Polyurethane with (5-alkyl -1,3-dioxolen-2-one-4-yl) end groups and uses thereof

A polyurethane (PP2) comprising:

• at least two T end functions of formula (I) below:
• wherein R1 and R2, which are identical or different, each represent a hydrogen atom, a linear or branched alkyl group, a cycloalkyl group, a phenyl group, or an alkylphenyl group with a linear or branched alkyl chain;
• or R1 and R2 may be bonded together to form a —(CH2)n— group with n=3, 4 or 5, and
• at least one divalent unit of formula (II) below:
• wherein:
• p is an integer ranging from 1 to 2;
• q is an integer ranging from 0 to 9;
• r is an integer equal to 5 or 6;
• R represents a saturated or unsaturated, cyclic or acyclic, linear or branched hydrocarbon chain comprising from 1 to 20 carbon atoms;
• and
• R′ represents a linear or branched, saturated, divalent hydrocarbon group having from 2 to 4 carbon atoms.