Appeal No. 95-2035
Serial No. 08/083,864
BACKGROUND
The appellant's invention relates to an ethylene polymer blend consisting essentially of a high
molecular weight (HMW) component and a relatively low molecular weight (LMW) component
wherein the blend and the individual components have defined properties. Claims 1, 5, 6 and 12 are
illustrative of the claimed subject matter and read as follows:
1. An ethylene polymer blend comprising a preponderance of polymerized
ethylene having a density of at least about 0.930 g/cc, a flow index or high load melt
index (I ) of at least about 2 g/10 min., a melt flow ratio (MFR) of at least about 60,
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and a polydispersity index of at least about 8, the polymers of said blend consisting
essentially of at least about 0.3 weight fraction of a relatively high molecular weight
(HMW) component having a density of at least about 0.900 g/cc, a flow index or high
load melt index (I ) of at least about 0.2 g/10 min., and a flow ratio (FR) of at least
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about 12, and a relatively low molecular weight (LMW) component having a density of
at least about 0.930 g/cc and a melt index (I ) no greater than about 1000 g/10 min.
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5. The polymer blend of claim 1 having a density of about 0.939 to 0.960 g/cc,
an I of about 5 to 50 g/10 min., a MFR of about 70 to 300, and a polydispersity
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index of about 10 to 18, and wherein said HMW component is present at a weight
fraction of about 0.4 to 0.7, and has a density of about 0.920 to 0.950 g/cc, an I of
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about 0.2 to 5 g/10 min., and a FR of about 10 to 30, and said LMW component has a
density of about 0.950 to 0.978 g/cc and an I of about 10 to 500 g/10 min.
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6. The blend of claim 5 having a density of about 0.950 to 0.960 g/cc, an I of
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about 5 to 40 g/10 min., a MFR of about 80 to 200, and a polydispersity index of
about 11 to 17, and wherein said HMW component is present at a weight fraction of
about 0.45 to 0.60, and has a density of about 0.930 to 0.945 g/cc, an I of about 0.5
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to 4 g/10 min., and a FR of about 16 to 25, and said LMW component has a density of
about 0.970 to 0.976 g/cc and an I of about 30 to 300 g/10 min.
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12. The polymer blend of claim 13 produced by a process comprising
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