Claims
- 1. Process for the stereoregular polymerization of alpha-olefins of the formula CH.sub.2 .dbd.CHR wherein R is an alkyl radical having 1-6 carbon atoms and mixtures thereof with ethylene, which process comprises polymerizing the olefins in contact with a catalyst the starting catalyst-forming components of which comprise:
- (a) an addition reaction product of an electron-donor compound (or Lewis base) selected from the group consisting of esters of silicic acid with an Al-trialkyl compound or with an Al-alkyl compound containing two or more Al atoms linked together through an oxygen or a nitrogen atom, the amount of Al-alkyl compound contained in a combined form with the ester in catalyst-forming component (a) being from 0.05 to 1.0 mole per mole of the starting Al-compound; and
- (b) the product obtained by contacting a Ti compound selected from the group consisting of halogenated bi-, tri-, and tetravalent Ti compounds and complexes of said Ti compounds with an electron-donor compound, with a support which comprises, as the essential support material thereof, an anhydrous bihalide of Mg or Mn in an active state such that the X-rays powder spectrum of component (b) does not show the most intense diffraction lines as they appear in the X-rays powder spectrum of normal, nonactivated Mg or Mn bihalide, the X-rays powder spectrum of component (b) showing a broadening of said most intense diffraction lines.
Priority Claims (1)
Number |
Date |
Country |
Kind |
26275 A/71 |
Jun 1971 |
ITX |
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Parent Case Info
This is a continuation of application Ser. No. 955,762 filed Oct. 30, 1978 and now U.S. Pat. No. 4,187,196 which in turn is a continuation of Ser. No. 795,363 filed May 9, 1977 and now abandoned; which in turn is a continuation in part of Ser. No. 503,766 filed Sept. 6, 1974 and now abandoned; which in turn is a continuation of Ser. No. 265,455 filed June 23, 1972 and now abandoned.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
3238146 |
Hewett et al. |
Mar 1966 |
|
3554993 |
Mobuly et al. |
Jan 1971 |
|
3676415 |
Diedrich et al. |
Jul 1972 |
|
4107414 |
Giannini et al. |
Aug 1978 |
|
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Number |
Date |
Country |
625748 |
Aug 1961 |
CAX |
1958046 |
Jun 1970 |
DEX |
2029992 |
Dec 1970 |
DEX |
2153520 |
May 1972 |
DEX |
918740 |
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GBX |
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GBX |
Continuations (3)
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Number |
Date |
Country |
Parent |
955762 |
Oct 1978 |
|
Parent |
795363 |
May 1977 |
|
Parent |
265455 |
Jun 1972 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
503766 |
Sep 1974 |
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