Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Reexamination Certificate
2007-12-14
2009-08-11
Miggins, Michael C (Department: 1794)
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
C428S035200, C428S220000, C428S035600, C428S500000, C524S480000, C524S487000
Reexamination Certificate
active
07572494
ABSTRACT:
A method for packaging plastic material using a film to surround the material, and more particularly to a method for packaging hot melt adhesives, the resulting package formed thereby, and the film composition used therein. The method is preferably a coextrusion process for packaging a pressure sensitive hot melt adhesive by extruding a hot melt adhesive through a die orifice, and coextruding a wax-based polymeric film to surround the hot melt adhesive. The coated adhesive may then be formed into individual packaged units having a finite size and shape. The polymeric film comprises a composition having at least 25% by weight of a wax material, an enthalpy of fusion of at least about 100 J/g, and an elongation value at break of at least about 100%. Any type of hot melt adhesive formulation can be packaged or surrounded by the polymeric film in the process. Also, the specific enthalpy of fusion desired and/or elongation value at break desired for the polymeric film can be obtained by blending an appropriate amount of partially crystalline ethylene-based polymer together with a thermoplastic elastomeric block copolymer and/or an ethylene based or propylene-based elastomer.
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Chiarabini Dominique
Mehta Atul
Morel-Fourrier Chrisophe
Neperud Michael A.
Sajot Nicolas E.
Andrus Sceales Starke & Sawall LLP
Miggins Michael C
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