Stable suspension concentrate formulation for water-soluble compounds

1. A stable water-based suspension concentrate composition comprising:

a) a water-soluble insecticide selected from the group consisting of N-cyanomethyl-4-(trifluoromethyl)nicotinamide and (EZ)-1-(6-chloro-3-pyridylmethyl)-N-nitroimidazolidin-2-ylidineamine;

b) a water-soluble salt selected from the group consisting of magnesium sulfate and sodium sulfate; and

c) water present as diluent in an amount of greater than about 50% by weight of the suspension concentrate;

wherein the insecticide is present in an amount of from about 1% to about 40% by weight of the suspension concentrate and the salt is present in an amount of from about 1% to about 35% by weight of the suspension concentrate, wherein the suspension concentrate is stable to Ostwald ripening.

2. The composition of claim 1 wherein the water-soluble insecticide is N-cyanomethyl-4-(trifluoromethyl)nicotinamide.

3. The composition of claim 2 wherein the water-soluble insecticide is present in a concentration of from about 10% to about 25% by weight of the suspension concentrate.

4. The composition of claim 1 wherein the water-soluble insecticide is (EZ)-1-(6-chloro-3-pyridylmethyl)-N-nitroimidazolidin-2-ylidineamine.

5. The composition of claim 4 wherein the water-soluble insecticide is present in a concentration of from about 10% to about 25% by weight of the suspension concentrate.

6. A composition of claim 1 wherein the water-soluble salt is magnesium sulfate and is present in an amount of from about 10% to about 30% by weight of the suspension concentrate.

7. The composition of claim 1 further comprising one or more additional components selected from the group consisting of a surfactant component, an antifoam agent, a preservative, a thickener or suspending agent, wherein the total amount of additional components in the composition is from about 0.001% to about 13% by weight of the suspension concentrate.

8. The composition of claim 7 wherein the surfactant component is present in a concentration of from about 0.1 to about 10% by weight of the suspension concentrate.

9. The composition of claim 7 wherein the anti-foam agent is present in an amount of from about 0.001% to about 1% by weight of the suspension concentrate.

10. The composition of claim 7 wherein the preservative is present in an amount of from about 0.001% to about 1% by weight of the suspension concentrate.

11. The composition of claim 7 wherein the thickener or suspending agent is present in an amount of from about 0.01% to about 1.0% by weight of the suspension concentrate.

12. A method for controlling unwanted insects comprising applying a composition of claim 1 to a locus where insects are present or are expected to be present.

13. The stable water-based suspension concentrate composition of claim 1 consisting essentially of:

a) N-cyanomethyl-4-(trifluoromethyl)nicotinamide present in an amount of from about 1% to about 40% by weight of the suspension concentrate;

b) magnesium sulfate present in an amount of from 10% to 30%;

c) a surfactant component present in a concentration of from 1% to 5%;

d) an anti-foam agent present in an amount of from 0.001% to 1%;

e) a preservative present in an amount of from 0.001% to 1%;

f) a thickener or suspending agent present in an amount of from 0.01% to 1.0%; and

g) water in an amount of greater than 50% by weight of the suspension concentrate.

14. A method for controlling unwanted insects comprising applying a composition of claim 13 to a locus where insects are present or are expected to be present.

15. The stable water-based suspension concentrate composition of claim 1 consisting essentially of:

a) (EZ)-1-(6-chloro-3-pyridylmethyl)-N-nitroimidazolidin-2-ylidineamine present in an amount of from about 1% to about 40% by weight of the suspension concentrate;

b) magnesium sulfate present in an amount of from 10% to 30%;

c) a surfactant component present in a concentration of from 1% to 5%;

d) an anti-foam agent present in an amount of from 0.001% to 1%;

e) a preservative present in an amount of from 0.001% to 1%;

f) a thickener or suspending agent present in an amount of from 0.01% to 1.0%; and

g) water in an amount of from about 37% to about 73% by weight of the suspension concentrate.

16. A method for controlling unwanted insects comprising applying a composition of claim 15 to a locus where insects are present or are expected to be present.