The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 05, 2005
Filed:
Sep. 28, 1998
Päivi Huovinen, Ferrara, IT;
Ali Harlin, Vantaa, FI;
Pirjo Jääskeläinen, Porvoo, FI;
Amir Karbasi, Espoo, FI;
Nina Manner, Vantaa, FI;
Päivi Huovinen, Ferrara, IT;
Ali Harlin, Vantaa, FI;
Pirjo Jääskeläinen, Porvoo, FI;
Amir Karbasi, Espoo, FI;
Nina Manner, Vantaa, FI;
Borealis A/S, Lyngby, DK;
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 MFRof less than 0.1 g/l0 min and a low or medium molar mass polymerization product having a MFRof more than 0.5 g/10 min.