Three layer film having a core layer of low pressure, low density polyethylene
AssigneeUnion Carbide Corporation
InventorsJerome T. Horner, John Anthony, William A. Fraser
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Abstract
A flexible co-extruded three layer film comprising outer layers of high pressure, low density polyethylene and a core layer of low pressure, low density polyethylene. The film is produced by a blown film tubular extrusion process at conventional rates and temperature and yet is free of melt fracture even though the low pressure, low density polyethylene would otherwise exhibit melt fracture.
Claims8
A flexible co-extruded three-layer film comprising outer layers of high pressure, low density, polyethylene and a core layer of low pressure, low density polyethylene, said film having been produced by a conventional blown film tubular extrusion process at a throughput rate of from about 4 to about 25 pounds per hour per inch of die at a process temperature of from about 350.degree. F. to about 600.degree. F., said film being characterized as free of melt fracture and having a tensile strength in the transverse direction of at least about 4.0 pounds per inch.
Dependencies are inferred from the claim text.