Resin-extended modified diene rubber

A resin-extended modified diene elastomer based on:

• a plasticizing resin;
• and
• a diene elastomer having a number-average molar mass before modification Mn1 and a number-average molar mass Mn2 after modification, Mn1 and Mn2 being measured by triple detection size exclusion chromatography,
• wherein the resin-extended modified diene elastomer comprises branched chains and corresponds to the following general formula (I)
• in which:
• E represents a branch of the diene elastomer;
• Z represents an atom selected from the group consisting of P, Si and Sn;
• R1 represents, independently at each occurrence, a hydrogen atom, a C1-C10 alkyl or a C6-C12 aryl;
• R2 represents, independently at each occurrence, a C1-C10 alkyl;
• R3 represents a saturated or unsaturated, cyclic or non-cyclic, divalent C1-C18 aliphatic hydrocarbon radical, or a divalent C6-C18 aromatic hydrocarbon radical;
• Y represents a hydrogen atom or a function capable of interacting with a reinforcing filler;
• m is an integer being equal to 2, 3 or 4;
• n is an integer being equal to 0, 1 or 2;
• p is an integer being equal to 0, 1 or 2;
• q is an integer being equal to 0 or 1;
• with the proviso that
• when Z=P then q=0, m=2 or 3 and m+n+p=3;
• when Z=Sn then q=0 and m+n+p=4;
• and
• when Z=Si then m+n+p+q=4, and
• wherein the resin-extended modified diene elastomer has an Mn2 of greater than or equal to 200,000 g/mol and an Mn2/Mn1 ratio of strictly greater than 1.00.