Boron-containing compound, its polymer, catalyst comprising the polymer and metallocene compound, and process for producing polyolefin

Claim 2

A boron-containing compound according to claim 1, wherein R¹, R² and R³ represent a pentafluorophenyl group, R³, R⁴ and R⁵ represent a hydrogen atom, Y is a phenylene group, and i is 1.

Claim 3

A boron-containing polymer comprising recurring units represented by the following formula (3): and optional recurring units represented by the following formula (4): wherein B, C, R¹, R², R³, R⁴, R⁵, R⁶, Y, X⁺ and i are as defined in claim 1, and R⁷ represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, an alkenyl group having 1 to 20 carbon atoms, an aryl or halogen-containing aryl group having 6 to 20 carbon atoms, an alkylaryl group having 7 to 20 carbon atoms, an arylalkenyl group having 8 to 20 carbon atoms, an alkylsilyl group having 1 to 20 carbon atoms, an arylsilyl group having 6 to 20 carbon atoms or an alkoxysilyl group having 1 to 20 carbon atoms; said polymer being prepared by polymerization of a monomer represented by the following formula (1): or by copolymerization of the monomer of formula (1) with a monomer represented by the following formula (2): wherein B, C, R¹, R², R³, R⁴, R⁵, R⁶, Y, X⁺, R⁷ and i are as defined above.

Claim 4

A boron-containing polymer according to claim 3 wherein R¹, R² and R³ represent a pentafluorophenyl group, R⁴, R⁵ and R⁶ represent a hydrogen atom, Y is a phenylene group, i is 1, and R⁷ is a phenyl group or a pentafluorophenyl group.

Claim 5

A boron-containing polymer according to claim 3 or 4, which comprises 5 to 100% by mole of recurring units of formula (3) and 95 to 0% by mole of recurring units of formula (4).

Claim 6

A boron-containing polymer according to any of claims 3 to 5, which has a weight average molecular weight (Mw) of 1,000 to 1000,000 as expressed in terms of polystyrene as measured by gel permeation chromatography.

Claim 7

A catalyst system for polymerization of an olefin which comprises (a) a boron-containing polymer as claimed in any of claims 3 to 6, and (b) a metallocene compound selected from those which are represented by the following formulae (5) and (6): [(η₅-C₅R⁸ h ) p R¹⁰ s (η₅-C₅R⁹ j )]MeQ 3-p (5) [(R⁹N) p R¹⁰ s (η₅-C₅R⁸ h )]MeQ' 3-p (6) wherein N is a nitrogen atom, Me is a transition metal selected from those which are recited in groups 4 and 5 of the periodic table, (η₅-C₅R⁸ h ) p and (η₅-C₅R⁹ j ) are a cyclopentadienyl ring or a substituted cyclopentadienyl ring, where h and j are an integer of 2 to 5, and R⁸s and R⁹s independently represent a hydrogen atom, an alkyl or alkenyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an alkylaryl or arylalkyl group having 7 to 20 carbon atoms or an alkylsilyl or silylalkyl group having 1 to 20 carbon atoms, or two adjacent R⁸s or R⁹s may form a ring together with the two adjacent carbon atoms in the substituted cyclopentadienyl ring, R¹⁰ is a binding group selected from the group consisting of an alkylene group having 1 to 4 carbon atoms, a dialkylgermylene group having 1 to 4 carbon atoms in each alkyl group, and an alkylsilylene group having 1 to 4 carbon atoms; said binding group having a function of binding the (η₅-C₅R⁸ h ) p ring with the (η₅-C₅R⁹ j ) ring in the metallocene compound of formula (5) or binding the (η₅-C₅R⁸ h ) p ring with the (R⁹N) p in the metallocene compound of formula (6), Q and Q' are a hydrogen atom, a halogen atom a hydrocarbon group having 1 to 20 carbon atoms, s is 0 or 1, p is 0 or 1, provided that, when s is 0, p is 0, and each of h and j is 4 when s is 1, and 5 when s is 0.

Claim 8

A process for producing a polyolefin which comprises polymerizing an olefin having 2 to 20 carbon atoms in the presence of a catalyst system as claimed in claim 7.