Rigid polyurethane foams and method to form said foams using...

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/32 (2006.01) C08G 18/38 (2006.01) C08G 18/72 (2006.01) C08J 9/08 (2006.01)

Patent

CA 2329299

The present invention is a polyurethane foam comprising the reaction product of a first reactant comprised of a polyisocyanate having an average isocyanate functionality of at least 2 and a second reactant comprised of a low molecular weight compound that has at least two to, at most, three groups containing an active hydrogen and water, wherein the reaction product is formed essentially in the absence of a cross-linking polyol and the polyurethane foam is substantially rigid. The invention is also a method of forming the polyurethane foam by contacting the first and second reactant for a time and temperature sufficient to form the foam.

La présente invention concerne une mousse de polyurétane comprenant le produit de réaction, d'une part d'un premier agent de réaction constitué d'un polyisocianate présentant une fonctionnalité isocyanate moyenne d'au moins 2, et d'autre part d'un second agent de réaction comprenant un composé de faible masse moléculaire comportant au moins deux et au plus trois groupes contenant un hydrogène actif et de l'eau. En l'occurrence, le produit de réaction se forme sensiblement en l'absence de polyol de réticulation, ce qui fait que la mousse de polyurétane est sensiblement rigide. L'invention concerne également un procédé de formation de la mousse de polyurétane consistant à mettre en contact le premier et le second des agents de réaction pendant une période et à une température qui suffisent pour la formation de la mousse.

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