Thin walled polyethylene container
AssigneeNOVA Chemicals (International) S.A.
InventorsMark Weber, Philippa Hocking, Allan Duff, James Arthur Auger
Life of this patent
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Abstract
Thin walled polyethylene containers are suitable for the packaging of foods such as cottage cheese, ricotta cheese and ice cream. The containers have a higher softening point (which permits the containers to be “hot filled”) and high impact strength at low temperature (which is useful when a container of ice cream is dropped).
Claims3
A container having a nominal volume of from 100 mL to 12 L prepared by injection molding of ethylene copolymer resin, said container having a Vicat softening point of greater than 121° C. and an average test drop height point of greater than 2.5 feet as determined by ASTM D5276 wherein said ethylene copolymer resin is characterized by:
- i) a density from 0.950 g/cc to 0.955 g/cc;
- ii) a viscosity at 100,000 sec−1 shear rate and 280° C. of less than 3.5 Pascal seconds;
- iii) a molecular weight distribution, Mw/Mn of from 2.2 to 2.8;
- and
- iv) a hexane extractables content of less than 0.5 weight %.
Dependencies are inferred from the claim text.