Broad distribution, high molecular weight low density...

Details Broad distribution, high molecular weight low density... Broad distribution, high molecular weight low density...

C - Chemistry, Metallurgy

08

F

400/6574

C08F 10/00 (2006.01) C08F 297/06 (2006.01) C08L 23/08 (2006.01)

Patent

CA 2033396

ABSTRACT OF THE DISCLOSURE mere is disclosed a low density polymer having a broad molecular weight distribution, such that its melt flow ratio (MFR) is about 50 to about 250, and a substantially constant melt index-corrected density. The polymer, produced e.g., by blending a first polymer component of high molecular weight with a second polymer component of low molecule weight, with both polymer components having substantially the same melt index-corrected density, produces films having improved strength properties and low hexane extractables, as compared to films made from comparable individual polymer components. mere is also disclosed a low density polymer, also having MFR of about 50 to about 250, having substantially no polymer chains having low molecular weight and short chain branches, which is prepared by blending a first polymer component of low density and high molecular weight with a second polymer ccmponent of relatively high density and relatively low molecular weight. The melt index-corrected densities of these two polymer components are dissimilar.

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