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 method of preparing a bleach composition consisting of:
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 melt the binder and form a granulate wherein the binder substantially coats the one of a bleach activator and a bleach component; and
adding to the granulate the other of the bleach activator and the bleach component to form a co-granulate; with a coating material selected from the group consisting of waxes, silicones, soaps, anionic surfactants, cationic surfactants, anionic polymers and cationic polymers; and optionally processing the co-granulate to produce a median particle size between 300 and 900 microns, and a density between 800 and 1200 grams/liter
coating the 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
the binder being selected from the group consisting of fatty acids, fatty acid polyol esters, polyglycols and fatty alcohol oxyalkylates.
2. The method of claim 1 , wherein the bleach activator is present in the co-granulate at an amount from about 1-50% by weight, the bleach component is present in the co-granulate at an amount from about 50-99% by weight and the binder is present in the co-granulate- at an amount from about 1-50% by weight.
3. The method of claim 1 , wherein the bleach activator is present in the co-granulate at an amount from about 1-20% by weight, the bleach component is present in the co-granulate at an amount from about 75-99% by weight and the binder is present in the co-granulate- at an amount from about 1-20% by weight.
4. The method of claim 1 , 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.
5. The method of claim 1 , wherein the bleach activator is selected from the group consisting of 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, and pentaglucose.
6. The method of claim 1 , wherein the bleach activator is tetra acetyl ethylene diamine (TAED).
7. The method of claim 1 , wherein the bleach activator is sodium-nonanoyloxy benzene sulfonate (NOBS).
8. The method of claim 1 , further comprising processing the co-granulate to produce a median particle size between 550 and 700 microns.
9. The method of claim 1 , further comprising processing the co-granulate to produce a density between 900 and 1050 grams/Liter.
10. A bleaching agent co-granulate, which is prepared according to the process of claim 1 , consisting of:
a bleach component selected from the group consisting of sodium percarbonate and sodium perborate;
a bleach activator selected from the group consisting of an N— or O-Acyl compound, an acylated alkylene diamine, tetra acetyl glycouril, N-acylated hydantoine, 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);
a binder selected from the group consisting of fatty acids, fatty acid polyol esters, polyglycols and fatty alcohol oxyalkylates;
the binder at about 1-20% by weight, wherein said bleach component and said bleach activator are present at a ratio of about 1:1 to about 9:1 parts by weight; and a coating material selected from the group consisting of waxes, silicones, soaps, anionic surfactants, cationic surfactants, anionic polymers and cationic polymers.
11. The bleaching agent co-granulate of claim 10 , wherein said binder is present at about 5-10% by weight, wherein said bleach component and said bleach activator are present at a ratio of about 1:1 to about 5:1 parts by weight.
12. The bleaching agent co-granulate of claim 10 , wherein the co-granulate has a median particle size between about 550 and 700 microns.
13. The bleaching agent co-granulate of claim 10 , wherein the co-granulate has a density between about 900 and 1050 grams/Liter.