US4331561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalysts for polymerizing alpha-olefins and process for polymerizing alpha-olefins in contact with said catalysts
Assignee: Montedison SpA
•
Filing: 1980-01-28
•
Granted: 1982-05-25
•
Expires: 2000-01-28
Abstract
Abstract New highly active and highly stereospecific catalysts for the polymerization of alpha-olefins are disclosed, the starting components of which are (a) an organometallic-compound of Al free from halogen atoms bound directly to the Al atom; (b) an electron-donor compound (such as a Lewis base) in an amount such that 15% to 100% of the organometallic Al compound (a) is combined with the electron-donor compound; and (c) a solid component comprising, at least on surface, the reaction product of a halogen. Mg compound with a tetravalent Ti compound and with an electron-donor compound, the molar ratio electron-donor compound/Ti being higher than 0.2, and the molar ratio halogen atoms/Ti being higher than 4. Processes for polymerizing the alpha-olefins and mixtures thereof with ethylene in contact with the new catalysts are also disclosed.
Inventors
- 👤 Luciano Luciani
- 👤 Norio Kashiwa
- 👤 Pier C. Barbe
- 👤 Akinori Toyota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:42
CPC Classifications
C; C08; C08F; C08F10/00; C08F4/00; C08F4/02; C08F4/022
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
204 words
Catalysts for the polymerization of alphaolefins containing at least 3 carbon atoms and mixtures thereof with ethylene, comprising the product obtained by contacting the following starting components: (a) a hydrocarbyl Al compound not containing halogen atoms directly bound to Al; (b) an electron-donor selected from the group consisting of alkyl silicates and aryl silicates; (c) a solid component comprising, at least on the surface, the reaction product of a Mg dihalide with a halogenated tetravalent Ti compound selected from the group consisting of Ti tetrahalides and Ti halogen alcoholates and with a hydrocarbyl electron-donor capable of forming complexes with Mg dihalides, the molar ratio electron-donor/Ti in said product being higher than 0.2 and the molar ratio halogen atoms/Ti being comprised between 10 and 90, component (c) being further characterized in that at least 80% by weight of the tetravalent Ti compounds contained therein is insoluble in boiling n-heptane and in that at least 50% by weight of the Ti compounds insoluble in n-heptane is insoluble in TiCl 4 at 80° C., and also in that the surface area of the product insoluble in TiCl 4 at 80° C., and the surface area of component (c) as such, is higher than 40 m 2 /g.
Claim 2
Dependent Claim
204 words
Catalysts for the polymerization of alphaolefins containing at least 3 carbon atoms and mixtures thereof with ethylene, comprising the product obtained by contacting the following starting components: (a) a hydrocarbyl Al compound not containing halogen atoms directly bound to Al; (b) an electron-donor selected from the group consisting of alkyl silicates and aryl silicates; (c) a solid component comprising, at least on the surface, the reaction product of a Mg dihalide with a halogenated tetravalent Ti compound selected from the group consisting of Ti tetrahalides and Ti halogen alcoholates and with a hydrocarbyl electron-donor capable of forming complexes with Mg dihalides, the molar ratio electron-donor/Ti in said product being higher than 0.2 and the molar ratio halogen atoms/Ti being comprised between 10 and 90, component (c) being further characterized in that at least 80% by weight of the tetravalent Ti compounds contained therein is insoluble in boiling n-heptane and in that at least 50% by weight of the Ti compounds insoluble in n-heptane is insoluble in TiCl 4 at 80° C., and also in that the surface area of the product insoluble in TiCl 4 at 80° C., and the surface area of component (c) as such, is higher than 40 m 2 /g.
Claim 3
Dependent Claim
158 words
A solid component for catalysts for polymerizing alpha-olefins, comprising at least on the surface, the reaction product of a Mg dihalide with a halogenated tetravalent Ti compound selected from the group consisting of Ti tetrahalides and Ti halogen alcoholates and with an electron-donor selected from the group consisting of alkyl silicates and aryl silicates, the molar ratio electron-donor Ti in said product being higher than 0.2 and the molar ratio halogen atoms/Ti being comprised between 10 and 90, said component being further characterized in that at least 80% by weight of the tetravalent Ti compounds contained therein is insoluble in boiling n-heptane and in that at least 50% by weight of the Ti compounds insoluble in n-heptane is insoluble in TiCl 4 at 80° C., and also in that the surface area of the product insoluble in TiCl 4 at 80° C., and the surface area of said component as such, is higher than 40 m 2 /g.
Claim 4
Dependent Claim
158 words
A solid component for catalysts for polymerizing alpha-olefins, comprising at least on the surface, the reaction product of a Mg dihalide with a halogenated tetravalent Ti compound selected from the group consisting of Ti tetrahalides and Ti halogen alcoholates and with an electron-donor selected from the group consisting of alkyl silicates and aryl silicates, the molar ratio electron-donor Ti in said product being higher than 0.2 and the molar ratio halogen atoms/Ti being comprised between 10 and 90, said component being further characterized in that at least 80% by weight of the tetravalent Ti compounds contained therein is insoluble in boiling n-heptane and in that at least 50% by weight of the Ti compounds insoluble in n-heptane is insoluble in TiCl 4 at 80° C., and also in that the surface area of the product insoluble in TiCl 4 at 80° C., and the surface area of said component as such, is higher than 40 m 2 /g.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |