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US 2003/0144426 A1Published application
Preparation of machine direction oriented polyethylene films
AssigneeEquistar Chemicals, LP
InventorKelly L. Williams
Life of this patent
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Abstract
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.
Claims8
A process for preparing a film, said process comprising:
- (a) blending
- (i) from about 20 wt % to about 80 wt % of a high-molecular weight, medium density polyethylene that has a density within the range of about 0.92 to about 0.94 g/cc, an MI2 within the range of about 0.01 to about 0.5 dg/min, an MFR within the range of about 50 to about 300, and a multimodal molecular weight distribution comprising a low-molecular weight component and a high-molecular weight component wherein the low molecular weight component has an MI2 from about 50 to about 600 dg/min and a density from about 0.94 to about 0.97 g/cc;
- and
- (ii) from about 20 wt % to about 80 wt % of a linear low-density polyethylene that has a density within the range of about 0.90 to about 0.93 cc/g and an MI2 within the range of about 0.5 to about 50 dg/min;
- (b) converting product of step (a) into a film;
- and
- (c) orienting the film of step (b) uniaxially in the machine direction.
4 more elements
Dependencies are inferred from the claim text.