Multilayer food wrap with cling
AssigneeUnion Carbide Corporation
InventorsEdward N. Biel, George F. Kirkpatrick
Life of this patent
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Abstract
A multilayer film food wrap having outer layers of a polyolefin resin including a cling agent, and a core layer of a resin having a high melting point, resistance to heat, low permeability to oxygen, moisture and odor, and film toughness. Methods of preparing the film and fabricating the film into a bag are also disclosed.
Claims32
A multilayer film suitable for use in microwave oven cooking consisting essentially of outer layers of a polyolefin resin including a cling agent, each of said outer layers having a thickness of from about 0.1 mil to about 1.0 mil, said polyolefin resin being selected from the group consisting of polyethylene, polypropylene, and polybutylene, and a core layer of a thermoplastic resin having a melting point of at least about 335.degree. F., resistance to heat, low permeability to oxygen, moisture and odor, and film toughness, said thermoplastic resin being selected from the group consisting of polyamides, polybutylene terephthalate, polyethylene terephthalate, ethylene-vinyl alcohol, and mixtures thereof.
A method of preparing a multilayer film suitable for use in microwave oven cooking comprising slot cast extruding outer layers of a polyolefin resin including a cling agent, each of said outer layers having a thickness of from about 0.1 mil to about 1.0 mil, said polyolefin resin being selected from the group consisting of polyethylene, polypropylene, and polybutylene, and a core layer of a thermoplastic resin having a melting point of at least about 335.degree. F., resistance to heat, low permeability to oxygen, moisture and odor, and film toughness, said thermoplastic resin being selected from the group consisting of polyamides, polybutylene terephthalate, polyethylene terephthalate, ethylene-vinyl alcohol, and mixtures thereof.
A multilayer film suitable for use in microwave oven cooking comprising two outer layers of polypropylene containing a cling agent, and a core layer of a thermoplastic resin having a melting point of at least about 335.degree. F., resistance to heat, low permeability to oxygen, moisture and odor, and film toughness, said thermoplastic resin being selected from the group consisting of polyamides, polybutylene terephthalate, polyethylene terephthalate, ethylene-vinyl alcohol, and mixtures thereof.
A method of preparing a multilayer film suitable for use in microwave oven cooking comprising slot cast extruding two outer layers of polypropylene containing a cling agent, and a core layer of a thermoplastic resin having a melting point of at least about 335.degree. F., resistance to heat, low permeability to oxygen, moisture and odor, and film toughness, said thermoplastic resin being selected from the group consisting of polyamides, polybutylene terephthalate, polyethylene terephthalate, ethylene-vinyl alcohol, and mixtures thereof.
Dependencies are inferred from the claim text.