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AssigneeBASF SE
InventorsOliver Steffen Henze, Ruediger Krech, Frank Prissok, Karin Scheffer, Frank Schaefer, Heinrich Niermann
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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.
A process for the preparation of thermoplastic polyurethane by reacting (a) the isocyanate diphenylmethane 4,4′-diisocyanate 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, optionally in the presence of (d) catalysts and/or (e) conventional additives, wherein the chain extender is a mixture consisting of a main chain extender 1,4-butanediol (c1) and a co-chain extender 1,3-propanediol (c2) and the thermoplastic polyurethane prepared has a rigid phase fraction of greater than 0.40, said rigid phase fraction being defined by the following formula:
A ski shoe based on thermoplastic polyurethane prepared by reacting (a) diphenylmethane 4,4′-diisocyanate 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, optionally in the presence of (d) catalysts and/or (e) conventional additives, wherein the chain extender (c) is a mixture consisting of a main chain extender 1,4-butanediol (c1) and a co-chain extender 1,3-propanediol (c2) wherein the proportion of n1 of the main chain extender (c1), based on the total amount of n of the chain extender (c) used, is from 0.80 to 0.999.
Dependencies are inferred from the claim text.