Process for activating catalyst for polymerization of propylene before polymerization

Claim 1

The method which comprises (I) forming a delta-type titanium trichloride composition by (A) reacting a beta-type titanium trichloride containing AlCl 3 , with (B) a complexing agent selected from the group consisting of (1) a dialkyl ether represented by the general formula R--O--R' wherein R and R' are each an alkyl group having 1 - 10 carbon atoms, (2) a polyethylene glycol diakylether represented by the general formula R--O--(CH 2 CH 2 O) n --R' wherein R and R' are each an alkyl group having 1 - 4 carbon atoms, and n is an integer of 1 - 4, (3) a dialkyl thioether represented by the general formula R--S--R' wherein R and R' are each an alkyl having 1 - 10 carbon atoms, (4) an alicylcic organic ether represented by the general formula ##STR2## where n is an integer of 3-5, or (5) an organic ester represented by the general formula RCOOR', wherein R and R' are each alkyl having 1 - 10 carbon atoms, or (C) a complex compound consisting of said complexing agent and titanium tetrachloride, and (D) grinding the resulting deltatype titanium chloride composition, (II) forming a catalyst dispersion by mixing said ground delta-type titanium trichloride composition with an alkyl aluminum chloride having the general formula R n AlCl 3-n , wherein R is an alkyl having 1 - 4 carbon atoms and n is an integer of 1 - 2, (III) activating said catalyst dispersion for the polymerization of propylene in advance of the polymerization which comprises contacting said catalyst dispersion, in an inert solvent, with propylene containing 1% or less by volume of hydrogen while said catalyst dispersion is maintained at 10° - 50° C, said propylene being fed into contact with said catalyst dispersion at a rate of 0.02 - 1.0 parts by weight per hour per part of delta-type -titanium trichloride composition and to such an extent that the amount of absorbed propylene is 0.5 - 5 times the weight of said delta-type titanium trichloride solution.

Claim 2

The method which comprises (I) forming a delta-type titanium trichloride composition by (A) reacting a beta-type titanium trichloride containing AlCl 3 , with (B) a complexing agent selected from the group consisting of (1) a dialkyl ether represented by the general formula R--O--R' wherein R and R' are each an alkyl group having 1 - 10 carbon atoms, (2) a polyethylene glycol diakylether represented by the general formula R--O--(CH 2 CH 2 O) n --R' wherein R and R' are each an alkyl group having 1 - 4 carbon atoms, and n is an integer of 1 - 4, (3) a dialkyl thioether represented by the general formula R--S--R' wherein R and R' are each an alkyl having 1 - 10 carbon atoms, (4) an alicylcic organic ether represented by the general formula ##STR2## where n is an integer of 3-5, or (5) an organic ester represented by the general formula RCOOR', wherein R and R' are each alkyl having 1 - 10 carbon atoms, or (C) a complex compound consisting of said complexing agent and titanium tetrachloride, and (D) grinding the resulting deltatype titanium chloride composition, (II) forming a catalyst dispersion by mixing said ground delta-type titanium trichloride composition with an alkyl aluminum chloride having the general formula R n AlCl 3-n , wherein R is an alkyl having 1 - 4 carbon atoms and n is an integer of 1 - 2, (III) activating said catalyst dispersion for the polymerization of propylene in advance of the polymerization which comprises contacting said catalyst dispersion, in an inert solvent, with propylene containing 1% or less by volume of hydrogen while said catalyst dispersion is maintained at 10° - 50° C, said propylene being fed into contact with said catalyst dispersion at a rate of 0.02 - 1.0 parts by weight per hour per part of delta-type -titanium trichloride composition and to such an extent that the amount of absorbed propylene is 0.5 - 5 times the weight of said delta-type titanium trichloride solution.