Casting compounds based on polyurethane

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/66 (2006.01) B01D 63/02 (2006.01) C08G 18/12 (2006.01) C08G 18/79 (2006.01)

Patent

CA 2663855

The invention relates to a polyol mixture, comprising as components a1) at least one fat-based polyol, a2) at least one polyetherol having a number-average molecular weight of 500 to 2000 g/mol, and a3) possibly one or more cross-linking agents having a number-average molecular weight of 90 to 400 g/mol, wherein x) the number-average molecular weight of component a1) deviates from the number-average molecular weight of component a2) by no more than 400 g/mol, and xi) the OH functionalities of components a1) and a2) deviates from each other by no more than 0.5. These polyol mixtures can be used for the production of casting compounds on polyurethane basis. Furthermore, the invention relates to casting compounds based on the above-described polyol mixtures (A) and at least one modified isocyanate (B), and to the use of the casting compounds as potting material. The invention further relates to a method for the production of the above-described casting compounds. Additionally, the invention relates to dialysis filters comprising the above-described casting compounds. Finally, the invention relates to the combination of separately present components (A) and (B) for joint use.

L'invention concerne un mélange de polyol, qui contient en tant que composant a1 au moins un polyol à base de graisse, a2) au moins un polyétherol ayant un poids moléculaire moyen numérique de 500 à 2000 g/mole et a3) éventuellement un ou plusieurs réticulants ayant un poids moléculaire moyen numérique de 90 à 400 g/mole, x) le poids moléculaire moyen numérique du composant a1) s'écartant d'au plus 400 g/mole du poids moléculaire moyen numérique du composant a2) et x1) la fonctionnalité OH des composants a1) et a2) ne s'écartant pas l'une de l'autre de plus de 0,5. Ces mélanges de polyol peuvent être utilisés pour la fabrication de masses de scellement à base de polyuréthanne. L'invention concerne en outre des masses de scellement à base des mélanges de polyol (A) décrits en préambule et d'au moins un isocyanate (B) modifié, ainsi que l'utilisation des masses de scellement en tant que matériau d'enrobage. L'invention concerne en outre un procédé de fabrication des masses de scellement décrites en préambule. L'invention concerne en outre des filtres de dialyse, qui comprennent les masses de scellement décrites en préambule. L'invention concerne enfin la combinaison de composants (A) et (B) présents de manière séparée pour une utilisation commune.

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