| abstract |
A diene rubber (I) for use in the production of tyres is characterised in that the polymerisation of monomeric diene compounds is carried out in the presence of an organometallic compound (II) of formula (1) and optionally a cocatalyst (III). (II) is optionally a heterogeneous catalyst on an inorganic support. RnMXm (1) M = metal; R = hydrocarbon group; X = F, Cl, Br or I, H 1-10C alkyl, 6-15C aryl or OR<1>, OC(OR)R<1>; R<1> = 1-10C alkyl, 6-15C aryl, alkylaryl, F, fluoroalkyl or fluoroaryl with 1-10C in alkyl and 6-20C in aryl; n, m = 0 - 4; n + m 5. |