Dispersion comprising an emulsion having an aqueous phase with high ionic strength

The dispersion as claimed in the preceding claim, characterized in that the copolymer is selected from those whose mass ratio of hydrophilic block(s) to hydrophobic block(s) is between 50/50 and 90/10.

The dispersion as claimed in one of the preceding claims, characterized in that the hydrophilic blocks of the copolymer are obtained by employing, as hydrophilic monomer, at least one ionic or potentially ionizable hydrophilic monomer, more particularly anionic or cationic, and/or at least one nonionic hydrophilic monomer.

The dispersion as claimed in one of the preceding claims, characterized in that the anionic hydrophilic monomers contain at least one carboxylic, sulfonic, sulfuric, phosphonic, phosphoric, or sulfosuccinic function, or the corresponding salts.

The dispersion as claimed in one of the preceding claims, characterized in that the hydrophilic monomers are selected from acrylic acid or its salts, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid or its salts, and styrenesulfonic acid or its salts, vinylbenzyl trimethylammonium chloride, individually or in mixtures, or in the form of macromonomers.

The dispersion as claimed in one of the preceding claims, characterized in that at least one of the hydrophilic blocks is made up of one or more hydrophilic monomers or of a mixture of hydrophilic and hydrophobic monomer(s);

• the proportion by weight of hydrophobic monomer(s) representing more particularly less than 50% of the monomers forming said hydrophilic block, and preferably less than 20%.

The dispersion as claimed in one of the preceding claims, characterized in that the hydrophobic monomers are selected from the esters of acrylic acid with linear or branched C1-C4 alcohols such as methyl, ethyl, propyl and butyl acrylate, the vinyl esters such as vinyl acetate, styrene, α-methylstyrene.

The dispersion as claimed in one of the preceding claims, characterized in that at least one of the hydrophobic blocks is made up of one or more hydrophobic monomers or of a mixture of hydrophilic and hydrophobic monomer(s);

• the proportion by weight of hydrophilic monomer(s) representing more particularly less than 50% of the monomers forming said hydrophobic block.

The dispersion as claimed in one of the preceding claims, characterized in that the copolymer is such that the number-based molar mass of each block is between 500 and 100·103 g/mol, preferably between 103 and 50·103 g/mol.

The dispersion as claimed in one of the preceding claims, characterized in that the copolymers are of linear form.

The dispersion as claimed in one of the preceding claims, characterized in that the copolymers are diblocks.

The dispersion as claimed in one of the preceding claims, characterized in that the content of copolymer in the dispersion represents more particularly at least 1 wt. % relative to the organic phase, advantageously from 2 to 20 wt. % relative to the organic phase, and preferably between 2 and 10 wt. % relative to the organic phase.

The dispersion as claimed in one of the preceding claims, characterized in that the concentration of salt soluble in the aqueous phase is greater than 0.8 mol/l, advantageously greater than or equal to 1 mol/l, preferably greater than or equal to 2 mol/l.

The dispersion as claimed in one of the preceding claims, characterized in that the soluble salt is selected from the active substances that can be used in the area of plant protection.

The dispersion as claimed in one of the preceding claims, characterized in that it comprises a solid dispersed in the aqueous phase.

The dispersion as claimed in one of the preceding claims, characterized in that the organic phase of the emulsion is selected from the organic compounds that are in a liquid form at the temperature of preparation of the dispersion, or alternatively from those that are liquid at the temperature of use of said dispersion, or even these two possibilities simultaneously.

The dispersion as claimed in one of the preceding claims, characterized in that the organic phase can contain one or more active substances that are in a form that is soluble in said organic phase or alternatively are dissolved in the latter, or it can even constitute an active substance itself.

The dispersion as claimed in one of the preceding claims, characterized in that the proportion by weight of organic phase in the dispersion represents 5 to 50 wt. %, preferably 10 to 30 wt. %.

The dispersion as claimed in one of the preceding claims, characterized in that the dispersion contains at least one surfactant that is soluble in the aqueous phase.

The dispersion as claimed in the preceding claim, characterized in that the surfactant is selected from the alkylpolyglucosides.

The dispersion as claimed in the preceding claim, characterized in that the content of surfactant represents at most 50 wt. % of the combined weight of surfactant+copolymer.

The dispersion as claimed in one of the preceding claims, characterized in that the aqueous phase of the dispersion contains a biological activator of the active substance or substances in the form of water-soluble salt.

The dispersion as claimed in the preceding claim, characterized in that the content of biological activator represents up to 40 wt. % of the active substance or substances.

The dispersion as claimed in one of the preceding claims, characterized in that the dispersion is in a dry form.

A method of preparation of a dispersion as claimed in one of the preceding claims, characterized in that an aqueous solution of copolymer, of soluble salt, is prepared, then the organic phase, possibly containing an active substance, is added progressively.

The method of preparation as claimed in the preceding claim, characterized in that the dispersed solid is added to the emulsion, once the latter is obtained.

The method of preparation as claimed in the preceding claim, characterized in that an additional quantity of copolymer is added to the dispersion once obtained, in such a way that the total content of the copolymer, in dry weight, is between 10 and 20 wt. % relative to the organic phase.