Supported hybrid metallocene catalyst, method for preparing the same, and method for preparing polyolefin using the same
AssigneeLG Chem, Ltd.
InventorsKi-Soo Lee, Hyo-Sun Lee, Eun-Jung Lee, Sang-Woo Lee, Choong-Hoon Lee
Life of this patent
Estimating the term…
Abstract
The present invention relates to a supported metallocene catalyst used for preparing polyolefin whose physical properties and molecular weight distribution can be easily controlled, a method for preparing the same, and a method for preparing polyolefin using the same, more particularly to a supported metallocene catalyst wherein more than two kinds of metallocenic transition compounds are supported on a metal oxide such as silica, a method for preparing the same, and a method for preparing polyolefin using the same.
Claims74
A supported hybrid metallocene catalyst with at least two different metallocene compounds supported on a single support, wherein:
- at least one metallocene compound is supported on the support by a chemical bond of its ligand to the support surface;
- and
- the other metallocene compound is supported on the support by a chemical bond of its ligand to a cocatalyst chemically bonded to the support surface.
A supported hybrid metallocene catalyst for preparing polyolefin having a bimodal or broad molecular weight distribution, which comprises:
- a) a catalyst component comprising:
- i) a first metallocene compound having an acetal, ketal, tertiary alkoxyalkyl, benzyloxyalkyl, substituted benzyloxyalkyl, monothioacetal or monothioketal group;
- ii) a second metallocene compound having a bridge linkage containing a Lewis base in cyclopentadiene, a cyclopentadiene derivative or a bridge group;
- and
- iii) an organometallic compound containing a group XIII metal;
- and
- b) a support having siloxane groups on the surface, on which the catalyst component is supported.
A method for preparing a supported hybrid metallocene catalyst wherein at least two different metallocene compounds are supported on a single support, which comprises:
- a) a step of contacting a supported metallocene catalyst in which at least one metallocene compound is supported with a cocatalyst to prepare an activated supported metallocene catalyst;
- and
- b) a step of supporting at least one metallocene compound different from the metallocene compound of the step a) on the activated supported metallocene catalyst.
A method for preparing a supported hybrid metallocene catalyst wherein at least two different metallocene compounds are supported on a single support, which comprises:
- a) a step of contacting at least one metallocene compound with a cocatalyst to prepare an activated metallocene compound;
- and
- b) a step of supporting the activated supported metallocene compound on a supported metallocene catalyst in which at least one metallocene compound different from the metallocene compound of the step a) is supported.
A method for preparing a supported hybrid metallocene catalyst for preparing polyolefin having a bimodal or broad molecular weight distribution, which comprises:
- a) a step of preparing a first supported catalyst by supporting a first metallocene compound having an acetal, ketal, tertiary alkoxyalkyl, benzyloxyalkyl, substituted benzyloxyalkyl, monothioacetal or monothioketal functional group on a support having siloxane groups on the surface;
- b) a step of preparing an activated first supported catalyst by contacting the first supported catalyst with an organometallic compound cocatalyst containing a group XIII metal;
- and
- c) a step of supporting a second metallocene compound having a bridge linkage containing at least one Lewis base in cyclopentadiene, a cyclopentadiene derivative or a bridge group on the activated first supported catalyst to prepare a supported hybrid metallocene catalyst wherein the first metallocene compound and the second metallocene compound are supported.
A method for preparing a supported hybrid metallocene catalyst for preparing polyolefin having a bimodal or broad molecular weight distribution, which comprises:
- a) a step of supporting a first metallocene compound having an acetal, ketal, tertiary alkoxyalkyl, benzyloxyalkyl, substituted benzyloxyalkyl, monothioacetal or monothioketal functional group on a support having siloxane groups on the surface to prepare a first supported catalyst;
- b) a step of contacting a second metallocene compound having a bridge linkage containing at least one Lewis base in cyclopentadiene, a cyclopentadiene derivative or a bridge group with an organometallic compound cocatalyst containing a group XIII metal to prepare an activated second metallocene compound;
- and
- c) a step of supporting the activated second metallocene compound on the first supported catalyst to prepare a supported hybrid metallocene catalyst wherein the first metallocene compound and the second metallocene compound are supported.
A method for olefin polymerization comprising a step of polymerizing an olefinic monomer in the presence of a supported hybrid metallocene catalyst wherein at least two different metallocene compounds, which comprise a first metallocene compound whose ligand is supported to the support surface by chemical bonding, a second metallocene compound whose ligand is supported to a cocatalyst, which is chemically bonded to the support surface, by chemical bonding, a cocatalyst and a support, are supported on a single support.
Dependencies are inferred from the claim text.