Bleach granules comprising an active coating
View Patent ↗The invention relates to co-granules containing a granule core and a sheath or coating layer surrounding the granule core. Said co-granules are characterized in that the granule core contains a) at least one bleach activator, a2) between 0 and 20 wt. % of the total quantity of at least one bleach catalyst contained in the co-granule, and c) at least one binding agent, and the sheath or coating layer contains d) between 80 and 100 wt. % of the total quantity of the at least one bleach catalyst contained in the co-granule, and e) at least one coating agent. The co-granules are advantageously suitable for producing cleaning products and detergents and especially products for washing crockery in a machine.
1. A cogranule comprising a granule core and a shell layer or coating layer surrounding the granule core, wherein the granule core comprises
a) at least one bleach activator, and
c) at least one binder
and wherein the shell layer or coating layer comprises
d) at least one transition metal bleach catalyst and
e) at least one coating agent selected from the group consisting of fatty acids, alcohol ethoxylates, and polymers,
and the weight ratio of granule core to shell layer or coating layer is from 95:5 to 50:50, further wherein 0% by weight of the total amount of the at least one transition metal bleach catalyst in the cogranule is present in the core, and 100% by weight of the total amount of the at least one transition metal bleach catalyst in the cogranule is present in the shell layer or coating layer.
2. A cogranule as claimed in claim wherein the granule core comprises
a) 1 to 99% by weight of at least one bleach activator and
c) 0.9 to 30% by weight of at least one binder
and the shell layer or coating layer comprises
d) 1 to 99% by weight of at least one transition metal bleach catalyst and
e) 1 to 99% by weight of at least one coating agent.
3. A cogranule as claimed in claim 1 , wherein the granule core comprises
a) 50 to 95% by weight of at least one bleach activator and
c) 4.9 to 20% by weight of at least one binder
and the shell layer or coating layer comprises
d) 2 to 60% by weight of at least one transition metal bleach catalyst and
e) 40 to 98% by weight of at least one coating agent.
4. A cogranule as claimed in claim 1 , wherein the weight ratio of granule core to shell layer or coating layer is from 90:10 to 60:40.
5. A cogranule as claimed in claim 1 , wherein the at least one bleach activator is selected from the group consisting of tetraacetylethylenediamine and decanoyloxybenzoic acid.
6. A cogranule as claimed in claim 1 , wherein the at least one transition metal bleach catalyst is selected from the group consisting of manganese salts and manganese complexes.
7. A cogranule as claimed in claim 1 , wherein the at least one binder is selected from the group consisting of fatty acids, alcohol ethoxylates, polymers and natural clay minerals.
8. A process for producing detergents and cleaners comprising the step of adding a cogranule as claimed in claim 1 to the detergents and cleaners.
9. A process for producing compositions for machine dishwashing comprising the step of adding a cogranule as claimed in claim 1 to the compositions for machine dishwashing.
10. A cogranule as claimed in claim 1 , wherein the at least one coating agent is a fatty acid.
11. A cogranule as claimed in claim 1 , wherein the at least one binder is a natural clay mineral.