Stabilized polychloroethylenes

Details Stabilized polychloroethylenes Stabilized polychloroethylenes

2006-10-10

2006-10-10

Sanders, Kriellion (Department: 1714)

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

C252S403000, C570S109000, C570S264000, C523S310000

Reexamination Certificate

active

07118689

ABSTRACT:
Polychloroethylene, e.g., trichioroethylene and perchloroethylene, is stabilized with a stabilizing amount of a stable free radical stabilizer, e.g., a material having the 2,2,6,6-tetra(lower alkyl)-1-piperidinyloxy-yl free radical group, such as 2,2,6,6-tetramethyl-4-hydroxy-1-piperidinyloxy, or the 2,2,5,5-tetra(lower alkyl)pyrrolidinyloxy group, such as 2,2,5,5-tetramethyl pyrrolidinyloxy. Stable free radical stabilizer is removed from a polychloroethylene composition containing same by contacting the composition with silica, e.g., precipitated silica.

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