Claims
- 1. A catalytic composition for the polymerization of olefins comprising:
- (a) at least one titanium compound, the titanium compound being essentially a titanium (III) compound, the overall content of titanium (II) and titanium (IV) being less than or equal to 15% of the total titanium content;
- (b) at least one halogenated organo-aluminum compound of formula X.sub.2 Al(CH.sub.2).sub.n AlX.sub.2, in which X is a halogen and n is between 1 and 10; and
- (c) at least one magnesium halide in suspension in a solvent of at least one .alpha.,.omega.-di-halogenoalkane.
- 2. The catalytic composition according to claim 1, further comprising at least one vanadium (III), (IV) or (V) compound, the atomic ratio V/Ti being between 0 and 6.
- 3. The catalytic composition according to claim 1, wherein the atomic ratio Cl/Ti is between 10 and 180, the ratio Al/Ti is between 0.5 and 12 and the ratio Mg/Ti is between 1 and 15.
- 4. The catalytic composition of claim 1, wherein the dihalogenoalkane has the formula X(CH.sub.2).sub.n X', wherein X and X', which may be the same or different, is a halogen atom and n is between 1 and 10.
- 5. The catalytic composition according to claim 1 further comprising at least one activator selected from compounds of the following formulas:
- AlR.sub.3 ;
- RR'Al-O-AlR"R'";
- R-SiH.sub.2 -O-AlR'R"; and
- mixtures thereof,
- in which R, R', R", and R'" are alkyl groups having 1 to 12 carbon atoms.
Priority Claims (1)
Number |
Date |
Country |
Kind |
88 08447 |
Jun 1988 |
FRX |
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Parent Case Info
This is a division of application Ser. No. 07/741,621, filed Aug. 7, 1991, and now U.S. Pat. No. 5,264,088 which is a division of application Ser. No. 07/369,229, filed Jun. 22, 1989, now U.S. Pat. No. 5,068,014.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
3546083 |
Ort et al. |
Dec 1970 |
|
3677911 |
Mottus et al. |
Jul 1972 |
|
3787383 |
Mottus et al. |
Jan 1974 |
|
Foreign Referenced Citations (4)
Number |
Date |
Country |
246110 |
May 1960 |
AUX |
2209297 |
Sep 1972 |
DEX |
1118987 |
Jul 1968 |
GBX |
1226724 |
Mar 1971 |
GBX |
Divisions (2)
|
Number |
Date |
Country |
Parent |
741621 |
Aug 1991 |
|
Parent |
369229 |
Jun 1989 |
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