BLOCK DIENE ELASTOMER FOR RUBBER COMPOSITIONS THAT CAN BE USED IN PNEUMATIC TIRES

摘要

The invention relates to a block diene elastomer having the following formula: (I) where: n and m are each integers greater than or equal to 0, such that n+m=1 and n+m =20; each block A consists of a polybutadiene; each block B consists of a diene elastomer, the molar level of units derived from conjugate dienes of which is greater than 15%, the blocks B being identical to one another; X is an organic or inorganic group, which can contain a function interacting with a reinforcing filler; the number-average molecular weight Mn1 of each Block A varies from 2500 to 20,000 g/mol; the number-average molecular weight Mn2 of each block B varies from 80,000 to 350,000 g/mol; and the chaining rate 1,2 in each block A is comprised between 1 and 20%.