IMPROVEMENTS IN THE PREPARATION OF POLYMERS WITH HYDROXAMIC FUNCTIONS, NEW POLYMERS OBTAINED AND THEIR APPLICATIONS

摘要

Improvements in the preparation of polymers of hydroxamic functions that consist in heating a polyacrylamide aqueous solution with a hydroxylamine salt at temperatures of from about 50 DEG to 85 DEG C. The polymers obtained are used as adjuvants of soil drilling muds, especially in petroleum drilling. The invention concerns itself with improvements in the preparation of polymers of hydroxamic functions, the resulting novel polymers, and applications thereof. The invention provides for the obtention of such polymers having a desired number of hydroxamic groups without noticeable formation of objectionable secondary products; it makes possible, in addition, the preparation of derivatives wherein the chain of the polymer and/or the hydroxamic groups contain different substituents.