Abstract: The invention relates to a process for reacting (i) thermoplastic polyurethanes with (ii) compounds having isocyanate groups, where the (ii) compounds used having isocyanate groups comprise (iia) compounds having at least three isocyanate groups based on aliphatic isocyanates and (iib) compounds having two isocyanate groups based on aromatic isocyanates.

Abstract: The present invention relates to a flame-retardant mixture comprising (A) at least one polyurethane as component A, (B) at least one flame retardant selected from the group consisting of tallow, ammonium phosphate, ammonium polyphosphate, calcium carbonate, antimony oxide, zinc borate, clay, montmorillonite clay, metal oxides, metal hydroxides, organic phosphinate compounds, organic phosphate compounds, polyhydric alcohols, melamine compounds, chlorinated polyethylene, and mixtures thereof, as component B, and (C) at least one crosslinking reagent as component C, where the at least one crosslinking reagent is at least one isocyanate dissolved in at least one polyurethane, and also to a process for the production of a flame-retardant polyurethane, to the resultant flame-retardant polyurethane, and also to the use of a solution of at least one isocyanate in at least one polyurethane in the production of a flame-retardant polyurethane for increasing the mechanical stability of flame-retardant polyurethanes.

Abstract: The invention relates to a thermoplastic polyurethane comprising the following structural unit: R2—CO—NH—R—Si(R1)3-x(OR1)x where: is an aliphatic, araliphatic, or aromatic organic radical having from 1 to 20 hydrocarbon atoms, R1 is an alkyl radical or aryl radical having from 1 to 10 carbon atoms, R2 is —NR3—CO—R4 or —O—R5—O—, R3 is a section of the polymer chain of the thermoplastic polyurethane, in particular a radical which derives from the diisocyanate used to prepare the thermoplastic polyurethane, R4 is a section of the polymer chain of the thermoplastic polyurethane, in particular a radical which derives from the following compounds used to prepare the thermoplastic polyurethane: compounds (b) reactive toward isocyanates, or from the chain extender (c), R5 is an alkylene radical having from 2 to 8 carbon atoms, preferably from 3 to 6 carbon atoms, and x is 1, 2 or 3.

Abstract: Cable sheathing on the basis of thermoplastic polyurethane based on the reaction of (a) isocyanates with (b) diols, wherein the diol (b) is based on straight-chain or branched diols (i) having from 16 to 45 carbon atoms in an uninterrupted carbon skeleton.

Abstract: A process for the preparation of thermoplastic polyurethane by reacting (a) isocyanates with (b) compounds reactive toward isocyanates and having a molecular weight (Mw) of from 500 to 10 000 g/mol and (c) chain extenders having a molecular weight of from 50 to 499 g/mol, if appropriate in the presence of (d) catalysts and/or (e) conventional additives, wherein the chain extender mixture consisting of a main chain extender (c1) and one or more co-chain extenders (c2) is used and the thermoplastic polyurethane prepared has a rigid phase fraction of greater than 0.40, the rigid phase fraction being defined by the following formula: rigid ? ? phase ? ? fraction = { ? x = 1 k ? [ ( m KVx / M KVx ) * M Iso + m KVx ] } / m ges with the following meanings: MKVx: molar mass of the chain extender x in g/mol mKVx: mass of the chain extender x in g MIso: molar mass of the isocyanate used in g/mol mges: total mass of all starting materials in g k: number of chain extenders.

Abstract: Carbodiimide containing at least one silane group bonded by way of urea groups.

Abstract: Thermoplastic polyurethane (i) comprising from 20% by weight to 70% by weight of isocyanate dissolved in the thermoplastic polyurethane, based on the total weight of the thermoplastic polyurethane (i) comprising the isocyanates.

Abstract: In a rigid motor vehicle axle comprising an axle body which is hollow in at least some regions and which has two adapter tube sections joined together from half shells along a longitudinal assembly joint by welding, with axle-supporting and axle-guiding components being fastened in the region of the adapter tubee sections, the respective adapter tube section has at least two recesses and at least one connecting element is partially housed and restrained within the hollow regions of the axle and extends outwardly through the recesses with a form fit. The adapter pipe section and the connecting element are connected to each other along an insertion joint with a cohesive material joint, for example, proximate the adapter tube section recesses. In such a vehicle axle, any failure of the material joint does not result in a breakdown so that the vehicle is still operable for some time.

Abstract: In a rigid drive axle for a vehicle comprising an axle beam provided with a differential housing, at least two tubular axle sections extending in opposite directions from the differential housing and spring support brackets projecting laterally from the axle tube sections, the spring support brackets are integral parts of the axle tube sections facilitating adaptation to various automotive vehicles and forming a relatively low-weight structure which increases the ride comfort and driving safety and also provides for minimal tire wear.