BR-112021007479-B1 - Dithiocarbamate oil dispersion, and a method for treating plants, crops, and/or fields.

BR112021007479B1BR 112021007479 B1BR112021007479 B1BR 112021007479B1BR-112021007479-B1

Abstract

Oily dispersion of dithiocarbamate, and method for treating plants, crops and/or fields. Oily dispersion of dithiocarbamate comprising a polyamide obtained by the reaction of a fatty acid, a polyamine and a di- or tricarboxylic acid in a specific molar ratio and use thereof in agriculture.

Inventors

Filippo Quaglia
Federico DE PELLEGRINI
Giovanni Floridi
Giuseppe Li Bassi

Assignees

LAMBERTI SPA

Dates

Publication Date: 20260310
Application Date: 20191119
Priority Date: 20181123

Claims (5)

1. An oily dispersion of dithiocarbamate, characterized in that it comprises: 5.0 to 60% by weight (% by weight) of at least one fungicide from the dithiocarbamate family, 10 to 90% by weight of an oil chosen from paraffin oils, mineral oils, vegetable oils or products of the transesterification thereof and mixtures thereof, and 0.05 to 10% by weight of a polyamide obtained by reacting in a first step: a) one mole of a polyamine having n amino groups with interchangeable hydrogens, wherein n is an integer ranging from 3 to 4, and wherein said polyamine a) is a polyalkylene polyamine of formula I:H2N[(CH2)xNH]yH I where x is an integer ranging from 1 to 6 and y is an integer ranging from 2 to 3, with b) 1 to n-1 moles of an aliphatic monocarboxylic acid a) Saturated or unsaturated C6-C30 monocarboxylic acid or an ester thereof, wherein the saturated or unsaturated aliphatic C6-C30 monocarboxylic acid b) is a mixture of saturated or unsaturated aliphatic C12-C22 monocarboxylic acids; to obtain an aminoamide having an acid number below 30 mgKOH/g and subsequently reacting the remaining amino groups carrying exchangeable hydrogens of the aminoamide with: c) 0.3 to 1.0 mol of a C3-C8 dicarboxylic acid or the corresponding anhydride for each mol of remaining amino groups; to obtain a polyamide with a total amine value below 60 mgKOH/g.
2. Dithiocarbamate oil dispersion according to claim 1, characterized in that it comprises: 7 to 60% by weight of at least one fungicide from the dithiocarbamate family; 20 to 80% by weight of an oil; and 0.1 to 5.0% by weight of said polyamide.
3. Dithiocarbamate oil dispersion according to claim 1, characterized in that said polyamine a) is a polyalkylene polyamine of formula I in which x is 2, i.e. a polyethylene amine.
4. Dithiocarbamate oil dispersion according to claim 1, characterized in that it further comprises 5 to 30% by weight of at least one surfactant.
5. Method for treating plants, crops or fields, characterized in that it comprises the steps of: i. providing an oily dispersion of dithiocarbamate as defined in any one of claims 1 to 4; ii. diluting said oily dispersion of dithiocarbamate with water or an aqueous solution of agronomic compounds to produce a sprayable composition; iii. applying to the plants, crops or fields an effective amount of said sprayable aqueous composition.

Description

TECHNICAL FIELD [001] The present invention relates to a dithiocarbamate oily dispersion comprising a polyamide obtained by the reaction of a fatty acid and a di- or tricarboxylic acid with a polyamine in a specific molar ratio. [002] This invention also relates to the use in agriculture of the dithiocarbamate oil dispersion comprising the polyamide mentioned above. PREVIOUS TECHNIQUE [003] Dithiocarbamates (DTCs) are mostly from the important group of organic fungicides for controlling plant diseases. DTCs are distinguished by a broad spectrum of activity against various plant pathogens, low acute mammalian toxicity, and low production costs. Due to their known chemical instability at elevated temperatures in the presence of moisture, dithiocarbamate active substances are, as a rule, formulated as solid formulations, such as powders and dispersible granules, or as oil dispersions. [004] Agrochemical oil dispersions (ODs) are stable suspensions of agrochemical active ingredients, such as pesticides and crop protection chemicals, in organic fluids and are usually intended for dilution with water before use. Oil dispersions are particularly useful for formulating oil-insoluble solid active ingredients and for formulating compounds that are unstable in aqueous compositions, such as dithiocarbamates. [005] A disadvantage of DO formulations, particularly dedithiocarbamates, is that such formulations are not stable for a sufficient amount of time and exhibit phase separation during storage. Thus, storage even at ambient temperatures often leads to aggregation effects, viscosity formation, gel formation, or pronounced sedimentation of the phase placed in suspension. In the worst cases, the effects are irreversible, i.e., even strong shear, for example by agitation, cannot re-homogenize the formulation. [006] A common method for solving this problem is usually to add a stabilizer to the dispersions that can act as a thickener by increasing the viscosity of the system and/or can act as a dispersant by reducing the sedimentation rate of the particles. [007] Typical stabilizers for dry organic systems include organic clays, such as Bentone®. Organic clays are manufactured from natural smectite, hectorite or montmorillonite clays by reacting the hydrophilic clay with quaternary ammonium compounds, so that it becomes organophilic and therefore compatible with non-aqueous media. [008] Other known stabilizers are surfactants, vegetable oil derivatives, silica derivatives and synthetic polymers. [009] For example, WO 2000/072681 describes an essentially anhydrous dithiocarbamate liquid formulation comprising: at least one active ingredient from the dithiocarbamate class, an essentially anhydrous oil phase, a polyhydroxystearic acid or a derivative thereof and/or an alkyl or alkenyl glyceryl ether ethoxylate, as stabilizers, and optionally an anionic surfactant. [0010] US patent 2009/202648 describes a dispersion comprising: a dispersed phase comprising ethylene bis(dithiocarbamate); a continuous phase comprising a water-immiscible liquid; and, as a stabilizer, a metallic polyacrylate having a molecular weight of about 150 to about 15,000 Daltons. [0011] US patent 2011/237591 refers to plant protection fungicide formulations comprising: a) dimethomorph and b) at least one dithiocarbamate, formulated as a concentrated oil suspension in a liquid organic diluent and in the presence of at least one surfactant. Silicates, modified silicates, organic thickeners, for example those based on hydrogenated fatty acids and fatty acid derivatives, and thickeners based on synthetic polymers are mentioned among suitable stabilizers. [0012] Document WO 2012/167322 refers to an agricultural oil-based suspension formulation comprising an active ingredient suspended in finely divided form in an oil; and, as a stabilizer, at least one surfactant selected from a polyalkylene glycol-fatty acid condensate or a polyalkylene glycol ether fatty acid condensate. Dithiocarbamates are mentioned among the active ingredients. [0013] Document WO 2016/153913 describes an agrochemical formulation comprising a pesticide or mixture of pesticides, including dithiocarbamates, and an adjuvant composition comprising an oil and a maleated natural oil derivative obtained from the reaction of a maleated natural oil and a compound derivative comprising at least one polyoxyalkylene glycol, monoalkyl polyoxyalkylene glycol, polyetheramine, alkylene amine, alkanolamine, etc. Polyamines, such as ethylenediamine, diethylenetetramine, triethylenediamine and triethylenetetramine, are included among the alkyleneamines. [0014] Unfortunately, all of these stabilizers show disadvantages and problems that reduce their applicability and performance. [0015] They do not always communicate sufficient stability for dispersions across the desired temperature range and for a sufficient time. [0016] Since they can significantly increase the viscosity of the dispersion, they must be dose