Use of polydiene diols in thermoplastic polyurethanes

C - Chemistry – Metallurgy – 08 – G

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C08G 18/69 (2006.01) C08G 18/62 (2006.01)

Patent

CA 2224730

Thermoplastic polyurethanes are formed from a polydiene diol, preferably a hydrogenated polybutadiene diol, having from 1.6 to 2 terminal hydroxyl groups per molecule and a number average molecular weight between 500 and 20,000, an isocyanate having two isocyanate groups per molecule, and optionally a chain extender having two hydroxyl groups per molecule. The thermoplastic polyurethane composition is prepared by a prepolymer method, preferably a solventless prepolymer method using the branched chain extender.

Les polyuréthanes thermoplastiques sont formés à partir d'un diol de polydiène, de préférence un diol de polybutadiène hydrogéné, ayant de 1,6 à 2 groupes hydroxyle terminaux par molécule et un poids moléculaire moyen en nombre compris entre 500 et 20 000, d'un isocyanate comprenant deux groupes isocyanate par molécule, et éventuellement d'un allongeur de chaîne comportant deux groupes hydroxyle par molécule. La composition de polyuréthane thermoplastique est préparée par un procédé de prépolymère, de préférence un procédé de prépolymère sans solvant utilisant l'allongeur de chaîne ramifiée.

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