AGENTE PROTECTOR DE LA MADERA, EXENTO DE CROMO

EL MEDIO DE PROTECCION DE MADERA SEGUN LA INVENCION LIBRE DE CROMO CONTIENE SAL DE COBRE, ALCANOLAMINA Y ADICIONALMENTE POLIMEROS Y BORATO AMONICO CUATERNARIO. OBTENIENDOSE MEDIANTE LA TRANSFORMACION AL MISMO TIEMPO DE AMINAS CON OXIDO ETILENO U OXIDO PROPILENO Y ACIDO BORICO. A water-soluble chromium-free wood preservative comprising at least one copper salt and an alkanolamine and a polymeric quaternary ammonium borate formed by simultaneous reaction of (A) an amine selected from the group consisting of (* CHEMICAL STRUCTURE *) I (* CHEMICAL STRUCTURE *) II wherein R1 is alkyl or alkenyl of 8 to 22 carbon atoms or when R2 and R3 are -(C2H4O)x-H or -(C3H6O)x-H, R1 is alkyl of 1 to 22 carbon atoms, R2 is selected from the group consisting of hydrogen, alkyl of 1 to 22 carbon atoms, -(C2H4O)x-H, -(C3H6O)x-H and -CH2-CH2-NH2, R3 is selected from the group consisting of hydrogen, -(C2H4O)x-H, -(C3H6O)x-H and CH2-CH2-CH2NH2, R4 and R6 are individually alkyl of 1 to 4 carbon atoms or -(CH2H4O)x-H or -(C3H6O)x-H, R5 and R2 are individually -(C2H4O)x-H or - (3H6O)x-H, A is selected from the group consisting of -(CH2)n-, -(CH2-CH2OCH2)n- and -(CH2CH2NHCH2CH2)n-, x is an integer of 1 to 55 and n is an integer of 1 to 20, (B) 2 to 20 moles of ethylene oxide or propylene oxide and (C) 0.6 to 1.5 moles of a member of the group consisting of boric acid, boric acid salts and boric acid esters per mole of nitrogen equivalent of (A) useful for impregnating wood exposed to weather conditions or installed in contact with soil.