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To improve the flame retardancy and solid content of waterborne polyurethane (WPU), AOT, and AOD series of WPU were synthesized and characterized. Carboxylic acid/nonionic composite units were used as hydrophilic groups, and OP550/THPO and OP550/DOPO‐HQ combinations were used as flame retardant modifiers, respectively. The results revealed that the flame retardant‐modified WPU emulsions still had...