| abstract |
The present invention relates to a process for producing a tyre, which includes: -feeding an elastomeric composition to an extruder; -forming by extrusion said elastomeric composition as a continuous elongated element; -depositing said continuous elongated element on a rigid support in a plurality of coils to make up a structural element of a tyre; wherein the step of forming is carried out at a shear rate of at least 1000 s-1 and the elastomeric composition comprises at least one elongational viscosity reducing additive in an amount so that elongational viscosity of said elastomeric composition, measured at 120°C, at the shear rate of the forming step, is at least 10% lower with respect to the elongational viscosity, measured in the same conditions, of the elastomeric composition devoid of said additive. |