Polyethylene blow molding composition for producing small...

C - Chemistry – Metallurgy – 08 – L

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C08L 23/04 (2006.01) C08F 297/08 (2006.01) C08L 23/06 (2006.01) C08L 23/08 (2006.01) C08L 53/00 (2006.01) B29C 47/40 (2006.01) B29C 49/04 (2006.01)

Patent

CA 2510063

The invention relates to a polyethylene composition with multi-modal molecular mass distribution, which is particularly suitable for blow molding of small containers with a volume in the range of from 200 to 5000 cm3 (= ml). The composition has a density in the range of from 0.955 to 0.960 g/cm3 at 23 ~C and an MFR190/5 in the range from 0.8 to 1.6 dg/min. It comprises from 45 to 55 % by weight of a low-molecular-mass ethylene homopolymer A, from 20 to 35 % by weight of a high-molecular-mass copolymer B made from ethylene and from another 1-olefin having from 4 to 8 carbon atoms, and from 20 to 30 % by weight of an ultrahigh-molecular-mass ethylene copolymer C.

L'invention concerne une composition de polyéthylène présentant une distribution des masses moléculaires multimodale, particulièrement adaptée au moulage par soufflage de petits contenants d'un volume compris entre 200 et 5000 cm?3¿ (= ml). Cette composition présente une masse volumique comprise entre 0,955 et 0,960 g/cm?3¿ à 23 ·C et un MFR¿190/5? (indice de fluidité à chaud) compris entre 0,8 à 1,6 dg/min. Cette composition contient 45 à 55 % en poids d'un homopolymère d'éthylène de faible poids moléculaire (A), 20 à 35 % en poids d'un copolymère de haut poids moléculaire (B) constitué d'éthylène et d'une autre 1-oléfine comportant 4 à 8 atomes de carbone, et 20 à 30 % en poids d'un copolymère d'éthylène de poids moléculaire extrêmement élevé (C).

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