| abstract |
The invention provides the use of a compound selected from:n (a) fluorinated bis-benzimidazoles of the formula:n nwherein R is -F or -CH 3 ; p and q are integers such as the sum p+q is from 0.1 to 2; (b) esters of phosphorous acid with a perfluoroalkoxyalcohol; (c) perfluoropolyethers with phosphinic groups at one or both ends; (d) perfluoropolyethers with perfluoropolyoxyperfluoro- alkyl-substituted phosphotriazinic groups; n as anti-wear additives for a lubricating grease based on polytetrafluoroethylene (PTFE) in the form of fine particles and on a liquid dispersant selected from an oligomer of trifluoro-chloroethylene or from a perfluoropolyether. |