Scale inhibitors

Compositions – Leather or fur treating


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252180, 210699, E21B 4328, C02F 514




A scale inhibiting composition comprises the combination of (a) a copolymer of an alkene, preferably a branched chain alkene, and an unsaturated dicarboxylic acid or anhydride, in acidic or neutralized form, and (b) an organic polyphosphonic acid or salt.
A preferred composition contains the sodium salt of a copolymer of isobutene and maleic anhydride and 1-hydroxyethyl-1,1-diphosphonic acid.
The compositions may be used in secondary or tertiary oil recovery, desalination of sea water and the softening of boiler feed water.

patent: 2723956 (1955-11-01), Johnson
patent: 3214454 (1965-10-01), Blaser et al.
patent: 3483925 (1969-12-01), Slyker
patent: 3532167 (1970-10-01), Noe et al.
patent: 3600524 (1986-07-01), Cuisia et al.
patent: 3663448 (1972-05-01), Ralston
patent: 3715307 (1973-02-01), Johnson et al.
patent: 3965003 (1976-06-01), Stanford et al.
patent: 4008164 (1977-02-01), Watson et al.
patent: 4306991 (1981-12-01), Hwa et al.
patent: 4563284 (1986-01-01), Amjad


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