Foam boards produced using halogen-free blowing agents

Details Foam boards produced using halogen-free blowing agents Foam boards produced using halogen-free blowing agents

C - Chemistry, Metallurgy

08

J

C08J 9/12 (2006.01)

Patent

CA 2163537

The invention concerns extruded cellular-plastic panels produced using halogen-free propellants from styrene-polymer thermoplastic having a Vicat softening temperature VST, measured using method B50, of, at the most, 100 °C and a melt volume-flow rate (MVR), measured at 200 °C and a load of 5 KG, of at least 5 ml/10 min. The panels are at least 20 mm, preferably more than 50 mm, and in particular 80 mm to 200 mm thick. Propellants preferred for the manufacture of the cellular-plastic panels are carbon dioxide alone and mixtures of carbon dioxide with ethanol and/or dimethyl ether.

L'invention concerne des plaques de mousse extrudées, fabriquées avec utilisation d'agents moussants non halogénés et constituées d'une matrice thermoplastique à base d'un polymère de styrène qui présente une température de ramollissement de Vicat VST B 50 de 100 DEG C au maximum et un indice de fluidité MVR 200/5 d'au moins 5 ml/10 min. Les plaques ont une épaisseur minimum de 20 mm, et de préférence supérieure à 50 mm et en particulier de 80 à 200 mm. Les agents moussants employés de préférence pour la fabrication des plaques de mousse sont le dioxyde de carbone employé seul, ainsi que des mélanges de dioxyde de carbone et d'éthanol et/ou de diméthyléther.

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