Stock material or miscellaneous articles – Composite – Of addition polymer from unsaturated monomers
Reexamination Certificate
2006-02-28
2009-12-29
Ahmed, Sheeba (Department: 1794)
Stock material or miscellaneous articles
Composite
Of addition polymer from unsaturated monomers
Reexamination Certificate
active
07638204
ABSTRACT:
A new and improved tier sheet comprises a three-layer laminated extrusion comprising outer layers of a suitable polypropylene homopolymer, and an inner core layer comprising a suitable polypropylene copolymer blended with a suitable elastomer selected from the group comprising SANTOPRENE®, KRATON®; ethyl vinyl acetate (EVA), and a thermoplastic olefin (TPO). By effectively incorporating the elastomer into the inner core layer of the three-layer laminated extrusion, the tier sheet is provided with the requisite amount of softness, elasticity, and resiliency so as to not only permit the multiplicity of cans to, in effect, form sufficiently deep impressions or depressions within the upper and lower tier sheets as the different tiers or layers of tier sheets and cans are disposed upon the transportation pallet within the tiered array comprising the palletized load such that movement of the individual cans with respect to the upper and lower tier sheets will effectively be restricted and prevented but, in addition, the tier sheet can dimensionally recover whereby the depressions and impressions will effectively disappear so as to thereby enable each tier sheet to be readied for use with respect to supporting and restraining new or additional sets of cans in connection with the formation of subsequent palletized loads. Furthermore, the outer layers will not readily delaminate from the inner core layer, and still further, the extrusion process results in the fact that the edge portions of the three-layer laminate are effectively sealed such that the three-layer tier sheet laminate will not readily absorb moisture.
REFERENCES:
patent: 5616420 (1997-04-01), Yamaoka et al.
LoPresti Philip B.
McGarel Owen J.
Ross Robert A.
Schoenberg Ronald R.
Ahmed Sheeba
Illinois Tool Works Inc.
Law Offices of Steven W. Weinrieb
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