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).

Abstract: The invention includes a process for facilitating the handling of tacky polymers (specifically amorphous polypropylene and amorphous ethylene propylene copolymers) during their polymerization comprising:a. preparing a mixture of a tacky polymeric material and a carrying phase for said polymeric material at a temperature and pressure sufficient to maintain said carrying phase as a liquid;b. flashing said mixture to a flash pressure low enough to effect vaporization of said carrying phase, as well as autorefrigeration of said polymeric material to its non-tacky, easy-handling temperature range; andc. separating the thus autorefrigerated polymeric product from its carrying phase wherein said carrying phase will dissolve sufficient polymer to form a liquid mixture.The invention also includes an apparatus for carrying out this process.