Shaped solid comprising oxidant bleach with encapsulate source of bleach

• US 6,995,129 B2
• Filed: 07/07/2003
• Issued: 02/07/2006
• Est. Priority Date: 02/26/1993
• Status: Expired due to Fees

• Current Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Original Assignee: Ecolab, Inc.
• Inventors: Olson, Keith E., Man, Victor F.
• Primary Examiner(s): Gupta, Yogendra N.
• Assistant Examiner(s): Petruncio, John M.
• Application Number:
  US10/614,734
• Publication Number:
  US 20040082491A1
• Time in Patent Office: 946 Days
• Field of Search: 510/379, 510/381, 510/439, 510/440, 510/441, 510/444, 510/446, 427/213
• US Class Current: 510/379
• CPC Class Codes: C11D 17/0065 Solid detergents containing builders C11D17/06 takes precedence
• CPC Class Codes: C11D 3/3953 Inorganic bleaching agents C11D3/3951 takes precedence
• CPC Class Codes: C11D 3/3955 Organic bleaching agents C11D3/3951 takes precedence
• CPC Class Codes: Y10T 428/2989 Microcapsule with solid core [includes liposome]

Abstract

Aqueous bleach solutions can be made by directing a spray of water onto a bulk or shaped solid (brick, tablet, block, etc.) comprising a continuous solid phase of an encapsulated source of an active halogen bleach or a solid comprising a source of an oxidizing active halogen bleach, and an encapsulated oxidizing halogen bleach source. Such shaped solids can be used to dispense an aqueous bleach concentrate to bleaching locus such as a washing machine.

Claims

1. A shaped solid halogen bleach composition comprising 20 to 90 wt %, based on the solid, of a continuous solid phase of an active halogen bleach source and about 10 to 80 wt %, based on the solid, of an encapsulate active halogen bleach source, said encapsulate active halogen bleach source comprising an active halogen source and at least one encapsulating layer.

2. The solid of claim 1 wherein the shaped solid is a cylindrical solid with a thickness of about 10 to 80 millimeters and a diameter of about 20 to 150 millimeters, wherein the encapsulate active halogen bleach source is evenly dispersed throughout the solid phase.

3. The solid of claim 1 wherein the mass of the solid is at least 1 gram and the encapsulate active halogen bleach source has a diameter no greater than about 5 millimeters.

4. The solid of claim 1 wherein the active halogen bleach comprises a source of active chlorine.

5. The solid of claim 4 wherein the source of active chlorine comprises chlorinated trisodium phosphate, chlorinated sodium tripolyphosphate, or mixtures thereof.

6. The solid of claim 2 wherein the source of active halogen of the continuous phase or the halogen source of the encapsulate comprises a chlorinated isocyanuric acid compound.

7. The solid of claim 1 wherein the encapsulate active halogen bleach source comprises a core of an active halogen source and at least one organic encapsulating layer.

8. The solid of claim 1 wherein the encapsulate active halogen bleach source comprises a core comprising an active halogen source and at least one inorganic encapsulating layer.

9. The solid of claim 1 wherein the encapsulate active halogen bleach source comprises a core of an active halogen source, a first inorganic inner layer and a second organic outer layer.

10. The solid of claim 1 wherein the continuous solid phase contains a binder.

11. The solid of claim 1 wherein the solid comprises a compressed solid.

12. The solid of claim 1 wherein the solid further comprises a wetting agent.

13. The solid of claim 1 wherein the solid further comprises a sequestrant.

26. A method of washing laundry with an aqueous bleach, said method comprising contacting a wash load with an aqueous bleach solution made by contacting the bleach solid of claim 1 with an aqueous spray.

28. The solid of claim 1 wherein the encapsulate active halogen bleach source comprises 30 to 80 wt % of the active halogen source and 20to 70 wt % of the encapsulating layer comprising a coating.

29. The solid of claim 1 wherein the encapsulate active halogen bleach source comprises 40 to 55 wt % of the active halogen source and 45 to 60 wt % of the encapsulating layer comprising a coating.

30. The solid of claim 1, wherein the encapsulate active bleach source comprises about 30 to 80 wt % of the active halogen source, about 5 to 50 wt % of a first inorganic coating agent, and about 5 to 50 wt % of a second synthetic surfactant coating.

31. The solid of claim 30, wherein the first inorganic coating comprises sodium bicarbonate, sodium sesquicarbonate, sodium borate, potassium bicarbonate, potassium sesquicarbonate, potassium borate, diammonium phosphate, monocalcium phosphates, tricalcium phosphate, calcium pyrophosphate, iron pyrophosphate, magnesium phosphate, monopotassium orthophosphate, potassium pyrophosphate, disodium orthophosphate, dihydrate trisodium orthophosphate decahydrate, tetrasodium pyrophosphate, sodium tripolyphosphate, sodium hexametaphosphate, potassium tripolyphosphate, sodium sulfate, or sodium chloride silicate.

32. The solid of claim 30, wherein the second synthetic surfactant coating comprises an anionic surfactant, a cationic surfactant, a nonionic surfactant, or an amphoteric surfactant.

14. A solid tablet chlorine bleach composition comprising 20 to 90 wt %, based on the solid, of a continuous solid phase of an active chlorine source and about 10 to 80 wt %, based on the solid, of an encapsulate chlorinated isocyanuric acid, said encapsulate chlorinated isocyanuric acid comprising an active core of chlorinated isocyanuric acid and at least one encapsulating layer.

15. The solid of claim 14 wherein the solid has a thickness of about 20 to 80 millimeters and a diameter of about 50 to 150 millimeters.

16. The solid of claim 14 wherein the chlorine source of the continuous solid phase comprises chlorinated isocyanuric acid.

17. The solid of claim 15 having a mass of at least 1 gram and the encapsulate chlorinated isocyanuric acid has a diameter of no greater than about 5 millimeters.

18. The solid of claim 14 wherein the active chlorine source comprises chlorinated trisodium phosphate, chlorinated trisodium polyphosphate, calcium hypochlorite or mixtures thereof.

19. The solid of claim 14 wherein the encapsulate chlorinated isocyanuric acid has at least one inorganic layer.

20. The solid of claim 14 wherein the encapsulate chlorinated isocyanuric acid has at least one organic layer.

21. The solid of claim 14 wherein the encapsulate chlorinated isocyanuric acid comprises a core of chlorinated isocyanuric acid, a first inner inorganic layer and an external organic layer.

22. The solid of claim 14 wherein the solid phase further contains a diluent.

23. The solid of claim 14 wherein the solid phase further contains a binder.

24. The solid of claim 14 wherein the solid phase further comprises a wetting agent.

25. The solid of claim 14 wherein the solid phase further comprises a sequestrant.

27. A method of washing laundry with an aqueous bleach, said method comprising contacting a wash load with an aqueous bleach solution made by contacting the bleach solid of claim 14 with an aqueous spray.