Method of purifying polyether polyols of non-volatile...

C - Chemistry – Metallurgy – 08 – G

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C08G 65/30 (2006.01)

Patent

CA 2558456

The subject invention provides polyurethane foam and a method of purifying polyether polyols of non-volatile impurities for use in forming the polyurethane foam. The method includes the step of providing a crude polyether polyol having a non-volatile impurity present therein. The crude polyether polyol is contacted with an adsorbent selected from at least one of activated carbon, diatomaceous earth, charcoal, attapulgite, and clay to remove the impurity and filtered to form a purified polyether polyol. The filtering of the crude polyether polyol is carried out through a filter media that is used both in a pre-filtering step prior to adding the adsorbent and the filtering step to remove the adsorbent to reduce losses of the purified polyether polyol because of its high viscosity. The purified polyether polyol is then used to form a polyurethane foam having improved stability.

L'invention concerne une mousse de polyuréthanne et un procédé pour purifier des polyols de polyéther afin d'évacuer les impuretés non volatiles qui doivent s'utiliser dans la mousse de polyuréthanne. Le procédé consiste à fournir un polyol de polyéther brut comprenant une impureté non volatile. Le polyol de polyéther brut est mis en contact avec un adsorbant sélectionné parmi au moins le charbon actif, l'eau diatomaceuse, le charbon de bois, l'attapulgite et la terre glaise, pour évacuer les impuretés et effectuer le filtrage afin de former un polyol de polyéther purifié. Le filtrage du polyol de polyéther brut est effectué via un support filtrant qui est utilisé au stade de préfiltrage avant l'ajout d'un adsorbant, et le stade de filtrage vise à évacuer l'adsorbant pour réduire les pertes de polyol de polyéther purifié en raison de sa viscosité élevée. Le polyol de polyéther purifié est ensuite utilisé pour former une mousse de polyuréthanne possédant une stabilité améliorée.

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