Patent ID: 8444908

Claim:
An injection-stretch blow molding process for the manufacture of an impact-resistant container with good optical properties comprising the step of (a) providing a polyolefin composition comprising a polypropylene and a polyethylene, said polypropylene being a homopolymer or a random copolymer of propylene and a comonomer selected from the group consisting of ethylene and C 4 -C 10 alpha-olefins, and said polyethylene having been produced using a metallocene catalyst, wherein said metallocene polyethylene has a melt index in the range from 5 to 30 dg/min and a density of at least 0.925 g/cm 3 , (b) preparing a preform from said polyolefin composition by injection molding at an injection temperature of at least 230° C., (c) optionally cooling the preform to room temperature, (d) optionally re-heating the preform to a temperature in the range from 90° C. to 140° C., (e) stretching the preform axially by a center rod, and (f) blowing the preform radially with a gas under pressure.