Hydrogenated Radial Polymer and Oil Composition Containing the Same

A hydrogenated coupled radial styrenic copolymer comprising at least three polymeric arms bonded to a nucleus, each arm being the same or different and consisting of a hydrogenated styrenic copolymer having a hydrogenated random copolymer segment (S/E/B) composed of vinyl aromatic(S), ethylene (E), and butylene (B) units, each arm having a peak molecular weight (Mp) of 50 to 150 kg/mol, measured according to ASTM D5296-19;

• wherein the hydrogenated coupled radial styrenic copolymer has:
• a peak molecular weight (Mp) of 400 to 800 kg/mol, measured according to ASTM D5296-19,
• a residual unsaturation (RU) of less than 0.2 meq/g, determined by 1H NMR,
• a butylene content of 30 to 50 wt. %, determined by 1H NMR,
• a vinyl-aromatic content of 30 to 50 wt. %, determined by 1H NMR,
• a vinyl aromatic blockiness index (VABI) of less than 10%, determined by 1H NMR, and
• a coupling efficiency of equal or greater than 80%, measured according to ASTM D5296-19.