Moldable lightly crosslinked blends of polyethylenes

Details Moldable lightly crosslinked blends of polyethylenes Moldable lightly crosslinked blends of polyethylenes

C - Chemistry, Metallurgy

08

L

400/6586

C08L 23/06 (2006.01)

Patent

CA 1191296

ABSTRACT OF THE DISCLOSURE A crosslinked polyethylene composition having excellent physical properties (e.g., a high stiffness, a high ESCR, and a high impact strength) and improved molding properties (e.g., an improved melt tension and an improved dye swell) is disclosed. This composition is obtained by lightly crosslinking and intimately melt blending a composition comprising a high- or medium-density polyethylene (A) having a high molecular weight and a high- or medium-density poly- ethylene (B) having; a low molecular weight, wherein , (i) the viscosity-average molecular weight of poly- ethylene (A) is 100,000 through 1,000,000, the viscosity- -average molecular weight of polyethylene B is 1,000 through 100,000, and the ratio of the molecular weight of polyethylene (A) to that of polyethylene (B) is 2 through 100, (ii) the blending ratio of polyethylene (A) to poly- ethylene (B) is 5:95 through 80:20, and (iii) (MI)1 is 0.01 through 3.5, the ratio of the expansion factor .alpha.2 to .alpha.1 (.alpha.2/.alpha.1) is 1.1 through 10, and the ratio of (MI)2 to (MI)1 [(MI)2/(MI)1] is 0.03 through 0.9, wherein (MI)1 and (MI)2 are melt indexes of the poly- ethylene compositions before and after crosslinking, respectively, and .alpha.1 and .alpha.2 are expansion factors of the poly- ethylene compositions before and after crosslinking, respectively.

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