Increasing the gas transmission rate of a film comprising fullerenes
AssigneeCryovac, Inc.
InventorMichael D. Grah
Life of this patent
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Abstract
A method of increasing the gas transmission rate of a packaging film comprises providing a packaging film that comprises at least about 0.001 weight % of fullerene material selected from spherical fullerenes, bowl-shaped fullerenes, multi-walled carbon nanotubes, carbon nanocones, and carbon nano-onions. The packaging film is exposed to an amount of radiation energy effective to increase the oxygen transmission rate of the packaging film by at least about 100 cc (STP)/m2. day (1 atm, 0% RH, 23° C.).
Claims51
A method of increasing the gas transmission rate of a packaging film comprising the steps of:
- providing a packaging film comprising at least about 0.001 weight %, based on the weight of the film, of fullerene material selected from one or more of spherical fullerenes, bowl-shaped fullerenes, multi-walled carbon nanotubes, carbon nanocones, and carbon nano-onions;
- and
- exposing the packaging film to an amount of radiation energy effective to increase the oxygen transmission rate of the packaging film by at least about 100 cubic centimeters (at standard temperature and pressure) per square meter per day per 1 atmosphere of oxygen pressure differential measured at 0% relative humidity and 23° C.
A packaging film comprising at least one layer comprising:
- 100 weight parts of oxygen barrier polymer selected from one or more of ethylene/vinyl alcohol copolymer, polyvinyl alcohol, vinylidene chloride polymer, polyalkylene carbonate, polyester, polyacrylonitrile, and polyamide;
- and
- at least about 0.001 weight parts of fullerene material per 100 weight parts oxygen barrier polymer, wherein the fullerene material is selected from one or more of spherical fullerenes, bowl-shaped fullerenes, multi-walled carbon nanotubes, carbon nanocones, and carbon nano-onions.
A packaging film comprising:
- at least one layer;
- and
- one or more discontinuous regions supported by the at least one layer, wherein the one or more discontinuous regions comprise at least about 0.001 weight % of fullerene material based on the weight of the film.
Dependencies are inferred from the claim text.