Itaconic acid → Itaconic acid

Participants

Reaction Conditions

Reaction Steps

A terpolymer set retarding additive of the present invention was prepared as follows. 3.4 grams of itaconic acid, 16.6 grams of 2-acrylamido-2-methylpropane sulfonic acid and 1 gram of maleic anhydride were dissolved in 60 grams of deionized water. The solution was deaerated with nitrogen and placed in a water bath maintained at 60° C. The nitrogen was bubbled through the solution (reaction mixture) for at least 30 minutes followed by the addition to the reaction mixture of 0.4 gram of sodium persulfate and 0.7 milliliter of tetraethylenepentamine. The reaction was allowed to proceed for 4 hours to produce an aqueous reaction solution believed to contain about 25.9% by weight terpolymer product. The terpolymer product was comprised of monomer units formed from itaconic acid, 2-acrylamido-2-methylpropane sulfonic acid and maleic acid in a mole ratio, respectively, of 24.5 to 67.0 to 8.5.

Provenance & Evidence