Propylene block copolymer and process for production thereof
US7875682B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 28, 2006 |
| Grant date | Jan 25, 2011 |
| Priority date | — |
| Expiry date | Oct 14, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2314/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed is a propylene block copolymer having excellent flexibility and impact resistance and showing a good polymer powder form. Also disclosed is a process for producing the copolymer. More specifically, the copolymer is a novel propylene block copolymer which satisfies a specific requirement and is produced by a process comprising continuously performing a multi-step polymerization composed of a former step in which a propylene homopolymer component or a specific propylene copolymer component is produced in the presence of a metallocene catalyst carried on a support and a latter step in which propylene and a specific copolymer component are produced by gas phase polymerization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.