Polyolefin masterbatch and composition suitable for...

Details Polyolefin masterbatch and composition suitable for... Polyolefin masterbatch and composition suitable for...

C - Chemistry, Metallurgy

08

L

C08L 23/14 (2006.01) C08F 2/00 (2006.01) C08L 23/16 (2006.01)

Patent

CA 2564906

A masterbatch composition comprising (percent by weight): A) 15%-50% of a polypropylene component having a melt flow rate of from 1 to 250 g/10 min.; and B) 50%-85% of an olefin polymer partially soluble in xylene at room temperature, containing from 60% to 85% by weight of ethylene; said masterbatch composition having (i) a value of the intrinsic viscosity [rl] of the fraction soluble in xylene at room temperature ([rl]SOl) equal to or lower than 2.9 dl/g, and (ii) a value of the ratio MFR / [TI],,,, equal to or lower than 4, is added to polyolefin materials to obtain final compositions suitable for injection molding.

L'invention concerne une composition d'un mélange-maître comprenant (en pourcentage en poids) : A) 15-50% d'un composant de polypropylène présentant un indice de fluidité compris entre 1 et 250 g/10 min ; et B) entre 50 et 85% d'une oléfine polymère partiellement soluble dans du xylène à température ambiante, contenant entre 60 et 85% en poids d'éthylène ; ladite composition de mélange-maître présentant (i) une valeur de viscosité intrinsèque [.eta.] de la fraction soluble dans le xylène à température ambiante ([.eta.]¿sol?) inférieure ou égale à 2,9 dl/g, et (ii) une valeur du rapport MFR / [.eta.]¿sol? inférieure ou égale à 4, est ajoutée aux matières de polyoléfine, ce qui permet d'obtenir des compositions finales convenant au moulage par injection.

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