Process for making alpha-olefin polymers or copolymers with high isotacticity index
US4228253A · kind A · utility
4Cited by
1References
35Claims
0Family size
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Inventor
Key dates
| Filing date | Jun 13, 1979 |
| Grant date | Oct 14, 1980 |
| Priority date | — |
| Expiry date | Jun 13, 1999 |
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 aluminum 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.