Coextruded multilayer films for sterilizable fluid containers
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United States of America Patent
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Mar 4, 2003
Issued Date -
N/A
app pub date -
Oct 23, 1998
filing date -
Feb 24, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A multilayered film exhibiting good transparency, welding resistance, puncture resistance and impact strength having an outer layer selected from the group consisting of: (1) homopolymers of polypropylene, (2) ethylene/propylene copolymers and (3) blends of (a) high density polyethylene and (b) propylene and ethylene block copolymers; an inner layer of a different composition from the outer layer and selected from the group consisting of ethylene and .alpha.-olefin copolymers, and ethylene and .alpha.-olefin copolymers blended with low density polyethylene; and a complex intermediate layer joining the outer layer to the inner layer, the complex intermediate layer having a plurality of sublayers defining an upper nucleus B1, a core B2 and a lower nucleus B3, the upper nucleus being a propylene and ethylene copolymer and the lower nucleus being an ethylene copolymer with an ethylene content greater than the upper nucleus.
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