Abstract: A thermoplastic poly(urethane-urea) polyadduct with sterically hindered urea groups of the following Formula (I): —[I-M-(I—C1)a—(I-M)b-(I—C2)c]n-??(I) I, M, C1 and C2 each representing bivalent residues linked to each other via a urethane or urea moiety. In the residues I, C1 and C2, when more than four carbon atoms are present, optionally at least one of them is substituted by a heteroatom selected from oxygen and nitrogen. Optionally at least one of the residues I, M, C1 and C2 includes one or more ester moieties. a, b and c each independently represent an integer from 0 to 10, and n is a number ?3 representing the number of blocks in the polyadduct. Within each separate block a+c?1, and in all blocks together at least one a?1 and at least one c?1.