Optimisation of preform preparation in...

Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Including application of internal fluid pressure to hollow...

Reexamination Certificate

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C264S537000

Reexamination Certificate

active

08075831

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.

REFERENCES:
patent: 4196731 (1980-04-01), Laurin et al.
patent: 4357288 (1982-11-01), Oas et al.
patent: 5849843 (1998-12-01), Laurin et al.
patent: 6599595 (2003-07-01), Chundury et al.
patent: 2005/0058741 (2005-03-01), Fujii et al.
patent: 2007/0246866 (2007-10-01), Smits
patent: 1533102 (2005-05-01), None
Flick, E.W., “Industrial Synthetic Resins Handbook,” Second Edition, William Andrew Publishing/Noyes, 1991, pp. 729-772.

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