Catalyst system for the polymerization of olefins

Patent metadata

Field	Value
Publication number	US-9505855-B2
Application number	US-99668309-A
Country	US
Kind code	B2
Filing date	Jun 8, 2009
Priority date	Jun 13, 2008
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

The present invention relates to catalysts systems for the polymerization of olefins CH 2 ═CHR, wherein R is an alkyl, cycloalkyl or aryl radical having 1-12 carbon atoms, comprising (A) a solid catalyst component comprising Ti, Mg, and halogen (B) an aluminum alkyl compound and (C) a mono or dihalogenated hydrocarbon compound. Said catalyst systems have improved polymerization activity.

First claim

What is claimed is:

1. A catalyst system for the polymerization of olefins in a gas-phase process, comprising:
(A) a solid catalyst component comprising Ti, Mg, halogen, and having a porosity (P F ), measured by the mercury method and due to pores with radius equal to or lower than 1 μm, of at least 0.3 cm 3 /g;
(B) at least one alkyl aluminum compound; and
(C) a halogenated hydrocarbon selected from the group consisting of cyclopentylchloride and cyclohexylchloride,
wherein the (B)/(C) molar ratio is 5 to 20, and a molar ratio between (C) and the Ti atoms contained in (A) is higher than 3.

2. The catalyst according to claim 1 in which the catalyst component (A) has a porosity P F determined with the mercury method of higher than 0.40 cm 3 /g.

3. The catalyst according to claim 1 in which the particles of the catalyst component (A) have an average diameter comprised between 40 and 130 μm.

4. A process for the gas-phase (co)polymerization of ethylene comprising contacting ethylene with the catalyst system according to claim 1 .

5. The catalyst system of claim 1 , wherein the solid catalyst component has a porosity (P F ), measured by the mercury method and due to pores with radius equal to or lower than 1 μm, of at least 0.5 cm 3 /g.

6. The catalyst system of claim 1 , wherein the at least one alkyl aluminum compound comprises a mixture of triethylaluminum and triisobutylaluminum.

Assignees

• Fushimi Masaki
• Meier Gerhardus
• Herrera Salinas Maclovio
• Schneider Martin
• Morini Giampiero
• Basell Poliolefine Italia Srl

Inventors

• Fushimi Masaki
• Meier Gerhardus
• Herrera Salinas Maclovio
• Schneider Martin
• Morini Giampiero

Classifications

• C08F4/649

  organic · CPC title

• C08F10/02 Primary

  Ethene · CPC title

• C08K5/02

  Halogenated hydrocarbons {(C08K5/0091 takes precedence)} · CPC title

• C08F4/6493

  containing halogen · CPC title

• C08F4/642 Primary

  Component covered by group C08F4/64 with an organo-aluminium compound {(C08F4/64003 - C08F4/64196 take precedence)} · CPC title