Acrylic polymer capstock with improved adhesion to...

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 33/10 (2006.01) B32B 27/08 (2006.01) C08L 25/06 (2006.01) C08L 33/12 (2006.01)

Patent

CA 2353036

Disclosed is a composite sheeting comprised of polystyrene having a thin protective layer of an acrylic ester polymer and a process for producing the composite sheeting. The process comprises joining a molten stream of each polymeric material in a single extruder discharge conduit such that there is produced a single molten stream having a reasonably well defined interface between the two types of polymeric material, and thereafter, passing the resulting single stream of material through a sheet-form extrusion die having its die lips generally aligned with the foregoing interface.

On présente un revêtement composite à base de polystyrène avec une fine couche protectrice d'ester acrylique (un polymère) ainsi qu'un procédé permettant de fabriquer un tel revêtement. Le procédé consiste à réunir un flux de chaque matière polymérique à l'état fondu dans un seul conduit de sortie d'extrudeuse, de manière à obtenir un seul flux de matière à l'état fondu dans laquelle l'interface entre les deux types de polymères est raisonnablement bien définie, puis à faire passer le flux de ces matières réunies dans une filière d'extrudeuse en forme de feuille dont les rebords sont généralement alignés avec l'interface mentionnée précédemment.

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