Coated barrier film and packaging utilizing the same and method

Details Coated barrier film and packaging utilizing the same and method Coated barrier film and packaging utilizing the same and method

1996-09-26

1999-03-23

Harrison, Robert

Stock material or miscellaneous articles

Hollow or container type article

Nonself-supporting tubular film or bag

428408, 4284111, B32B 100

Patent

active

058856722

ABSTRACT:
A package or wrapping comprised of a material in the form of a liquid or a solid which is sensitive to water and oxygen. A coated barrier film is sealed about the material and forms a sealed enclosure about the material and serves to protect the material from water vapor and oxygen. The coated barrier film has low oxygen and water permeability and comprises a flexible substantially transparent plastic substrate with first and second surfaces and a thickness ranging from 1 to 7 mils. A substantially colorless barrier coating is formed on at least one of the surfaces and consists solely of graphite free of hydrogen and has a thickness ranging from 50.ANG. to 300.ANG.. The barrier film has a reduced water transmission rate and a reduced oxygen transmission rate with respect to the uncoated substrate and has a visible transparency of 30% or greater.

REFERENCES:
patent: 4421622 (1983-12-01), Hollars
patent: 4702963 (1987-10-01), Phillips et al.
patent: 4756964 (1988-07-01), Kincaid et al.
patent: 5500302 (1996-03-01), Phillips et al.
patent: 5641719 (1997-06-01), Coombs et al.
patent: 5670240 (1997-09-01), Davis
patent: 5691063 (1997-11-01), Davis et al.
Alterovitz, et al., "Variable Angle Spectroscopic Ellipsometry", Solid State Technology, Mar. 1988 (pp. 99-102).

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