Alpha-olefin polymerization catalyst system which contains an aromatic silane compound
AssigneeBasell Technology Company BV
InventorsEric J. Evain, Constantine A. Stewart
Life of this patent
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Abstract
Aromatic silane compounds containing at least an aromatic ring bound directly to the silicon atom, wherein the aromatic ring has at least one substituent located in the ortho position selected from C1-10 hydrocarbon groups, are useful as electron donors in olefin polymerization catalysts for the production of polyolefins having a stereoblock content of from about 7 to about 25%.
Claims15
An aromatic silane compound having formula (I):
- wherein
- R1 is selected from the group consisting of linear or branched C1-26 alkyl, C2-26 alkenyl, C1-26 alkoxy, C2-26 alkoxyalkyl, C7-26 arylalkyl, C3-26 cycloalkyl and C4-26 cycloalkoxy groups, optionally containing one or more halogen atoms;
- R2 is an aromatic ring having at least one substituent in the ortho position selected from C1-10 hydrocarbon groups with the proviso that when R2 comprises a naphthyl group, R1 is a linear C1–C26 alkyl;
- and
- R3 and R4, the same or different from each other, are selected from the group consisting of linear or branched C1-10 alkyl and C3-10 cycloalkyl groups.
A catalyst system for the polymerization of olefins comprising:
- (A) an aromatic silane compound having formula (I):
- wherein
- R1 is selected from the group consisting of linear or branched C1-26 alkyl, C2-26 alkenyl, C1-26 alkoxy, C2-26 alkoxyalkyl, C7-26 arylalkyl, C3-26 cycloalkyl and C4-26 cycloalkoxy groups, optionally containing one or more halogen atoms;
- R2 is an aromatic ring having at least one substituent in the ortho position with the proviso that when R2 comprises a naphthyl group, R1 is a linear C1–C26 alkyl;
- and
- R3 and R4, the same or different from each other, are selected from the group consisting of linear or branched C1-10 alkyl and C3-10 cycloalkyl groups;
- (B) an aluminum alkyl compound;
- and
- (C) a solid catalyst component comprising Mg, Ti, halogen and an electron donor compound.
A process for the polymerization of alpha-olefins comprising polymerizing propylene in the presence of the catalyst system comprising:
- (A) an aromatic silane compound having formula (I):
- wherein
- R1 is selected from the group consisting of linear or branched C1-26 alkyl, C2-26 alkenyl, C1-26 alkoxy, C2-26 alkoxyalkyl, C7-26 arylalkyl, C3-26 cycloalkyl and C4-26 cycloalkoxy groups, optionally containing one or more halogen atoms;
- R2 is an aromatic ring having at least one substituent in the ortho position with the proviso that when R2 comprises a naphthyl group, R1 is a linear C1–C26 alkyl;
- and
- R3 and R4, the same or different from each other, are selected from the group consisting of linear or branched C1-10 alkyl and C3-10 cycloalkyl groups;
- (B) an aluminum alkyl compound;
- and
- (C) a solid catalyst component comprising Mg, Ti, halogen and an electron donor compound, to produce a polyolefin having a stereoblock content of from about 7 to about 25%.
Dependencies are inferred from the claim text.