Optimisation of preform preparation in injection-stretch-blow-moulding
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United States of America Patent
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Dec 13, 2011
Grant Date -
May 21, 2009
app pub date -
Sep 15, 2006
filing date -
Sep 22, 2005
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Abstract
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 MI2 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.
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