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:
Jan. 09, 2007
Filed:
Jun. 17, 2003
Daniele Bigiavi, Bologna, IT;
Gabriele Mei, Ferrara, IT;
Nicolo' Arich DE Finetti, Ferrara, IT;
Giuseppe Penzo, Mantova, IT;
Gianni Vitale, Ferrara, IT;
Massimo Covezzi, Ferrara, IT;
Daniele Bigiavi, Bologna, IT;
Gabriele Mei, Ferrara, IT;
Nicolo' Arich De Finetti, Ferrara, IT;
Giuseppe Penzo, Mantova, IT;
Gianni Vitale, Ferrara, IT;
Massimo Covezzi, Ferrara, IT;
Basell Poliolefine Italia S.p.A., Milan, IT;
Abstract
A liquid-phase process for polymerizing α-olefins of the formula CH═CHR, where R is H or an alkyl radical C1–C6, to produce a polymer that is soluble in the reaction medium, comprising the steps of: a) continuously polymerizing in liquid phase the α-olefin in the presence of a catalyst system based on a transition metal compound; b) continuously withdrawing from step a) a solution of polymer in the liquid reaction medium; c) mixing in one or more mixing stages said solution of polymer in the reaction medium with an organic deactivator having: at least a hydroxy group, a boiling point higher than 150° C., and a ratio between the molecular weight (MW) and the number of hydroxy groups (OH) comprised between 20 and 100.