Short-chain polyethers for rigid polyurethane foams

C - Chemistry – Metallurgy – 08 – G

Patent

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C08G 65/26 (2006.01)

Patent

CA 2633672

The present invention provides a short-chain polyether polyol having a number average molecular weight of less than about 1,200 g/mole and produced by alkoxylating an initiator in the presence of a basic catalyst having at least one cation chelated with about 0.5 wt.% to about 20 wt.% of a polyoxyethylene-containing compound, wherein the weight percentages are based on the weight of the short-chain polyether polyol. The inventive short- chain polyols may be used to produce rigid polyurethane foams and non- cellular polyurethanes.

L'invention a trait à un polyol de polyéther à chaîne courte qui présente un poids moléculaire moyen en nombre inférieur à environ 1200 g/mole, et qui est produit par l'alcoxylation d'un amorceur en présence d'un catalyseur basique possédant au moins un cation chélaté avec 0,5 à 20 % poids environ d'un composé contenant du polyoxyéthylène, les pourcentages pondéraux étant basés sur le poids du polyol de polyéther à chaîne courte. Les polyols à chaîne courte selon l'invention peuvent servir à produire des mousses de polyuréthane rigides et des polyuréthanes non cellulaires.

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