Patent Number: 6,255,259

Title: Phosphorus-free multifunctional additives for lubricants

Abstract: Suitable lubricant additives are the compounds of formulae ##STR1## wherein the substituents and groups have the following preferred meanings: R.sub.1 =H; R.sub.2 =methyl or tert-butyl; R.sub.3 =tert-butyl; s=0, 1 or 2; R.sub.4 =--A--[(C.sub.6 H.sub.2)(methyl or tert-butyl)(OH)(tert-butyl)]; A=--CH.sub.2 CH.sub.2 O--(C.dbd.O)--CH.sub.2 CH.sub.2 -- or --CH.sub.2 CH(CH.sub.3)--O--(C.dbd.O)--CH.sub.2 CH.sub.2 --.

Inventors: Camenzind; Hugo (Bern, CH), Dratva; Alfred (Bottmingen, CH), Hanggi; Peter (Giffers, CH)

Assignee: Ciba Specialty Chemicals Corporation

International Classification: C07D 277/00 (20060101); C07D 285/125 (20060101); C07D 285/00 (20060101); C07D 277/74 (20060101); C10M 135/36 (20060101); C10M 135/00 (20060101); C07D 285/12 ()

Expiration Date: 07/03/2018