C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/297
C08F 8/00 (2006.01) C08F 8/44 (2006.01)
Patent
CA 1254344
66530-426 ABSTRACT A high temperature, pressurized process is described to synthesize substituted carboxylated modified acrylamide polymers represented by the structure: Image wherein M is chosen from hydrogen, lower alkyl (C1-C4) groups, alkali metal, alkaline earth metal, primary, secondary or tertiary amine salts, quaternary amines and ammonium ion, and mixtures thereof; R' is a multi-covalent hydrocarbonaceous bridging group having from one to sixteen carbon atoms and being chosen from linear alkyl, branched alkyl, cyclic, aromatic, heterocyclic and olefinic groups, and mixtures thereof (functional groups); X is chosen from -SO3M - PO3M2, -COOR' -OR, -R'NR"2, -R'N+R3 Hal (OCH2?H) OR, and mixtures thereof; wherein R" is (CH2?HO)pR, R and mixtures thereof, and R is individually chosen, at each occurrence, from H and lower alkyl (C1-C4) groups; and wherein a, b, and d are integers with the following relationships; 66530-426 a/b is from zero to 100 b/d is from 0.01 to 100 a/d is from zero to 100, and the sum of a+b+d is sufficient to provide a molecular weight of at least 1000, and the ratio of d:(a + b) is from 20:1 to 1:100; and wherein p ranges between 1 and 16, and m ranges between 0 and 16, and n ranges between 1 and 16, provided that when m is zero, the sum of m + n is from 1 to 20. These water soluble polymers are useful in various water treatment procedures, such as heat exchanger scale inhibition.
529033
Nalco Chemical Company
Smart & Biggar
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