Patent EP-2586807-A1 (EP)
Inventor: WAMPRECHT CHRISTIAN
IPC: C08G18/66
Filed: 2012-10-23
Abstract: A composition comprises thermoplastic polyurethane obtained from components containing 1,6-hexamethylene diisocyanate, low-molecular polyol component having 30-100 mol% of difunctional chain extender with number-average molecular weight (M n) of 76-286 g/mol and chain extender with M nof 104-500 g/mol, polyol component having polycarbonate diol with M nof 500-3000 g/mol, optionally catalysts, optionally additives and/or auxiliary substances, optionally monofunctional chain terminators, and a mixture of amorphous and/or crystalline silicon dioxide and polyorganosiloxane mixture. A composition comprises a thermoplastic polyurethane obtained from components containing: a) an isocyanate component consisting of 1,6-hexamethylene diisocyanate, b) a low-molecular polyol component consisting of 30-100 mol% of at least one difunctional chain extender having a number-average molecular weight M nof 76-286 g/mol and 0-70 mol% of at least one chain extender having a number-average molecular weight M nof 104 to 500 g/mol and having formulae H-(O-R 1-C(O)) n-O-R 2-O-(C(O)-R 1-O) m-H (I) or H-O-R 4-O-(C(O)-R 3-C(O)-O-R 4-O) p-H (II), c) a polyol component consisting of at least one polycarbonate diol having a number-average molecular weight M nof 500 to 3000 g/mol, where the ratio of the number of isocyanate groups in component (a) to the number of groups that are reactive towards isocyanate in components (b), (c) and optionally (g) amounts to 0.9: 1 to 1.1:1, e) optionally catalysts, f) optionally additives and/or auxiliary substances, g) optionally monofunctional chain terminators, d) 0.4 to 10 wt.%, relative to the total weight of the composition, of a mixture consisting of 0.1-4 wt.%, relative to the total weight of the composition, of at least one amorphous and/or crystalline silicon dioxide, and polyorganosiloxane mixture, where each of the polyorganosiloxanes is of formula (R 2SiO) n', where the polyorganosiloxane mixture consists of 0-2 wt.%, relative to the total weight of the composition, of at least one polyorganosiloxane (R 2SiO) n' (where n' is 3 to 300) and 0.2 to 8 wt.%, relative to the total weight of the composition, of at least one polyorganosiloxane (R 2SiO) n' (where n' is 1000 to 8000). R 1optionally branched 1-12C alkylene residue or optionally substituted 6-24C alkarylene residues; R 2and R 4optionally branched 1-12C alkylene residue or 1-12C alkoxyalkyl residue or optionally substituted 6-24C alkarylene residue or optionally substituted 6-24C alkoxyarylene residue; R 3optionally branched 1-8C alkylene residue or optionally substituted 6-20C alkarylene residue, optionally substituted 6-20C arylene residue, or optionally substituted 6-20C aralkylene residue; n and m : 0 to 10;or n+m : >= 1; p : 1 to 10; R : 1-27C organic hydrocarbyl residue which may be either of linear or of branched structure; n' : 3 to 8000. Independent claims are included for the following: (1) a method for the production of the composition, involving adding component (d) to the thermoplastic polyurethane during production or compounding component (d) into the finished thermoplastic polyurethane; and (2) a molding or coating comprising the composition.