Appeal No. 1996-0328
Application 08/060,891
3 8 9
and <0.915 g/cm and mole ratios of hexene-1 to butene-1 of 2.7 and 0.1. Steinert teaches the
terpolymer is useful as food film wrap because of its good optical properties, improved haze and low
hexane extractible concentration. Steinert does not describe the melt flow ratio of the terpolymers.10
b. The Lustig patent
Lustig describes biaxially stretched, heat-shrinkable films made of VLDPE. The VLDPE is made11
of ethylene and “at least one” higher alpha olefin. The described higher alpha olefins include butene-1,12
hexene-1, 4-methylpentene-1, and octene-1. The VLDPE polymers are described as having a density13
3 3 14
from about 0.86 g/cm to 0.91 g/cm . The described VLDPE polymers have a melt flow ratio from about
22 to about 40. The biaxially stretched VLDPE films heat-shrink from about 30 to 50 percent at a15
o 16
temperature of 90 C in both the machine and transverse direction. Lustig teaches that VLDPE stretched
films have excellent tensile, elongation and puncture toughness properties. Due to these properties, the17
VLDPE films are suitable for packaging food articles. 18
8Steinert, page 4, table 1 and page 5, table 3.
9We understand the symbol “<” to mean “less than.”
10Steinert, page 3, lines 54-59.
11Lustig, column 2, lines 10-13.
12Lustig, column 2, lines 13-16 and 36-37.
13Lustig, column 3, lines 15-16.
14Lustig, column 2, lines 17-20.
15Lustig, paragraph bridging columns 8-9.
16Lustig, column 10, lines 18-21.
17Lustig, column 10, lines 22-25.
18Lustig, column 1, lines 10-15 and column 2, lines 10-15.
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