C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
148/17, 134/39
C02F 5/10 (2006.01) C02F 5/12 (2006.01) C23F 11/08 (2006.01)
Patent
CA 1234033
Abstract of The Disclosure A method for inhibiting calcium phosphate or calcium phosphonate deposition in water systems by the use of water soluble copolymers and terpolymers is disclosed. The copolymers have the structural formula: Image wherein R1 is H or lower alkyl (C1-C3); R2 is OH, OM, or NH2; M is a water soluble cation; R3 is a hydroxy substituted alkyl or alkylene radical having from 1 to about 6 carbon atoms or a non-substituted alkyl or alkylene radical having from 1 to 6 carbon atoms; X is an anionic radical; Z is H or hydrogens or a water soluble cation or cations which together counterbalance the valence of X, and a is 0 or 1. These copolymers, and terpolymeric derivatives, func- tion to provide a passivated oxide film along treated metal surfaces when used conjointly with a water soluble orthophosphate source.
464527
Betzdearborn Inc.
Borden Ladner Gervais Llp
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