Acrylate/maleate copolymers, their preparation and use as...

Details Acrylate/maleate copolymers, their preparation and use as... Acrylate/maleate copolymers, their preparation and use as...

C - Chemistry, Metallurgy

08

F

402/305, 134/39

C08F 22/06 (2006.01) C02F 5/10 (2006.01) C08F 220/04 (2006.01) C08F 220/06 (2006.01) C08F 222/04 (2006.01) C08F 222/06 (2006.01)

Patent

CA 1194645

ACRYLATE/MALEATE COPOLYMERS, THEIR PREPARATION AND USE AS ANTISCALANTS Abstract Substantially homogeneous acrylate/maleate co- polymers of number average molecular weight of 500 to 5000 are prepared by copolymerizing 35 to 65 mole percent acrylic or methacrylic acid with 65 to 35 mole percent maleic anhydride at 80 to 150°C in the presence of a polymerization initiator and a chain-transfer solvent such that both the monomers and the formed polymer remain in solution and the mole ratio of the acrylic or methacrylic acid monomer to the maleic anhydride monomer in the solvent is maintained below about 0.2 throughout the polymerization. The copoly- mers in hydrolyzed form are employed at a level of from about 0.1 to 100 ppm for prevention of alkaline calcium and magnesium scale formation, such as during sea- water evaporative desalination.

395642

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