Claims
- 1. Catalysts for the polymerization of olefins comprising the product obtained by mixing:
- (A) an alkyl Al compound or an alkyl Al compound of which from 5 to 90% is in a combined form with an electron-donor compound selected from the group consisting of esters of aromatic carboxylic acids and of inorganic acids, secondary amines and tertiary amines, with
- (B) a solid catalyst-forming component obtained by reacting a Ti compound containing at least one Ti-halogen linkage with at least one of the following substances:
- (1) a hydrocarbyl electron-donor compound ED which does not contain active hydrogen atoms and an adduct (a) of a Mg dihalide with at least one hydrocarbyl electron-donor compound AH containing active hydrogen atoms and present in the adduct in an amount of at least 0.5 mole/mole of Mg dihalide, electron-donor compound ED being reacted in an amount of not less than 0.05 mole/mole of compound AH of the adduct;
- (2) an adduct (b) of at least a Mg dihalide with a compound AH and ED, as defined in (1) above, compound ED being present in an amount ranging from 0.05 to 1.0 mole/mole of compound AH, and adducts (a) and (b) being prepared without co-grinding of the Mg dihalide with compounds AH and ED;
- the amount of compound ED which remains in the solid after extraction thereof with TiCl.sub.4 at 80.degree. C. for two hours being comprised between 0.3 and 3.0 moles/gram atom of Ti, and the amount of Ti compounds extractable with TiCl.sub.4 at 80.degree. C. being lower than 50%.
- 2. Catalysts according to claim 1, in which the alkyl Al compound of component (A) is an Al trialkyl and the electron-donor compound is an ester of silicic acid.
- 3. Catalysts according to claim 2, in which the silicic acid ester is ethyl silicate.
Priority Claims (1)
Number |
Date |
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25345 A/77 |
Jul 1977 |
ITX |
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Parent Case Info
This is a division of application Ser. No. 134,773 filed Mar. 28, 1980 and now U.S. Pat. No. 4,294,721 which in turn is a continuation of Ser. No. 921,717 filed July 3, 1978, (now abandoned).
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
3642746 |
Kashiwa et al. |
Feb 1972 |
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4143223 |
Toyota et al. |
Mar 1979 |
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4187196 |
Giannini et al. |
Feb 1980 |
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4226741 |
Luciani et al. |
Oct 1980 |
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Divisions (1)
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Number |
Date |
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Parent |
134773 |
Mar 1980 |
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Continuations (1)
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Number |
Date |
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Parent |
921717 |
Jul 1978 |
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