Pressure-activated innerseals and containers using same
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United States of America Patent
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Jun 19, 1990
Grant Date -
N/A
app pub date -
Feb 1, 1989
filing date -
Feb 1, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Closure liner, i.e., innerseal, comprising a pressure-activated adhesive that is a copolymer of butadiene and acrylonitrile or methacrylonitrile. The copolymer has a single glass transition temperature of no higher than about -25.degree. C., a nitrile content of no greater than about 31% by weight, preferably of from about 18% by weight to about 30% by weight, a Mooney viscosity of at least 95 (measured according to ASTM D1646-87 at 100.degree. C. for 4 minutes), preferably from about 120 to about 150. The copolymer is not cross-linked, and the amount of vinyl groups in the copolymer should not exceed 10% by weight.
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