Polyurethane-isocyanurate casting systems with high heat...

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/79 (2006.01) C08G 18/09 (2006.01) C08G 18/10 (2006.01)

Patent

CA 2261222

The present invention relates to a polyurethane-isocyanurate casting system including an isocyanate component or isocyanate terminated prepolymer and a hardener. The hardener includes a polyol component, at least one trimerization catalyst, and, optionally, a poly(oxyalkylene) polyamine. The isocyanate component and hardener are blended at a volumetric ratio of between 2.5:1 and 1:1. The blend of component a and component b has an isocyanate index of from about 1.5 to about 4Ø The present invention further relates to a process employing the casting system and articles resulting from the casting system having a high head deflection temperature.

La présente invention concerne un système de coulage de polyuréthane-isocyanurate comprenant un composant isocyanate ou prépolymère à terminaison isocyanate et un durcisseur. Le durcisseur comprend un composant polyol, au moins un catalyseur de trimérisation et, facultativement, une polyamine poly(oxyalkylène). Le composant isocyanate et le durcisseur sont mélangés selon un rapport volumétrique de 2,5:1 et 1:1. Le mélange du composant (a) et du composant (b) présente un indice d'isocyanate d'environ 1,5 à environ 4,0. La présente invention se rapporte en outre à un procédé faisant appel à ce système de coulage, ainsi qu'à des articles obtenus par ce système de coulage présentant une stabilité dimensionnelle à des températures élevées.

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