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:
Jun. 26, 2012
Filed:
Nov. 26, 2008
Peter Denifl, Helsinki, FI;
Timo Leinonen, Tolkkinen, FI;
Anssi Haikarainen, Tuusula, FI;
Torvald Vestberg, Porvoo, FI;
Peter Denifl, Helsinki, FI;
Timo Leinonen, Tolkkinen, FI;
Anssi Haikarainen, Tuusula, FI;
Torvald Vestberg, Porvoo, FI;
Borealis Technology Oy, Porvoo, FI;
Abstract
The invention is directed to a process for the manufacture of heterophasic propylene copolymer compositions comprising the steps of forming a propylene polymer matrix in at least one slurry reactor and optionally in at least one gas phase reactor and subsequently forming in at least one gas phase reactor an elastomeric copolymer by copolymerizing propylene with ethylene and/or with another alpha-olefin in the presence of said matrix, wherein the polymerization is carried out in the presence of a catalyst system comprising a catalyst in form of solid particles, said particles (a) have a surface area of less than 20 m/g, (b) comprise a transition metal compound of groups 4 to 10 of the periodic table or a compound of actinide or lanthanide, (c) comprise a metal compound of groups 1 to 3 of the periodic table, and (d) comprise inclusions not comprising catalytically active sites.