Improved rubber modified polystyrene

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 287/00 (2006.01) C08L 25/02 (2006.01) C08L 51/00 (2006.01)

Patent

CA 2170898

High impact polystyrene resins are provided having a surprisingly good combination of toughness and gloss characteristics. Such resins contain small (i.e. 0.1 to 0.4 micron) capsule morphology rubber particles in combination with relatively small (i.e. 0.25 to 1 micron) entanglement morphology rubber particles. It has been found that such resins are capable of providing izod impact strength values in the range of 2.5 to 3.5 ft-lb/in (133.4 to 186.7 J/m) and higher at an overall volume average rubber size of less than 0.4 micron with corresponding gloss values in excess of 90 percent.

L'invention se rapporte à des résines de polystyrène à résistance aux chocs élevée qui associent de manière singulière et bénéfique des caractéristiques de résistance et de brillance. Ces résines contiennent de petites particules (c-à-d 0,1 à 0,4 microns) de caoutchouc ayant la forme de capsules combinées à des particules de caoutchouc relativement petites (c-à-d 0,25 à 1 micron) ayant une configuration enchevêtrée. Il s'est avéré que ces résines pouvaient avoir des valeurs de résistance aux chocs selon Izod comprises entre 2,5 et 3,5 pied-livre/pouce (133,4 à 186,7 J/m), et supérieures à une grosseur de caoutchouc moyenne volumique globale inférieure à 0,4 micron avec des valeurs de brillance correspondantes dépassant 90 %.

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