Basf Se Corporation

Ciba Specialty Chemicals Corporation

James Robbins

Walter Fischer

Paul Dubs

Hugo Camenzind

Kai-Uwe Schöning

David Eliezer Chasan

Roger Martin

Abdel-Ilah Basbas

Davide Alvisi

Tiziano Nocentini

Robert Cordova

Michael Peter Difazio

Joseph A Kotrola

Gunnar Demme

The present invention relates to a novel process for the preparation of specific sterically hindered nitroxyl ethers from their corresponding sterically hindered nitroxyl radicals by reacting it with an aldehyde and a hydroperoxide. This nitroxyl ether formation may be carried out from different starting nitroxyl radicals, which are subsequently further reacted to the desired compounds. The compounds prepared by this process are effective as stabilizers for polymers against harmful effects of light, oxygen and/or heat and as flame-retardants for polymers.

Process for the preparation of sterically hindered nitroxyl ethers

The invention relates to liquid sulphur-containing antioxidants and to compositions comprising them. The novel lubricant compositions comprise the reaction product of a selected group of 5-tert-butyl-4-hydroxy-3-methyl(or tert-butyl)phenyl substituted carboxylic acid esters with thiodiethylene glycol and a mono-hydroxy alcohol with a carbon chain length higher than 4 C-atoms. The novel lubricant compositions are highly resistant to oxidative degradation and are capable of reducing the negative effects of deposits, such as black sludge, in motor combustion engines, particularly spark ignition internal combustion engines.

Liquid phenolic sulphur-containing antioxidants

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Satsuma, AL, United States of America

James Robbins