Low molecular weight hydrolyzed polyacrylamide and use thereof a

Details Low molecular weight hydrolyzed polyacrylamide and use thereof a Low molecular weight hydrolyzed polyacrylamide and use thereof a

1975-06-13

1977-01-04

Welsh, M. J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 296Z, 260 296AT, C08L 3302

Patent

active

040011615

ABSTRACT:
A low molecular weight hydrolyzed polyacrylamide having exceptional effectiveness as a scale-inhibiting agent is prepared by a process involving simultaneously and continuously charging separate streams of acrylamide monomer, ammonium persulfate (as catalyst) and mercaptoalkanoic acid (as chain transfer agent) to a reaction zone containing water under reflux, the rate of charging being such that the heat of polymerization is sufficient to maintain reflux in the reaction zone without exceeding the capacity of the condenser to remove the heat of reaction, and then reacting the polymer product with sufficient aqueous caustic to hydrolyze from about 60 to 90% of the amide groups in the polymer product.

REFERENCES:
patent: 2820777 (1958-01-01), Suen et al.
patent: 3247171 (1966-04-01), Walker et al.
patent: 3380947 (1968-04-01), Galgoczi et al.
patent: 3846390 (1974-11-01), Ito et al.
Bovey et al, Emulslon Polymerization, Interscience, N.Y., 1955, pp. 278 and 279.

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