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Preparation of Sulfur-Quinone Polyurethanes and Their Use to Inhibit the Corrosion of Iron Particles - A sulfur-quinone diol monomer, 2,5-bis-(2-hydroxyethylthio)-1,4-benzoquinone (SQM-2), was prepared by the reaction of 2-mercaptoethanol with benzoquinone. SQM-2 and polycaprolactone diol (number-average molecular weight = 1250) were condensed with toluene diisocyanate to give sulfur-quinone polyurethanes. Two compositions were prepared, SQPU-1 containing 7 mol % SQM-2 and SQPU-2 containing 35 mol % SQM-2. These thermoplastic polyurethanes were soluble in solvents used in magnetic tape coating processes. The polymers were used to prepare magnetic coatings containing state-of-the-art commercial iron particles. The sulfur-quinone polyurethanes protected the iron particles against corrosion from a pH 2.0 aqueous buffer/ / Hu, Y / John Wiley ＆ Sons / Journal of polymer science Part A Polyme / p.3278-3283 / 2000

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