Abstract A process for polymerizing Alpha -olefins in the presence of a Ziegler catalyst, such catalyst comprising (i) a pulverulent catalyst component obtained by mechanically or physically copulverizing a halogen compound of low valency titanium obtained by reducing titanium tetrahalide with a member selected from the group consisting of hydrogen, metallic aluminum and metallic titanium, an oxide selected from the group consisting of (a) an oxide selected from the group consisting of MgO, Al2O3 and SiO2 and (b) a compound oxide containing at least two elements selected from the group consisting of Mg, Al and Si, in an inert atmosphere in the solid phase until the average particle size of the pulverized product reaches 5 microns or less; and (ii) an organoaluminum or organozinc compound.
The process of claim 1, wherein said oxide has been pre-treated by contact with a compound selected from the group consisting of trialkyl aluminums having an alkyl group with one to six carbon atoms, dialkyl aluminum halides having an alkyl group with one to six carbon atoms, alkyl aluminum dihalides having an alkyl group with one to six carbon atoms, alkyl aluminum sesquihalides having an alkyl group with one to six carbon atoms, and dialkylzincs having an alkyl group with one to four carbon atoms.
Claim 2
Dependent Claim
27 words
The process of claim 1, wherein said Alpha -olefin having three to eight carbon atoms is selected from the group consisting of propylene, 1-butene, 4-methyl-1-pentene and 1-hexene.
Claim 3
Dependent Claim
23 words
The process of claim 1, wherein the polymerization or copolymerization is carried out at a temperature in the Range of 20* to 250*C.
Claim 4
Dependent Claim
23 words
The process of claim 1, wherein the polymerization or copolymerization is carried out at a pressure ranging from atmospheric pressure to 100 Kg/cm2-g.
Claim 5
Dependent Claim
31 words
The process of claim 1, wherein the amount of said pulverulent component is in the range of 0.005 to 10 g per liter of said inert solvent or liquid Alpha -olefin.
Claim 6
Dependent Claim
34 words
The process of claim 1, wherein the amount of the organometallic component of the catalyst is in the range of 0.01 to 50 millimols per liter of said inert solvent or liquid Alpha -olefin.
Claim 7
Dependent Claim
25 words
The process of claim 1, wherein at least 80 percent of the pulverized particles have diameters within the range of 5 to 0.1 Mu .