture to form a co-granulate;
the bleach activator being selected from the group consisting of an N— or O-Acyl compound, an acylated alkylene diamine, tetra acetyl glycouril, an N-acylated hydantoine, a hydrazine, a triazole, a hydratriazine, a urazole, a di-ketopiperazine, a sulfurylamide and a cyanurate;
the bleach component being selected from the group consisting of sodium percarbonate and sodium perborate and is present in the co-granulate in an amount of 75-99% by weight; and
the binder being selected from the group consisting of fatty acids, fatty acid polyol esters, polyglycols and fatty alcohol oxyalkylates.