Conducting polymer-thickened grease compositions

Electrically conducting lubricant grease composition comprising

• a lubricating base oil,
• a polymeric thickener, and
• an electrically conducting component,
• wherein the polymeric thickener comprises a mixture of a copolymer or homopolymer of propylene with a weight average molecular weight of 200,000 or more and a copolymer or homopolymer of propylene with a weight average molecular weight of 100,000 or less.

Method for preparing a conducting lubricant grease composition, comprising

• mixing or dissolving a polymeric thickener with or in a lubricating base oil at a mixing temperature above melting point of said polymeric thickener to obtain a first composition,
• incorporating into said first composition an electrically conducting component,
• cooling the grease composition thus obtained from the mixing temperature to room temperature in 1 sec.-3 min., and
• working the grease to the required consistency, wherein the polymeric thickener comprises a mixture of a copolymer or homopolymer of propylene with a weight average molecular weight of 200,000 or more and a copolymer or homopolymer of propylene with a weight average molecular weight of 100,000 or less.