Tyre for vehicle wheels

A process for manufacturing a tyre for vehicle wheels, comprising:

• forming components of a green tyre onto at least a building drum;
• and
• shaping, moulding and vulcanizing the tyre,
• wherein forming at least one of the components of the green tyre comprises:
• making at least a reinforced structural element, said reinforced structural element comprising i) at least an elastomeric material comprising at least a diene elastomeric polymer and at least a reinforcing filler and ii) at least an elongated reinforcing element, Wherein said elongated reinforcing element comprises at least a fibrous material impregnated with at least a cross-linkable adhesive composition comprising:
• at least a) a rubber latex, at least b) an epoxide, and at least c) a polyamine with molecular weight higher than 190 Daltons, comprising at least two amino groups selected from primary —NH2 and secondary —NH— amino groups, wherein the polyamine c) is chosen from:
• c1) linear or branched amino terminated polyethers, c2) aminoalkylated polysaccharides, c3) aminoalkylated polyvinyl alcohols, and c4) mixtures thereof, and
• wherein the fibrous material is chosen from rayon;
• lyocell;
• polyesters of PET, PEN, or PVA;
• aliphatic polyamides;
• aromatic polyamides;
• and mixtures thereof.

A reinforced structural element of a tyre comprising at least an elongated reinforcing element and at least a cross-linked elastomeric material adhered to said elongated reinforcing element, wherein said elongated reinforcing element comprises at least an elongated fibrous material comprising cross-linking products of at least a cross-linkable adhesive composition comprising at least a) a rubber latex, at least b) an epoxide, and at least c) a polyamine with molecular weight higher than 190 Daltons, comprising at least two amino groups selected from primary —NH2 and secondary —NH— amino groups, wherein the polyamine c) is chosen from:

• c1) linear or branched amino terminated polyethers, c2) aminoaikylated polysaccharides, c3) aminoalkvlated polyvinyl alcohols, and c4) mixtures thereof, and
• wherein the elongated fibrous material is chosen from rayon;
• lyocell;
• polyesters of PET, PEN, or PVA;
• aliphatic polyamides;
• aromatic polyamides;
• and mixture thereof.

A cross-linkable elongated reinforcing element for a tyre comprising at least a fibrous material impregnated with at least a cross-linkable adhesive composition, said composition comprising at least a) a rubber latex, at least b) an epoxide, and at least c) a polyamine with molecular weight higher than 190 Daltons, comprising at least two amino groups selected from primary —NH2and secondary —NH— amino groups, wherein the polyamine c) is chosen from:

• c1) linear or branched amino terminated polyethers, c2) aminoalkylated polysaccharides, c3) aminoalkylated polyvinyl alcohols, and c4) mixtures thereof, and
• wherein the fibrous material is chosen from rayon;
• lyocell;
• polyesters of PET, PEN, or PVA;
• aliphatic polyamides, aromatic polyamides;
• and mixtures thereof.

A process for manufacturing a cross-linkable elongated element for tyres which comprises:

• providing an elongated fibrous material for reinforced structural elements for tyres;
• impregnating the elongated fibrous material with at least a cross-linkable adhesive composition comprising at least a) a rubber latex, at least b) an epoxide, and at least c) a polyamine with molecular eight higher than 190 Daltons, comprising at least two amino groups selected from primary —NH2 and secondary —NH— amino groups, wherein the polyamine c) is chosen from:
• c1) linear or branched amino terminated polyethers, c2) aminoalkylated polysaccharides, c3) aminoalkylated polyvinyl alcohols, and c4) mixtures thereof, and
• wherein the elongated fibrous material is chosen form rayon;
• lyocell;
• polyesters of PET, PEN or PVA;
• aliphatic polyamides;
• aromatic polyamides;
• and mixtures thereof;
• and
• drying the impregnated elongated fibrous material.