Patent · US Expired

Production of polyolefins having improved properties

US7019044B2 · kind B2 · utility

5Cited by

12References

16Claims

0Family size

Assignee

Total Petrochemicals Research Feluy · BE

Inventors

Guy Debras · Les Bons Villers, BE
Marc Dupire · Hyon, BE
Jacques Michel · Limeil-Brévannes, FR

Key dates

Filing date	Jun 27, 2001
Grant date	Mar 28, 2006
Priority date	—
Expiry date	Oct 7, 2021

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J2323/10
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A process for producing polypropylene having increased melt strength, the process comprising (i) homopolymerising polypropylene or copolymerising propylene with one or more comonomers selected from ethylene and C4 to C101-olefins to produce a polypropylene homopolymer or copolymer respectively having a double bond concentration of at least 0.1 per 10,000 carbon atoms, (11) irradiating the polypropylene with an electron beam having an energy of at least 5 MeV and at radiation dose of at least 5 kGray, and (iii) melting and mechanically processing the melt of polypropylene to form long chain branches on the polypropylene molecules.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.