Process for the preparation of thermoplastic polyurethanes

Details Process for the preparation of thermoplastic polyurethanes Process for the preparation of thermoplastic polyurethanes

C - Chemistry, Metallurgy

08

G

C08G 18/48 (2006.01) C08G 18/66 (2006.01)

Patent

CA 2233664

In a process for preparing thermoplastic polyurethanes by reacting (a) isocyanates with (b) compounds reactive toward isocyanates and having a molecular weight of from 500 to 10,000 g/mol, in the presence or absence of (c) chain extenders having a molecular weight of less than 500 g/mol, (d) catalysts and/or (e) customary auxiliaries and additives, the component (b) used comprises at least one polyether polyalcohol (bl) comprising polyoxypropylene and polyoxyethylene units and having a molecular weight of from 500 to 10,000 g/mol, an unsaturation of less than 0.07 meq/g and a primary hydroxyl group content of from 80 to 100 %.

Dans un procédé pour préparer des polyuréthanes thermoplastique par réaction (a) d'isocyanates avec (b) des composés réactifs vis-à-vis des isocyanates et possédant une masse molaire de 500 à 10 000 g/mole, en présence ou non (c) d'extenseurs de chaîne de masse molaire inférieure à 500 g/mole, (d) de catalyseurs et (ou) (e) de produits auxiliaires et d'additifs usuels, le constituant (b) utilisé comprend au moins un polyéther-polyalcool (bl) à base d'unités de polyoxypropylène et de polyoxyéthylène, avec une masse molaire de 500 à 10 000 g/mole, un taux d'insaturation inférieur à 0,07 méq./g et une teneur de 80 à 100 % en groupes hydroxyle primaire.

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