Patent ID: 8765035

Claim:
A process for manufacturing a self-extinguishing cable comprising at least one transmissive element and at least one flame-retardant coating in a position radially external to said at least one transmissive element, wherein said at least one coating comprises an expanded flame-retardant polymeric material comprising: (a) at least one expandable polymer; (b) at least one expanding agent; (c) at least one flame-retardant inorganic filler in an amount of 120 parts by weight to 200 parts by weight with respect to 100 parts by weight of the polymer; the process comprising: (i) providing said at least one expandable polymer, said at least one expanding agent, and said at least one flame-retardant inorganic filler to form said flame-retardant material; (ii) feeding the flame-retardant polymeric material to an extruding apparatus, therein melting and mixing it; (iii) passing the flame-retardant polymeric material obtained in step (ii) through at least one static mixer; and (iv) depositing by extrusion the flame-retardant polymeric material obtained in step (iii) onto said at least one transmissive element conveyed to said extruding apparatus, and thereby expanding the flame-retardant polymeric material, wherein the expanded flame retardant polymeric material has an expansion degree of 30% to 50%.