Catalyst system for the polymerization of olefins

Claim 2

An organometallic compound obtained by contacting a) a compound having following formula (I): wherein R a , R b , R c and R d , equal to or different from each other, are selected from the group consisting of hydrogen, halogen, linear or branched, saturated or unsaturated, C 1 -C 10 alkyl, C 6 -C 20 aryl, C 7 -C 20 arylalkyl and C 7 -C 20 alkylaryl groups, optionally containing O, S, N, P, Si or halogen atoms, or two or more adjacent substituents R a , R b , R c and R d form one or more C 4 -C 7 rings, optionally containing O, S, N, P or Si atoms, that can bear substituents; with b) a Lewis acid of formula (II) MtR 1 3 (II) wherein Mt is a metal belonging to Group 13 of the Periodic Table of the Elements; R 1 , equal to or different from each other, are selected from the group consisting of halogen, halogenated C 6 -C 20 aryl and halogenated C 7 -C 20 alkylaryl groups; two R 1 groups optionally form with the metal Mt one condensed ring.

Claim 3

The organometallic compound according to claim 1 wherein Mt is B or Al; the substituents R 1 are selected from the group consisting of fluoro, C 6 F 5 , C 6 F 4 H, C 6 F 3 H 2 , C 6 H 3 (CF 3 ) 2 , perfluoro-biphenyl, heptafluoro-naphthyl, hexafluoro-naphthyl and pentafluoro-naphthyl.

Claim 4

The organometallic compound according to claim 1 , having formula (III) wherein Mt is a metal belonging to Group 13 of the Periodic Table of the Elements; R 1 , equal to or different from each other, are selected from the group consisting of halogen, halogenated C 6 -C 20 aryl and halogenated C 7 -C 20 alkylaryl groups; two R 1 groups optionally form with the metal Mt one condensed ring; and the substituents R 5 , R 4 , R 3 and R 2 , equal to or different from each other, are selected from the group consisting of hydrogen, halogen, linear or branched, saturated or unsaturated, C 1 -C 10 alkyl, C 6 -C 20 aryl, C 7 -C 20 arylalkyl and C 7 -C 20 alkylaryl groups, optionally containing O, S, N, P, Si or halogen atoms, or two or more adjacent substituents R 2 -R 5 form one or more C 4 -C 7 rings, optionally containing O, S, N, P or Si atoms; with the proviso that at least one of the substituents R 5 , R 4 , R 3 and R 2 is different from hydrogen.

Claim 5

The organometallic compound according to claim 3 , wherein Mt is B or Al; the substituents R 1 equal to or different from each other, are selected from the group consisting of fluoro, C 6 F 5 , C 6 F 4 H, C 6 F 3 H 2 , C 6 H 3 (CF 3 ) 2 , perfluoro-biphenyl, heptafluoro-naphthyl, hexafluoro-naphthyl and pentafluoro-naphthyl; at least one of the substituents R 5 and R 4 is a C 6 -C 20 aryl, C 7 -C 20 arylalkyl or C 7 -C 20 alkylaryl groups, optionally containing O, S, N, P, Si or halogen atoms, or together R 5 and R 4 form an aromatic C 5 -C 7 ring optionally containing O, S, N, P or Si atoms, that can bear substituents.

Claim 6

The organometallic compound according to claim 3 , having formula (V): wherein B is a boron atom; the substituents R 1 , R 3 and R 2 have the meaning reported in claim 3 and the substituents R 6 , the same or different from each other, are selected from the group consisting of hydrogen, halogen, linear or branched, saturated or unsaturated, C 1 -C 10 alkyl, C 6 -C 20 aryl, C 7 -C 20 arylalkyl and C 7 -C 20 alkylaryl groups optionally containing O, S, N, P, Si or halogen atoms, or two or more adjacent substituents R 6 form one or more C 4 -C 7 rings, optionally containing O, S, N, P or Si atoms, that can bear substituents.

Claim 7

The organometallic compound according to claim 3 , having formula (VI): wherein the substituent R 1 have the meaning reported in claim 3 and the substituents R 6 , the same or different from each other, are selected from the group consisting of hydrogen, halogen, linear or branched, saturated or unsaturated, C 1 -C 10 alkyl, C 6 -C 20 aryl, C 7 -C 20 arylalkyl and C 7 -C 20 alkylaryl groups optionally containing O, S, N, P, Si or halogen atoms, or two or more adjacent substituents R 6 form one or more C 4 -C 7 rings, optionally containing O, S, N, P or Si atoms, that can bear substituents.

Claim 8

The organometallic compound according to claim 1 , having formula (IV): wherein Mt and R 1 have the meanings reported in claim 1 ; the substituents R 2′ , R 3′ , R 4′ and R 5′ , equal to or different from each other, are selected from the group consisting of hydrogen, halogen, linear or branched, saturated or unsaturated, C 1 -C 10 alkyl, C 6 -C 20 aryl, C 7 -C 20 arylalkyl and C 7 -C 20 alkylaryl groups, optionally containing O, S, N, P, Si or halogen atoms, or two or more adjacent substituents R 2′ , R 3′ , R 4′ and R 5′ form one or more C 4 -C 7 rings optionally containing O, S, N, P or Si atoms, that can bear substituents; said rings are aliphatic and optionally contain double bonds, with the proviso that said rings are not aromatic.

Claim 9

The organometallic compound according to claim 7 , wherein the substituents R 2′ , R 3′ , R 4′ and R 5′ , equal to or different from each other, are selected from the group consisting of hydrogen, linear or branched, saturated or unsaturated, C 1 -C 10 alkyl, optionally containing O, S, N, P or Si atoms, or two or more adjacent substituents R 2′ , R 3′ , R 4′ and R 5′ form one or more C 4 -C 7 rings optionally containing O, S, N, P or Si atoms, that can bear substituents; said rings are aliphatic and optionally contains double bonds, with the proviso that said rings are not aromatic.

Claim 10

The organometallic compound according to claim 8 , having formula (VII): wherein the substituents R 1 have the meaning described in claim 1 and the substituents R 2′ and R 5′ , equal to or different from each other, are C 1 -C 20 alkyl.

Claim 11

A process for preparing the organometallic compounds according to claim 1 comprising the step of reacting, about in stoichiometric amounts, a compound having the formula (I): with a Lewis acid of formula (II) MtR 1 3 (II).