Process for chain stopping of pvc polymerization

Details Process for chain stopping of pvc polymerization Process for chain stopping of pvc polymerization

C - Chemistry, Metallurgy

08

F

C08F 14/06 (2006.01) C08F 2/42 (2006.01)

Patent

CA 2484148

The present invention relates to a process and 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 the vinyl chloride polymerization or copolymerization. A further aspect of the invention is the use of higher sterically hindered nitroxyl radicals alone as chain stopping agents for the vinyl chloride polymerization.

La présente invention concerne un procédé et une composition d'arrêt de chaîne de polymérisation ou de copolymérisation de chlorure de vinyle en présence d'un radical libre nitroxyle stable et d'un antioxydant phénolique. Cette invention porte également sur un radical libre nitroxyle stable et un antioxydant phénolique utilisés conjointement comme mélange d'arrêt de chaîne pour la polymérisation ou la copolymérisation de chlorure de vinyle, ainsi que sur des radicaux nitroxyle à encombrement stérique supérieur utilisés seuls comme agents d'arrêt de chaîne pour la polymérisation de chlorure de vinyle.

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