Process for preparing closed-cell water-blown rigid...

C - Chemistry – Metallurgy – 08 – G

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Details

C08G 18/76 (2006.01) C08G 18/10 (2006.01) C08G 18/18 (2006.01) C08G 18/40 (2006.01)

Patent

CA 2493102

The present invention is directed to a process for preparing water--blown rigid polyurethane foams having at least an 80% closed-cell content which involves reacting a) at least one polyol mixture which is composed of (i) at least one polymer polyol; (ii) at least one polyol having a hydroxyl value within the range of from about 200 to about 800; and (iii) optionally, at least one polyol having a hydroxyl value within the range of from about 25 to about 115; with b) at least one polymeric isocyanate and/or a prepolymer thereof; in the presence of c) optionally, at least one catalyst; d) water; and e) optionally, at least one additive or auxiliary agent. The present invention is also directed to the closed-cell water blown rigid polyurethane foams produced by the process of the present invention. The invention is further directed to a polyurethane-foam forming mixture which is used to produce the water-blown rigid polyurethane foams of the present invention. Foams produced according to the present invention have reduced friability and acceptable adhesion to substrates as well as acceptable compressive strength.

La présente invention concerne un procédé de préparation de mousses de polyuréthane rigides gonflées à l'eau, présentant au moins une teneur en alvéoles fermées de 80 %. Le procédé consiste à mettre en réaction: a) au moins un mélange de polyol composé de i) au moins un polyol de polymères; ii) au moins un polyol présentant une valeur hydroxyle comprise entre environ 200 et 800; et iii) éventuellement au moins un polyol présentant une valeur hydroxyle comprise entre environ 25 et 115; avec b) au moins un isocyanate polymérique et/ou un prépolymère dudit isocyanate; en présence de c) éventuellement au moins un catalyseur; d) de l'eau; et e) éventuellement au moins un additif ou un agent auxiliaire. L'invention concerne également des mousses de polyuréthane rigides à alvéoles fermées gonflées à l'eau, produites par le procédé de l'invention. Elle concerne en outre un mélange formant une mousse de polyuréthane utilisée pour produire les mousses de polyuréthane rigides gonflées à l'eau de l'invention. Des mousses préparées selon le procédé de l'invention présentent une friabilité réduite et un pouvoir d'adhérence à des substrats acceptable, ainsi qu'une résistance à la compression acceptable.

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