Alkenyl aromatic foam with low solubility hydrofluorocarbon

Details Alkenyl aromatic foam with low solubility hydrofluorocarbon Alkenyl aromatic foam with low solubility hydrofluorocarbon

C - Chemistry, Metallurgy

08

J

C08J 9/14 (2006.01) C08J 9/12 (2006.01) C08L 25/06 (2006.01) C08L 25/12 (2006.01)

Patent

CA 2681769

Prepare a closed-cell alkenyl aromatic polymer foam by an extrusion process using a blowing agent composition that contains at least 30 weight-percent of the chlorine-free hydrof luorocarbon blowing agent such that the foam has a density of 48 kilograms per cubic meter or less, contains more than 50 weight-percent styrene-acrylonitrile copolymer based on total polymer weight and at least eight weight- percent of a chlorine-free hydrof luorocarbon blowing agent that has a lower solubility in polystyrene than 1,1,2,2- tetrafluoroethane (HFC-134).

L'invention concerne la préparation d'une mousse polymère alcényle aromatique à cellules fermées au moyen d'un procédé d'extrusion utilisant une composition d'agent de soufflage qui contient au moins 30% en poids d'agent de soufflage d'hydrofluorocarbone exempt de chlore, de sorte que la mousse présente une densité de 48 kilogrammes par mètre cube ou moins, contient plus de 50 % en poids de copolymère de styrène-acrylonitrile basé sur le poids total du polymère et au moins 8% en poids d'un agent de soufflage d'hydrofluorocarbone exempt de chlore qui présente une solubilité inférieure dans le polystyrène à celle du1,1,2,2- tétrafluoroéthane (HFC-134).

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