PROCESSES FOR PRODUCTION OF MACROMOLECULAR AMINE-PHENOLIC ANTIOXIDANT COMPOSITIONS CONTAINING LOW AMOUNTS OF NON-MACROMOLECULAR BYPRODUCTS

摘要

Processes are provided for producing macromolecular oxidation inhibitors that are almost free of low molecular weight components. Such processes comprise heating a combination comprising an aromatic amine, an acid catalyst, an alkylating agent, and a solvent to about 35°C to about 25O°C, thereby forming a reaction solution comprising one or more macromolecular amine-phenolic antioxidant solids and one or more non-macromolecular byproducts; combining at least the reaction solution and an antisolvent such that a precipitant comprising a substantial portion of the macromolecular amine-phenolic antioxidant solids precipitates out of the reaction solution, while a substantial portion of the non-macromolecular byproducts remain in the reaction solution; separating the precipitant from the reaction solution; and drying the precipitant to produce a MAPAC comprising less than about 1 wt.% non-macromolecular byproducts.