Stock material or miscellaneous articles – Hollow or container type article – Nonself-supporting tubular film or bag
Reexamination Certificate
2005-02-22
2005-02-22
Nakarani, D. S. (Department: 1773)
Stock material or miscellaneous articles
Hollow or container type article
Nonself-supporting tubular film or bag
C156S244110, C156S244240, C156S244260, C156S273300, C156S275100, C156S308400, C264S080000, C264S173120, C264S173160, C264S469000, C264S471000, C264S473000, C264S477000, C428S035400, C428S036600, C428S036700, C428S220000, C428S516000, C428S520000
Reexamination Certificate
active
06858275
ABSTRACT:
An irradiated multilayer film has a first layer and a second layer. The first layer is an outer heat seal layer containing a blend of a highly branched homogeneous polymer and a semicrystalline polymer. The highly branched homogeneous polymer has at least 40 branches per 1000 methylene groups, an Mw/Mnless than 3.0, and a density of less than 0.89 g/cc. The highly branched homogeneous polymer is present in an amount of from about 1 to 50 weight percent, based on layer weight. The semicrystalline polyolefin has a density of at least 0.90 g/cc. The semicrystalline polyolefin is present in an amount of from about 60 to 99 weight percent, based on total layer weight. The second layer contains a thermoplastic polymer in a crosslinked polymer network. A process for making a packaging article includes coextruding the first and second layers, irradiating the resulting multilayer film, and thereafter heat sealing the first layer to itself or another component of the packaging article.
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Ferri Isabella
Miranda Nathanael Rustia
Opuszko Slawomir
Cryovac Inc.
Hurley Jr. Rupert B.
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