Patent ID: 8821784

Claim:
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.