COATED BLEACH CATALYST(S)

Abstract

Provided is a granule containing a core containing one or more bleach catalyst(s), one or more binder(s), optionally a bleach activator and further a coating a containing a polymer or a carboxylic acid as well as a detergent composition containing such a granule, a method for preparing the granule and the use of such a granule in cleaning compositions.

Claims

1. A co-granule comprising: (A) a core comprising: a) at least one metal-containing bleach catalyst; b) at least one binder; optionally at least one bleach activator; and (B) a coating comprising: at least one of the components selected from: (i) polyvinyl alcohol (PVA), copolymers of PVA and polyethylene glycol (PEG), polyvinyl acetate, polyvinylpyrrolidone, ethylenvinylalcohol, sodium lauryl sulfate; or (ii) an acid component selected from acid polymers comprising sulfonic acid groups and carboxylic acids.

2. The co-granule according to claim 1, wherein the coating comprises at least one of the components selected from the group consisting of polyvinyl alcohol (PVA), copolymers of PVA and polyethylene glycol (PEG), copolymers of acrylic acid and sulfonic acid, citric acid/citrate and mixtures thereof.

3. The co-granule according to claim 2, wherein the coating comprises at least a copolymer comprising acrylic acid and sulfonic acid monomers, or citrate.

4. The co-granule according to claim 1, wherein the at least one bleach catalyst is selected from bleach catalysts containing manganese, iron, cobalt, ruthenium, molybdenum, titanium or vanadium; preferably the bleach catalyst is selected from manganese salts and/or manganese complexes, more preferably the bleach catalyst is Mn.sup.IV.sub.2(-O).sub.3(1,4,7-trimethyl-1,4,7-triazacyclononane).sub.2-(PF.sub.6).sub.2(MnTACN).

5. The co-granule according to claim 1, further comprising: at least one further component selected from stabilizers, rinsing aids, fluorescent agents, surfactants, pigments, colorants, suds suppressors, builders, perfumes, enzymes, silver protection agents, anti-tarnishing additives, anti-corrosion agents either in the core or in the coating, preferably in the core.

6. The co-granule according to claim 1, wherein the at least one binder b) is carboxymethyl cellulose and/or carboxymethyl cellulose derivatives.

7. The co-granule according to claim 1, wherein the at least one bleach activator is selected from the group consisting of tetraacetylethylenediamine (TAED), sodium nonanoyloxybenzene sulfonate (NOBS), acetyl caprolactone, N-methyl morpholinium acetonitrile and salts thereof, sodium 4-(2-decanoyl-oxyethoxycarbonyloxy)benzenesulfonate (DECOBS) and salts thereof, lauryloxybenzylsulfonate (LOBS), iso-lauryloxybenzylsulfonate (I-LOBS), N-methylmorpholinum-acetonitril (MMA), Pentaacetylglucose, Nitrilquats, Benzoylcaprolactam (BzCL), 4-nitrobenzoylcaprolactam, 3-clorobenzoylcaprolactam, benzoyloxybenzylsulfonate (BOBS), phenylbenzoate (PhBz), decanoyloxybenzylsulfonate (C10-OBS), benzoylvalerolactam (BZVL), octanoyloxybenzylsulfonate (C8-OBS), 4-[N-(nonanoyl)aminohezanoyloxy]-benzylsulfonate-sodium salt (NACA-OBS), 10-undecenoyloxybenzylsulfonate (UDOBS), decanoyloxybenzoec acid (DOBA), perhydrolyzable ester, perhydrolytic enzyme combined with an by this enzyme hydrolysable substrate, acetyl caprolactone, Acetyl caprolactam (N-acetylhexanelactam), N-methyl morpholinium acetonitrile and salts thereof, preferably the bleach activator is

8. The co-granule according to claim 1, wherein the core comprises a) Mn.sup.IV.sub.2(-O).sub.3(1,4,7-trimethyl-1,4,7-triazacyclononane).sub.2-(PF.sub.6).sub.2(MnTACN), b) carboxymethyl cellulose, and c) optionally tetraacetylethylenediamine (TAED).

9. The co-granule according to claim 1, wherein the co-granule further comprises: d) a metal containing amino acid compound.

10. A detergent composition comprising the co-granule according to claim 1.

11. A detergent composition comprising: 0.01-10 wt-% of a co-granule according to claim 1; 1-50 wt-% of at least one anionic and/or nonionic surfactant; 0-50 wt-% of a cationic surfactant; 0-50 wt-% of alkalizing agent; 1-50 wt-% of at least one bleaching agent; 0.1 -80 wt-% of a builder, preferably citrate; 0-50 wt-% sulfonic acid group containing polymer; 0-20 wt-% anticorrosion agent; 0-20 wt-% silver protecting agent; and 0-20 wt-% further optional components including fluorescing agents, brightener, enzymes, perfumes.

12. The detergent composition according to claim 10, which is a cleaning composition, preferably a dishwashing cleaning composition

13. A method for cleaning a tableware in an automatic dishwashing process, comprising: treating soiled dishes and a tableware in an automatic dishwasher with the cleaning composition claimed in claim 12 or a solution comprising said composition.

14. (canceled)

15. A method of producing the co-granule according to claim 1.

16. The co-granule according to claim 1, wherein said at least one binder is a cellulosic polymer.

17. The co-granule according to claim 1, wherein said at least one binder is selected from the group consisting of carboxymethyl cellulose hydroxypropyl cellulose hydroxypropylmethyl cellulose, and mixture thereof.

18. The co-granule according to claim 1, wherein the carboxylic acids are mono-, di- or tricarboxylic acids comprising 2 to 15 carbon atoms.

19. The co-granule according to claim 1, wherein the carboxylic acids are mono-, di- or tricarboxylic acids comprising 3 to 8 carbon atoms.

Description

EXAMPLE

[0167] Co-granulates comprising 5 wt.-% MnTACN, 25 wt.-% CMC and 70 wt.-% TAED were coated as defined in table 1. After storage as shown in table 1 the granulate was added to an automatic dishwashing composition comprising builder, percarbonate, nonionic surfactant and sulfonic acid comprising copolymer, and the cleaning performance was tested and scored (% cleaning) with 100 g soil ballast (black tea).

TABLE-US-00001 TABLE 1 Bleaching performance of detergent compositions comprising the co-granulates according to the invention (in %) Storage time in weeks (0 weeks = 1 to 3 days) Granulate coated with 0 4 12 Granulate uncoated 70 25 28 10% citric acid 65 40 40 20% citric acid 68 41 40 30% citric acid 73 40 39 40% citric acid 70 41 40 10% mannitol 80 46 43 20% mannitol 80 48 42 30% mannitol 80 48 45 40% mannitol 80 49 45 10% Kollicoat Protect (1) 75 62 70 20% Kollicoat Protect (1) 78 64 70 20% Accusol 588 (2) 98 80 78 20% Sodium citrate 85 80 75 10% citric acid 10% Na citrate 78 75 70 (1) Kollicoat Protect (BASF): copolymers of PVA and polyethylene glycol (PEG) (2) Accusol 588 (Rohm & Haas): sulfonic acid/acrylic acid copolmer