COVER MATERIAL
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United States of America Patent
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Issued Date -
Aug 13, 2015
app pub date -
Sep 27, 2012
filing date -
Sep 25, 2012
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Abstract
A cover material used for a container has a seal part covered with a polyethylene resin. The cover material includes a base material and a sealant layer. The sealant layer has a laminated structure obtained through lamination of a first thermoplastic resin layer, adhesive to the base material, and a second thermoplastic resin layer, adhesive to the seal part covered with the polyethylene resin. Thicknesses of the first thermoplastic resin layer and the second thermoplastic resin layer satisfy: thickness of first thermoplastic resin layer≦thickness of second thermoplastic resin layer. The layer of the second thermoplastic resin has a dispersion structure obtained by dispersing, in the first thermoplastic resin, the second thermoplastic resin that is non- compatible or partially compatible to the first thermoplastic resin such that a ratio Us of a domain longer diameter 1 and a domain shorter diameter s of the second thermoplastic resin is within 1.5≦l/s≦10.
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