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:
Jul. 14, 2015
Filed:
Oct. 06, 2009
Michiel Bergstra, Berchem, BE;
John Severn, Eindhoven, NL;
Torvald Vestberg, Porvoo, FI;
Pauli Leskinen, Helsinki, FI;
BO Malm, Espoo, FI;
Olli Tuominen, Helsinki, FI;
Pirjo Jääskeläinen, Porvoo, FI;
Michiel Bergstra, Berchem, BE;
John Severn, Eindhoven, NL;
Torvald Vestberg, Porvoo, FI;
Pauli Leskinen, Helsinki, FI;
Bo Malm, Espoo, FI;
Olli Tuominen, Helsinki, FI;
Pirjo Jääskeläinen, Porvoo, FI;
Borealis AG, Vienna, AT;
Abstract
The present invention relates to a process for the preparation of a propylene copolymer P1 having ethylene-derived comonomer units, which comprises the following steps: (i) introducing propylene, ethylene, and hydrogen into a polymerisation reactor R1, wherein the ethylene is fed to the polymerisation reactor R1 in a periodically varying amount, (ii) preparing the propylene copolymer in the polymerisation reactor R1 in the presence of a catalyst.