Polymeric composition comprising a thermoplastic elastomer with butadiene and styrene blocks and a compatible plasticizer

A polymer composition comprising:

• (a) at least one block thermoplastic elastomer, wherein the at least one block thermoplastic elastomer is a triblock copolymer comprising a central elastomer block and a terminal thermoplastic block at each of two ends of the elastomer block, the central elastomer block predominantly comprising units derived from butadiene and further comprising units derived from one or more styrene monomers, and each of the terminal thermoplastic blocks consisting of units derived from one or more styrene monomers;
• and
• (b) at least one plasticizer selected from butadiene oligomers, wherein:
• (b1) a molar content of 1,2-polybutadiene units in the at least one plasticizer is within a range of from 70% to 130% of a molar content of 1,2-polybutadiene units in the at least one elastomer block of the at least one block thermoplastic elastomer, and a molar mass of the at least one plasticizer is greater than 1500 g/mol and less than 50,000 g/mol, or
• (b2) a molar content of 1,2-polybutadiene units in the at least one plasticizer is less than 70%, or greater than 130%, of a molar content of 1,2-polybutadiene units in the at least one elastomer block of the at least one block thermoplastic elastomer, and a molar mass of the at least one plasticizer is greater than 4000 g/mol and less than 50,000 g/mol.