Alkyl-allylphosphonate copolymer used for boiler water treatment
AssigneeBetz Laboratories, Inc.
InventorsScott M. Boyette, Alan E. Goliaszewski
Life of this patent
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Abstract
A water soluble isopropenylphosphonic acid copolymer composition and method of use thereof are disclosed. The copolymer comprises repeat units (a) of the formula: ##STR1## wherein X=OH or OM, wherein M is a cation, and repeat units (b) of the formula: ##STR2## wherein R.sub.1 and R.sub.2 are independently hydrogen, C.sub.1-10 linear or branched alkyl, phenyl or alkyl substituted phenyl. The copolymers are effective in inhibiting the precipitation of scale forming salts and also act to inhibit corrosion in boiler water systems.
Claims14
A method of controlling the deposition of scale imparting precipitates on the structural parts of a boiler water system comprising adding to said boiler water system an effective amount for the purpose of a water soluble copolymer consisting essentially of repeat unit moieties (a) and (b), said repeat unit moiety (a) having the structure:
- ##STR6## wherein X=OH or OM, wherein M is a cation, said repeat unit moiety (b) having the structure:
- ##STR7## wherein R.sub.1 and R.sub.2 are independently hydrogen, C.sub.1-10 linear or branched alkyl, phenyl, or alkyl substituted phenyl, said copolymer having a molar ratio of a:b of from about 3:1 to about 0.5:1.
A method of transporting and removing iron from a boiler water system comprising adding to said boiler water system an effective amount for the purpose of a water soluble copolymer consisting essentially of repeat unit moieties (a) and (b), said repeat unit moiety (a) having the structure:
- ##STR8## wherein X=OH or OM, wherein M is a cation, said repeat unit moiety (b) having the structure:
- ##STR9## wherein R.sub.1 and R.sub.2 are independently hydrogen, C.sub.1-10 linear or branched alkyl, phenyl, or alkyl substituted phenyl, said copolymer having a molar ratio of a:b of from about 3:1 to about 0.5:1.
Dependencies are inferred from the claim text.