Use of liquid carbon dioxide as a blowing agent in the...

C - Chemistry – Metallurgy – 08 – G

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C08G 18/00 (2006.01) C08J 9/06 (2006.01) C08J 9/12 (2006.01) C08J 9/14 (2006.01)

Patent

CA 2069878

A process for the production of an open cell polyurethane foam comprises the mixing of the following components at ambient temperatures in a mixing zone: a diisocyanate having a functionality of at least about 2.0, at least one hydrogen donor, at least one surfactant which is effective in forming an open cell polyurethane foam, at least one catalyst, and a blowing agent comprising a gas having a boiling point below approximately -100°F at atmospheric temperature and pressure which preferably comprises carbon dioxide. In addition, the mixture may also optionally contain water. The mixture is subjected to a pressure in said mixing zone which is sufficient to maintain the blowing agent in the liquid state at ambient temperatures. After mixing the mixture is ejected from the mixing zone to atmospheric pressure, thereby completely and instantaneously vaporizing the blowing agent to provide expansion of the mixture. The resultant foam is then cured at ambient temperatures.

Méthode pour la production de mousse de polyuréthane à cellules ouvertes, consistant à mélanger les constituants suivants à température ambiante dans une zone de mélange : un diisocyanate possédant une fonctionnalité d'au moins 2,0 environ, au moins un donneur d'hydrogène, au moins un surfactif permettant d'obtenir une mousse de polyuréthane à cellules ouvertes, au moins un catalyseur et un agent d'expansion contenant un gaz avec un point d'ébullition inférieur à environ -100 °F, à la température et pression atmosphériques et de préférence avec présence de dioxyde de carbone. De plus, le mélange peut aussi, facultativement, renfermer de l'eau. Le mélange est soumis à une pression dans ladite zone de mélange, qui est suffisante pour maintenir l'agent d'expansion à l'état liquide aux températures ambiantes. Après mélange, le produit est éjecté de la zone de mélange vers la pression atmosphérique, ce qui vaporise complètement et instantanément l'agent d'expansion en assurant le gonflement du mélange. La mousse résultante est ensuite réticulée à la température ambiante.

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