Film extruded from an in situ blend of ethylene copolymers

Details Film extruded from an in situ blend of ethylene copolymers Film extruded from an in situ blend of ethylene copolymers

1994-07-08

1996-05-07

Seccuro, Jr., Carman J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Physical dimension specified

525240, 525320, 525321, 525324, C08L 2308, C08L 2320

Patent

active

055144551

ABSTRACT:
A film comprising a blend of copolymers, which has been (i) extruded to a gauge in the range of about 0.3 to about 0.9 mil, said film having an Elmendorf Tear Strength in the machine direction of at least about 25 grams per mil greater than the Elmendorf Tear Strength in the machine direction of the same blend of copolymers, which has been extruded to a gauge of one mil, or (ii) extruded to a heavy gauge of at least about 5 mils and then biaxially oriented and reduced to a gauge of about 1.5 mils or less, first in the machine direction at a gauge reduction ratio of at least about 2:1, and then in the transverse direction at a gauge reduction ratio of at least about 1.5:1, said blend having been produced in situ by contacting ethylene and at least one alpha-olefin comonomer having 3 to 8 carbon atoms with a magnesium/titanium based catalyst system in each of two reactors connected in series, under polymerization conditions.

REFERENCES:
patent: 4438238 (1984-03-01), Fukushima et al.
patent: 5082902 (1992-01-01), Gurevitch et al.
patent: 5102955 (1992-04-01), Calabro et al.
patent: 5126398 (1992-06-01), Lee et al.
patent: 5284613 (1994-01-01), Ali et al.

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