Lidstock material having improved burst strength
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United States of America Patent
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Jul 29, 2008
Grant Date -
Sep 16, 2004
app pub date -
Mar 12, 2003
filing date -
Mar 12, 2003
priority date (Note) -
Expired
status (Latency Note)
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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.
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