Thermoplastic poly(urethane-urea) polyadducts

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)
• wherein I, M, C1 and C2 each represent bivalent residues that are linked to each other via a urethane or urea moiety, whereof
• each I independently represents a bivalent, saturated or unsaturated, aliphatic, alicyclic or aromatic residue with 1 to 20 carbon atoms derived from a diisocyanate;
• each M independently represents a bivalent residue of an aliphatic polyether, polyester or polycarbonate derived from a macrodiol having a number average molecular weight Mn≥500;
• each C1 independently represents a bivalent, saturated or unsaturated, aliphatic or alicyclic residue with 1 to 30 carbon atoms derived from a diamine or amino alcohol with at least one sterically hindered secondary amino group through removal of one N-linked hydrogen atom each of the diamine or one N-linked and the O-linked hydrogen atoms of the amino alcohol;
• each C2 independently represents a bivalent, saturated or unsaturated, aliphatic, alicyclic or aromatic residue with 1 to 20 carbon atoms derived from a diol, diamine or amino alcohol;
• wherein, 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;
• wherein optionally at least one of the residues I, M, C1 and C2 comprises one or more ester moieties;
• and
• 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;
• provided that within each separate block a+c≥1 and in all blocks together at least one a≥1 and at least one c≥1.