Components and catalysts for the polymerization of olefins
AssigneeBasell Poliolefine Italia S.r.l.
InventorsGiampiero Morini, Giulio Balbontin, Yuri V. Gulevich
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Abstract
The present invention relates to catalyst components for the polymerization of olefins, and to the catalyst obtained therefrom, particularly suitable for the stereospecific polymerization of olefins, comprising Ti, Mg, halogen and an electron donor compound selected from heteroatom containing esters of malonic acids (heteroatom containing malonates). Said catalyst components when used in the polymerization of olefins, and in particular of propylene, are capable to give polymers in high yields and with high isotactic index expressed in terms of high xylene insolubility.
Claims14
A solid catalyst component for the polymerization of olefins CH2═CHR, in which R is hydrogen or a hydrocarbyl radical with 1-12 carbon atoms, comprising Mg, Ti, halogen and at least an heteroatom containing malonate of formula (I):
- wherein R1 and R2, equal to or different from each other, are each H, a C1-C20 linear or branched alkyl, alkenyl, cycloalkyl, aryl, arylalkyl or alkylaryl group and said R1 and R2 can also be joined to form a cyclic group;
- R3 and R4 are independently selected from C1-C20 linear or branched alkyl, alkenyl, cycloalkyl, aryl, arylalkyl or alkylaryl group and R3 and R4 can also be joined to form a cyclic group;
- with the proviso that at least one of the R1 to R4 groups contains at least one heteroatom selected from the group consisting of F, Cl, Br and Si, and that when R3 and R4 are C2 alkyls, R1 or R2 do not contain O.
Dependencies are inferred from the claim text.