Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Reexamination Certificate
2000-05-19
2003-01-28
Bell, Mark L. (Department: 1755)
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
C428S040100, C428S041300, C428S041700, C428S041800, C428S202000, C428S203000, C428S205000, C428S336000, C428S517000
Reexamination Certificate
active
06511723
ABSTRACT:
SUMMARY OF THE INVENTION
None of the above documents teaches nor suggests the invention.
Thus, the invention provides a multilayer structure (C), comprising an extrudable central pressure-sensitive adhesive layer (
3
), where the central adhesive layer comprises two extrudable pressure-sensitive adhesive sub-layers, and two extrudable outer layers (
2
) and (
4
), at least one of which is able to function as a tearable welding layer (
4
), the structure (C) being formed by collapsing a co-extrusion bubble.
According to one embodiment, collapsing the co-extrusion bubble is done in an oxidizing medium.
According to another embodiment, the extrudable central pressure-sensitive adhesive layer (
3
) comprises a thermoplastic elastomer-based hot melt adhesive.
According to one embodiment, each of the extrudable outer layers (
2
) and (
4
) comprises a polyethylene.
According to another embodiment, the outer layers comprise metallocene PE.
The invention also provides a process for preparing a structure according to the invention, by collapsing the co-extrusion bubble on itself.
Collapsing is preferably done in an oxidizing medium.
The invention also provides a multilayer package comprising an extrudable inner layer interposed on one outermost side of the central pressure-sensitive layer, where the inner layer is able to function as a tearable welding layer, and where at least a portion of the package is formed by welding the inner layer to itself.
The invention also provides a process for preparing a packaging according to the invention.
The invention will now be described in more detail below, with reference to the attached drawings.
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patent: 4956228 (1990-09-01), Clerici et al.
patent: 5089320 (1992-02-01), Straus et al.
patent: 5382472 (1995-01-01), Yanidas et al.
patent: 5389438 (1995-02-01), Miller et al.
patent: 5882749 (1999-03-01), Jones et al.
patent: 720465 (1997-06-01), None
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patent: 0 661 154 b1 (1995-07-01), None
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patent: WO 90/07427 (1990-07-01), None
Bell Mark L.
Manlove Shalie
Pennie & Edmonds LLP
Soplaril S.A.
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