Process for producing tyres

A process for producing tyres, comprising:

• building a green tyre comprising two bead structures, each bead structure comprising a bead filler and annular anchoring structures;
• and
• subjecting the green tyre to moulding and cross-linking to obtain a finished tyre,
• wherein at least one rigid component of said green tyre selected from among said bead filler, a coating of said annular anchoring structures, an anti-abrasive strip and a sidewall insert comprises a final elastomeric compound comprising at least one elastomeric polymer, at least one reinforcement filler, components capable of facilitating the cross-linking, and at least 5 phr of reinforcement resin, and
• wherein said final elastomeric compound is produced by:
• feeding at least the elastomeric polymer and the reinforcement filler to a first batch mixing device,
• mixing and dispersing, in said first batch mixing device, at least said reinforcement filler into said elastomeric polymer in a manner so as to obtain a first-phase elastomeric compound,
• unloading said first-phase elastomeric compound from said first batch mixing device,
• feeding said first-phase elastomeric compound to a continuous mixing device, said continuous mixing device being selected from an intermeshing and co-rotating twin-screw or multi-screw device and a planetary device,
• feeding to said continuous mixing device, separate from said first phase elastomeric compound, at least 5 phr of reinforcement resin,
• mixing and dispersing in said continuous mixing device said reinforcement resin into said first-phase elastomeric compound to obtain an intermediate elastomeric compound, said mixing in said continuous mixing device being executed at a speed from about 40 revolutions per minute to about 400 revolutions per minute,
• unloading said intermediate elastomeric compound from said continuous mixing device,
• feeding said intermediate elastomeric compound to a second batch mixing device,
• feeding to said second batch mixing device, separate from said intermediate elastomeric compound, components capable of facilitating the cross-linking,
• mixing, in said second batch mixing device, said components capable of facilitating the cross-linking into said intermediate elastomeric compound to obtain said final elastomeric compound, wherein each of said first and second batch mixing device has two counter-rotating rotors and the mixing in said batch mixing devices is executed at a speed from about 5 revolutions per minute to about 80 revolutions per minute, and
• unloading said final elastomeric compound from said second batch mixing device.