Vehicle tyres with high heat and wear resistance - having tread made of mixt. in which 30-100 per cent of rubber component is nitrile rubber with below 13 double bonds for 100 carbon atoms.

摘要

Vehicle tyres (I) of rubber or rubber-like plastics have a tread strip (A), a carcass which is anchored in the beads by means of belts of high-tensile bead core, and a reinforcing belt; the tread strip (A), or at least its running surface, is made of a rubber mixt. (II) which consists of 30-100 wt.% (w.r.t. rubber component) of a nitrile gp.-contg. hydrocarbon rubber with double bond content below 13/100 C atoms (III). The whole of (A) is made of (II) and its thickness is 75% of the thickness of a normal tread strip; (II) contains a partly-satd. rubber with CN gps. (pref. HNBR or HNIR) and a sulphur crosslinking system, and its rubber component pref. consists of 80 wt.% HNBR or HNIR and 20 wt.% polybutadiene; (II) has abrasive wear below 50 mm3 (DIN 53516) and resilience 25-50%. ADVANTAGE - The use of HNBR or HNIR in (II) gives a tyre tread with increased heat resistance and wear resistance (such that the tread can be 25% thinner than a normal tread), together with very high resistance to ageing and to oil.