SULPHUR CROSSLINKABLE RUBBER MIXTURE

Sulfur crosslinkable rubber composition comprises: 1-90 parts per hundred rubbers (phr) of at least one styrene-butadiene rubber and/or at least one butadiene rubber; 5-95 phr of at least one natural and/or synthetic polyisoprene having a molecular weight of greater than 200000 g/mole; 2-50 phr of at least one synthetic polyisoprene having a molecular weight of 500-70000 g/mole; and 2-20 phr of at least one hydrocarbon resin. The hydrocarbon resin is a homopolymer and/or a copolymer e.g. coumarone-indene resins, terpene-phenol resins and/or phenol-formaldehyde resins. Sulfur crosslinkable rubber composition comprises: 1-90 parts per hundred rubbers (phr) of at least one styrene-butadiene rubber and/or at least one butadiene rubber; 5-95 phr of at least one natural and/or synthetic polyisoprene having a molecular weight of greater than 200000 g/mole; 2-50 phr of at least one synthetic polyisoprene having a molecular weight of 500-70000 g/mole; and 2-20 phr of at least one hydrocarbon resin. The hydrocarbon resin is a homopolymer and/or a copolymer consisting of coumarone-indene resins, terpene-phenol resins, phenol-formaldehyde resins, aliphatic 5C hydrocarbon resins, aliphatic or aromatic 7C hydrocarbon resins, aliphatic or aromatic 9C hydrocarbon resins, terpene resins and/or rosin.