METHOD FOR CHAIN STOPPING OF PVC POLYMERIZATION

摘要

PROBLEM TO BE SOLVED: To provide a method for chain stopping of PVC polymerization resulting in increased efficiency of the chain termination step. SOLUTION: The present invention relates to a method and a composition for the chain stopping of vinyl chloride polymerization or copolymerization in the presence of a stable free nitroxyl radical and a phenolic antioxidant. A further subject of the invention is the use of a stable free nitroxyl radical together with a phenolic antioxidant as a chain stopping mixture for polymerization or copolymerization of vinyl chloride. Another aspect is the use of higher sterically hindered nitroxyl radicals as chain stopping agents for the vinyl chloride polymerization. COPYRIGHT: (C)2009,JPO&INPIT