Styrenic polymer resins achieving improved gloss and impact...

C - Chemistry – Metallurgy – 08 – L

Patent

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C08L 53/02 (2006.01) C08L 25/06 (2006.01) C08L 51/04 (2006.01) C08L 9/00 (2006.01)

Patent

CA 2187276

A polystyrene based composition is provided having high impact strength and gloss. The gloss is particularly noted when the resin is molded into plastic articles, especially at relatively cooler temperatures, such as 80 °F to 100 °F. The composition contains three resins. The first resin comprises polystyrene and rubber particles smaller than 1.0 micron, such as 0.2 to 0.6 microns. The second resin comprises polystyrene and rubber particles larger than 1.0 micron. The third resin preferably is a block copolymer of styrene and butadiene. Unexpectedly, the third resin improves the gloss achieved by the overall composition.

Composition à base de polystyrène présentant une forte résistance aux chocs et une brillance améliorée. La brillance se remarque particulièrement lorsque la résine est moulée pour obtenir des articles en plastique, surtout à des températures relativement basses, telles que 80 ~F à 100 ~F. Ladite composition contient trois résines. La première résine comporte des particules de polystyrène et de caoutchouc de taille inférieure à 1,0 micron, plus précisément entre 0,2 et 0,6 micron. La deuxième résine comporte des particules de polystyrène et de caoutchouc de taille supérieure à 1,0 micron. La troisième résine est de préférence un copolymère séquencé de styrène et de butadiène. Ladite troisième résine améliore de façon inattendue la brillance de la composition globale.

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