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US 3,944,507 AGranted
Method of preparing resins containing sulfonic acid functionality involving oxidation of thiouronium salts with hydrogen peroxide
AssigneeRohm and Haas Company
InventorsDavid H. Clemens, Raymond J. Lange
Life of this patent
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Abstract
Resins containing sulfonic acid functionality may be prepared by reacting a chloromethylated polymer matrix with thiourea and then oxidizing the resulting isothiouronium salt to the sulfonic acid in the presence of hydrogen peroxide, either directly or with the intermediate isolation of the thiol.
Claims6
A method of preparing a polymeric resin having sulfonic acid functionality which comprises a first step of reacting a halomethylated polymer matrix with a thiourea to form an isothiouronium salt and a second step of oxidizing the salt to form resin having sulfonic acid functionality.
Dependencies are inferred from the claim text.