Extended release tablet and method for making and using same

• US 8,343,524 B2
• Filed: 07/31/2009
• Issued: 01/01/2013
• Est. Priority Date: 07/31/2008
• Status: Active Grant

• Current Assignee: Clarke Mosquito Control Products, Inc.
• Original Assignee: Clarke Mosquito Control Products, Inc.
• Inventors: Willis, Michael Dean, Saunders, Marie Elizabeth
• Primary Examiner(s): Pryor, Alton
• Application Number:
  US12/533,937
• Publication Number:
  US 20100029486A1
• Time in Patent Office: 1,250 Days
• Field of Search: None
• US Class Current: 424/408
• CPC Class Codes: A01N 2300/00 Combinations or mixtures of active ingredients covered by classes A01N27/00 - A01N65/48 with other active or formulation relevant ingredients, e.g. specific carrier materials or surfactants, covered by classes A01N25/00 - A01N65/48
• CPC Class Codes: A01N 25/08 containing solids as carriers or diluents
• CPC Class Codes: A01N 25/10 Macromolecular compounds
• CPC Class Codes: A01N 25/12 Powders or granules A01N25/26 takes precedence
• CPC Class Codes: A01N 25/34 Shaped forms, e.g. sheets, not provided for in any other sub-group of this main group
• CPC Class Codes: A01N 43/22 rings with more than six members

Abstract

Provided are cap layer compositions and base layer compositions, providing quick and extended release of an active ingredient, respectively, when placed in water. Further provided are dual release compositions including a base composition and a cap composition. The base composition may include a plaster and an active agent, and it may further include at least one of a water-soluble binder, a non-water-soluble binder, and a lubricant. The cap composition may include a plaster and an active agent, and it may further include at least one of a disintegrating agent, a non-water-soluble binder, and a lubricant. The compositions may be heated and mixed and formed into a tablet. Further provided are methods of making the compositions. Further provided are methods of controlling or eliminating pests and methods of increasing the potability of water. The compositions are effective for controlling or eliminating pests such as mosquitoes when applied at an application site.

Claims

1. A dual-release compressed tablet comprising:

a cap composition in an upper layer comprising at least one active agent and a plaster;

a base composition in a lower layer comprising at least one active agent present in an amount of about 0.01-50%, polyethylene glycol present in an amount of about 5-50% and a plaster present in an amount of about 40-90%;

wherein the cap composition in the compressed tablet provides a quick release of the active agent over a period of less than 10 minutes and the base composition in the compressed tablet provides an extended release of the active agent over a period of at least 30 days when placed in water.

2. A method of controlling or eliminating pests at an application site, the method comprising applying the composition of claim 1 to the application site.

3. The method of claim 2, wherein the dual-release tablet is placed in water to dissolve the polyethylene glycol and to hydrolyze the plaster into gypsum to form a gypsum matrix incorporated with the active agent;

and

wherein the gypsum matrix provides extended release of the active agent over a period of at least 30 days when placed in water.

4. The method of claim 2, wherein the pests comprise mosquitoes.

5. The tablet of claim 1, wherein the active agent comprises at least one of a pesticide, insecticide, herbicide, fungicide, nematicide, acaricide, bactericide, rodenticide, miticide, algicide, germicide, repellant, and nutrient.

6. The tablet of claim 1, wherein the base composition further comprises at least one additional component selected from a water-soluble binder, a non-water-soluble binder, and a lubricant;

and wherein the cap composition further comprises at least one additional component selected from a disintegrating agent, a water-soluble binder, and a non-water-soluble binder.

7. The tablet of claim 6, wherein the cap composition comprises a disintegrating agent comprising an effervescent.

8. The tablet of claim 1, wherein the base composition comprises Plaster of Paris and wherein the cap composition comprises dicalcium phosphate dihydrate, and at least one of citric acid and sodium bicarbonate or a combination thereof.

9. The tablet of claim 6, wherein the active agent is present in the cap composition in an amount of about 0.01-30% wt, the disintegrating agent is present in the cap composition in an amount of about 20-80% wt, and the non-water-soluble binder is present in the cap composition in an amount of about 2-40% wt.

10. The tablet of claim 6, wherein the active agent is present in the cap composition in an amount of about 0.5-10% wt, the plaster is present in the cap composition in an amount of about 10-20% wt, the disintegrating agent is present in the cap composition in an amount of about 20-75% wt, and the non-water-soluble binder is present in the cap composition in an amount of about 2-15% wt.

11. The tablet of claim 10, wherein the active agent is present in the base composition in an amount of about 0.5-12% wt, the plaster is present in the base composition in an amount of about 60-85% wt, and the polyethylene glycol is present in the base composition in an amount of about 8-20% wt.

12. The tablet of claim 1, wherein the active agent is present in the base composition in an amount of about 0.5-12% wt, the plaster is present in the base composition in an amount of about 60-85% wt, and the polyethylene glycol is present in the base composition in an amount of about 8-20% wt.

13. The tablet of claim 1, wherein base composition provides an extended release of the active agent over a period of at least 60 days when placed in water.

14. The tablet of claim 1, wherein the polyethylene glycol is in solid form and has a molecular weight from about 1000 to about 8500.

15. The tablet of claim 1, wherein the active agent comprises spinosad and the plaster comprises plaster of Paris.

16. A compressed tablet comprising a plaster present in an amount of about 40-90% wt, polyethylene glycol present in an amount of about 5-50% wt and at least one active agent present in an amount of about 0.01-50% wt and selected from the group consisting of a pesticide, insecticide, herbicide, fungicide, nematicide, acaricide, bactericide, rodenticide, miticide, algicide, germicide, repellant, and nutrient, wherein the compressed tablet has a hardness of at least about 200 Newtons, wherein the tablet provides an extended release of the active agent over a period of at least 30 days when placed in water.

17. The tablet of claim 16, wherein the tablet has a hardness of at least about 300 Newtons.

18. The tablet of claim 16, wherein the plaster comprises plaster of Paris.

19. The tablet of claim 16, wherein the tablet provides an extended release of the active agent over a period of at least 60 days when placed in water.

20. The tablet of claim 16, wherein the tablet provides an extended release of the active agent over a period of at least 150 days when placed in water.

21. The tablet of claim 16, wherein the plaster comprises plaster of Paris and the active agent comprises spinosad.

22. A method of controlling or eliminating pests at an application site, the method comprising applying the tablet of claim 16 to the application site.

23. The tablet of claim 16, wherein the active agent is present in an amount of about 5-10% wt, the plaster is present in an amount of about 60-85% wt, and the polyethylene glycol is present in an amount of about 5-30% wt.

24. The tablet of claim 23, wherein the tablet further comprises 0.1%-1% wt magnesium stearate.