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US 4,283,507 AGranted
Hydrolysis of acrylamide polymers
AssigneeNalco Chemical Company
InventorsKenneth G. Phillips, Mary E. Bingham
Life of this patent
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Abstract
This invention relates to a method for the hydrolysis of acrylamide polymers utilizing less than stoichiometric amounts of a hydrolysis agent selected from the group consisting of alkali metal hydroxides and alkali metal sulfites. The process is conducted with a water-in-oil emulsion (latex) of the acrylamide polymer at an elevated temperature and pressure.
Claims3
A method of enhancing hydrolysis of an acrylamide polymer contained in a latex, employing either sodium hydroxide or sodium sulfite as a hydrolyzing agent for imparting anionic character to the polymer, comprising:
- (a) incorporating a mixture of the latex and hydrolyzing agent in a reaction vessel having a vapor space above the mixture;
- and
- (b) reacting the mixture at about 125.degree. C. while maintaining a pressure in the vapor space sufficient to suppress boiling, for a time sufficient to convert amide groups to anionic character.
Dependencies are inferred from the claim text.