Field of the Invention
The invention relates to an insecticidal water-in-oil (W/O) formulation with at least one insecticidal active substance and at least one burning salt and to the preparation of this formulation. The formulation according to the invention is particularly suitable for the treatment of suitable supports, in particular of paper supports, in an economical one-step process with the aid of conventional application processes. In addition, the present invention relates to insecticidal, smoulderable products which can be prepared by treating a support with the formulation according to the invention.
Description of Related Art
US-A-2009/0163582 describes a water-in-oil (W/O) formulation in which a polyglycerol fatty acid ester or a sorbitan fatty acid ester is employed as emulsifier, a pesticide, for example a pyrethroid, as active substance and acetyl ester, a methyl ester, an acetyl tributyl citrate, a white mineral oil or a combination of these as the solvent. This formulation takes the form of an aerosol formulation for the end user.
WO-A-2007/131679 describes a paper impregnated with an insecticidal active substance. The paper here is prepared in a two-step process in which the paper is first pretreated with an aqueous 6% strength potassium nitrate solution and then dried, and then, in a further step, impregnated with active substance solution. WO-A-2007/131679 does not disclose any formulation in which the paper can be treated in a one-step process, in particular with an insecticidal active substance and the potassium nitrate salt.
WO-A-2011/092722 describes a paper impregnated with an insecticidal active substance, which paper, again, is prepared in a two-step process. Analogously to the process of WO-A-2007/131679, the paper is first treated with a potassium nitrate before being dried and then impregnated with the active substance.