Process for preparing catalyst for olefin polymerization

Abstract

Disclosed is a process for preparing a catalyst for polymerizing a mono olefin having 6 through 20 carbon atoms comprising mixing (a) a fatty acid having not less than 3 carbon atoms and (b) aluminum chloride, aluminum bromide or a mixture thereof in an amount of 0.7 through 1.2 mol of the component .[.(b).]. .Iadd.(a) (i.e. aliphatic carboxylic acid) .Iaddend.based upon 1 mol of the component .[.(a).]. .Iadd.(b) (i.e. aluminum chloride, aluminum bromide or a mixture thereof), .Iaddend.to effect the condensation reaction of both components and a catalyst prepared by said process. This catalyst is suitable for use in the production of an olefin polymer having low viscosity and a high viscosity index.

What we claim is: 
     
       1. A process for preparing a catalyst for polymerization of a mono olefin having 6 through 20 carbon atoms comprising condensing: (a) an aliphatic carboxylic acid having 3 to 12 carbon atoms and, (b) aluminum chloride, aluminum bromide or a mixture thereof, in an amount of 0.7 through 1.2 mol of the component .[.(b).]. .Iadd.(a) .Iaddend.based upon 1 mol of the component .[.(a).]. .Iadd.(b) .Iaddend.at a temperature within the range of from 30° to 150° C. 
     
     
       2. The process as claimed in claim 1, wherein said condensing is carried out for 1 to 3 hours. 
     
     
       3. The process as claimed in claim 1, wherein said aliphatic carboxylic acid is at least one compound selected from the group consisting of propionic acid, n-butyric acid, iso-butyric acid, trimethyl acetic acid, n-valeric acid, iso-valeric acid, caproic acid, enanthic acid, caprilic acid, 2-ethyl hexanoic acid, capric acid and lauric acid. 
     
     
       4. The process as claimed in claim 1, wherein said amount of the component .[.(b).]. .Iadd.(a) .Iaddend.is within the range of from 0.8 to 1.1 mol based upon 1 mol of the component .[.(a).]. .Iadd.(b).Iaddend.. 
     
     
       5. The process as claimed in claim 1, wherein said mono olefin is at least one compound selected from the group consisting of hexene-1, octene-1, decene-1, 2-ethyloctene-1, tridecene-1 and octadecene-1. 
     
     
       6. A catalyst for polymerization of mono olefin having 6 through 20 carbon atoms prepared by condensing: (a) an aliphatic carboxylic acid having 3 to 12 carbon atoms and (b) aluminum chloride, aluminum bromide or a mixture thereof, in an amount of 0.7 through 1.2 mol of the component .[.(b).]. .Iadd.(a) .Iaddend.based upon 1 mol of the component .[.(a).]. .Iadd.(b).Iaddend., at a temperature within the range of from 30° to 150° C. 
     
     
       7. The catalyst as claimed in claim 6, wherein said condensing is carried out for 1 to 3 hours.