Polyolefin compositions and films obtained therefrom

C - Chemistry – Metallurgy – 08 – L

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C08L 23/08 (2006.01) C08L 23/14 (2006.01) C08L 23/20 (2006.01)

Patent

CA 2294237

Polyolefin compositions comprising from 70 to 99 parts by weight of a composition (A) comprising: (i) from 75 to 95 % by weight of a copolymer of ethylene with an .alpha.-olefin CH2=CHR, wherein R is an alkyl radical having from 1 to 10 carbon atoms; and (ii) from 5 to 25 % by weight of a copolymer of propylene with ethylene and/or an .alpha.-olefin CH2=CHR1, wherein R1 is an alkyl radical having from 2 to 10 carbon atoms and from 1 to 30 parts by weight of a polyolefin component (B) comprising crystalline polybutene-1. The polyolefin compositions of the invention are endowed with an improved processability while the films obtained therefrom show improved mechanical properties with respect to those of the prior art.

Compositions de polyoléfine comprenant de 70 à 99 parties en poids d'une composition (A) contenant (i) de 75 à 95 % en poids d'un copolymère d'éthylène avec une .alpha.-oléfine CH¿2?=CHR dans laquelle R représente un radical alkyle possédant de 1 à 10 atomes de carbone, et (ii) de 5 à 25 % en poids d'un copolymère de propylène avec éthylène et/ou une .alpha.-oléfine CH¿2?=CHR?1¿ dans laquelle R?1¿ représente un radical alkyle possédant de 2 à 10 atomes de carbone et de 1 à 30 parties en poids d'un constituant de polyoléfine (B) contenant polybutène-1 cristallin. Ces compositions de polyoléfine présentent une capacité de traitement améliorée, tandis que les feuils qu'elles permettent d'obtenir possèdent des propriétés mécaniques améliorées par rapport à celles de l'état actuel de la technique.

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