Process for making a pipa-polyol

Details Process for making a pipa-polyol Process for making a pipa-polyol

C - Chemistry, Metallurgy

08

G

C08G 18/08 (2006.01) C08G 18/40 (2006.01)

Patent

CA 2581506

Process for preparing a polyol comprising particulate material in dispersed form by reacting an MDI-based polyisocyanate and a polyol having an equivalent weight of up to 400 in a relative amount such that the number of NCO-groups is 70-100% of the number of OH-groups in said polyol having an equivalent weight of up to 400, the reaction being carried out in a polyol having an equivalent weight of 500 or more. The polyols are claimed as well.

L'invention porte sur un procédé de préparation d'un polyol comprenant un matériau particulaire sous forme dispersée, ce procédé consistant à mettre à réagir un polyisocyanate à base de MDI et un polyol ayant un poids équivalent allant jusqu'à 400 dans une quantité relative de sorte que le nombre de groupes NCO soit compris entre 70 et 100 % du nombre de groupes OH dans le polyol ayant un poids équivalent allant jusqu'à 400, la réaction étant réalisée dans un polyol ayant un poids équivalent égal ou supérieur à 500. Les polyols de cette invention sont également revendiqués.

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