Method of making polymers containing hydroxamate functional groups
AssigneeCytec Technology Corp.
InventorsAlan S. Rothenberg, Morris E. Lewellyn, C. Joseph Calbick
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Abstract
A process is disclosed for the formation of highly anionic hydroxamic acid polymers whereby (meth) acrylic acid polymers are esterified in aqueous solution to poly (meth) acrylates. The resultant polymers are then reacted with an hydroxylamine to produce hydroxamated (meth) acrylic acid containing polymers. The esterified polymers, their hydroxamated derivatives and their use to flocculate Bayer Process streams are also disclosed.
Claims12
A method which comprises esterifying a water-soluble polymer of an acrylic acid or salt thereof having a weight average molecular weight of over about 1 million in aqueous solution and hydroxamating the resultant esterified polymer, wherein said water-soluble polymer is in the dispersed phase of a water-in-oil emulsion.
A method which comprises esterifying a water-soluble polymer of an acrylic acid salt having a weight average molecular weight of over about 1 million in aqueous solution and hydroxamating the resultant esterified polymer, wherein said water-soluble polymer is in the dispersed phase of a water-in-oil emulsion and wherein said acrylic acid salt is an ammonium or sodium salt.
Dependencies are inferred from the claim text.