Manganese bleach catalyst granules for use in dishwash detergents

Patent metadata

Field	Value
Publication number	US-11021681-B2
Application number	US-201515572404-A
Country	US
Kind code	B2
Filing date	Dec 18, 2015
Priority date	May 7, 2015
Publication date	Jun 1, 2021
Grant date	Jun 1, 2021

Abstract

The present invention relates to co-granules comprising an enzyme and a bleach catalyst and to their use in bleach-containing granular automatic dishwash (ADW) detergents.

First claim

The invention claimed is:

1. A granule comprising
(a) a core which comprises an enzyme, surrounded by
(b) a first coating which comprises bleach catalyst particles, which is surrounded by
(c) a second coating comprising at least 60% by weight of a water-soluble salt having a constant humidity at 20° C. which is above 85%;
wherein the bleach catalyst particles comprise at least 80% by weight of a manganese complex with nitrogen-containing ligands, characterized in that at least 70% by weight of the particles have particle sizes in the range from 1 μm to 50 μm, at most 15% by weight of the particles have particle sizes of >50 μm, and at most 15% by weight of the particles have particle sizes of <1 μm, wherein the percentages are based on the total amount of the particles.

2. The granule of claim 1 , wherein the nitrogen-containing ligands comprise at least one ligand selected from di- or trimethyltriazacyclononanes.

3. The granule of claim 1 , wherein the manganese complex has the below formula (1) or (2):

wherein a is 1 or 2, b is a number from 0 to 4, and X is any monovalent or divalent anion.

4. The granule of claim 1 , wherein the manganese complex is bis (N,N′,N″-trimethyl-1,4,7-triazacyclononane)-trioxo-dimanganese (IV) di(hexafluorophosphate) monohydrate.

5. The granule of claim 1 , wherein the bleach catalyst particles have a volume average particle size D50 in the range of 2 to 25 μm.

6. The granule of claim 1 , wherein the enzyme is an amylase, a lipase, a protease, a cellulase, a mannanase, or a pectate lyase.

7. The granule of claim 1 , wherein the core further comprises a reducing agent and/or an antioxidant and/or a salt of a multivalent cation and/or an acidic buffer.

8. The granule of claim 7 , wherein the reducing agent is a thiosulfate, cysteine, or methionine.

9. The granule of claim 7 , wherein the reducing agent is present in an amount of 0.1-10% by weight relative to the core.

10. The granule of claim 7 , wherein the acidic buffer comprises a mixture of citric acid and a citrate.

11. The granule of claim 7 , wherein the acidic buffer is present in an amount of 0.1-10% by weight relative to the core.

12. The granule of claim 7 , wherein the salt of a multivalent cation is a salt of Mg or Zn.

13. The granule of claim 7 , wherein the salt of a multivalent cation is present in an amount of 0.1-15% as anhydrous salt by weight of the core, or 0.02-6% as multivalent cation by weight of the core.

14. The granule of claim 1 , wherein the coating makes up 5-70% by weight relative to the core and comprises at least 60% by weight w/w of a salt having a constant humidity at 20° C. of at least 60%.

15. The granule of claim 1 , wherein the second coating comprises sodium sulfate.

16. The granule of claim 1 , which further comprises an additional coating on the outside of the second coating, wherein the additional coating comprises a film-forming agent selected from the group consisting of polyethylene glycol, hydroxypropyl methyl cellulose, and polyvinyl alcohol (PVA).

17. A method for producing a granule comprising
(a) preparing a core which comprises an enzyme,
(b) surrounding the core with a first coating which comprises bleach catalyst particles,
(c) surrounding the first coating with a second coating comprising at least 60% by weight of a water-soluble salt having a constant humidity at 20° C. which is above 85%;
wherein the bleach catalyst particles comprise at least 80% by weight of a manganese complex with nitrogen-containing ligands; wherein at least 70% by weight of the particles have particle sizes in the range from 1 μm to 50 μm, at most 15% by weight of the particles have particle sizes of >50 μm and at most 15% by weight of the particles have particle sizes of <1 μm, wherein the percentages are based on the total amount of the particles.

18. A granular automatic dishwash detergent composition which comprises a bleaching system comprising a H 2 O 2 source, which detergent composition further comprises a granule of claim 1 .

19. The composition of claim 18 , which further comprises a bleach activator.

Assignees

• Novozymes As

Inventors

• Shang Lei
• Skagerlind Peter
• Andric Pavle
• Nielsen Niels-Viktor
• Engsted Kaare Joergensen

Classifications

• C11D3/3935 Primary

  granulated, coated or protected · CPC title

• C11D3/38672 Primary

  Granulated or coated enzymes · CPC title

• B01J2531/72

  Manganese · CPC title

• C11D3/122

  Sulfur-containing, e.g. sulfates, sulfites or gypsum · CPC title

• B01J31/182

  comprising aliphatic or saturated rings · CPC title