Polymerization process with mixed catalyst compositions

• US 7,192,902 B2
• Filed: 11/16/2001
• Issued: 03/20/2007
• Est. Priority Date: 01/16/2001
• Status: Expired due to Fees

• Current Assignee: ExxonMobil Chemical Patents Inc. (Exxon Mobil Corporation)
• Original Assignee: ExxonMobil Chemical Patents Inc. (Exxon Mobil Corporation)
• Inventors: Brinen, Jeffrey L., Cozewith, Charles
• Primary Examiner(s): Rabago; Roberto
• Application Number:
  US10/250,926
• Publication Number:
  US 20040048990A1
• Time in Patent Office: 1,950 Days
• Field of Search: 502/117, 502/129, 502/152, 526/113, 526/114, 526/118, 526/119, 526/160, 526/170
• US Class Current: 502/129
• CPC Class Codes: C08F 10/00 Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
• CPC Class Codes: C08F 2420/02 Cp or analog bridged to a non-Cp X anionic donor
• CPC Class Codes: C08F 4/65904 in combination with another component of C08F4/64
• CPC Class Codes: C08F 4/65908 in combination with an ionising compound other than alumoxane, e.g. (C6F5)4B-X+
• CPC Class Codes: C08F 4/65912 in combination with an organoaluminium compound
• CPC Class Codes: C08F 4/65916 supported on a carrier, e.g. silica, MgCl2, polymer
• CPC Class Codes: C08F 4/6592 containing at least one cyclopentadienyl ring, condensed or not, e.g. an indenyl or a fluorenyl ring
• CPC Class Codes: C08F 4/65927 two cyclopentadienyl rings being mutually bridged
• CPC Class Codes: Y10S 526/943 Polymerization with metallocene catalysts

Abstract

The application describes a mixed olefin polymerization catalyst composition comprising a support, a reaction product of at least one first organometallic compound and a first activator capable of rendering the first organometallic compound active for insertion polymerization, and at least one second organometallic compound, the activator incapable of rendering the second organometallic compound active for polymerization of the monomers. The mixed catalyst composition can be used to prepare a first polymer component in a first polymerization reactor stage and then, when an effective activator is added for the second organometallic compound, the catalyst composition can be used to prepare a second polymer composition that is homogeneously blended with the first polymer component.

Claims

1. A mixed catalyst composition for polymerizing monomers comprising a support, a least one first metallocene, Catalyst-A, an activator capable of rendering Catalyst-A active for olefin polymerization, a second metallocene, Catalyst-B, wherein if contacted with said Catalyst-B, said activator is incapable of activating Catalyst-B for olefin polymerization.

2. The composition of claim 1 wherein the activator comprises at least one NCA precursor.

3. The composition of claim 1 wherein the activator consists essentially of at least one NCA precursor.

4. The composition of claim 1 wherein the activator consists of at least one NCA precursor.

5. The composition of claim 1 wherein Catalyst-B is capable of being activated by an alumoxane.