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US 8,557,372 B2Granted
Laminate for preserving food
AssigneeNorthern Technologies International Corporation
InventorsDonald Kubik, Barbara Nygaard
Life of this patent
Estimating the term…
Abstract
An all-purpose plastic laminate or wrap as for preserving food that resists penetration of fluids such as water and gases such as oxygen, hydrogen sulfide, sulfur dioxide, and the like. The laminate includes many different embodiments such as at least one hydrophobic outer layer that is free of any volatile corrosion inhibitors, at least one gas resistant barrier layer that can be a hydrophilic polymer, and at least one hydrophobic inner layer that contains a desired additive such as a food safe preservative or antioxidant therein. Optionally at least one tie layer is located between the outer and/or inner layer and said fluid resistant barrier layer. The laminate when applied as a wrap to a food item provides synergistic protection against fluid penetration.
Claims20
A food wrap laminate, comprising:
- at least one thermoplastic outer layer and at least one hydrophobic moisture and gas resistant thermoplastic inner layer;
- at least one barrier layer;
- a tie layer composition that is compatible with said hydrophobic polymer inner layer and said barrier layer, said tie layer composition comprising a polyacrylate or a polymethacrylate wherein the ester portion thereof has from 1 to about 12 carbon atoms, or a blend of said polyacrylate or said polymethacrylate with a polyolefin;
- a polyanhydride or a polymaleic anhydride, or a copolymer of said polyanhydride or said polymaleic anhydride with an olefin, with ethyl vinyl acetate, or with ethylene acrylate;
- wherein at least one of said inner layers contains a food preservative, and wherein said food preservative comprises ascorbyl palmitate, calcium ascorbate, EDTA, calcium sorbate, caprylic acid, dehydroacetic acid or its sodium salt, disodium thylenebisdithiocarbamate, erythorbic acid, formaldehyde, methylparaben, sodium nitrate, potassium nitrate, n-octanoic acid, octyl gallate, potassium metabisulfite, potassium sorbate, propionic acid, propylparaben, quaternary ammonium chloride combination, silver nitrate, silver metal particles, silver nano particles, ionic silver compounds, sodium ascorbate, sodium benzoate, sodium bisulfite, sodium dimethyldithiocarbamate, sodium metabisulfite, sodium nitrite, potassium nitrite, sodium phosphate, sodium propionate, sodium sorbate, stannous chloride, stearyl citrate, sulfating agents, sulfur dioxide, or a tocopherol;
- or any combination thereof;
- and
- wherein said laminate has an oxygen transmission rate of less than about 1.0 cc/100 in2/day.
5 more elements
A food wrap laminate, comprising:
- at least one outer hydrophobic thermoplastic polymer layer;
- at least one barrier layer;
- at least one first tie layer that is compatible with said outer layer and said barrier layer and is located between said outer polymer layer and said barrier layer;
- at least one thermoplastic inner hydrophobic moisture and gas resistant polymer layer,
- at least one second tie layer that is compatible with said barrier layer and said inner layer and is located between said barrier layer and said inner layer;
- wherein said first and or second tie layer, independently, comprise a polyacrylate or a polymethacrylate wherein the ester portion thereof has from 1 to about 12 carbon atoms, or a blend of said polyacrylate or said polymethacrylate with a polyolefin;
- a polyanhydride or a polymaleic anhydride, or a copolymer of said polyanhydride or said polymaleic anhydride with an olefin, with ethyl-vinylacetate, or with ethylene acrylate;
- wherein at least one of said thermoplastic inner layers contains a food preservative, and wherein said food preservative comprises ascorbyl palmitate, calcium ascorbate, EDTA, calcium sorbate, caprylic acid, dehydroacetic acid or its sodium salt, disodium ethylenebisdithiocarbamate, erythorbic acid, formaldehyde, methylparaben, sodium nitrate, potassium nitrate, n-octanoic acid, octyl gallate, potassium metabisulfite, potassium sorbate, propionic acid, propylparaben, quaternary ammonium chloride combination, silver nitrate, silver metal particles, silver nanoparticles, ionic silver compounds, sodium ascorbate, sodium benzoate, sodium bisulfite, sodium dimethyldithiocarbamate, sodium metabisulfite, sodium nitrite, potassium nitrite, sodium phosphate, sodium propionate, sodium sorbate, stannous chloride, stearyl citrate, sulfating agents, sulfur dioxide, or a tocopherol;
- or any combination thereof;
- and
- wherein said laminate has an oxygen transmission rate of less than about 1.0 cc/100 in2/day.
8 more elements
A food wrap laminate, comprising;
- at least one harrier layer;
- a food preservative;
- at least one hydrophobic moisture and gas resistant thermoplastic inner polymer layer comprising a mixture of said food preservative and at least one tie compound that is compatible with said inner layer polymer and said barrier layer, wherein said inner layer tie compound comprises a polyacrylate or a polymethacrylate wherein the ester portion thereof has from 1 to about 12 carbon atoms, or a blend of said polyacrylate or said polymethacrylate with a polyolefin;
- a polyanhydride or a polymaleic anhydride, or a copolymer of said polyanhydride or said polymaleic anhydride with an olefin, with ethylvinylacetate, or with ethylene acrylate, and
- wherein said food preservative comprises ascorbyl palmitate, calcium ascorbate, EDTA, calcium sorbate, caprylic acid, dehydroacetic acid or its sodium salt, disodium ethylenebisdithiocarbamate, erythorbic acid, formaldehyde, methylparaben, sodium nitrate, potassium nitrate, n-octanoic acid, octyl gallate, potassium metabisulfite, potassium sorbate, propionic acid, propylparaben, quaternary ammonium chloride combination, silver nitrate, silver metal particles, silver nano particles, ionic silver compounds, sodium ascorbate, sodium benzoate, sodium bisulfite, sodium dimethyldithiocarbamate, sodium metabisulfite, sodium nitrite, potassium nitrite, sodium phosphate, sodium propionate, sodium sorbate, stannous chloride, stearyl citrate, sulfating agents, sulfur dioxide, or a tocopherol, or any combination thereof;
- and
- wherein said laminate has an oxygen transmission rate of less than about 1.0 cc/100 in2/day.
4 more elements
Dependencies are inferred from the claim text.