Solid pesticide compositions with extended stability
View Patent ↗Compositions and methods are disclosed which greatly improve the shelf-life of pesticidal agents and especially insecticides. The tendency of the composition to segregate from the solid components is minimized, which improves uniformity throughout the product.
1. A pesticide composition, said pesticide composition comprising:
a pesticidal agent on a solid carrier, wherein the pesticidal agent is methoprene;
a biopolymer;
an effective amount of a plaster of paris to harden said composition, wherein said pesticidal agent maintains certified limits for at least 12 months; and wherein N is the nominal concentration of said pesticidal agent and the certified limits are as follows:
Upper Limit
Lower Limit
N ≦ 1.0%
N + 10% N
N − 10% N
1.0% < N ≦ 20.0%
N + 5% N
N − 5% N
20.0% < N ≦ 100.0%
N + 3% N
N − 3% N.
2. The composition of claim 1 , wherein the ratio of pesticide to solid carrier is from about 0.001 to about 30.0 w/w.
3. The composition of claim 2 , wherein the ratio of pesticide to solid carrier is from about 0.01 to about 10.0 w/w.
4. The composition of claim 1 , further comprising a surfactant.
5. The composition of claim 4 , wherein said surfactant is a member selected from the group consisting of a nonionic ethoxylated alcohol and an ethoxylated substituted phenol.
6. The composition of claim 1 , wherein said composition maintains certified limits for at least 24 months.
7. The composition of claim 1 , wherein said solid carrier is selected from the group consisting of silica gel, sand, carbon, and combinations thereof.
8. The composition of claim 7 , wherein said solid carrier is carbon.
9. The composition of claim 1 , wherein said biopolymer is a polysaccharide.
10. The composition of claim 9 , wherein said polysaccharide is a member selected from the group consisting of acacia, agar, alginate, guar, locust bean, tragacanth, xanthan, and combinations thereof.
11. The composition of claim 1 , wherein said ratio of pesticidal agent to biopolymer is from about 1000:1 to about 1:1 w/w.
12. The composition of claim 11 , wherein said ratio of pesticidal agent to biopolymer is from about 500:1 to about 1:1 w/w.
13. The composition of claim 11 , wherein said ratio of pesticidal agent to biopolymer is from about 75:1 to about 1:1 w/w.
14. The composition of claim 1 , further comprising an antioxidant.
15. The composition of claim 14 , wherein said antioxidant is selected from the group consisting of Vitamin E, Vitamin A palmitate, ethoxyquin, propyl gallate, butylated hydroanisole (BHA), butylated hydroxytoluene (BHT), and combinations thereof.