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) C08G 18/76 (2006.01)

Patent

CA 2520890

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 the reaction being carried out in a polyol having an equivalent weight of 500 or more wherein the polyol having an equivalent weight of 500 or more is a polyoxyethylene polyoxypropylene polyol having an oxyethylene content of 15-49% by weight calculated on the total oxyalkylene groups present wherein 20-80% of the oxyethylenegroups resides at the end of the polymer chains.

L'invention concerne un procédé destiné à la préparation d'un polyol comprenant une substance particulaire sous forme dispersée, consistant à faire réagir un polyisocyanate à base de MDI avec un polyol ayant un poids équivalent pouvant aller jusqu'à 400. La réaction est réalisée avec un polyol ayant un poids équivalent supérieur ou égal à 500, ce polyol étant un polyol de polyoxypropylène-polyoxyéthylène renfermant 15-49 % en masse d'oxyéthylène, sur la base des groupes oxyalkylène totaux présents, 20-80 % des groupes oxyéthylène étant situés aux extrémités des chaînes polymères.

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