Multilayered packaging materials having high gas barrier propert

Details Multilayered packaging materials having high gas barrier propert Multilayered packaging materials having high gas barrier propert

1990-12-21

1991-12-03

Buffalow, Edith L.

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

428412, 4284763, 428516, 426127, B29D 2200

Patent

active

050699466

ABSTRACT:
This invention provides a gas-barrier multilayered packaging material which comprises an outer layer of a composition comprising 55-97 wt % of an EVCOH and 45-3 wt % of a resin selected from the group consisting of polyamide, polyolefin, polyester and polycarbonate and an inner layer comprising a hydrophobic thermoplastic resin having a low moisture permeability; and further provides a gas-barrier multilayered packaging material which comprises an outer layer comprising a resin layer having a moisture permeability (measured at 40.degree. C., 90% RH) of at least 40 g/m.sup.2 day, an intermediate layer of a composition comprising 55 to 97% by weight of an EVOH and 45 to 3% by weight of a resin selected from the group consisting of polyamide, polyolefin, polyester and polycarbonate and an inner layer comprising a hydrophobic thermoplastic resin layer having a moisture permeability lower than that of the outer layer. Both of them are useful as packaging materials to be used for boil sterilization or retort sterilization.

REFERENCES:
patent: 4828915 (1989-05-01), Schroeder et al.

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