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Soochow University Patent: Aniline Acid Anhydride Preparation Method

The USPTO granted Patent US12606530B2 to Soochow University on April 21, 2026, covering an aniline acid anhydride, its preparation method, and a polyaminoacid graft chain. The preparation involves an addition-elimination reaction between N-phenyl amino acid and Boc anhydride under acidic conditions, followed by cyclization under nitrogen to obtain the aniline anhydride. The polyaminoacid graft chain is intended for covalent bonding with fiber materials to improve water-repellent fabric fastness while maintaining wearability.