Triblock polymer comprising a statistical copolymer core block of a branched diene and ethylene and two terminal blocks, respectively polystyrene and polyvinylpyridine

Abstract

The invention relates to a triblock polymer of formula A-B-C in which the symbol A represents a polystyrene block, the symbol B represents a statistical copolymer block of ethylene and a branched 1,3-diene of formula CH2=CR'-CH=CH2, the symbol R' represents a hydrocarbon chain having 3 to 20 carbon atoms, and the symbol C represents a polyvinylpyridine block, the styrene units of block A being present in the triblock polymer in a molar content of less than 15% of the repeating units constituting the triblock polymer, the vinylpyridine units of block C being present in the triblock polymer in a molar content of less than 5% of the repeating units constituting the triblock polymer, and the triblock polymer having a Mooney viscosity ML (1+4) at 100°C greater than 30. The invention also relates to a method for synthesizing a polymer of this kind, and to a rubber composition containing same and intended to be used in particular in a tire.

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