Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
188 words
A process for preparing an alpha-olefin polymer which comprises (i) pre-polymerizing at least one alpha-olefin in the presence of a solid catalyst comprising (A) a solid catalyst component composed of a transition metal compound of the formula (I) R 1 k R 2 ℓ R 3 m R 4 n Me (I) wherein R¹ represents a cycloalkadienyl group, R², R³ and R⁴ are identical or different and each represents a cycloalkadienyl group, an aryl group, an alkyl group, a cycloalkyl group, an aralkyl group, a halogen atom, a hydrogen atom, or a group of the formula -OR a , -SR b or -NR c 2 in which each of R a , R b and R c represents an alkyl group, a cycloalkyl group, an aryl group, an aralkyl group or an organic silyl group, Me represents zirconium, titanium or hafnium, k is 1, 2, 3 or 4, ℓ, m and n are each 0, 1, 2 or 3 and k+ℓ+m+n=4 supported on a carrier, and (B) an aluminoxane, and then (ii) homopolymerizing or copolymerizing an alpha-olefin in the presence of the solid catalyst resulting from step (i).
Claim 2
Dependent Claim
66 words
A process according to claim 1 wherein the aluminoxane (B) is of formula (II) wherein R is a hydrocarbon group, X is a halogen atom, and a and b, independently from each other, are numbers of 0 to 80 provided that a and b are not both zero, or of formula (III) wherein R, X, a and b are as defined with regard to formula (II).
Claim 3
Dependent Claim
26 words
A process according to claim 1 or 2 wherein the carrier is treated with an organometallic compound before the transition metal compound is supported on it.
Claim 4
Dependent Claim
27 words
A process according to claim 3 wherein the organometallic compound is an organoaluminum compound, an organoboron compound, an organomagnesium compound, an organozinc compound or an organolithium compound.
Claim 5
Dependent Claim
18 words
A process according to any one of the preceding claims wherein the carrier is a porous inorganic oxide.
Claim 6
Dependent Claim
67 words
A process for preparing an alpha-olefin polymer which comprises homopolymerizing or copolymerizing an alpha-olefin in the presence of a catalyst comprising (A) a solid catalyst component obtainable by supporting a compound of a transition metal compound of the formula (I) as defined in claim 1 on a porous inorganic oxide treated with a compound selected from organometallic compounds, halogen-containing silicon compounds and aluminoxanes, and (B) an aluminoxane.
Claim 7
Dependent Claim
38 words
A process according to claim 6 wherein the compound for treating the carrier is an organometallic compound, and the organometallic compound is an organoaluminum compound, an organoboron compound, an organomagnesium compound, an organozinc compound or an organolithium compound.
Claim 8
Dependent Claim
104 words
A process according to claim 6 wherein the compound for treating the carrier is a halogen-containing silicon compound of formula (IV) SiY d R 5 e (OR⁶) 4-d-e (IV) wherein Y is a chlorine or bromine atom, R⁵ and R⁶, independently from each other, represent a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, an aryl group, or a cycloalkyl group having 3 to 12 carbon atoms, d is a number of 1 to 4, and e is a number of 0 to 4 with the proviso that the total of d and e is a number of 1 to 4.
Claim 9
Dependent Claim
26 words
A process according to claim 6 wherein the compound for treating the carrier is an aluminoxane of formula (II) or (III) as defined in claim 2.
Claim 10
Dependent Claim
26 words
A process according to any one of claims 6 to 9 wherein the aluminoxane (B) is of formula (II) or (III) as defined in claim 2.
Claim 11
Dependent Claim
19 words
A process according to any one of the preceding claims wherein the alpha-olefin has 2 to 20 carbon atoms.
Claim 12
Dependent Claim
23 words
A process according to claim 11 wherein the alpha-olefin is a mixture of ethylene and an alpha-olefin having 3 to 20 carbon atoms.