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US 2004/0110632 A1Published application
Method for the preparation of well-defined metal acetamidinate-based catalysts on solid supports
AssigneeUniversity of Maryland, College Park
InventorsLawrence R. Sita, Yonghui Zhang
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Abstract
An olefin polymerization pre-catalyst, an activated catalyst and a process for preparing the catalysts are described herein. The pre-catalyst has the formula: 1 wherein the groups M and R1-R4 are defined herein. The group R4 includes a solid-support.
Claims34
An olefin polymerization catalyst comprising a pre-catalyst having the formula:
- 10
- wherein M is Ti, Zr or Hf;
- each R1 is independently hydrogen or alkyl or two adjacent R1 form an aryl group;
- each R2 and R3 is optionally substituted and is independently alkyl, cycloalkyl, SiX3, or aryl;
- or
- one R1 and one of R2 or R3 are taken together to form an alkyl, aryl, arylalkyl or alkylarylalkyl bridge;
- R4 comprises alkyl, cycloalkyl, SiX3, aryl, BR63 or a solid support;
- each R5 is halo, optionally substituted alkyl, cycloalkyl, aryl, or arylalkyl;
- R6 is optionally substituted phenyl;
- B is the element boron;
- and
- X is independently halo, alkyl, alkoxy or aryl.
9 more elements
A process for preparing an olefin polymerization catalyst, comprising:
- (a) deprotonating a metal acetamidinate having the formula:
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- wherein M is Ti, Zr or Hf;
- each R1 is independently hydrogen or alkyl or two adjacent R1 form an aryl group;
- each R2 and R3 is optionally substituted and is independently alkyl, cycloalkyl, SiX3, or aryl;
- or
- one R1 and one of R2 or R3 are taken together to form an alkyl, aryl, arylalkyl or alkylarylalkyl bridge;
- each R5 is halo, optionally substituted alkyl, cycloalkyl, aryl, or arylalkyl;
- X is independently halo, alkyl, alkoxy or aryl;
- to form an intermediate;
- and
- (b) contacting said intermediate with an electrophile to form a precatalyst.
9 more elements
Dependencies are inferred from the claim text.