Bottles prepared from compositions of polypropylene and inorganic nucleating agents

A process for preparing bottles with a two-machine system comprising the steps of:

• a. providing a composition comprising polypropylene, prepared with a Ziegler-Natta catalyst system and a non-sorbitol nucleating or clarifying agent comprising aluminum hydroxybis{2,2′-methylenebis[4,6-di(tert-butyl)phenyl]phosphate};
• b. preparing a pre-form by injection moulding on a multi-cavity mould at injection temperature of 215° C.;
• c. cooling the pre-form at room temperature;
• d. transporting the pre-form to the blow-moulding machine;
• e. re-heating the pre-form in the blow-moulding machine to a temperature of from 90 to 140° C., following a pre-determined temperature profile;
• f. passing the re-heated pre-form through an equilibrium zone;
• g. stretching the pre-form axially with a centre rod having a speed of 1400 to 1800 mm/s;
• h. blowing the stretched pre-form radially with high-pressure air;
• i. retrieving bottles having low haze values.