Rigid polyurethane/polyisocyanurate foams containing...

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 9/08 (2006.01) C08G 18/48 (2006.01) C08J 9/00 (2006.01) C08K 5/01 (2006.01) C08L 75/04 (2006.01) E01B 9/14 (2006.01) E01B 31/26 (2006.01)

Patent

CA 2067085

The invention is a rigid polyurethane foam to which a base stock lubricating oil made of at least 55 weight percent paraffinic carbons and less than 10 weight percent aromatic carbons has been added as a hydrophobic agent protecting the polyurethane foam from reacting with environmental moisture. The foam is useful for deposit in railroad spike holes or any structural member having a cavity and where moisture within or on the cavity would otherwise react with the isocyanate to produce an uncontrollable foaming mass.

'invention est une mousse de polyuréthane rigide à laquelle on a ajouté une huile lubrifiante de support contenant au moins 55 % en poids d'hydrocarbures paraffiniques et moins de 10 % en poids d'hydrocarbures aromatiques à titre d'agent hydrophobe empêchant la mousse de polyuréthane de réagir avec l'humidité environnementale. La mousse de polyuréthane est utile pour remplir les trous destinés à recevoir les crampons d'attache des rails ou tout élément de structure possédant une cavité pour empêcher l'humidité, à l'intérieur ou autour de la cavité, de réagir avec l'isocyanate pour produire une masse qui mousse de manière non contrôlée.

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