Process for making alpha-olefin polymers or copolymers with high isotacticity index
US4287093A · kind A · utility
6Cited by
3References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 14, 1980 |
| Grant date | Sep 1, 1981 |
| Priority date | — |
| Expiry date | Apr 14, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F10/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for making crystalline polymers or copolymers of alpha-olefins containing 3 to 8 carbon atoms, such as polypropylene, by polymerization with a catalyst consisting of a combination of titanium chloride and an organic aluminium compound, in the presence of a stereospecificity additive. This stereospecificity additive is a cyclic polyether of the crown ether type, which may contain sulphur atoms and/or nitro radicals; this additive may be used together with an activator. The process produces polymers or copolymers with a high isotacticity index, while keeping catalyst activity sufficiently high.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.