Aqueous Insecticidal Compositions and the Use Thereof for Protecting Lignocellulose-Containing Materials

• US 20080138371A1
• Filed: 03/08/2006
• Published: 06/12/2008
• Est. Priority Date: 03/09/2005
• Status: Active Grant

• Current Assignee: BASF AG (BASF SE)
• Original Assignee: BASF AG (BASF SE)
• Inventors: Haentzschel, Dirk, Amrhein, Patrick, Kleist, Gunnar, Schopke, Holger, Habicht, Joerg
• Granted Patent: US 8,999,358 B2
• Time in Patent Office: Days
• US Class Current: 424/405
• 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 25/04 Dispersions, emulsions, suspoemulsions, suspension concentrates or gels foams A01N25/16
• CPC Class Codes: A01N 25/26 in coated particulate form
• CPC Class Codes: A01N 25/28 Microcapsules or nanocapsules
• CPC Class Codes: A01N 43/36 five-membered rings
• CPC Class Codes: A01N 53/00 Biocides, pest repellants or attractants, or plant growth regulators containing cyclopropane carboxylic acids or derivatives thereof
• CPC Class Codes: B27K 3/007 employing compositions comprising nanoparticles
• CPC Class Codes: B27K 3/15 Impregnating involving polymerisation including use of polymer-containing impregnating agents macromolecular compounds derived from lignocellulosic materials C08H; compositions of lignin-containing materials C08L97/02

Abstract

The invention relates to aqueous insecticidal compositions embodied in the form of an aqueous polymer fine particle dispersion containing at least one type of organic insecticidal active substance whose water solubility is equal to or less than 5 g/l at 25° C./1013 mbar and a polymer particle average size, determined by dynamic light scattering, is equal to or less than 300 nm, wherein the polymer particles containing at least one insecticidal active substance exhibit a cationic surface charge and the aqueous dispersion of active substance containing polymer particles is obtained by radical aqueous emulsion polymerisation of an ethylenically unsaturated monomer composition M, in which said ethelenycally unsaturated monomer M contains at least one type of insecticidal active substance in a dissolved form. The use of the inventive aqueous insecticidal compositions for protecting lignocellulose-containing materials, in particular wood, against infest pest attacks is also disclosed.

Claims

1. An insecticide composition in the form of an aqueous dispersion of finely divided polymer particles which comprise at least one insecticidal organic active ingredient with a solubility in water of not more than 5 g/l at 25°

C. at 1013 mbar and which have a mean particle size, determined by dynamic light scattering, of not more than 500 nm, where the polymer particles which comprise the at least one insecticidal active ingredient have a positive surface charge and where the aqueous dispersion of the active-ingredient-comprising polymer particles is obtainable by subjecting a monomer composition of ethylenically unsaturated monomers M, in which the ethylenically unsaturated monomers M comprise the at least one insecticidal active ingredient in dissolved form, to radical aqueous emulsion polymerization.

2. The insecticide composition according to claim 1, wherein the monomers M comprise from 0.1 to 20% by weight based on the total amount of the monomers M of at least one monoethylenically unsaturated monomer M-k which has at least one cationic group and/or at least one group which is capable of protonation in an aqueous environment.

3. The insecticide composition according to claim 2, wherein the monomer M-k is selected among monomers of the general formula I

4. The insecticide composition according to claim 1, wherein the aqueous dispersion of the active-ingredient-comprising polymer particles is obtainable by radical aqueous emulsion polymerization of the monomer composition in the presence of a cationic surface-active substance.

5. The insecticide composition according to claim 1, wherein the monomers M comprise from 60 to 99% by weight, based on the total amount of the monomers M, of at least one neutral monoethylenically unsaturated monomer M1 with a solubility in water of not more than 60 g/l at 25°

C.

7. The insecticide composition according to claim 1, wherein the polymer has a glass transition temperature T_G of at least 10°

C.

8. The insecticide composition according to claim 1, comprising the at least one insecticidal active ingredient in an amount of from 0.1 to 50% by weight, based on the weight of the monomers M employed for the preparation of the polymer.

9. The insecticide composition according to claim 1, wherein the insecticidal active ingredient is selected among pyrethroids, carbamates, organo(thio)phosphates, arthropod growth regulators, chlorfenapyr and neonicotinoids.

10. The insecticide composition according to claim 1, wherein the polymer particles comprise the at least one insecticidal active ingredient as the sole active ingredient.

11. The insecticide composition according to claim 1, wherein the volatile organic components amount to less than 1% by weight, based on the total weight of the composition.

12. The insecticide composition according to claim 1, wherein the solids amount to from 10 to 60% by weight.

13. The process for the preparation of an insecticide composition according to claim 1, comprising a radical aqueous emulsion polymerization of a monomer composition of ethylenically unsaturated monomers M, wherein the ethylenically unsaturated monomers M comprise the at least one insecticidal active ingredient in dissolved form, the monomers M comprising at least one monoethylenically unsaturated monomer M-k which has at least one cationic group and/or at least one group which is capable of being protonated in an aqueous environment and/or the emulsion polymerization taking place in the presence of at least one cationic surface-active substance.

14. A pulverulent insecticide composition, obtainable by drying an aqueous insecticide composition according to claim 1.

15. The use of an aqueous insecticide composition according to claim 1 or of a pulverulent composition according to claim 14 for controlling harmful insects.

16. The use of an aqueous insecticide composition according to claim 1 or of a pulverulent insecticide composition obtainable by drying an aqueous insecticide composition for protecting lignocellulosic materials against attack by harmful insects.

17. A method for protecting lignocellulosic materials against attack or destruction by harmful insects, comprising the treatment of the lignocellulosic material with an aqueous insecticide composition according to claim 1 and/or with a pulverulent insecticide composition obtainable by drying an aqueous insecticide composition.

18. The method according to claim 16, wherein the lignocellulosic material is timber.

19. The insecticide composition according to claim 2, wherein the aqueous dispersion of the active-ingredient-comprising polymer particles is obtainable by radical aqueous emulsion polymerization of the monomer composition in the presence of a cationic surface-active substance.

20. The insecticide composition according to claim 3, wherein the aqueous dispersion of the active-ingredient-comprising polymer particles is obtainable by radical aqueous emulsion polymerization of the monomer composition the presence of a cationic surface-active substance.

6. The insecticide composition according to claim 6, wherein the monomers M1 are selected among vinyl-aromatic monomers, C₂-C₁₀-alkyl acrylates and C₁-C₁₀-alkyl methacrylates.