Fabricated articles made from ethylene polymer blends
AssigneeThe Dow Chemical Company
InventorsPak-Wing Steve Chum, George W. Knight, Ronald P. Markovich, Shih-Yaw Lai
Life of this patent
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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
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 ethylene 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 melt index (I.sub.2) from about 0.001 grams/10 minutes (g/10 min.) to about 10 g/10 min.,
- (iii) a slope of strain hardening coefficient greater than or equal to 1.3, and
- (iv) a Composition Distribution Branch Index (CDBI) greater than 50 percent;
- 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 ethylene polymer characterized as having a density from about 0.93 g/cm.sup.3 to about 0.965 g/cm.sup.3 and comprising a linear polymer fraction, as determined using a temperature rising elution fractionation (TREF) technique.
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 ethylene 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 melt index (I.sub.2) from about 0.001 grams/10 minutes (g/10 min.) to about 10 g/10 min.,
- (iii) a slope of strain hardening coefficient greater than or equal to 1.3, and
- (iv) a Composition Distribution Branch Index (CDBI) greater than 50 percent;
- 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 ethylene polymer characterized as having a density from about 0.93 g/cm.sup.3 to about 0.965 g/cm.sup.3 and comprising a linear polymer fraction, as determined using a temperature rising elution fractionation (TREF) technique.
Dependencies are inferred from the claim text.