METHOD OF INJECTION-STRETCH-BLOW-MOULDING

摘要

This invention discloses a method for preparing a preform for two-stage injection-stretch-blow-moulding (ISBM) from polypropylene resin produced with a Ziegler-Natta catalyst system and having a melt flow index M12 of from 1 to 20 dg/min, wherein polypropylene is injected at a melt temperature of at least 265 °C. Also disclosed are the preforms obtainable by the method, the use of the preforms for preparing bottles, and the bottles prepared from the preforms.