Polyolefin composition and molded article thereof

C - Chemistry – Metallurgy – 08 – L

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C08L 23/10 (2006.01) C08L 23/12 (2006.01) C08L 23/14 (2006.01) C08L 53/00 (2006.01) B29C 49/00 (2006.01) C08L 23/08 (2006.01) C08L 23/16 (2006.01)

Patent

CA 2205205

A polyolefin composition which comprises 45 to 90 parts by weight of a propylene polymer (A) having a [] value of 0.5 to 10 dl/g and a Tm value of 100 ~C or above and comprising 100 to 80 mole % of propylene units, 0 to 10 mole % of ethylene units and 0 to 15 mole % of C4-C12 .alpha.-olefin units, and 5 to 40 parts by weight of an ethylene-.alpha.-olefin copolymer (B) having a [] value of 0.5 to 10 dl/g and comprising 70 to 95 mole % of ethylene units and 5 to 30 mole % of C4-C12 .alpha.-olefin units, and 2 to 25 parts by weight of a propylene-.alpha.-olefin-ethylene terpolymer (C) having a [] value of 0.5 to 10 dl/g and comprising 40 to 77 mole % of propylene units, 20 to 40 mole % of C4-C12 .alpha.-olefin units and 2 to 20 mole % of ethylene units (with the total amount of the components (A, B and C) being 100 parts by weight) and which is excellent in flexibility, transparency, mechanical strengths and heat resistance.

Composition de polyoléfine qui comporte 45 à 90 parties en poids d'un polymère de propylène (A) ayant une valeur [?] comprise entre 0,5 et 10 dl/g et une valeur Tm de 100 ~C ou plus et contenant 100 à 80 moles % d'unités de propylène, 0 à 10 moles % d'unités d'éthylène et 0 à 15 moles % d'unités d'.alpha.-oléfine C¿4?-C¿12?, 5 à 40 parties en poids d'un copolymère éthylène-.alpha.-oléfine (B) ayant une valeur [?] comprise entre 0,5 et 10 dl/g et contenant 70 à 95 moles % d'unités d'éthylène et 5 à 30 moles % d'unités d'.alpha.-oléfine C¿4?-C¿12?, et 2 à 25 parties en poids d'un terpolymère propylène-.alpha.-oléfine-éthylène (C) ayant une valeur [?] comprise entre 0,5 et 10 dg/l et contenant 40 à 77 moles % d'unités de propylène, 20 à 40 moles % d'unités d'.alpha.-oléfine C¿4?-C¿12? et 2 à 20 moles % d'unités d'éthylène (la quantité totale des constituants (A), (B) et (C) étant de 100 parties en poids), qui présente d'excellentes propriétés de souplesse, de transparence, de résistance mécanique et de résistance à la chaleur.

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