Transparent, compact polyurethane casting compositions that...

C - Chemistry – Metallurgy – 08 – G

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402/151, 167/328

C08G 18/48 (2006.01) A61L 27/34 (2006.01) A61L 27/48 (2006.01) B01D 63/02 (2006.01) C08G 18/10 (2006.01) C08G 18/76 (2006.01)

Patent

CA 2014516

The invention relates to transparent, substantially compact polyurethane casting compositions, sterilizable with superheated steam, which are prepared by the reaction of: A) modified diphenylmethane diisocyanates (A) that are liquid at 23°C and are in turn are obtained by the reaction of 1) a diphenylmethane diisocyanate isomer mixture, which in terms of 100 parts by weight comprises 60 to 90 parts by weight of 4,4'-diphenylmethane diisocyanate, 40 to 8 parts by weight of 2, 4'-diphenylmethane diisocyanate, and 0 to 5 parts by weight of 2,2'-diphenylmethane diisocyanate with 2) at least one polyoxypropylene polyol initiated with glycerine and/or trimethylol propane, having a molecular weight of 350 to 800 with a ratio of -33- NCO:OH groups of 2.5:1 to 15:1, with B) at least one compound having at least two reactive hydrogen atoms in the presence or absence of C) catalysts, as well as to a process for preparing the polyurethane casting compounds and their use for medical-technical articles. -34-

Compositions de moulage à base de polyuréthane, transparentes et relativement compactes, stérilisables par la vapeur surchauffée et préparées par réaction de : A) diisocyanates de méthylènediphényle (A), liquides à 23 degrés C et qui sont eux-mêmes obtenus par réaction 1) d'un mélange d'isomères de diisocyanates de méthylènediphényle, renfermant sur 100 parties en poids, de 60 à 90 parties de diisocyanate de 4,4'-méthylènediphényle, de 4 à 8 parties de diisocyanate de 2, 4'-méthylènediphényle et de 0 à 5 parties de diisocyanate de 2, 2'-méthylènediphényle, avec 2) au moins un polyoxypropylène-polyol possédant une masse moléculaire de 350 à 800 pour un rapport NCO/OH de 2,5:1 à 15:1, et la glycérine et (ou) le triméthylol propane comme initiateur; avec B) au moins un composé renfermant au moins deux atomes d'hydrogène réactifs en présence ou en l'absence de C) catalyseurs; méthode pour préparer les composés de moulage à base de polyuréthane et leur utilisation dans des articles médico-techniques.

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