Patent ID: 9376650
Filing Date: 2016-06-28
CPC Classification: C11D

Claim Text:
1. A method of scale inhibition in aqueous medium due to metal ion interferences comprising adding to the water of from 0.1 to 100000 parts per million (ppm) of a phosphonate compound selected from the group consisting of: (a) a phosphonate compound of the general formula: wherein B is a phosphonate containing moiety having the formula: wherein X is selected from the group consisting of C Z is a C M is selected from the group consisting of alkali, earth alkali and ammonium ions and from protonated amines; W is selected from the group consisting of H, ZPO aromatic hydrocarbon moiety; and from [A-O] K is ZPO and wherein T is a moiety selected from the group consisting of: wherein M, Z, W and X are as defined above; U is selected from the group consisting of linear, branched, cyclic or aromatic C (b) linear or branched hydrocarbon moieties having from 6 to 2·10