Polyethylene blends and films

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 23/04 (2006.01) C08J 5/18 (2006.01) C08L 23/16 (2006.01) C08L 23/06 (2006.01) C08L 23/08 (2006.01)

Patent

CA 2424942

A blend comprising a high molecular weight, medium density polyethylene (HMW, MDPE) and a linear low density polyethylene (LLDPE) is disclosed. The blend comprises from about 20 wt % to about 80 wt % of HMW MDPE. The HMW MDPE has a density from about 0.92 to about 0.944 g/cc, a melt index MI2 from about 0.01 to about 0.5 dg/min, and a melt flow ratio MFR from about 50 to about 300. The blend also comprises about 20 wt % to about 80 wt % of LLDPE. The LLDPE has a density within the range of about 0.90 to about 0.925 g/cc and an MI2 within the range of about 0.50 to about 50 dg/min. The blend provides films with significantly improved toughness and tear strength compared to MDPE or HDPE, and high modulus compared to LLDPE.

Cette invention concerne un mélange renfermant un polyéthylène à poids moléculaire élevé, de densité moyenne (HMW, MDPE), et un polyéthylène linéaire de faible densité (LLDPE). Ce mélange comprend de 20 à 80 % en poids environ de HMW MDPE. Le HMW MDPE a une densité comprise entre 0,92 et 0,944 g/cm?3 ¿environ, un indice de fusion MI¿2? Compris entre 0,01 et 0,5 dg/mn environ, et un rapport de fluidité situé entre 50 et 300 environ. Le mélange comprend également entre 20 et 80 % en poids environ de LLDPE. Le LLDPE a une densité comprise entre 0,90 et 0,925 g/cm?3¿ et un MI¿2? Situé entre 0,50 et 50 dg/mn environ. Ce mélange permet d'obtenir des films offrant une ténacité et une résistance au déchirement bien supérieures à celles de MDPE ou HDPE, et un module élevé comparé au LLDPE.

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