Abstract: Heat shrinkable co-extruded multilayer polyolefin film having an improved heat seal resistance, comprising:A) A central layer consisting of a blend obtained by an homogeneous dispersion of an ethylene-propylene-butene terpolymer (EPB) produced by catalysis, in a linear ethylene-alpha olefin C.sub.4, C.sub.5, C.sub.6 or C.sub.8 copolymer, said blend being optionally added with a linear ethylene-alpha olefin C.sub.4, C.sub.5, C.sub.6 or C.sub.8 copolymer,B) At least two layers externally placed with respect to said central layer and constituted by an ethylene-propylene-butene terpolymer (EPB) produced by catalysis, mixed with an ethylene-propylene copolymer (EPC).
Type:
Grant
Filed:
November 15, 1996
Date of Patent:
March 30, 1999
Assignee:
Soten S.R.L.
Inventors:
Guido Landoni, Gianpietro Landoni, Marco Zanella, Maurizio Walter Miehe
Abstract: Three-layer heat shrinkable co-extruded film, the intermediate layer consisting of linear low density polyethylene or linear medium density polyethylene, added with hydrogenated hydrocarbon resins or other resins or low molecular weight polyethylene or polypropylene waxes, and the two external layers consisting of polypropylene or ethylene-propylene copolymer added with resins or waxes of the same group as used for the intermediate layer.