Patent ID: 9080711
Filing Date: 2015-07-14
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 and said lubricating composition comprising: i) a solid lubricant; ii) a matrix, comprising in % by weight of the matrix: 5 to 96% polyethylene homopolymer; 2 to 30% carnauba wax; 2 to 30% zinc stearate; 0 to 50% of a calcium sulphonate derivative; 0 to 15% alkyl polymethacrylate; 0 to 1% coloring agent; and 0 to 1% anti-oxidant; and iii) a braking additive which is dispersed in the matrix and selected in order 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, wherein the 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 the tubular threaded joint, wherein the braking additive is selected from the group consisting of bismuth oxide, titanium oxide, colloidal silica, acrylic polymers and carbon black, wherein the matrix is of a solid consistency, not sticky to the touch, and particles of the solid lubricant are dispersed in the matrix with the braking additive.