composition, method of preparing the composition, use of the terpolymer, method of controlling phytopathogenic fungi and / or unwanted plant growth and / or unwanted insect or mite attack and / or regulating plant and seed growth. a composition comprising an active agrochemical substance and a random terpolymer comprising monomers i, ii, iii and optionally additional polymer incorporated monomers, wherein monomer i comprises an olefinically unsaturated monomer comprising a sulfonic acid group and / or one of its salts, monomer ii comprises (meta) acrylamide and / or one of its unsubstituted derivatives and monomer iii comprises a C 3-8 C-8-monoethylenically unsaturated carboxylic acid, one of its anhydrides and / or salts. The present invention further relates to a method of preparing the present composition； the use of the present composition to disperse active agrochemicals； a method of controlling phytopathogenic fungi and / or unwanted plant growth and / or unwanted insect or mite attack and / or for regulating plant growth, wherein the composition is maintained to act on the corresponding pests, their environment or crop plants to be protected against the corresponding pest, soil and / or unwanted plants and / or rising crop plants and / or their environment； and, additionally, the seed comprising the composition.composição, método de preparação da composição, uso do terpolímero, método de controle de fungos fitopatogênicos e/ou crescimento vegetal indesejado e/ou ataque indesejado de insetos ou ácaros e/ou regulagem do crescimento das plantas e semente a presente invenção refere-se a uma composição que compreende uma subtância agroquímica ativa e um terpolímero aleatório que compreende os monômeros i,ii,iii e, opcionalmente, monômeros adicionais incorpprados ao polímero, em que o monômero i compreende um monômero olefinicamente insaturado que compreende um grupo de ácido sulfônico e/ou um de seus sais, o monômero ii compreende (meta) acrilamida e/ou um de seus
