Itaconic acid → Itaconic acid

HRID 1734956Notes

Reaction equation

[C:1]([OH:9])(=[O:8])[C:2]([CH2:4][C:5]([OH:7])=[O:6])=[CH2:3].[C:10]([NH:14][C:15]([CH3:22])([CH3:21])[CH2:16][S:17]([OH:20])(=[O:19])=[O:18])(=[O:13])[CH:11]=[CH2:12].C1(=O)OC(=O)C=C1>O>[C:1]([OH:9])(=[O:8])[C:2]([CH2:4][C:5]([OH:7])=[O:6])=[CH2:3].[C:10]([NH:14][C:15]([CH3:22])([CH3:21])[CH2:16][S:17]([OH:20])(=[O:18])=[O:19])(=[O:13])[CH:11]=[CH2:12].[C:1]([OH:9])(=[O:8])/[CH:2]=[CH:4]\[C:5]([OH:7])=[O:6]

Participants

Conditions

Temperature: 60 °C

Procedure

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.

Workup

customwas prepared
customplaced in a water bath
customThe nitrogen was bubbled through the solution (reaction mixture) for at least 30 minutes
additionfollowed by the addition to the reaction mixture of 0.4 gram of sodium persulfate and 0.7 milliliter of tetraethylenepentamine
customto produce an aqueous reaction solution

Sources & evidence

ORD record: ord-8eebccbf0e464db29586fb190151bffd
Source dataset: uspto-grants-1996_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05536311

Reaction notes

Loading…