Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
97 words
A process for polymerizing olefins, which comprises polymerizing or copolymerizing olefins in the presence of a catalyst composed of (A)' a compound of a transition metal of Group IV of the periodic table containing a ligand having a conjugated π-electron and a ligand containing a hetero atom capable of being bonded to the transition metal and selected from oxygen, sulfur, nitrogen and phosphorus, (B) an aluminoxane, and (C) an organoaluminium compound having a hydrocarbon group other than n-alkyl groups, the concentration of the aluminoxane in the reaction system being not more than 3 milligram-atoms/liter as aluminium atoms.
Claim 2
Dependent Claim
15 words
A process according to claim 1 wherein the transition metal is titanium, zirconium or hafnium.
Claim 3
Dependent Claim
116 words
A process according to claim 2 wherein the transition metal compound is represented by formula (I)' R 11 k R 12 ℓ R 13 m R 14 n Me (I)' wherein R¹¹ is cycloalkadienyl, R¹² is selected from the class consisting of -OR a , -SR b , -NR c 2 and -PR d 2 , R¹³ and R¹⁴, independently from each other, represent cycloalkadienyl, aryl, aralkyl, alkyl, halogen or hydrogen, R a , R b and R c represent alkyl, cycloalkyl, aryl, aralkyl or organic silyl, Me is zirconium, titanium or hafnium, k and l are 1, 2 or 3, m and n are 0, 1 or 2 and k+l+m+n=4 .
Claim 4
Dependent Claim
56 words
A process according to any one of the preceding claims wherein the aluminoxane is represented by formula (II) wherein R is a hydrocarbon group, X is a halogen atom, and a and b , independently from each other, represent a number from 0 to 80 with the proviso that a and b are not simultaneously zero.
Claim 5
Dependent Claim
32 words
A process according to any one of the preceding claims wherein a or the organic group of the organoaluminium compound is a branched alkyl group, a cycloalkyl group or an aryl group.
Claim 6
Dependent Claim
21 words
A process according to any one of the preceding claims wherein the transition metal compound is treated with an organometallic compound.
Claim 7
Dependent Claim
27 words
A process according to claim 6 wherein the organometallic compound is an organoaluminium compound, an organoboron compound, an organomagnesium compound, an organozinc compound or an organolithium compound.
Claim 8
Dependent Claim
29 words
A process according to any one of the preceding claims wherein the concentration of the aluminoxane is from 0.1 to 2.5 milligram-atoms/liter as aluminium atoms in the reaction system.