Polyolefinic compositions having good whitening resistance

C - Chemistry – Metallurgy – 08 – L

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C08L 23/14 (2006.01) C08L 23/10 (2006.01)

Patent

CA 2610030

A polypropylene composition comprising 65-77 wt% of a crystalline propylene polymer, 8 to less than 13 wt% of an elastomeric copolymer and 10-23 wt% of polyethylene. The said composition exhibits a flexural modulus value higher than 1300 MPa, stress-whitening resistance values corresponding to a diameter of the whitened area of at most 1.7 cm caused by a ram falling from a 76 cm height and a diameter of the whitened area of at most 1.2 cm caused by a ram falling from a 20 cm height, and a value of Izod impact resistance at 23~ C more than 14 kJ/m2 and the one at -20~ C at least 5 kJ/m2.

Composition de propylène qui contient 65 à 77 % en poids d'un polymère de propylène cristallin, 8 à moins de 13 % en poids d'un copolymère élastomère et 10 à 23 % en poids de polyéthylène. Ladite composition possède une valeur de module d'élasticité en flexion supérieure à 1300 MPa, des valeurs de résistance au blanchissement par contrainte correspondant à un diamètre de la zone blanchie de 1,7 cm au plus provoquée par la chute d'un bélier tombant d'une hauteur de 76 cm et à un diamètre de la zone blanchie de 1,2 cm au plus provoquée par la chute d'un bélier tombant d'une hauteur de 20 cm, et une valeur de résistance aux chocs Izod supérieure à 14 kJ/m2 à 23 °C et d'au moins 5 kJ/m2 à 20 °C.

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