Molding sinterable thermoplastic aliphatic polyurethane with improved efflorescence behavior.

摘要

Polyurethanes photostable sinterable, thermoplastic obtainable from a) an isocyanate component consisting of a1) 100 to 70 mole% 1,6-hexamethylene diisocyanate and of a2) from 0 to 30 mol% of an aliphatic diisocyanate or mixtures aliphatic diisocyanates and / or cycloaliphatic, except 1,6-hexamethylene diisocyanate, b) a chain extender component consisting of b1) 100 to 40 mol% of at least one chain extender having a number average molecular weight between 104 and 500 g / mol the group consisting of compounds of formulas (I) and (II) ** ** see formulas with R 1 moieties alkylene branched or unbranched 1 to 12 carbon atoms or alkarylene moieties substituted or unsubstituted 6 to 24 carbon atoms C, R 2, R 4 alkylene radicals or alkoxyalkylene branched or unbranched 1 to 12 carbon atoms or alkarylene substituted moieties or unsubstituted 6 to 24 carbon atoms, R 3 moieties alkylene branched or unbranched 1 to 8 carbon atoms, n, m 0 to 10 , Where n + m = 1, and p 1 to 10, b2) 0 to 60 mole% of a chain extender or mixture of chain extenders with average 60 molecular weight 400 g / mol wherein the chain extender b2) is not identical to the chain extender b1), and c) at least one polyol component with a number average molecular weight of 600 to 6000 g / mol, in the presence of d) optionally catalysts with the addition of e) 0.1 to 5% by weight, based on thermoplastic polyurethane, of light stabilizers, f) optionally other additives and / or adjuvants and g) optionally chain terminators, in which the ratio isocyanate groups of a) to isocyanate-reactive groups of b), c) and g) is from 0.9: 1 to 1.1: 1.