Preparation of machine direction oriented polyethylene films

Details Preparation of machine direction oriented polyethylene films Preparation of machine direction oriented polyethylene films

C - Chemistry, Metallurgy

08

L

C08L 23/04 (2006.01) C08L 23/06 (2006.01) C08L 23/08 (2006.01) C08L 23/16 (2006.01)

Patent

CA 2473805

A process for making MD (machine direction) oriented polyethylene film is disclosed. The process comprises blending a high-molecular weight, medium- density polyethylene (HMW MDPE) and a linear low-density polyethylene (LLDPE), converting the blend into a thick film, and orienting the thick film into a thinner film in the machine direction. The resulting film has high modulus, high gloss, low haze, and relatively high MD tear and dart impact.

L'invention concerne un procédé permettant de fabriquer un film de polyéthylène orienté dans le sens machine (MD). Ce procédé consiste à mélanger un polyéthylène à densité moyenne et à poids moléculaire élevé (HMW MDPE) et un polyéthylène linéaire à basse densité (LLDPE); à transformer le mélange en un film épais; puis, à transformer ce film épais en film plus mince, dans le sens machine. Le film ainsi obtenu présente un module élevé, un brillant important, un trouble peu important et une résistance à la déchirure dans le sens machine et une résistance aux chocs relativement élevées.

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