Method of producing inflation film and said film
AssigneeSumitomo Chemical Company, Limited
InventorsYasuro Suzuki, Yuki Iseki
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Abstract
A method of producing an inflation film, which comprises processing an ethylene polymer or a resin composition containing said ethylene polymer in a die gap at a melting temperature of not more than 170° C., wherein said ethylene polymer is produced by an ionic polymerization method and said ethylene polymer has a density of 0.89 to 0.96 g/cm3, a melting viscosity η*[170] at 170° C. under a shear rate of 100 rad/sec of 0.001×104 to 3.5×104 poise and a weight proportion a (% by weight) of a cold xylene-soluble portion satisfying the following formula (1): a<4.8×104×(0.95−d)3+106×(0.95−d)4+0.5 formula (1) (wherein a is a weight proportion (% by weight) of a cold xylene-soluble portion of the ethylene polymer and d is a density (g/cm3) of an ethylene polymer).
Claims6
A method of producing an inflation film, which comprises processing a polymer consisting essentially of ethylene or a resin composition consisting essentially of said ethylene polymer and high-pressure low-density polyethylene in a die gap at a melting temperature of not more than 170° C., wherein said ethylene polymer is produced by an ionic polymerization method and said ethylene polymer has a density of 0.89 to 0.96 g/cm3, a melting viscosity η*(170) at 170° C. under a shear rate of 100 rad/sec of 0.001×104 to 3.5×104 poise and a weight proportion a (% by weight) of a cold xylene-soluble portion satisfing the following formula (1):
- a<4.8×104×(0.95−d)3+106×(0.95−d)4+0.5 formula (1)
- wherein a is a weight proportion (% by weight) of a cold xylene-soluble portion of the ethylene polymer and d is a density (g/cm3) of an ethylene polymer.
Dependencies are inferred from the claim text.