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    • Alkylene oxide esters of lignin sulfonic acid 

      Virginia Tech Intellectual Properties, Inc.; Glasser, Wolfgang G.; Dhara, Kaliprasanna (United States Patent and Trademark Office, 1992-04-07)
      Lignin sulfonates are converted into sulfonic acid esters by blocking free phenolic hydroxyl groups on the lignin sulfonates from reaction with a suitable protective group, subjecting the blocked lignin sulfonate in aqueous ...