Process for producing propylene block copolymers
US5623022A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 13, 1995 |
| Grant date | Apr 22, 1997 |
| Priority date | — |
| Expiry date | Jul 13, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F4/65927
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A propylene block copolymer having a high impact resistance is prepared without the generation of finely divided particles or the adhesion to the reactor, which propylene block copolymer having a weight ratio of 5/95-70/30 (process (1)/process (2)) is obtained by carrying out the particular polymerization processes (1) and (2) in this sequence under the action of the catalyst comprising the following A and B. PA1 A: particular transition metal compound. PA1 B: an alumoxane, the reaction product of an alkylboronic acid with an organoAl, a Lewis acid or ionic compound. PA1 Process (1): process for copolymerizing propylene and a specified comonomer in a ratio of 0/100-80/20. PA1 Process (2): process for producing a propylene polymer having a specified comonomer in an amount of 10% by weight or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.