High melt strength polypropylene

Details High melt strength polypropylene High melt strength polypropylene

2005-04-05

2005-04-05

Rabago, Roberto (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymerizing in tubular or loop reactor

C526S065000, C526S066000, C526S067000, C526S068000, C526S351000, C526S905000, C525S053000, C525S240000

Reexamination Certificate

active

06875826

ABSTRACT:
The present invention concerns a high melt strength propylene polymer or copolymer suitable for manufacturing foams and thermoformed product exhibiting a melt strength of at least 3 g and comprising a high molar mass portion and a low or medium molar mass portion. The polymers are produced by subjecting propylene and optionally other olefins to polymerization in a plurality of polymerization reactors connected in series, employing different amounts of hydrogen as a molar mass modifier in at least two of the reactors, and carrying out the polymerization reaction in the presence of a catalyst system capable of catalyzing the formation of a high molar mass polymerization product having a MFR2of less than 0.1 g/l0 min and a low or medium molar mass polymerization product having a MFR2of more than 0.5 g/10 min.

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