| abstract |
The invention relates to lubricant compositions comprising (a) one or more mineral oils or synthetic oils and (b) 0.05 to 5% by weight of at least one compound of formulae I, II and III <IMAGE> I <IMAGE> II <IMAGE> III wherein R1, R2, R3, R4 and R5 are as defined in claim 1; and (c) further optional lubricant additives. Some of these compounds are new and can be prepared by Mannich reaction from the appropriate 2-mercaptobenzothiazoles, an aldehyde R2-CHO and a primary or secondary mono- or diamine. These Mannich bases are useful additives for lubricants for reducing friction, wear, corrosion and oxidation. |