Ethylene polymer film made from ethylene polymer blends
AssigneeThe Dow Chemical Company
InventorsPak-Wing Steve Chum, Ronald P. Markovich, George W. Knight, Shih-Yaw Lai
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Abstract
Fabricated articles made from formulated ethylene polymer compositions are disclosed. Films made from such formulated compositions have surprisingly good impact and tensile properties, and an especially good combination of modulus and toughness. The ethylene polymer compositions have at least one homogeneously branched substantially linear ethylene/.alpha.-olefin interpolymer and at least one heterogeneously branched ethylene polymer. The homogeneously branched substantially linear ethylene/.alpha.-olefin interpolymer has a density from about 0.89 to about 0.92 g/cm.sup.3 and a slope of strain hardening coefficient greater than or equal to about 1.3.
Claims16
A film made from an ethylene polymer composition, wherein the composition comprises (A) from about 10 percent (by weight of the total composition) to about 95 percent (by weight of the total composition) of at least one homogeneously branched linear ethylene/.alpha.-olefin interpolymer having:
- (i) a density from about 0.89 grams/cubic centimeter (g/cm.sup.3) to about 0.935 g/cm.sup.3,
- (ii) a molecular weight distribution (M.sub.w /M.sub.n) from about 1.8 to about 2.8,
- (iii) a melt index (I.sub.2) from about 0.001 grams/10 minutes (g/10 min) to about 10 g/10 min,
- (iv) no high density fraction,
- (v) a single melting peak as measured using differential scanning calorimetry, and
- (vi) a slope of strain hardening coefficient greater than or equal to 1.3;
- and
- (B) from about 5 percent (by weight of the total composition) to about 90 percent (by weight of the total composition) of at least one heterogeneously branched linear ethylene polymer having a density from about 0.93 g/cm.sup.3 to about 0.965 g/cm.sup.3.
An ethylene polymer composition comprising (A) from about 10 percent (by weight of the total composition) to about 95 percent (by weight of the total composition) of at least one homogeneously branched linear ethylene/.alpha.-olefin interpolymer having:
- (i) a density from about 0.89 grams/cubic centimeter (g/cm.sup.3) to about 0.935 g/cm.sup.3,
- (ii) a molecular weight distribution (M.sub.w /M.sub.n) from about 1.8 to about 2.8,
- (iii) a melt index (I.sub.2) from about 0.001 grams/10 minutes (g/10 min) to about 10 g/10 min,
- (iv) no high density fraction,
- (v) a single melting peak as measured using differential scanning calorimetry, and
- (vi) a slope of strain hardening coefficient greater than or equal to 1.3;
- and
- (B) from about 5 percent (by weight of the total composition) to about 90 percent (by weight of the total composition) of at least one heterogeneously branched linear ethylene polymer having a density from about 0.93 g/cm.sup.3 to about 0.965 g/cm.sup.3.
Dependencies are inferred from the claim text.