Polibutadienu00f3is modified polyester for production of polyurethane and thermoplastic polyurethane elastomers

摘要

The invention relates to a polyurethane obtainable by the reaction of (a) poliisocianatos to selected from 4, 4 '- diisocyanate metanedifenil optionally modified nuclear counterparts larger than 4.4 '- metanedifenil diisocyanate, isocyanate groups containing prepolymers on the basis of 4, 4' metandifenil diisocyanate, and mixtures thereof.With (b) compounds with at least two hydrogen atoms reactive to isocyanate.Comprising B1) block copolymers formed from a polibutadienol and a cyclic ester as a component B1 and B2) extenders or crosslinking agents of low molecular mass having a mass M.Olecular 62 500 g / mol as a component B2, c) optionally additional polymeric compounds (with at least 2 hydrogen atoms reactive to isocyanate, (d) optionally a catalyst D,(E) optionally water, and F) optionally physical blowing agents F, g) optionally further auxiliary and / or material substance added.