Impact-resistant polyolefin compositions

Details Impact-resistant polyolefin compositions Impact-resistant polyolefin compositions

C - Chemistry, Metallurgy

08

L

C08L 23/10 (2006.01) C08L 23/08 (2006.01) C08L 53/00 (2006.01) C08F 297/08 (2006.01)

Patent

CA 2349297

Polyolefin compositions comprising (percent by weight) A) 60%-95% of a crystalline polypropylene component having a Melt Flow Rate (MFR A) value of from 2.5 to 50 g/10 min. and containing from 20% to 80% of a fraction A I) having MFR I from 0.5 to 8 g/10 min., and from 20% to 80% of a fraction A II); B) 5%-40% of a copolymer of ethylene with one or more C4-C10 .alpha.-olefin(s) containing from 10 to 40% of said C4-C10 .alpha.-olefin(s); the ratio MFR A/MFR I being from 2 to 25; the percentages of A) and B) being referred to the sum of A) and B), and the percentages of A I) and A II) being referred to the sum of A I) and A II).

L'invention concerne des compositions de polyoléfine comportant (en pourcentage de poids) A) 60 % à 95 % d'un composant de polypropylène cristallin possédant une valeur de taux de fusion (MFR<A>) comprise entre 2,5 et 50 g/10 min et comprenant entre 20 % et 80 % d'une fraction A<I>) possédant une valeur de MFR<I> entre 0,5 et 8 g/10 min, et entre 20 % et 80 % d'une fraction A<II>); B) 5 % à 40 % d'un copolymère d'éthylène avec un ou plusieurs C4-C10 alpha -oléfine(s) contenant entre 10 et 40 % dudit C4-C10 alpha -oléfine(s); la valeur MFR<A>/MFR<I> étant comprise entre 2 et 25; les pourcentages de A) et B) se référant au total obtenu en ajoutant A) et B), et les pourcentages de A<I>) et A<II>) se référant au total obtenu en ajoutant A<I>) et A<II>).

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