Foaming urethane composition and methods of using such...

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/32 (2006.01) B32B 5/20 (2006.01) C08G 18/36 (2006.01) C08J 9/04 (2006.01)

Patent

CA 2301021

This invention relates to a foamable composition comprising at least two parts. More specifically, the first part comprises at least one polyol, at least one gelling agent, and at least one blowing agent wherein the first part comprises an effective amount of hydrophobic ingredients and a second part comprising at least one isocyanate. A foam mass can be prepared by a method of combining a polyol component with an isocyanate component substantially free of urethane prepolymer and applying the mixture to a void or substrate. The invention also relates to methods of using certain polyurethane compositions in the repair of surface defects or for the reinforcement of structural members such as spike holes left after spike removal from railroad ties during road bed maintenance or repair. This invention further relates to a method of foaming certain polyurethane compositions in the presence of water.

L'invention concerne une composition expansible comprenant au moins deux parties. Plus spécifiquement, la première partie renferme au moins un polyol, au moins un gellifiant, et au moins un gonflant, et ladite partie renferme aussi une quantité efficace d'éléments hydrophobes. Une seconde partie renferme au moins un isocyanate. Une masse de mousse peut être élaborée via un procédé qui consiste à combiner un polyol et un isocyanate sensiblement dépourvu de prépolymère d'uréthanne, et à appliquer le mélange à une cavité ou à un substrat. L'invention concerne également des procédés relatifs à l'utilisation de certaines compositions de polyuréthanne dans la réparation des défauts de surface ou pour le renforcement d'éléments structurels, comme dans le cas des trous de crampon laissés après le retrait des crampons de traverse de chemin de fer au cours de la maintenance ou de la réparation du talus des voies ferrées. L'invention concerne en outre un procédé relatif au gonflement de certaines compositions de polyuréthanne en présence d'eau.

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