Heat-shrinkable polyolefin film
OwnerTohru Hashioka, Seizou Takabayashi +3inventors
InventorsTohru Hashioka, Seizou Takabayashi, Norimi Tabota, Naonobu Oda, Hiroshi Nagano
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Abstract
A heat-shrinkable polyolefin-base film comprising a polypropylene-base resin, a petroleum resin in total and a cyclic polyolefin having a glass transition temperature not lower than 90° C. and lower than 140° C., and a multilayer heat-shrinkable film comprising a base layer which comprises a polypropylene-base resin, a petroleum resin in total and a cyclic polyolefin, and at least one outer layer which comprises a styrene resin and a polyolefin resin.
Claims12
A heat-shrinkable polyolefin-base film comprising 99 to 75 parts by weight of (A) a polypropylene-base resin and (B) a petroleum resin in total, and 1 to 25 parts by weight of (C) a cyclic polyolefin having a glass transition temperature not lower than 90° C. and lower than 140° C.
A multilayer heat-shrinkable polyolefin-base film comprising (I) a base layer which comprises a polypropylene-base resin, a petroleum resin and a cyclic polyolefin resin, and (II) at least one outer layer which comprises a styrene resin and a polyolefin resin and is formed on at least one surface of the base layer, wherein the film has a percentage of thermal shrinkage of at least 50% at 95° C.×10 seconds in the primary stretching direction of the film, a yield stress of at least 26 MPa in a direction perpendicular to the primary shrinking direction, and an adhesion strength of at least 3.0 N/15 mm when the outer layer (ii) is adhered to the base layer (I) with tetrahydrofuran.
Dependencies are inferred from the claim text.