Polymer composition comprising a thermoplastic elastomer and a hydrocarbon plasticizer resin

A polymer composition comprising:

• at least one block thermoplastic elastomer of formula A-B-A, in which A is a thermoplastic block comprising α-methylstyrene units and B is a diene elastomer block predominantly comprising diene units;
• and
• at least one optionally hydrogenated hydrocarbon-based plasticizing resin having an aromatic proton content of less than or equal to 40% and a number-average molar mass Mn of greater than or equal to 600 g/mol and less than or equal to 3000 g/mol,
• wherein a content of the at least one optionally hydrogenated hydrocarbon-based plasticizing resin is in a range from 5 to 70 phr, and
• wherein, when the at least one optionally hydrogenated hydrocarbon-based plasticizing resin has an aromatic proton content of greater than 15%, the at least one optionally hydrogenated hydrocarbon-based plasticizing resin content in the polymer composition is at most 35 phr, when the at least one optionally hydrogenated hydrocarbon-based plasticizing resin has an aromatic proton content of greater than 20%, then the at least one optionally hydrogenated hydrocarbon-based plasticizing resin content in the polymer composition is less than 25 phr, and when the at least one optionally hydrogenated hydrocarbon-based plasticizing resin has an aromatic proton content of greater than 30%, then the at least one optionally hydrogenated hydrocarbon-based plasticizing resin content in the polymer composition is less than 15 phr.