Claims
- 1. Highly active catalysts for the polymerization of olefins and obtained by mixing
- (a) a catalyst-forming component which is a hydride or organo-metallic compound of a metal belonging to one of Groups I to III inclusive of the Mendelyeev Periodic Table
- with
- (b) a supported catalyst-forming component obtained by contacting a titanium compound containing organic radicals bound to oxygen through a carbon atom and in which at least one Ti atom is bound through the oxygen atom to the organic radical, any valency of the Ti atom not satisified by organic radicals bound to oxygen through the carbon atom being satisfied by halogen, with a carrier comprising an anhydrous magnesium dihalide in an active form characterized in that its X-ray powder spectrum does not show the most intense diffraction line as it appears in the X-ray powder spectrum of the normal, non-active magnesium dihalide, the spectrum of the active magnesium dihalide showing a broadening of said most intense diffraction line.
- 2. Catalysts according to claim 1, characterized in that the amount of the titanium compound on the carrier is from 0.01% to 30% by weight.
- 3. Catalysts according to claim 1, characterized in that the amount of the titanium compound on the carrier is from 1% to 10% by weight.
- 4. Catalysts according to claim 1, characterized in that the anhydrous magnesium dihalide is anhydrous magnesium dichloride.
- 5. Catalysts according to claim 1, characterized in that the anhydrous magnesium dihalide is anhydrous magnesium dibromide.
- 6. The method of preparing catalysts which are highly active in the polymerization of olefins which consists of mixing
- (a) a catalyst-forming component which is a hydride or organo-metallic compound of a metal belonging to one of Groups I to III inclusive of the Mendelyeev Periodic Table
- with
- (b) a supported catalyst-forming component obtained by contacting a titanium compound containing organic radicals bound to oxygen through a carbon atom and in which at least one Ti atom is bound through the oxygen atom to the organic radical, any valency of the Ti atom not satisfied by organic radicals bound to oxygen through the carbon atom being satisfied by halogen, with a carrier comprising an anhydrous magnesium dihalide in an active condition characterized in that its X-ray powder spectrum does not show the most intense diffraction lines as it appears in the X-ray powder spectrum of the normal, non-active magnesium dihalide, the spectrum of the active magnesium dihalide showing a broadening of said most intense diffraction line.
- 7. The method according to claim 6, in which catalyst-forming component (b) is obtained by cogrinding the titanium compound with a starting magnesium dihalide in its normal non-activated condition.
- 8. The method of claim 7, wherein the co-grinding of the titanium compound and anhydrous magnesium dihalide is carried out in a ball mill, in the absence of inert liquid diluents.
- 9. The method according to claim 6, in which catalyst-forming component (b) is obtained by contacting the titanium compound with an anhydrous magnesium dihalide in preactivated condition.
- 10. The method according to claim 6, in which catalyst-forming component (b) is obtained by contacting the titanium compound with a preactivated magnesium dihalide which is the decomposition product of an organo-metallic compound of formula RMgX, in which R is a hydrocarbon radical and X is halogen.
- 11. A process for the catalytic polymerization of ethylene to a linear, highly crystalline polyethylene useful as produced without requiring special purifying after-treatments for the removal of catalyst residues therefrom, which comprises polymerizing the ethylene in contact with a catalyst according to claim 1.
- 12. The process of claim 11, wherein the ethylene is polymerized in contact with a catalyst according to claim 1 and in the presence of a regulator of the molecular weight of the polyethylene produced.
Priority Claims (1)
Number |
Date |
Country |
Kind |
14473 A/69 |
Mar 1969 |
ITX |
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Parent Case Info
This is a continuation of application Ser. No. 397,111 filed Sept. 13, 1973 now abandoned, which in turn is a continuation-in-part of Ser. No. 248,597, filed Apr. 28, 1972 and now abandoned which was a continuation of Ser. No. 22,011, filed Mar. 23, 1970 and now abandoned.
US Referenced Citations (9)
Foreign Referenced Citations (2)
Number |
Date |
Country |
222426 |
Jun 1959 |
AUX |
2013730 |
Oct 1970 |
DEX |
Continuations (2)
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Number |
Date |
Country |
Parent |
397111 |
Sep 1973 |
|
Parent |
22011 |
Mar 1970 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
248597 |
Apr 1972 |
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