Method for the production of a controlled rheological polypropylene resin
US6620892B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 20, 2002 |
| Grant date | Sep 16, 2003 |
| Priority date | — |
| Expiry date | Feb 20, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L25/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This process for the production of a controlled-rheology resin of a propylene homopolymer or copolymer or a composition that comprises a propylene homopolymer or copolymer in the absence of a functional monomer, whereby said process brings about an increase of the fluidity index of the resin by cuts of the chains, is characterized by the fact that at least one stable free radical is incorporated into said resin in the viscous state, since a solid product that has an increased fluidity index is formed. In particular, the stable free radical or radicals is or are selected from among nitroxyl radicals, comprising at least one ═N—O′ group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.