Spherical components and catalysts for the polymerization of olefins
AssigneesMontell Technology Company BV, Montell North America Inc.
InventorsGiampiero Morini, Enrico Albizzati, Umberto Giannini, Matteo Nicolini
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Abstract
Spherical components of catalysts for the polymerization of olefins comprising: (a) a vanadium compound selected from the compounds of formula VOX.sub.2 Y or VX.sub.n Y.sub.n-4n, where X is Cl or Br and Y is Cl, Br OR or NR.sup.I.sub.2 (b) MgCl.sub.2 in spherical form. Said components have an average diameter greater than 1 .mu.m, a surface area of at least 10 m.sup.2 /g, a porosity of at least 0.1 g/cm.sup.3 and an X-ray spectrum having particular characteristics.
Claims12
A spherical component of catalysts for the polymerization of olefins, which comprises a single transition metal compound, the single transition metal compound consisting essentially of a vanadium compound having the formula VOX.sub.2 Y or VX.sub.n Y.sub.4-n, wherein:
- X is Cl or Br;
- Y is Cl, Br, OR or NR.sup.I.sub.2, wherein:
- R is a C.sub.1 -C.sub.18 aliphatic or cycloaliphatic or aromatic hydrocarbon radical;
- R.sup.I is a C.sub.1 -C.sub.10 aliphatic or cycloaliphatic hydrocarbon radical;
- and
- 2.ltoreq.n.gtoreq.4;
- the vanadium compound being supported on an MgCl.sub.2 support in spherical form and the component having an average diameter greater than 1 .mu.m, a surface area of at least 10 m.sup.2 /g, a porosity of at least 0.1 cm.sup.3 /g and an X-ray spectrum wherein:
- a) reflections are present at angles 2.theta. of 35.degree. and 14.95.degree.;
- or
- b) the reflection at 2.theta.=35.degree. is replaced by a halo showing a maximum of intensity between angles 2.theta. of 33.degree. and 35.degree..
Dependencies are inferred from the claim text.