STRETCHING/BLOWING CONDITIONS IN ONE-STAGE INJECTION-STRETCH-BLOW-MOULDING
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United States of America Patent
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Issued Date -
Jan 21, 2010
app pub date -
Jun 20, 2007
filing date -
Jun 21, 2006
priority date (Note) -
Abandoned
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Abstract
The present invention discloses a method for preparing containers by one-stage injection-stretch-blow-moulding with a resin comprising:a random copolymer of propylene (RCP) having a melt index of from 1.5 to 35 dg/min, an ethylene content of less than 6 wt % with respect to the weight of the RCP; andoptionally a nucleating and/or a clarifying agent; wherein the preform injection temperature is larger than 200° C. and wherein the stretching and blowing temperature Tsb is limited to a very narrow range ΔT of at most 15° C., said range being a function of the injection temperature Tinj.
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