Pesticidal paste compositions

Details Pesticidal paste compositions Pesticidal paste compositions

1996-09-26

1999-08-31

Levy, Neil S.

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Biocides; animal or insect repellents or attractants

424406, 424408, 424409, 424421, 424484, 424485, 424486, 424487, 424488, 424 44, A01N 2508

Patent

active

059451130

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to new pesticide formulations and their preparation process.
A subject of the invention is pesticide formulations being presented in the form of pastes containing: pure active ingredient or in solution in a solvent,
The formulations of the invention are presented in the form of a thick paste having the property of being effervescent and possessing a microporous structure which gives it very good dispersion in water.
This paste can be presented inside a plastic sachet which is soluble in water, as extruded granules or in blister packs. The last two presentations require a drying operation.
This paste is a composition which possesses a very low viscoelasticity coefficient, it is not a colloidal solution like a gel, but results from an absorption by a solid of a liquid until saturation, the granulometry of the solid particles being comprised between 5 and 40.mu..
The active ingredient is in solution in a solvent which is not very volatile and the emulsifying agents contained in this solvent allow the preparation to release the active ingredient in the form of an emulsion after its dilution in water.
The formulations of the invention possess a microporous structure which facilitates their dispersion in water at their time of use. This structure is obtained by bringing about a gaseous release inside the paste when it is prepared. The gas is released by the reaction of the micropore generators and the effervescent agent.
One of the advantages of the invention is to present formulations such as concentrated suspensions or emulsifiable concentrates, which are usually liquid, in the form of a solid or a paste.
Another advantage is to thus avoid any risk of accidental spillage during storage, transportation or handling of the product.
Another advantage is to avoid product losses on the walls of packaging during use.
Another advantage is, in the case where the paste is contained in a water-soluble sachet, to provide a product whose remaining packaging after use contains no trace of active ingredient and whose loss in the case of accidental opening or tearing is nil unlike a liquid or a gel.
The active ingredient is a liquid or solid pesticide, soluble or insoluble in water.
It can be an insecticide, an acaricide, a fungicide or a growth regulator.
As an effervescent agent, a mixture can be used of citric acid and an alkali or alkaline-earth carbonate or hydrogen carbonate, for example sodium or potassium carbonate or calcium carbonate or sodium hydrogen carbonate; acids other than citric acid can be used, for example ascorbic acid or adipic acid.
As a micropore-generating agent, a glycol can be used which reacts slowly with the effervescent agent and causes a carbon dioxide release inside the paste, it is preferably monopropylene glycol.
A more particular subject of the invention is the pesticide formulations containing from 0 to 20% of effervescent agents, or also the formulations containing from 30 to 50% of effervescent agents.
A particular subject of the invention is the formulations containing in addition 3 to 10% of wetting agents or also the formulations containing in addition 20 to 40% of wetting agents.
The wetting agent can be a sodium salt of an aliphatic acid or a lignosulphonate.
A particular subject of the invention is the formulations containing between 5 and 40% of mineral filler or organic filler which can optionally be substituted for the wetting agent.
The mineral fillers must possess a sufficient absorbent power to retain the liquid constituents of the formulation without desorption; they are preferably silicas, for example silica of aerosil or zeosil type or clays such as argirec, vercoryl, or also anhydrous aluminium, potassium or sodium silicates or finally sodium borate.
The organic fillers can be for example chosen from celluloses, starch or corn derivatives, urea, lactose and sugars, polyvinylpyrolidone.
A more particular subject of the invention is the pesticide formulations containing in addition between
The solvent used is very important for the success of th

REFERENCES:
patent: 4765984 (1988-08-01), Vellekoop et al.
patent: 5232701 (1993-08-01), Ogawa et al.
patent: 5500213 (1996-03-01), Roe et al.
patent: 5516520 (1996-05-01), Yang et al.
Pressman in Water Quality/California p. 355 1968.
Websters Dictionary--Paste p. 988.

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