Lidstock material having improved burst strength

Details Lidstock material having improved burst strength Lidstock material having improved burst strength

2008-07-29

2008-07-29

Miggins, Michael C (Department: 1794)

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

C428S035800, C428S344000, C428S347000, C428S500000, C428S461000, C206S469000, C206S531000, C206S462000, C206S463000, C206S471000

Reexamination Certificate

active

07404994

ABSTRACT:
A lidstock material suitable for sealing plastic containers that are retorted at elevated temperatures to sterilize their contents. The lidstock material comprises a substrate joined to a film comprising a mixture of a butene-1 polymer; high density polyethylene; polypropylene; and a powdered filler. The lidstock material is heat sealable, peelable, and retains high burst strength both during and after retorting at elevated temperatures.

REFERENCES:
patent: 4810541 (1989-03-01), Newman et al.
patent: 4876156 (1989-10-01), Hwo
patent: 4916190 (1990-04-01), Hwo
patent: 5066543 (1991-11-01), Hwo
patent: 5106917 (1992-04-01), Lee et al.
patent: 5626929 (1997-05-01), Stevenson
patent: 5958531 (1999-09-01), Stevenson
patent: 2197959 (1998-08-01), None

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