Process for producing a propylene block copolymer
US5468810A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 1994 |
| Grant date | Nov 21, 1995 |
| Priority date | — |
| Expiry date | Jul 26, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/901
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A propylene block copolymer having a high rigidity and an excellent impact strength is produced by (1) first polymerizing propylene or a mixture of propylene and another ethylenically unsaturated hydrocarbon monomer in the presence of a catalyst comprising a Ti-containing solid component (A), an organic Al compound-containing component (B) and an alkoxyl silicon compound-containing component (C), and (2) second copolymerizing, in a gas phase, propylene and another ethylenically unsaturated hydrocarbon monomer in the presence of the first crystalline polymer of step (1) by re-using the catalyst of first polymerization, and in the presence of a saturated hydrocarbon with 6 or more carbon atoms, thereby forming an elastomeric fraction incorporated into the crystalline polymeric fraction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.