Cell size enlargers for polystyrene foams

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 9/00 (2006.01)

Patent

CA 2666108

Polymer extruded foams that contain cell size enlarging agents are provided. The inventive composition includes a foamable polymer material, at least one blowing agent, and at least one cell size enlarging agent. The blowing agent utilized in the inventive composition is preferably selected such that the composition has a zero ozone depletion and low global warming potential. Examples include any inorganic blowing agents and/or non-hydrogenated chlorofiuorocarbons (non-HCFCs). The foamable polymer material is preferably polystyrene. The cell size enlarging agent may be chosen from ethylene vinyl acetate (EVA) and/or ethylene methyl acrylate (EMA). The cell size enlarging agent permits the formation of a foam with large cell sizes that are desirable to achieve a high insulation value and to optimize the physical properties of the foamed product. In addition, the cell size enlarging agent provides an increased cell size to the foamed product without detracting from the physical and thermal properties.

L'invention concerne des mousses polymères extrudées qui contiennent des agents agrandissant la taille cellulaire. La composition de l'invention comprend un matériau polymère expansible, au moins un agent d'expansion et au moins un agent agrandissant la taille cellulaire. L'agent d'expansion utilisé dans la composition de l'invention est de préférence choisi de sorte que la composition soit neutre vis-à-vis de la diminution de l'ozone et présente un faible potentiel de réchauffement de la planète. Des exemples incluent n'importe quel agent d'expansion et/ou chlorofluorocarbure non hydrogéné (non HCFC). Le matériau polymère expansible est de préférence le polystyrène. L'agent agrandissant la taille cellulaire peut être choisi parmi le copolymère d'acétate de vinyle-éthylène (EVA) et/ou l'éthylène méthylacrylate (EMA). L'agent agrandissant la taille cellulaire permet la formation d'une mousse à grandes cellules qui sont souhaitées pour obtenir un degré d'isolation élevé et pour optimiser les propriétés physiques du produit expansé. De plus, l'agent agrandissant la taille cellulaire fournit au produit expansé doté de cellules de plus grande taille sans nuire aux propriétés physiques ou thermiques.

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