Patent ID: 8673828
Filing Date: 2014-03-18
Classification: C10M,C10N,F16B,F16L

Abstract:
1. A film-forming lubricating composition for make up of threaded joints suitable for covering at least one thread and a screwing abutment of a threaded element of a component of a tubular threaded joint with a film in the solid state which is adhesive to said thread and said screwing abutment, said screwing abutment being intended to bear against another abutment of another component of said tubular threaded joint in the terminal make up phase, said lubricating composition comprising: a thermoplastic matrix; and at least one braking additive; wherein the thermoplastic matrix is an aqueous emulsion comprising: the at least one braking additive is arranged to allow a torque on shoulder resistance value to be obtained which is at least equal to a threshold value equal to 100% of a torque on shoulder resistance reference value of a grease of type API RP 5A3 obtained for said tubular threaded joint, and the at least one braking additive is selected from the group consisting of bismuth oxide, titanium oxide, a colloidal silica, an acrylic polymer and carbon black, the at least one braking additive is dispersed in the thermoplastic matrix and the at least one braking additive is selected to impart to the composition, in addition to lubrication, a coefficient of friction selected in such a way as to obtain a torque on shoulder resistance value which is at least equal to a threshold value.