C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 18/08 (2006.01) C08G 18/12 (2006.01) C08L 75/04 (2006.01)
Patent
CA 2177168
A process is disclosed for the production of thermoplastic polyurethanes by the combined thermoplastic treatment of a) a polyurethane and/or polyurethane polycarbamide with free hydroxyl groups and/or amino groups and b) a polyurethane and/or polyurethane polycarbamide obtainable by the isocyanate- polyaddition process with a characteristic number of above 100. The process is characterized by the fact that : i) in the production of component b) the characteristic number is between 110 and 150 and ii) in the thermoplastic treatment of components a) and b), the molar ratio of the theoretical isocyanate surplus of component b) to the free hydroxyl groups and/or amino groups content of component a) ranges from 1.02:1 (mol NCO:mol OH or NH2) to 100:1.
L'invention concerne un procédé de production de polyuréthanes thermoplastiques par traitement thermoplastique commun : a) d'un polyuréthane et/ou d'un polycarbamide de polyuréthane comportant des groupes hydroxyle libres et/ou amino et b) d'un polyuréthane et/ou d'un polycarbamide de polyuréthane, obtenu selon le procédé de polyaddition d'isocyanate, à un nombre caractéristique supérieur à 100. Ce procédé se caractérise en ce que : i) pendant la préparation du constituant b), on conserve un nombre caractéristique compris entre 110 et 150 et que ii) pendant le traitement thermoplastique des constituants a) et b), le rapport molaire du surplus numérique d'isocyanate du constituant b) à la teneur en groupes hydroxyle libres et/ou en groupes amino du constituant a) est compris entre 1,02:1 (Mol NCO : Mol OH et NH¿2?) et 100:1.
Meckel Walter
Quiring Bernd
Aktiengesellschaft Bayer
Swabey Ogilvy Renault
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