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

1996-07-03

1998-04-07

Buffalow, E. Rollins

Stock material or miscellaneous articles

Composite

Of addition polymer from unsaturated monomers

428500, 428910, B32B 2732

Patent

active

057362580

ABSTRACT:
A shrink film comprising a blend of copolymers of ethylene and one or more alpha-olefins having 3 to 12 carbon atoms formed in situ, said blend having a melt index in the range of about 0.2 to about 3.5 grams per 10 minutes; a melt flow ratio in the range of about 50 to about 175; a molecular weight in the range of about 90,000 to about 225,000; a Mw/Mn ratio of at least about 8; and a density in the range of 0.910 to 0.940 gram per cubic centimeter, said shrink film being formed at a blow up ratio in the range of about 2:1 to about 6:1 and having the following properties:
(i) at about 135 degrees C., a shrinkage of at least about 50 percent in the machine direction and zero or positive shrinkage in the transverse direction;
(ii) melt stress is zero or positive kilopascals; and
(iii) a cooled stress of at least about 0.35.times.10.sup.3 kilopascals.

REFERENCES:
patent: 4814135 (1989-03-01), Heitz
patent: 5405901 (1995-04-01), Daniell et al.

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