A preservative formulation of wood comprising a biocide which is a copper ion or zinc complexed with an amine compound selected from the group consisting of ammonia, a water soluble amine or alkanolamine and an aminocarboxylic acid, and a cationic polymer selected from the group consisting of: (i) a compound of formula (I) ** ** formula (ii) a compound of formula (II) ** ** Formula and (iii) a compound of formula (III) ** ** Formula wherein: n> = 3 to 5000 n1> = 0, 1 or 2 n2> = 0 or 1 n3> = 2 or 3 and when n> = 3 the nitrogen atom carries a positive charge and X- counterion is present the Rx groups which may be the same or different, are hydrogen or a straight chain, branched or cyclic alkenyl, alkynyl, alcanoxilo, aryl, - (C> = O) H, - (C> = O) Rn, -CO2H, -CO2Rn, -CH2CO2H, -CH2CO2Rn, CH2NRnRn, - (C> = O) NRnRn, -CN, - (CH2) n4-O-Rn, in which: Rn groups, which may be identical or different They are hydrogen or a straight chain, branched or cyclic alkenyl, alkynyl, or aryl alconoxilo n4> = 2 or 3 Ry is of the formula (IV) ** ** Formula wherein Rz> = H or OH a> = 0 to 10 b> = 0 or 1 c> = 0 to 10 d> = 0 to 10 X- is any anion selected from chloride, bromide, iodide, fluoride, sulfate, phosphate, propionate and lactate especially carboxylate, carbonate, bicarbonate, nitrate, nitrite, hydroxide, cyanide and * represents the bonds connecting the repeating units in the polymer backbone.Una formulación conservante de la madera que comprende un agente biocida que es un ión de cobre o de cinc complejado con un compuesto aminado seleccionado del grupo que consiste en amoníaco, una amina soluble en agua o alcanolamina y un ácido aminocarboxílico, y un polímero catiónico seleccionado del grupo que consiste en: (i) un compuesto de la fórmula (I) **Fórmula** (ii) un compuesto de la fórmula (II) **Fórmula** y (iii) un compuesto de la fórmula (III) **Fórmula** en las que: n >= 3 a 5000 n1 >= 0, 1 ó 2 n2 >= 0 ó 1 n3 >= 2 ó 3 y cuando n >= 3 el átomo de nitrógeno lleva una carga positi
