C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
134/39, 260/480
C02F 5/10 (2006.01) C08F 20/28 (2006.01) C08F 220/06 (2006.01) C08F 220/20 (2006.01)
Patent
CA 1222770
METHOD OF MAKING AND USING NOVEL SCALE INHIBITING TERPOLYMER ABSTRACT OF THE DISCLOSURE A two-step process is disclosed for preparing an essentially non- crosslinked random copolymer of acrylic acid or methacrylic acid with esters of the acids which esters are formed by reaction with an alkylene oxide. Raw materials, are (meth)acrylic acid and alkylene oxide. In a first step, a predetermined amount of a particular esterification catalyst is used, and with close control of process conditions, the (meth)acrylic acid yields both mono- and polyalkoxylated esters. In the second step polymerization is effected without separating the esterification catalyst or purifying the esters formed. The resulting random copolymer formed consists essentially of a terpolymer of (i) acrylic acid or methacrylic acid (together "(meth)acrylic"), (ii) a hydroxymonoalk- ylated (meth)acrylate, and (iii) a hydroxypolyalkyleneoxylated (meth)acrylate the monomeric moieties being present in specified relative proportions. Despite the presence of the polyalkyleneoxylated ester moiety the terpolymer is soluble in water, and is surprisingly effective in the treatment of industrial process water used in recirculating water systems.
448649
Goodrich (b.,f.) Company (the)
Marcoux & Sher Swabey Mitchell Houle
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