Catalyst Components for the Polymerization of Olefins
AssigneeBasell Poliolefine Italia S.r.l.
InventorsDiego Brita, Gianni Collina
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Abstract
The present invention relates to catalysts component for the polymerization of ethylene and its mixtures with olefins CH2═CHR, wherein R is an alkyl, cycloalkyl or aryl radical having 1-12 carbon atoms, comprising Ti, Mg, halogen, and electron donor belonging to 1,2-diethers as internal electron donor compound. The catalyst of the invention is suitably used in (co)polymerization processes of ethylene to prepare (co)polymers having narrow Molecular Weight Distribution (MWD) and high bulk density.
Claims10
1-9. (canceled)
Substantially spherical catalyst components for polymerizing of olefins comprising Mg, Ti, halogen, and an electron donor compound of formula (I):
- RaCR1(OR4)—CR2R3(OR5) (I)
- wherein
- Ra is methyl or hydrogen, or is condensed with R4 to form a cycle;
- R1, R2 and R3 are, independently, hydrogen or C1-C20 hydrocarbon groups optionally comprising heteroatoms;
- R4 and R5 are, independently, C1-C20 alkyl groups or R6CO— groups, or R4 and R5 can be joined with R and R3 respectively to form a cycle;
- and
- R6 is a C1-C20 alkyl group;
- with the provisos that when Ra is hydrogen R4 and R5 are not simultaneously methyl, and when Ra and R4 form a cycle R5 is a C1-C20 alkyl group.
A catalyst for polymerizing olefins of formula CH2═CHR′, wherein R′ is hydrogen or a hydrocarbyl radical comprising 1-12 carbon atoms, the catalyst comprising a product of a reaction between:
- (a) a catalyst component comprising Mg, Ti, halogen, and an electron donor compound of formula (I):
- RaCR1(OR4)—CR2R3(OR5) (I)
- wherein
- Ra is methyl or hydrogen, or is condensed with R4 to form a cycle;
- R1, R2 and R3 are, independently, hydrogen or C1-C20 hydrocarbon groups optionally comprising heteroatoms;
- R4 and R5 are, independently, C1-C20 alkyl groups or R6CO— groups, or R4 and R5 can be joined with R and R3 respectively to form a cycle;
- and
- R6 is a C1-C20 alkyl group;
- with the provisos that when Ra is hydrogen R4 and R5 are not simultaneously methyl, and when Ra and R4 form a cycle R5 is a C1-C20 alkyl group;
- and
- (b) an alkylaluminum compound.
A process for polymerizing olefins of formula CH2═CHR′, wherein R′ is hydrogen or a hydrocarbyl radical comprising 1-12 carbon atoms, the process being carried out in presence of a catalyst, the catalyst comprising a product of a reaction between:
- (a) a catalyst component comprising Mg, Ti, halogen, and an electron donor compound of formula (I):
- RaCR1(OR4)—CR2R3(OR5) (I)
- wherein
- Ra is methyl or hydrogen, or is condensed with R4 to form a cycle;
- R1, R2 and R3 are, independently, hydrogen or C1-C20 hydrocarbon groups optionally comprising heteroatoms;
- R4 and R5 are, independently, C1-C20 alkyl groups or R6CO— groups, or R4 and R5 can be joined with R and R3 respectively to form a cycle;
- and
- R6 is a C1-C20 alkyl group;
- with the provisos that when Ra is hydrogen R4 and R5 are not simultaneously methyl, and when Ra and R4 form a cycle R5 is a C1-C20 alkyl group;
- and
- (b) an alkylaluminum compound.
Dependencies are inferred from the claim text.