Appeal No. 1997-4099
Application No. 08/345,343
BACKGROUND
The invention is directed to a method for producing a polyolefin in the presence of a
catalyst comprising an organometallic compound and a transition metal compound. The
catalyst is formed by the reaction product of (i) at least one member selected from the
group consisting of metal magnesium and a hydroxylated organic compound, and oxygen-
containing organic compounds of magnesium; (ii) at least one oxygen-containing organic
compound of titanium; (iii) at least one silicon compound; components (i)-(iii) are first
reacted with (iv) at least one organoaluminum halide compound of the formula AlR5zX3-z;
and then with (iv') at least one organoaluminum halide compound different from (iv); adding
thereto (v) at least one organometallic compounds of metals of Groups Ia, IIa, IIb, IIIb, and
IVb of the Periodic Table; and (vi) absorbing at least one "-olefin in the reaction product of
(i)-(v) in an amount of 0.001 to 20 parts by weight per part by weight of said reaction
product of (i)-(v). The polyolefins produced by the claimed method are said to provide
polymers with excellent powder properties. (Brief, page 6, last paragraph). Claim 12
which is representative of the claimed subject matter is attached as an appendix to this
decision.
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