Claims
- 1. A method for producing a polyolefin in the presence of a catalyst comprising a transition metal compound and an organometallic compound, which comprises polymerizing at least one α-olefin in the presence of a catalyst system comprising:(A) a solid catalyst component prepared by reacting a homogenous solution consisting 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 and (iii) at least one silicon compound, first with (iv) at least one first organoaluminum halide compound of the formula: AlR5zX3−z wherein R5 is a hydrocarbon group having from 1 to 20 carbon atoms, X is a halogen atom, and 1≦z≦2, and wherein the atomic ratio of gram atoms of Al in the component (iv) to gram atoms of Mg in the component (i) (Al/Mg) is from 0.1 to 2.5 to precipitate crystalline nuclei, and then with (iv′) at least one second organoaluminum halide compound different from (iv) of the formula: AlR5zX3−z wherein R5 and X are the same as defined above, and 0<z<2, and wherein the atomic ratio of gram atoms of Al in the component (iv′) to gram atoms of Mg in the component (i) is from 0.5 to 20 to effect growth of the crystalline nuclei precipitated in (iv), adding thereto (v) at least one member selected from the group consisting of organometallic compounds of metals of Groups Ia, IIa, IIb, IIIb, and IVb of the Periodic Table, and (vi) absorbing at least one α-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), and (B) an additional amount of at least one member selected from the group consisting of organometallic compounds of metals of Groups Ia, IIa, IIb, IIIb and IVb of the Periodic Table.
- 2. The method according to claim 1, wherein the reactant (i) is a combination of metal magnesium and at least one hydroxylated organic compound selected from the group consisting of alcohols, organic silanols and phenols.
- 3. The method according to claim 1, wherein the reactant (i) is at least one member selected from the group consisting of magnesium alkoxides, magnesium alkyl alkoxides, magnesium hydroalkoxides, magnesium phenoxides, magnesium carboxylates, magnesium oxymates, magnesium hydroxamate salts, magnesium hydroxylamine salts, magnesium enolates, magnesium silanolates and complex alkoxides of magnesium with other metals.
- 4. The method according to claim 1, wherein the reactant (i) is a compound of the formula [TiOa(OR1)b]m wherein R1 is a hydrocarbon group having from 1 to 20 carbon atoms, a and b are such that a≧0 and b>0 and they are numbers agreeable with the valence of titanium, and m is an integer.
- 5. The method according to claim 1, wherein the reactant (iii) is a polysiloxane having repeating units of the formula —(Si(R2)(R3)—O—)p— wherein each of R2 and R3 which may be the same or different, is a hydrocarbon group having from 1 to 12 carbon atoms, hydrogen, a halogen, or an alkoxy group, an aryloxy group or a fatty acid residue, having from 1 to 12 carbon atoms, and p is an integer of from 2 to 10,000, provided that R2 and R3 are not simultaneously hydrogen or a halogen.
- 6. The method according to claim 1, wherein the reactant (iii) is a silane of the formula HqSirR4sXt wherein R4 is a hydrocarbon group having from 1 to 12 carbon atoms, or an alkoxy group, an aryloxy group or a fatty acid residue, having from 1 to 12 carbon atoms, X is a halogen, each of q, s and t is an integer of 0 or more, r is a natural number, and q+s+t=2r+2 or 2r.
- 7. The method according to claim 1, wherein the reactant (v) is an organometallic compound comprising a metal selected from the group consisting of lithium, magnesium, zinc, tin and aluminum, and a linear or branched alkyl group having from 1 to 20 carbon atoms.
- 8. The method according to claim 1, wherein the reactant (v) is at least one compound selected from the group consisting of n-butyllithium, diethylmagnesium, diethylzinc, trimethylaluminum, triethylaluminum, tri-i-butylaluminum, tri-n-butylaluminum, tri-n-decylaluminum, tetraethyltin and tetrabutyltin.
- 9. The method according to claim 1, wherein at least one α-olefin is absorbed in the reaction product of (i)-(v) in an amount of 0.01 to 10 parts by weight per part by weight of said reaction product of (i)-(v).
Priority Claims (1)
Number |
Date |
Country |
Kind |
3-187083 |
Jul 1991 |
JP |
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Parent Case Info
This application is a continuation of application Ser. No. 08/161,453, filed on Dec. 6, 1993, now abandoned, which is a continuation of application Ser. No. 07/907,633, filed Jul. 2, 1992, abandoned.
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Continuations (2)
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Number |
Date |
Country |
Parent |
08/161453 |
Dec 1993 |
US |
Child |
08/345343 |
|
US |
Parent |
07/907633 |
Jul 1992 |
US |
Child |
08/161453 |
|
US |