Multilayer film comprising propylene-ethylene-1-butene terpolymers

A multilayer film comprising:

• (i) a skin layer comprising
• (a) a polyolefin composition comprising:
• A) from about 19 wt % to about 50 wt %, based upon the total weight of the polyolefin composition, of a propylene ethylene copolymer having an ethylene derived units content ranging from about 1.5 wt % to about 6.0 wt %, based upon the total weight of the propylene ethylene copolymer and
• B) from about 50 wt % to about 81 wt %, based upon the total weight of the polyolefin composition, of a propylene ethylene 1-butene terpolymer having an ethylene derived units content ranging from about 1.5 wt % to about 6.0 wt %, based upon the total weight of the propylene ethylene 1-butene terpolymer, and 1-butene derived units content of between about 4.8 wt % and about 12.4 wt %, based upon the total weight of the propylene ethylene 1-butene terpolymer;
• the sum of the amount of component A) and B) being 100;
• the composition being characterized by the following features:
• molecular weight distribution (MWD), expressed in terms of Mw/Mn, greater than about 4.0;
• a xylene soluble fraction content at 0/25° C. is between 1.2 and 15.1 wt. %, based on the total weight of the polyolefin composition;
• and
• the creep and recovery curve measured on the polymer fuse at 200° C. measured shows a maximum value between 600 and 1200 seconds, lower than about 53×10−41/Pa;
• wherein the polyolefin composition is made in the presence of a catalyst made from or containing the product of the reaction between:
• (i) a solid catalyst component made from or containing Ti, Mg, Cl and an electron donor compound, containing 0.1 to 50 wt. % of Bi, based upon the total weight of the solid catalyst component;
• (ii) an alkylaluminum compound, and
• (iii) an external electron-donor compound.