Dispersion polyols for hypersoft polyurethane foam

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/48 (2006.01) C08G 18/40 (2006.01) C08G 18/65 (2006.01) C08G 65/26 (2006.01) C08L 71/02 (2006.01)

Patent

CA 2337206

Dispersion polyols which are liquid-liquid dispersions containing a first polyol having a substantially polyoxypropylene internal block having an equivalent weight in excess of about 700 Da and a high oxyethylene- content external block, and a second polyol which is a substantially polyoxyethylene polyol containing minimally 50 weight percent oxyethylene moieties. The dispersion polyols are stable and exhibit broad processing latitude when preparing hypersoft polyurethane foams. The dispersion polyols are advantageously prepared in situ, preferably in the presence of a double metal cyanide oxyalkylation catalyst.

Divulgation de polyols de dispersion qui sont des dispersions liquide-liquide contenant un premier polyol, ayant une séquence intérieure substantielle de polyoxypropylène ayant un poids équivalent supérieur à environ 700 Da et une séquence extérieure à haute teneur en oxyéthylène, et un deuxième polyol qui est un polyol de polyoxyéthylène renfermant au minimum 50 pour cent en poids d'unités d'oxyéthylène. Ces polyols de dispersion sont stables et présentent de larges possibilités de traitement lors de la préparation de mousses de polyuréthane hypermolles. Il est avantageux de préparer ces polyols de dispersion in situ, de préférence en présence d'un catalyseur d'oxyalkylation à cyanure de deux métaux.

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