Title:
【発明の名称】生産性を向上させた触媒組成物
Document Type and Number:
Japanese Patent JP2001525458
Kind Code:
A
Abstract:
Described are solid olefin polymerization catalysts that have, inter alia, very high productivities (at least 18,000 grams of polyethylene per gram of catalyst in one hour) as shown by a standard test procedure for measuring this property or characteristic. Such particulate catalysts can be prepared by prepolymerizing vinylolefin with a Group 4 metallocene-aluminoxane solution, using proportions of vinylolefin (most preferably, ethylene) in the range of about 150 to about 1500, and preferably in the range of about 175 to about 1000, moles per mole of Group 4 metallocene used in forming the solution. The atom ratio of aluminum to Group 4 metal in the solution is in the range of about 150:1 to about 1500:1, and preferably in the range of about 175:1 to about 1000:1. In addition, the Group 4 metallocene ingredient used in forming these highly productive catalysts has in its molecular structure at least one polymerizable olefinic substituent. These particulate catalysts do not contain, and thus are not produced in the presence of, a preformed support such as an inorganic compound (silica or etc.) or a preformed particulate polymeric support.
Inventors:
Deaf Embatsha, Stephen Pee
Application Number:
JP2000524326A
Publication Date:
December 11, 2001
Filing Date:
November 03, 1998
Export Citation:
Assignee:
Albemarle Corporation
International Classes:
C08F4/02; C08F4/60; C08F4/647; C08F4/6592; C08F10/00; C08F10/02; (IPC1-7): C08F4/647
Attorney, Agent or Firm:
Heiyoshi Odashima