Ciba Specialty Chemicals Corporation

Nalco/exxon Energy Chemicals,l.p.

Roland A E Winter

Jean Rody

Mario Slongo

Jean-Luc Birbaum

Andreas Valet

David G Leppard

Glen T Cunkle

Vien V Toan

Thomas Friend Thompson

Volker H Von Ahn

Michela Bonora

Stabilized organic material

Dimeric light stabilizers for polyolefines and polyolefine copolymers

Industrial plant streams and processes that contain reactive light olefins such as isoprene and butadiene are plagued with fouling problems due to premature polymerization resulting in significant economic loss. A combination of phenylenediamines with nitroxides is found to be synergistic in its ability to prevent this premature polymerization of reactive light olefins.

Antifoulant compositions and processes

1,2-Bis-adducts of stable hindered nitroxide compounds with substituted ethylenes are prepared by reacting two equivalents of nitroxyl compound with an ethylenically unsaturated compound such as styrene or an acrylate ester. These adducts are very effective inhibitors to prevent the premature polymerization of ethylenically unsaturated monomers when such monomers are distilled, processed or stored.

1,2-bis-adducts of stable nitroxides with substituted ethylenes and stabilized compositions

o-Hydroxyphenyl-s-triazines of the formula I

Growing community of inventors

Armonk, NY, United States of America

Roland A E Winter