Ciba Specialty Chemicals Corporation

Alfred Dratva

Hugo Camenzind

Samuel Evans

Peter H&auml;nggi

Heterocyclic thioethers as additives for lubricants

Suitable lubricant additives are the compounds of formulae

Phosphorus-free multifunctional additives for lubricants

This invention relates to compounds which are suitable as ash-free antiwear additives and antioxidants, to lubricant compositions comprising said compounds as well as to their use. Compounds of formulae ##STR1## are particularly preferred. In the preferred compounds I',

Suitable lubricant additives are the compounds of formulae wherein the substituents and groups have the following preferred meanings:

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Bottmingen, Switzerland

Alfred Dratva