Polyethylene useful for producing film and molded articles...

B - Operations – Transporting – 65 – D

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B65D 65/38 (2006.01) B29C 49/04 (2006.01) B29C 49/06 (2006.01) B65D 30/02 (2006.01)

Patent

CA 2663929

Applicants have discovered that certain polyethylene (PE) homopolymers or copolymers of ethylene and C3 to C-f o alpha-olefin monomers are more suitable for oriented processes than other polyethylene resins. In an aspect, the PE has a MFI of 0.3 g/10 min. to 5.0 g/10 min,, a melting point of from 11O0C to 140°C, a density of from 0.912 g/cm3 to 0.965 g/cm3(%), a haze of 10% or less, a clarity of at least 90, and a gloss of at (east 60. The polyethylene is heated and formed into an article, cooled, and then the article is stretch oriented. In an embodiment, the film, tape, the melt extruded, injection blow molded, injection stretch blow molded, cast, and thermoformed articles that can be produced with this polyethylene has a thickness of 0.1 miI to 100 mils. The polyethylene exhibits excellent elasticity, toughness, stretch and optical properties for such applications.

Selon l'invention, certains homopolymères ou copolymères de polyéthylène (PE) d'éthylène et des monomères C3 à C-f o alpha oléfine conviennent mieux pour des procédés orientés que d'autres résines de polyéthylène. Dans un aspect, PE présente un MFI compris entre 0,3 g/10mn et 5,0 g/10 mn, un point de fusion compris entre 110°C et 140°C, une densité comprise entre 0,912 g/cm3(%) et 0,965 g/cm3(%), un trouble n'excédant pas 10%, une clarté d'au moins 90, et un brillant d'au moins 60. Le polyéthylène est chauffé et formé en un article, puis refroidi, et ensuite l'article est orienté par étirement. Dans un mode de réalisation, le film, la bande, le fondu extrudé, des articles moulés-soufflés par injection, des articles moulés par étirement par injection, des articles thermoformés par emboutissage, que l'on peut produire avec du polyéthylène ont une épaisseur comprise entre 0,1 et 100 mils. Le polyéthylène offre d'excellentes propriétés d'élasticité, de ténacité, d'étirement ainsi que d'excellentes propriétés optiques pour de telles applications.

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