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. 03, 2007
Filed:
Jun. 17, 2003
Daniele Bigiavi, Bologna, IT;
Nicolò Arich DE Finetti, Ferrara, IT;
Gabriele Mei, Ferrara, IT;
Guiseppe Penzo, Mantova, IT;
Massimo Covezzi, Ferrara, IT;
Pietro Baita, S. Maria Maddalena-Rovigo, IT;
Maria Silvia Tonti, Ferrara, IT;
Daniele Bigiavi, Bologna, IT;
Nicolò Arich De Finetti, Ferrara, IT;
Gabriele Mei, Ferrara, IT;
Guiseppe Penzo, Mantova, IT;
Massimo Covezzi, Ferrara, IT;
Pietro Baita, S. Maria Maddalena-Rovigo, IT;
Maria Silvia Tonti, Ferrara, IT;
Basell Poliolefine Italia S.p.A., Milan, IT;
Abstract
Method for continuously removing the unreacted butene-1, and optionally other volatile components, from a polymeric solution obtained by liquid phase (co)polymerization of butene-1, the method comprising the steps of: subjecting the polymeric solution to heating and mixing conditions such that a mixture is formed consisting substantially of: (1) a polybutene melt containing entrapped butene-1 and (2) supercritical gaseous butene-1; subjecting the above mixture to a sequence of devolatilization steps operating at decreasing pressures.