Tetrafunctional initiator

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 25/02 (2006.01) C08L 9/00 (2006.01) C08L 33/06 (2006.01) C08L 33/18 (2006.01) C08L 51/04 (2006.01)

Patent

CA 2440206

The melt of polyvinyl aromatic polymers comprising from 10 to 45 weight % of star branched polymer prepared using a combination of thermal and tetra functional peroxide initiation has an improved melt strength permitting better foam formation for extrusion foam blown with conventional blowing agents and inert gases including CO2 and an improved tensile strength for oriented polystyrene (OPS) articles, e.g. blown film or extruded sheet.

Selon l'invention, une composition à l'état fondu de polymères polyvinyliques aromatiques comprenant de 10 à 45 % en poids de polymère en étoile, préparée en utilisant une combinaison d'initiateurs thermique et à base de peroxyde tétrafonctionnel, possède une résistance améliorée à l'état fondu permettant une meilleure formation de mousse à l'extrusion-soufflage avec des agents de soufflage conventionnels et des gaz inertes, notamment CO¿2?, et une résistance à la traction améliorée pour des articles en polystyrène orienté, notamment film soufflé ou feuille extrudée.

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