Appeal No. 1996-0328
Application 08/060,891
and one or more alpha-olefins.” The VLDPE polymers are said to have a density between 0.860 and
0.915 g/cm . Simultaneously copolymerized ethylene, 1-hexene and 1-butene form the VLDPE3 4
terpolymer of the claimed biaxially stretched films. The claims require the terpolymer to have a density less
than 0.915 g/cm . Some claims specify the melt index, melt flow ratio (MFR), molecular weight3
distribution, amount of ethylene and the amount of 1-hexene. The film is said to be suitable for packaging
a variety of articles including food such as poultry, fresh red meat and processed meats and cheeses.5
Representative claims 1, 9, 11, 15, 18, 19, 21, 22 and 36 are reproduced below:
1. A biaxially stretched, heat shrinkable film comprising a terpolymer of
monomers (a), (b) and (c), wherein
monomer (a) comprises ethylene,
monomer (b) comprises 1-hexene, and
monomer (c) comprises 1-butene,
wherein said terpolymer has a density less than 0.915 g/cm .3
9. A film, as defined in claim 1, wherein said 1-hexene component of the terpolymer is
present in a weight ratio of about 3:1 to 1:1 of 1-hexene relative to monomer (c).
11. A film, as defined in claim 1, wherein said terpolymer has a melt index of about
0.25 g/10 min.
15. A film, as defined in claim 1, wherein said terpolymer has a melt flow ratio of at
least 65.
4Specification, page 12, lines 28-29.
5Specification, paragraph bridging pages 10-11 and page 43, first paragraph.
3
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