C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
252/100, 402/634
C08F 4/78 (2006.01) C08F 2/00 (2006.01) C08F 10/00 (2006.01)
Patent
CA 1165950
Abstract of the Disclosure In accordance with one embodiment of this invention, a zerovalent chromium compound is introduced onto an activated phosphate- containing support and utilized in conjunction with an organometal cocatalyst, such as a trialkylborane. In accordance with another embodiment of this invention, a phosphate-containing zerogel is formed by removing water from an aluminum phosphate-containing hydrogel by means of azeotropic distillation or washing with a volatile, water miscible organic compound, activated and thereafter zerovalent chromium is incorporated therewith. In other embodiments of this invention, a phosphate-containing support is formed by forming aluminum phosphate from an aluminum alkoxide or from a melt, or by phosphating silica or alumina, or by forming an aluminum phosphate/silica combination. A support thus formed is activated and a zerovalent chromium compound added. The resulting catalysts are capable of giving high melt index, broad molecular weight distribution polymer, which polymer also exhibits other deviations from typical olefin polymers including lower flexural modulus The catalyst is ideally suited for forming olefin polymers such-as ethylene and ethylene copolymers in a slurry system.
388746
Johnson Marvin M.
Mcdaniel Max P.
Osler Hoskin & Harcourt Llp
Phillips Petroleum Company
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