C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
400/5024, 400/93
C08F 2/32 (2006.01) C08F 20/60 (2006.01)
Patent
CA 1204535
ABSTRACT OF THE DISCLOSURE An improved process for preparing stable partially quaternized amino methylated acrylamide polymers which are in the form of water-in-oil emulsions, which emulsions are thermally stable and readily invert in alkaline waters which comprises the steps of: preparing a formaldehyde adduct of a secondary amine containing 2 - 8 carbon atoms as a 0.1 to 55% by weight aqueous solution; adding the formaldehyde adduct in an amount sufficient only to aminomethylate between 5 - 80% of the acrylamide groups therein to a water-in-oil emulsion of a finely divided acrylamide polymer reacting the acrylamide polymer with the formaldehyde adduct; reacting said partially amino methylated acrylamide poly- mer contained in the water-in-oil emulsion with more than 6% by weight based on the water in the emulsion of sodium bisulfite to provide a stabilized water- in-oil emulsion; and finally reacting the water-in-oil emulsion of a finely divided stabilized amino methylated acrylamide polymer with a quaternizing agent containing 1 - 7 carbon atoms. These modified polymers exhibit higher thermal stability and better solution characteristics after long term storage than the known acrylamide polymers.
394695
Nalco Chemical Company
Smart & Biggar
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