Patent ID: 6461518
Filing Date: 2002-10-08
Classification: C02F

Abstract:
A method for inhibiting the formation and deposition of silica and silicate compounds in water systems comprising adding to the water in the water system an effective amount of a polyaminoamide or polyetheramide condensation polymer obtained by the polymerization of:i) at least one carbonyl compound of formula â€ƒwherein R1 is selected from linear, cyclic or branched C1-C8 alkylene groups, aromatic groups, polycyclic groups and heterocyclic groups; Z and Zâ€² are independently selected from halogen, â€”OH, â€”OR2, and OC(O)R2; and R2 is selected from linear, cyclic or branched C1-C8 alkyl groups, aromatic groups, polycyclic groups or heterocyclic groups, with ii) at least one polyamine of formula H2Nâ€”Lâ€”NH2 wherein L is any combination of linear, cyclic or branched C2-C8 alkylene groups, aromatic groups, polycyclic groups and heterocyclic groups, where at least one of the alkylene, aromatic, polycyclic and heterocyclic groups are connected through NH or O, said polymer utilizing secondary amine and/or ether and amide functionality incorporated into the backbone of said polymer to inhibit said formation and deposition of said silica and silicate scale.