Production of polypropylene having improved properties
US7169827B2 · kind B2 · utility
10Cited by
20References
9Claims
0Family size
Assignee
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Key dates
| Filing date | Jun 27, 2001 |
| Grant date | Jan 30, 2007 |
| Priority date | — |
| Expiry date | Jul 12, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2323/10
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for producing polypropylene having increased melt strength, the process comprising irradiating polypropylene which has been polymerised using a Ziegler-Natta catalyst with an electron beam having an energy of at least 5 MeV and a radiation dose of at least 10 kGray and mechanically processing the irradiated polypropylene to form long chain branches on the polypropylene molecules, whereby the polypropylene has a melt flow index (MFI) of at least 25 dg/min.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.