Sulfomethylation of high molecular weight polyacrylamide...

Details Sulfomethylation of high molecular weight polyacrylamide... Sulfomethylation of high molecular weight polyacrylamide...

C - Chemistry, Metallurgy

08

F

400/7342, 400/92

C08F 8/34 (2006.01) C08F 20/56 (2006.01)

Patent

CA 1328524

ABSTRACT A process for preparing water-in-oil sulfomethylat- ed polyacrylamide polymers having high reduced specific viscosities is disclosed. The process comprises reacting a polyacrylamide water-in-oil polysoap latex with formaldehyde or an adduct of formaldehyde and bisulfite and a molar excess of an alkali metal sulfite as compared with the moles of formal- dehyde used, in a reaction mixture which has a water-to-polymer ratio of at least about 2.4, at elevated temperatures and pressures. The produced water-in-oil latex terpolymer contain- ing acrylamide, acrylate and sulfomethylacrylamide groups has a reduced specific viscosity greater than the reduced specific viscosity of the starting polyacrylamide polymer latex.

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